Note: Descriptions are shown in the official language in which they were submitted.
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1
SECONDARY ALKYL SULFATE SURFACTANT WITH
IMPROVED SOLUBILITY BY KNEADING/EXTRUDING PROCESS
FIELD OF THE INVENTION
Secondary alkyl sulfate (SAS) surfactants are processed using various
ingredients to provide improved water solubility. The resulting SAS particles
are
useful in laundry detergents and other cleaning compositions, especially under
cold
water washing conditions.
BACKGROUND OF THE INVENTION
Most conventional detergent compositions contain mixtures of various
detersive surfactants in order to remove a wide variety of soils and stains
from
surfaces. For example, various anionic surfactants, especially the alkyl
benzene
sulfonates, are useful for removing particulate soils, and various nonionic
surfactants,
such as the alkyl ethoxylates and alkylphenol ethoxylates, are useful for
removing
greasy soils. While a review of the literature would seem to suggest that a
wide
selection of surfactants is available to the detergent manufacturer, the
reality is that
many such materials are specialty chemicals which are not suitable for routine
use in
low unit cost items such as home laundering compositions. The fact remains
that
many home-use laundry detergents still comprise one or more of the
conventional
alkyl benzene sulfonate or primary alkyl sulfate surfactants.
One class of surfactants which has found limited use in various compositions
where emulsification is desired comprises the secondary alkyl sulfates. The
conventional secondary alkyl sulfates are available as generally pasty, random
mixtures of sulfated linear and/or partially branched aikanes. Such materials
have not
come into widespread use in laundry detergents, since they offer no particular
advantages over the alkyl benzene sulfonates.
Modern granular laundry detergents are being formulated in "condensed" form
which offers substantial advantages, both to the consumer and to the
manufacturer.
For the consumer, the smaller package size attendant with condensed products
provides ease-of handling and storage. For the manufacturer, unit storage
costs,
shipping costs and packaging costs are lowered.
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The manufacture of acceptable condensed granular detergents is not without
its difficulties. In a typical condensed formulation, the so-called "inert"
ingredients
such as sodium sulfate are mainly deleted. However, such ingredients do play a
role
in enhancing the solubility of conventional spray-dried detergent; hence, the
S condensed form will often suffer from solubility problems. Moreover,
conventional
low-density detergent granules are usually prepared by spray-drying processes
which
result in porous detergent particles that are quite amenable to being
solubilized in
aqueous laundry liquors. By contrast, condensed formulations will typically
comprise
substantially less porous, high density detergent particles which are less
amenable to
solubilization. Overall, since the condensed form of granular detergents
typically
comprises particles which contain high levels of detersive ingredients with
little room
for solubilizing agents, and since such particles are intentionally
manufactured at high
bulk densities, the net result can be a substantial problem with regard to in-
use
solubility.
IS It has now been discovered that a particular sub-set of the class of
secondary
alkyl sulfates, referred to herein as secondary (2,3) alkyl sulfates ("SAS"),
offers
considerable advantages to the formulator and user of detergent compositions.
For
example, the secondary (2,3) alkyl sulfates are available as dry, particulate
solids.
Accordingly, they prospectively can be formulated as high-surfactant (i.e.,
"high-
active") particles for use in granular laundry detergents. Since, with proper
care in
manufacturing, the secondary (2,3) alkyl sulfates are available in solid,
particulate
form, they can be dry-mixed into granular detergent compositions without the
need
for passage through spray drying towers. In addition to the foregoing
advantages
seen for the secondary (2,3) alkyl sulfates, it has now been determined that
they are
both aerobically and anaerobically degradable, which assists in their disposal
in the
environment. Desirably, the secondary (2,3) alkyl sulfates are quite
compatible with
detersive enzymes, especially in the presence of calcium ions.
Unfortunately, commercially available SAS particles are somewhat deficient
with regard to their rate of solubility in cooler aqueous wash liquors. This
problem is
especially acute in countries where consumers prefer cold washing
temperatures, i.e.,
as low as about 5°C. This problem is further exacerbated when SAS is
used in high
density detergent granules.
The present invention converts commercial SAS powder which has a
relatively slow dissolution rate into fast-dissolving detergent particles.
Importantly,
the SAS particles provided herein are free-flowing, and can be readily admixed
with
other ingredients to provide fully-formulated granular detergents.
Accordingly, the
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present invention overcomes many of the problems associated with the use of
SAS in
granular laundry detergents or other granular cleaning compositions.
BACKGROUND ART
Detergent compositions with various "secondary" and branched alkyl sulfates
are disclosed in various patents; see: U.S. 2,900,346, Fowkes et al, August
18,
1959; U.S. 3,234,258, Moms, February 8, 1966; U.S. 3,468,805, Grifo et al,
September 23, 1969; U.S. 3,480,556, DeWitt et al, November 25, 1969; U.S.
3,681,424, Bloch et al, August l, 1972; U.S. 4,052,342, Fernley et al, October
4,
1977; U.S. 4,079,020, Mills et al, March 14, 1978; U.S. 4,226,797, Bakker et
al.,
October 7, 1980; U.S. 4,235,752, Rossall et al, November 25, 1980; U.S.
4,317,938,
Lutz, March 2, 1982; U.S. 4,529,541, Wilms et al, July 16, 1985; U.S.
4,614,612,
Reilly et al, September 30, 1986; U.S. 4,880,569, Leng et al, November 14,
1989;
U.S. 5,075,041, Lutz, December 24, 1991; U.S. 5,349,101, Lutz et al.,
September
20, 1994; U.S. 5,389,277, Prieto, February 14, 1995; U.K. 818,367, Bataafsche
Petroleum, August 12, 1959; U.K. 858,500, Shell, January 11, 1961; U.K.
965,435,
Shell, July 29, 1964; U.K. 1,538,747, Shell, January 24, 1979; U.K. 1,546,127,
Shell,
May 16, 1979; U.K. 1,550,001, Shell, August 8, 1979; U.K. 1,585,030, Shell,
February 18, 1981; GB 2,179,054A, Leng et al, February 25, 1987 (referring to
GB
2,155,031). U.S. Patent 3,234,258, Moms, February 8, 1966, relates to the
sulfation
of alpha olefins using H2S04, an olefin reactant and a low boiling, nonionic,
organic
crystallization medium.
Various means and apparatus suitable for preparing high-density granules have
been disclosed in the literature and some have been used in the detergency
art. See,
for example: U.S. 5,133,924; EP-A-367,339; EP-A-390,251; EP-A-340,013; EP-A
327,963; EP-A-337,330; EP-B-229,671; EP-B2-191,396; JP-A-6,106,990; EP-A-
342,043; GB-B-2,221,695; EP-B-240,356; EP-B-242,138; EP-A-242,141; U.S.
4,846,409; EP-A-420,317; U.S. 2,306,698; EP-A-264,049; U.S. 4,238,199; DE
4,021,476.
See also: WO 94/24238; WO 94/24239; WO 94/24240; WO 94/24241; WO
94/24242; WO 94/24243; WO 94/24244; WO 94/24245; WO 94/24246; U.S.
5,478,500, Swift et al, December 26, 1995; U.S. 5, 478,502, Swift, December
26,
1995; U.S. 5, 478,503, December 26, 1995.
SUMMARY OF THE INVENTION
The present invention encompasses a process for preparing detergent
particles with improved solubility which contain a secondary (2,3) alkyl
sulfate
surfactant, comprising the steps of:
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(a) blending said secondary (2,3) alkyl sulfate in particulate form with
powdered
detersive ingredients selected from the group consisting of soap powder, dried
primary alkyl sulfate flake, sodium carbonate, and mixtures thereof to provide
a substantially homogeneous powder mixture containing at least about 10%,
by weight, of said secondary (2,3) alkyl sulfate;
(b) admixing the powder mixture of step (a) with a surfactant paste to provide
a
detergent dough;
(c) extruding the detergent dough of step (b) through an orifice to provide
detergent noodles (i.e.., extrudate) having a diameter in the range from about
100 1500 micrometers;
(d) cutting the noodles of step (c) to provide particles having a length in
the
preferred range from about 100 micrometers to about 15 cm;
(e) coating the particles of step (d) with a free-flow aid; and
(f) optionally, sizing the coated particles of step (e) to a mean particle
size in the
range from about 100 t~o about 2000 micrometers.
In a preferred process, the homogeneous powder mixture of step (a) comprises
from
about 10% to about 75%, by weight, of the secondary (2,3) alkyl sulfate
surfactant.
While various water-soluble materials can be used, in a typical process herein
the
detersive ingredient used in step (a) is preferably a member as set out above
but also suitable
are polyacrylate powder and acrylate/rnaleate copolymer powder.
In a preferred mode, the surfactant paste used in step (b) comprises water and
an
anionic surfactant, at a wateraurfactant weight ratio in the range from about
1:4 to about 1:9.
The detergent dough prepared in step (b) most preferably has a water content
of less than
about 10%, preferably less than about 4%, by weight.
The free-flow aid used in step (d) is preferably a member selected from the
group
consisting of finely powdered (O.S-10 micrometer) zeolite, finely powdered
silica, and
mixtures thereof. In a highly preferred mode, the free-flow aid is applied by
first coating the
particles of step (d) with a nonionic surfactant binder and, thereafter,
coating said particles
with said free-flow aid.
The preferred SAS-containing; particles of step (e) coated with the free-flow
aid
comprise from about 30% to about 50%, by weight, of total surfactant, a
density of at least
;bout 650 g/L and a mean particles size in the range from about 100 to about
1500
micrometers.
The invention also provides fully-formulated granular detergent compositions,
comprising conventional formulation ingredients and at least about 5%, by
weight, of the
particles prepared according to the process herein, more preferably from about
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5% to about 99%, by weight, of the particles prepared with the nonionic
surfactant
plus free-flow aid coating noted above.
All percentages, ratio > and proportions herein are by weight, unless
otherwise
specified.
5
DETAILED 1~ESCRTPTION OF THE INVENTION
The SAS surfactant and its processing in the manner of the present invention
are described in detail, hereinafter. Other ingredients which can be used to
prepare
fully-formulated detergent compositions are also disclosed for the convenience
of the
formulator, but are not intended to be limiting thereof.
Secondary f2.3) AJkvl Sulfate Surfactant
The soluble particles provided by the process herein preferably contain from
about IO% to about 70%, more preferably from about 20% to about 60%, and most
preferably from about 30% to about 50% of a secondary (2,3) alkyl sulfate
surfactant
as described herein. For the convenience of those skilled in the art, the
following
discussion of the secondary (2,3) alkyl sulfates used herein serves to
distinguish these
materials from conventional alkyl sulfate ("AS") surfactants.
The discovery that SAS powder can be processed by various grinding and
coating techniques is very surlprising and unexpected, and suggests that this
is unique
for SAS. SAS powder is highly crystalline, and thus very fiiable and easily
broken
into fine dust without undue stickiness/reagglomeration. Once treated in the
manner
of this invention, this fine dust of SAS can be dispersed in water to give
faster
dissolution due to the increased surface area.
In contrast, normal surfactants, due to impurities and chain length mixtures,
are not fiiable enough to be easily broken, and do not lend to such processing
methods. The conventional AS surfactants constitute one such example. Although
pure AS is highly crystalline, the commercial grade of AS is present as AS
crystals
dispersed in a waxy medium of impurities. Grinding is not possible at normal
temperatures. Since the AS crystals have larger particle sizes than the ground
SAS,
AS also does not disperse as well in water, and AS particles suffer from a
relatively
slower dissolution rate.
Conventional primary alkyl sulfate surfactants have the genera! formula
RO S03 -M+
wherein R is typically a linear C l0-C20 hydrocarbyl group and M is a water-
solubilizing cation. Branched-chain primary alkyl sulfate surfactants (i.e.,
branched-
chain "PAS") having 10-20 carbon atoms are also known; see, for example,
European Patent Application 439,316, Smith et al, filed 21.01.91.
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Conventional secondary allyl sulfate surfactants are those materials which
have the sulfate moiety distributed randomly along the hydrocarbyl "backbone"
of the
molecule. Such materials may be depicted by the structure
CH3(CH2)n(CHOS03-M+)(CH2)mCH3
wherein m and n are integers of 2 or greater and the sum of m + n is typically
about 9
to 17, and M is a water-solubiIizing cation.
By contrast with the above, the selected secondary (2,3) alkyl sulfate
surfactants used herein comprise structures of formulas A and B
(A) CH3(CH2)x(CHOS03-M+) CH3 and
(B) CH3(CH2)y(CHOS03-M+)CH2CH3
far the 2-sulfate and 3-sulfate, respectively. Mixtures of the 2- and 3-
sulfate can be
used herein. In formulas A and B, x and (y+1) are, respectively, integers of
at least
about 6, and can range from about 7 to about 20, preferably about 10 to about
16.
M is a cation, such as an alkali metal, ammonium, alkanolammonium, alkaline
earth
metal, or the like. Sodium is typical for use as M to prepare the water-
soluble
secondary (2,3) alkyl sulfates, but ethanolammonium, diethanolammonium,
triethanolammonium, potassium, ammonium, and the like, can also be used.
Materials A and B, and mixtures thereof, are abbreviated "SAS", herein.
By the present invention, it has been determined that the physical/chemical
properties of the foregoing types of alkyl sulfate surfactants are
unexpectedly
different, one from another, in several aspects which are important to
formulators of
various types of detergent compositions. For example, the primary alkyl
sulfates can
disadvantageously interact with, and even be precipitated by, metal cations
such as
calcium and magnesium. Thus, water hardness can negatively affect the primary
alkyl sulfates to a greater extent than SAS. Accordingly, the SAS has now been
found to be preferred for use in the presence of calcium ions and under
conditions of
high water hardness, or in the so-called "under-built" situation which can
occur when
nonphosphate builders are employed.
With regard to the random secondary alkyl sulfates (i.e., secondary alkyl
sulfates with the sulfate group at positions such as the 4, 5, 6, 7, etc.
secondary
carbon atoms), such materials tend to be tacky solids or, more generally,
pastes.
Thus, the random alkyl sulfates do not afford the processing advantages
associated
with the solid SAS when formulating detergent granules. Moreover, SAS provides
better sudsing than the random mixtures. It is preferred that SAS be
substantially
free (i.e., contain less than about 20%, more preferably less than about 10%,
most
preferably less than about S%) of such random secondary alkyl sulfates.
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One additional advantage of the SAS surfactants herein over other positional
or "random" alkyl sulfate isomers is in regard to the improved benefits
afforded by
said SAS with respect to soil redeposition in the context of fabric laundering
operations. As is well-known to users, laundry detergents loosen soils from
fabrics
being washed and suspend the soils in the aqueous laundry liquor. However, as
is
well-known to detergent formulators, some portion of the suspended soil can be
redeposited back onto the fabrics. Thus, some redistribution and redeposition
of the
soil onto all fabrics in the load being washed can occur. This, of course, is
undesirable and can lead to the phenomenon known as fabric "graying". (As a
simple
test of the redeposition characteristics of any given laundry detergent
formulation,
unsoiled white "tracer" cloths can be included with the soiled fabrics being
laundered.
At the end of the laundering operation the extent to which the white tracers
deviate
from their initial degree of whiteness can be measured photometrically or
estimated
visually by skilled observers. The more the tracers' whiteness is retained,
the less soil
redepositivn has occurred.)
It has also been determined that SAS affords substantial advantages in soil
redeposition characteristics over the other positional isomers of secondary
alkyl
sulfates in laundry detergents, as measured by the cloth tracer method noted
above.
Thus, the selection of SAS surfactants according to the practice of this
invention
which preferably are substantially free of other positional secondary isomers
unexpectedly assists in solving the problem of soil redeposition in a manner
not
heretofore recognized.
It is to be noted that the SAS used herein is quite different in several
important properties from the secondary olefin sulfonates (e.g., U.S. Patent
4,064,076, Klisch et al, 12/20,177); accordingly, such secondary sulfonates
are not the
focus of the present invention.
The preparation of SAS of the type useful herein can be carried out by the
addition of H2S04 to olefins. A typical synthesis using oc-olefins and
sulfuric acid is
disclosed in U.S. Patent 3,234,258, Morris, or in U.S. Patent 5,075,041, Lutz,
granted December 24, 1991. The synthesis, conducted in solvents
which afford the S.AS on cooling, yields products which,
when purified to remove the unreacted materials, randomly sulfated
materials, unsulfated by-products such as C 10 and higher alcohols, secondary
olefin
sulfonates, and the tike, are typically 90+% pure mixtures of 2- and 3-
sulfated
materials (up to 10% sodium sulfate is typically present) and are white, non-
tacky,
apparently crystalline, solids. Some 2,3-disulfates may also be present, but
generally
comprise no more than 5% of the mixture of secondary (2,3) alkyl mono-
sulfates.
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If still further increases in the solubility of the "crystalline" SAS
surfactants
are desired, the formulator may wish to employ mixtures of such surfactants
having a
mixture of alkyl chain lengths. Thus, a mixture of C 12-C 1 g alkyl chains
will provide
an increase in solubility over an SAS wherein the alkyl chain is, say,
entirely C 16.
S This additional increase in solubility is in addition to the increase
provided by the
processing aspects of the present invention.
When formulating detergent compositions using the soluble particles provided
by this invention, it may be desirable that the SAS surfactants contain less
than about
3% sodium sulfate, preferably less than about 1% sodium sulfate. In and of
itself,
sodium sulfate is an innocuous material. However, it provides no cleaning
fianction
in the compositions and may constitute a load on the system when dense
granules are
being formulated.
Various means can be used to lower the sodium sulfate content of the SAS.
For example, when the H~S04 addition to the olefin is completed, care can be
taken
to remove unreacted H2S04 before the acid form of the SAS is neutralized. In
another method, the sodium salt form of the SAS which contains sodium sulfate
can
be rinsed with water at a temperature near or below the Kraf$ temperature of
the
sodium SAS. This will remove Na2S04 with only minimal loss of the desired,
purified sodium SAS. Of course, both procedures can be used, the first as a
pre-
neutralization step and the second as a post-neutralization step.
The term "Krafl~ temperature" as used herein is a term of art which is well-
known to workers in the field of surfactant sciences. Krafft temperature is
described
by K. Shinoda in the text "Principles of Solution and Solubility", translation
in
collaboration with Paul Becher, published by Marcel Dekker, Inc. 1978 at pages
160-
161. Stated succinctly, the solubility of a surface active agent in water
increases
rather slowly with temperature up to that point, i.e., the Krai~ temperature,
at which
the solubility evidences an extremely rapid rise. At a temperature
approximately 4°C
above the Kraut temperature a solution of almost any composition becomes a
homogeneous phase. In general, the Kraft temperature of any given type of
surfactant, such as the SAS herein which comprises an anionic hydrophilic
sulfate
group and a hydrophobic hydrocarbyl group, will vary with the chain length of
the
hydrocarbyl group. This is due to the change in water solubility with the
variation in
the hydrophobic portion of the surfactant molecule.
The formulator may optionally wash the SAS surfactant which is
contaminated with sodium sulfate with water at a temperature that is no higher
than
the Krai~ temperature, and which is preferably lower than the Krafl~
temperature, for
the particular SAS being washed. This allows the sodium sulfate to be
dissolved and
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removed with the wash water, while keeping losses of the SAS into the wash
water
to a minimum.
Under circumstances where the SAS surfactant herein comprises a mixture of
alkyl chain lengths, it will be appreciated that the Kraffr temperature will
not be a
single point but, rather, will be denoted as a "Krafi3 boundary". Such matters
are
well-known to those skilled in the science of surfactant/solution
measurements. In
any event, for such mixtures of SAS, it is preferred to conduct the optional
sodium
sulfate removal operation at a temperature which is below the Krafft boundary,
and
preferably below the Kra~ temperature of the shortest chain-length surfactant
present in such mixtures, since this avoids excessive losses of SAS to the
wash
solution. For example, for C 16 secondary sodium alkyl (2,3) sulfate
surfactants, it is
preferred to conduct the washing operation at temperatures below about
30°C,
preferably below about 20°C. It will be appreciated that changes in the
canons will
change the preferred temperatures for washing the SAS surfactants, due to
changes
in the Kraffr temperature.
The washing process can be conducted batchwise by suspending wet or dry
SAS in sufficient water to provide 10-50% solids, typically for a mixing time
of at
least 10 minutes at about 22°C (for a C 16 SAS), followed by pressure
filtration. In a
preferred made, the slurry will comprise somewhat less than 35% solids,
inasmuch as
such slurries are free-flowing and amenable to agitation during the washing
process.
As an additional benefit, the washing process also reduces the levels of
organic
contaminants which comprise the random secondary alkyl sulfates noted above.
SAS Processing
On a pilot plant or commercial scale, the SAS particle manufacture in the
manner of this invention can be conducted using various pieces of commercial
equipment, including such items as rotary mixers, grinders, compactors, spray-
dry
equipment, kneaders, blenders, extruders, and the like, which are within the
scope of
conventional chemical engineering processes. The following illustrates a
preferred
process herein, but is not intended to limit the scope of the present
invention.
The following describes the process to produce high active surfactant particle
which contains SAS, using a pilot kneader, an extruder, and a Lodige mixer.
The
high dissolution of the SAS particle thus produced allows the incorporation of
higher
levels of surfactant into heavy duty granular detergents than otherwise
possible. An
important advantage of the present process is that it employs equipment and
ingredients which are otherwise well-known and conventional to those familiar
with
the manufacture of detergent compositions to provide SAS particles with
improved
solubility. For example, materials such as the polyacryiates or AS or SKS-6
silicate,
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etc., which are blended with SAS in Step (a) of the process are substantially
the same
as the materials listed herein as Formulation Ingredients. Accordingly, it is
to be
understood that such materials can be present both in the SAS particles and in
the
balance of the fully-formulated detergent compositions which contain the SAS
5 particles. The same is true for the various surfactants or surfactant
mixtures in the
surfactant paste used in Step (b), and for the zeolite, silica, etc., used in
the
subsequent steps of the process.
Step (a) - The purpose of this step is to prepare pre-mixed powder form
detergent compositions before mixing with surfactant pastes in a kneader. In
this
10 step, the SAS powder is well mixed in any type of mixer, e.g., a cement
mixer, with
other powdered form detergent ingredients, i. e., dried high active AS flake,
dried
polyacrylate powder, soap powder, light Na~C03, SKS-6 (silicate), and minor
level
ingredients at desired formulation levels. SKS-6 is pre-ground to reduce its
particle
size to 40 - 60 microns before mixing.
Step (b) - This step mixes the powder obtained from Step (a) and wet
surfactant paste having a moisture content of about 18-20%, e.g., oleoyl
sarcosinates, linear alkyl benzene sulfonate (LAS), alkyl glycerol sulfonate
(AGS),
etc. to provide an extrudable dough. The materials are charged into a batch
kneader,
which is a mixer that offers uniform dispersion and mixing with a short
processing
time, to produce plasticized wet dough for follow-up wet granulation
processing.
This step should be run until the detergent dough is formed. The ratio of wet
surfactant paste and SAS is about 70/30 in the kneader. The total moisture
content
of the detergent dough should be less than about 10%, and preferably less than
about
4%, by weight.
Step (c) - The purpose of this step is to make detergent "noodles" using an
extruder with the detergent dough obtained from Step (b). The detergent dough
is
charged into an extruder at a constant rate. The diameter of the detergent
noodle
should be around 100 - 150011m microns, which is determined by the orifice
size in
the extruder apparatus. The length of the noodle is cut to around 100pm - 15.0
cm,
depending on the detergent dough formulation and extruder operation
conditions.
Step (d) - The purpose of this step is to reduce the detergent noodle from
Step (c) to meet the desired target particle size of an admixable detergent
particle.
The noodles obtained from Step (c) is charged into a high speed mixer such as
a
Marumarizer manufactured by Fuji Powdal Co. until each noodle length is
shorten to
about 1-2 mm. Powdered form silica and/or zeolite can be added together with
noodles into the mixer in order to avoid over-agglomeration.
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11
Step (e) - The purpose of this step is to improve the free flowing property of
the cut noodles of Step (d) by coating their sticky surfaces with a nonionic
binder and
zeolite or powde,Mred silica. The noodles obtained from Step (c) are charged
into an
operating Lodige KM mixer. Hot nonionic binder is sprayed onto the noodle
during
mixing. Zeolite and/or powdered silica is then charged into the mixer until no
free
zeolite and/or powdered silica is observable with the naked eye.
Step (f) - The particles are then sieved through a screen. The final particle
has a total surfactant level of .around 40%, a bulk density of more than
650g/L, and a
mean particle size range of about 700-1000 micrometers.
The particles thus produced can be dry-blended with other detersive andlor
aesthetic ingredients, as disclosed hereinafter, to provide fully-formulated
detergent
compositions. Alternatively, various optional ingredients such as soil release
polymers can be added in Seep (a) and/or (e). A liquid solution of dye
transfer
inhibitor can be added into .Step (a) and/or sprayed onto the granule of Step
(e)
before the nonionic binder is sprayed on. Brighteners can be added at Step (a)
and/or
pre-mixed in the nonionic surfactants before Step (e). Liquid perfume can be
sprayed
on in step (e).
In alternate modes, the type of surfactant paste in Step (b) can vary
depending on the desired formulation; AS paste, AS/AES (alkyl ethoxy sulfate)
paste, LAS/AS paste, oleoyl sarcosinate paste, polyhydroxy fatty acid amide,
etc. can
all be used. The preferred paste moisture level is lower than 20%, by weight,
in
order for moisture of the detergent dough to be less than 10%.
The type of nonionics used in the coating of Step (d) can vary between
Neodol~ 23-6.5, 45-7, 25-9, ar other commonly used nonionics, e.g.,
polyhydroxy
fatty acid amide, APG, and polyethylene glycol (PEG). Water can be used as a
coating binder instead of the nonionic surfactant.
Adding pressure to the. kneader vessel in Step (b) can help to reduce kneading
batch time and also give better mixing and dispersion. This will allow the use
of
equipment such as a twin screw extruder.
The diameter of the holes in the extruder die can vary from 500-1000
micrometers depending on final agglomerate appearance, desired surfactant
dissolution rate, and/or yield o~f the final agglomerate.
Process equipment is variable. Twin screw extruder, high speed vertical mixer
and horizontal mixer, are acceptable replacements for the batch kneader and
extnrder.
Dissolution of the SAS particles prepared in the manner of this invention can
be assessed by any convenient means, without undue experimentation. For
example,
CA 02248263 2001-06-28
tz
the SAS particles can be placed in water for incremental periods of time, and
their
rate of dissolution measured by titrating the amount of dissolved SAS.
In a practical method which approximates what might be seen by the
consumer, the deposition of undissolved SAS particles on fabric is measured.
In this
method, the SAS particles are first rif3led to ensure sample homogeneity. 1.5
grams
of the particles are weighed ou.t An aliquot of water (typically, 1 liter of
medium
hardness city water) is equilibrated at any desired test temperature
(conveniently
room temperature ca. 20 °C;). 'fhe SAS particles are added to a Terg-O-
Tomete
first before pouring in the one liter water. Four to five samples can be run
in the
same run.
The SAS particles are agitated for 10 minutes at 50 rpm in the Terg-O-
Tometer. At the end of agitation period, the entire contents are poured onto a
90
mm Hiichner funnel covered with a black test fabric, "C70", available from
EMC,
using standard suction filtration by water aspirator vacuum. The Terg-O-
Tometer is
rinsed with S00 ml of additional water with the same hardness and temperature
and
poured through the fabric on the Buchner funnel.
After filtration, the black fabric is dried in an oven with a setting of
49°C to
60°C. The appearance of the fabric is then visually graded on a 1-10
scale, 10 being
the worst, i.e., with the most insoluble SAS panicles on the fabric, while a
grade of 1
'.20 is the best.
If desired, a confirming test can be run. 1n this test, the solution from the
Terg-O-Tometer is filtered through a I micron cellulose filter with vacuum.
The
resulting solution is then titrated for anionic surfactant concentration,
using the
industry standard 2-phase, Hyamine~/mixed indicator method. Hyamine is
available
:ZS from Sigma Chemical Company.
In an alternate mode, the so-called "cat-S03" titration method can be used.
In this technique, samples of the aqueous laundering liquor containing the SAS
(or
fully-formulated SAS detergent composition) can be taken after one minute and
filtered with 0.45 mm nylon filter HPLC, after which the filtered solution is
titrated
:30 with Hyamine in the presence of anionic indicator dyes, as noted above.
The amount
of SAS dissolved in the aqueous liquor is thereby determined.
SAS particles prepared by the process of the present invention exhibit
improved solubility, i.e., a 10 nninute solubility in water which is typically
about 4X
to about 6X greater than unprocessed SAS particles, especially at cold (ca.
5°C) or
35 cool (15°C-45°C) wash temperatures. Said another way, the
particles herein are at
least about 70%, typically from about 90% to about 100%, dissolved in cold or
cool
CA 02248263 1998-08-31
WO 97/32950 PCT/US97l02175
13
water in about 10 minutes, as compared with unprocessed SAS particles which
are
only 20%-30% dissolved under the same conditions.
Formulation Ingredients
The fully-formulated granular detergent compositions which are prepared
using the SAS particles of this invention will typically comprise various
other
formulation ingredients to provide auxiliary cleaning and fabric care
benefits,
aesthetic benefits and processing aids. The following are non-limiting
examples of
such ingredients which are typical for use in the commercial practice of the
present
invention, especially to provide high quality fabric laundry detergent
compositions.
Builders - Detergent builders can optionally be included in the compositions
herein to assist in controlling mineral hardness. Inorganic as well as organic
builders
can be used. Builders are typically used in fabric laundering compositions to
assist in
the removal of particulate soils.
The level of builder can vary widely depending upon the end use of the
composition and its desired physical form. When present, the compositions will
typically comprise at least about 1 % builder. Granular formulations typically
comprise from about 10% to about 80%, more typically from about i 5% to about
50% by weight, of the detergent builder. Lower or higher levels of builder,
however,
are not meant to be excluded.
Inorganic or P-containing detergent builders include, but are not limited to,
the alkali metal, ammonium and alkanolammonium salts of polyphosphates
(exemplified by the tripolyphosphates, pyrophosphates, and glassy polymeric
meta-
phosphates), phosphonates, phytic acid, silicates, carbonates (including
bicarbonates
and sesquicarbonates), sulphates, and aluminosilicates. However, non-phosphate
builders are required in some locales. Importantly, the compositions herein
function
surprisingly well even in the presence of the so-called "weak" builders (as
compared
with phosphates) such as citrate, or in the so-called "underbuilt" situation
that may
occur with zeolite or layered silicate builders.
Examples of silicate builders are the alkali metal silicates, particularly
those
having a Si02:Na20 ratio in the range 1.6:1 to 3.2:1 and layered silicates,
such as
the layered sodium silicates described in U.S. Patent 4,664,839, issued May
12, 1987
to H. P. Rieck. NaSKS-6 is the trademark for a crystalline layered silicate
marketed
by Hoechst (commonly abbreviated herein as "SKS-6"). Unlike zeolite builders,
the
Na SKS-6 silicate builder does not contain aluminum. NaSKS-6 has the delta
Na2Si05 morphology form of layered silicate. It can be prepared by methods
such
as those described in German DE-A-3,417,649 and DE-A-3,742,043. SKS-6 is a
highly preferred layered silicate for use herein, but other such layered
silicates, such
CA 02248263 1998-08-31
WO 97/32950 PCT/US97/02175
14
as those having the general formula NaMSix02x+i-YH20 wherein M is sodium or
hydrogen, x is a number from 1.9 to 4, preferably 2, and y is a number from 0
to 20,
preferably 0 can be used herein. Various other layered silicates from Hoechst
include
NaSKS-5, NaSKS-7 and NaSKS-1 l, as the alpha, beta and gamma forms. As noted
above, the delta-Na2Si05 (NaSKS-6 form) is most preferred for use herein.
Other
silicates may also be useful such as for example magnesium silicate, which can
serve
as a crispening agent in granular formulations, as a stabilizing agent for
oxygen
bleaches, and as a component of suds control systems.
Examples of carbonate builders are the alkaline earth and alkali metal
carbonates as disclosed in German Patent Application No. 2,321,001 published
on
November 15, 1973.
Aiuminosilicate builders are useful in the present invention. AluminosiIicate
builders are of great importance in most currently marketed heavy duty
granular
detergent compositions. Aluminosilicate builders include those having the
empirical
formula:
Mz(zA102)y] ~ xH20
wherein z and y are integers of at least 6, the molar ratio of z to y is in
the range from
1.0 to about 0.5, and x is an integer from about 1 S to about 264.
Useful aluminosilicate ion exchange materials are commercially available.
These aluminosilicates can be crystalline or amorphous in structure and can be
naturally-occurring aluminosilicates or synthetically derived. A method for
producing aluminosilicate ion exchange materials is disclosed in U.S. Patent
3,985,669, Krummei, et al, issued October I2, 1976. Preferred synthetic
crystalline
aluminosilicate ion exchange materials useful herein are available under the
designations Zeolite A, Zeolite P (B), Zeolite MAP and Zeolite X. In an
especially
preferred embodiment, the crystalline aluminosilicate ion exchange material
has the
formula:
Nal2[(A102)12(Si02)12)W"~20
wherein x is from about 20 to about 30, especially about 27. This material is
known
as Zeolite A. Dehydrated zeolites (x = 0 - 10) may also be used herein.
Preferably,
the aluminosilicate has a particle size of about 0. I-10 microns in diameter.
Organic detergent builders suitable for the purposes of the present invention
include, but are not restricted to, a wide variety of polycarboxylate
compounds. As
used herein, "polycarboxylate" refers to compounds having a plurality of
carboxyiate
groups, preferably at least 3 carboxyiates. Polycarboxylate builder can
generally be
added to the composition in acid form, but can also be added in the form of a
CA 02248263 2001-06-28
neutralized salt. When utilized in salt form. alkali metals, such as sodium,
potassium,
and lithium, or alkanolammonium salts are preferred.
Included among the polycarboxylate builders are a vat7ety of categories of
useful materials. One important category of polycarboxylate builders
encompasses
5 the ether polycarboxylates, including oxydisuccinate, as disclosed in Berg,
U.S.
Patent 3,128,287, issued April 7, 1964, and Lamberti et al, U.S. Patent
3,635,830,
issued January 18, 1972. See also "TMSffDS" builders of U.S. Patent 4,663,071,
issued to Bush et al, on May 5, 1987. Suitable ether polycarboxylates also
include
cyclic compounds, particularly alicyclic compounds, such as those described in
U.S.
10 Patents 3,923,679; 3,835,163; 4,158,635; 4,120,874 and 4,102,903.
Other useful detergency builders include the ether hydroxypolycarboxylates,
copolymers of malefic anhydride with ethylene or vinyl methyl ether, 1, 3, 5-
trihydroxy benzene-2, 4, 6-trisulphonic acid, and carboxymethyloxysuccinic
acid, the
various alkali metal, ammonium and substituted ammonium salts of polyacetic
acids
15 such as ethylenediamine tetraacetic acid and nitrilotriacetic acid ("N?A"),
as well as
polycarboxylates such as mc~llitic acid, succinic acid, oxydisuccinic acid,
polymaleic
acid, benzene 1,3,5-tricarboxyIic acid, carboxymethyloxysuccinic acid, and
soluble
salts thereof.
Citrate builders can be used in granular compositions, especially in
combination with zeolite and/or layered silicate builders. Oxydisuccinates are
also
especially useful in such compositions and combinations.
Also suitable in the detergent compositions of the present invention are the
3,3-dicarboxy-4-oxa-1,6-hexanedioates and the related compounds disclosed in
U.S.
Patent 4,566,984, Bush, issued January 28, 1986. Useful succinic acid builders
include the CS-C2p alkyl and alkenyl succinic acids and salts thereof. A
particularly
preferred compound of this type is dodecenylsuccinic acid. Specific examples
of
succinate builders include: !laurylsuccinate, myristylsuccinate,
palmitylsuccinate, 2-
dodecenylsuccinate (preferred), 2-pentadecenylsuccinate, and the like.
Laurylsuccinates are the preferred builders of this group, and are described
in
European Patent Application 0,200,263, published November 5, 1986.
Other suitable polyc;a.rboxylates are disclosed in U.S. Patent 4,144,226,
Crutchfield et al, issued March 13, 1979 and in U.S. Patent 3,308,067, Diehl,
issued
March 7, 1967. See also Diehl U.S. Patent 3,723,322.
Fatty acids, e.g., C 1,2-C 1 g monocarboxyiic acids, can also be incorporated
into the compositions alone, or in combination with the aforesaid builders,
especially
citrate andlor the succinate builders, to provide additional builder activity.
Such use
CA 02248263 2001-06-28
1&
of fatty acids will generally result in a diminution of sudsing, which should
be taken
into account by the formulator.
In situations where phosphorus-based builders can be used, and especially in
the formulation of bars used for hand-laundering operations, the various
alkali metal
:S phosphates such as the well-knov~n sodium tripolyphosphates, sodium
pyrophosphate
and sodium orthophosphate can be used. Phosphonate builders such as ethane-1-
hydroxy-1,1-diphosphonate and other known phosphonates (see, for example, U.S.
Patents 3,159,581; 3,213,030; :3,422,021; 3,400,148 and 3,422,137) can also be
used.
1~D Enzymes - Enrymes can be included in the formulations herein for a wide
variety of fabric laundering purposes, including removal of protein-based,
carbohydrate-based, or triglyceri~de-based stains, for example, and for the
prevention
of fuuitive dye transfer, and for 'fabric restoration. Such enrymes include
proteases,
amylases, lipases, cellulases, and peroxidases, as well as mixtures thereof.
Other
15 types of enzymes may also be included. They may be of any suitable origin,
such as
vegetable, animal, bacterial, fungal and yeast origin. However, their choice
is
governed by several factors such as pH-activity andlor stability optima,
thermostability, stability versus active detergents, builders and so on. In
this respect
bacterial or fungal enzymes are preferred, such as bacterial amylases and
proteases,
20 and fungal cellulases.
Enzymes are normally incorporated at levels sufficient to provide up to about
mg by weight, more typically .about 0.01 mg to about 3 mg, of active enzyme
per
gram of the composition. Stated otherwise, the compositions herein will
typically
comprise from about 0.001% t~o about 5%, preferably 0.01%-3% by weight of a
25 commercial enryme preparation. Protease enzymes are usually present in such
commercial preparations at levels sufficient to provide from 0.005 to 0.1
Anson units
(AU) of activity per gram of composition.
Suitable examples of proteases are the subtilisins which are obtained from
particular strains of B. subtilis and B. licheniforrns. Another suitable
protease is
?.p obtained from a strain of Bacillus, having maximum activity throughout the
pH range
of 8-12, developed and sold by Novo Industries A/S under the registered trade
name
ESPERASE. The preparation of this enzyme and analogous enzymes is described in
British Patent Specification No. 1,243,784 of Novo. Proteoiytic enzymes
suitable for
removing protein-based stains that are commercially available include those
sold
:15 under the trademarks ALCALASE and SAV1NASE by Novo Industries A/S
(Denmark) and MAXA.TASE by International Bio-Synthetics, Inc. (The
Netherlands). Other proteases include Protease A (see European Patent
Application
CA 02248263 2001-06-28
17
130,756, published January 9, 1985) and Protease B (see European Patent
Application 251,446, published January 7, 1988 and European Patent
Application 130,756, Bott et al, published January 9, 1985).
Amylases include, for example, a-amylases described in British Patent
TM
Specification No~,296,839 (Novo), RA.PIDASE, International Bio-Synthetics,
Inc.
and TER.~rIAMYL, Novo Industries.
The cellulase usable in the present invention include both bacterial or fungal
cellulase. Preferably, they will have a pH optimum of between S and 9.5.
Suitable
cellulases are disclosed in L1.S. Patent 4,435,307, Barbesgoard et al, issued
March 6,
1984, which discloses fungal cellulase produced from Humicola insolens and
Humicola strain DSM l 800 or a cellulase 212-producing fungus belonging to the
genus Aeromonas, and cellulase extracted from the hepatopancreas of a marine
mollusk (Dolabella Auricula Solander). suitable cellulases are also disclosed
in GB-
TM
A-2.075.028; GB-A-2.095.2.'5 and DE-OS-2.247.832. CAREZY1V~ (Novo) is
especially useful.
Suitable lipase enzymes for detergent usage include those produced by
microorganisms of the Pseudomonas group, such as Pseudomonas stutzeri ATCC
19.154, as disclosed in British, Patent 1,372,034. See also lipases in
Japanese Patent
Application 53,20487, laid open to public inspection on February 24, 1978.
This
lipase is available from Amano Pharmaceutical Co. Ltd., Nagoya, Japan, under
the
trade mark Lipase P "AJnano," hereinafter referred to as "Amano-P." Other
commercial lipases include punano-CES, lipases ex Chromobacter viscosum, e.g.
Chromobacter viscosum var. lipolyticum NR.RLB 3673, commercially available
from
Toyo Jozo Co., Tagata, 3apan; and further Chromobacter viscosum lipases from
U.S.
Biochemical Corp., U.S.A. and Disoynth Co., The Netherlands, and lipases ex
TM
Pseudomonas gladioli. The LIPOLASE enzyme derived from Humicola lanuginosa
and commercially available from Novo (see also EPO 341,947) is a preferred
lipase
for use herein.
Peroxidase enzymes are used in combination with oxygen sources, e.g.,
percarbonate, perborate, per:>ulfate, hydrogen peroxide, etc. They are used
for
"solution bleaching," i.e. to prevent transfer of dyes or pigments removed
from
substrates during wash operations to other substrates in the wash solution.
Peroxidase enzymes are known in the art, and include, for example, horseradish
peroxidase, ligninase, and haloperoxidase such as chloro- and bromo-
peroxidase.
Peroxidase-containing detergent compositions are disclosed, for example, in
PCT
International Application WO 89/099813, published October 19, 1989, by O.
Kirk,
assigned to Novo Industries AIS.
CA 02248263 2001-06-28
18
A wide range of enzyme materials and means for their incorporation into
synthetic detergent compositions are also disclosed in U.S. Patent 3,553,139,
issued
January 5, 1971 to McCarty et al. Enzymes are further disclosed in U.S. Patent
4,101,457, Place et al, issued July 18, 1978, and in U.S. Patent 4,507,219,
Hughes,
issued March 26, 1985, both Enzyme materials useful for detergent
formulations,
and their incorporation into such formulations, are disclosed in U.S. Patent
4,261,868, Hora et al, issued A~prit 14, 1981. Enzymes for use in detergents
can be
stabilized by various techniques. Enryme stabilization techniques are
disclosed and
exemplified in U.S. Patent 3,600,319, issued August 17, 1971 to Gedge, et al,
and
European Patent Application Publication No. 0 199 405, published October 29,
1986, Venegas. Enzyme stabilization systems are also described, for example,
in
U.S. Patent 3,519,570.
Enzyme Stabilizers - ?he enzymes employed herein may be stabilized by the
presence of water-soluble sources of calcium andlor magnesium ions in the
finished
:l5 compositions which provide sunh ions to the enzymes. (Calcium ions are
generally
somewhat more effective than magnesium ions and are preferred herein if only
one
type of canon is being used.) Additional stability can be provided by the
presence of
various other art-disclosed stabilizers, especially borate species: see
Severson, U.S.
4,537,706. Typical detergents will comprise from about 1 to about 30,
preferably
.20 from about 2 to about 20, more preferably from about 5 to about I5, and
most
preferably from about 8 to about 12, millimoles of calcium ion per kg of
finished
composition. This can vary somewhat, depending on the amount of enryme present
and its response to the calcium or magnesium ions. The level of calcium or
magnesium ions should be selected so that there is always some minimum level
25 available for the enzyme, after allowing for complexation with builders,
fatty acids,
etc., in the composition. Any water-soluble calcium or magnesium salt can be
used
as the source of calcium or magnesium ions, including, but not limited to,
calcium
chloride, calcium sulfate, calcium malate, calcium maleate, calcium hydroxide,
calcium formate, and calcium acetate, and the corresponding magnesium salts. A
30 small amount of calcium ion, generally from about 0.05 to about 0.4
millimoles per
kg, is often also present in the composition due to calcium in the enzyme
slurry and
formula water. In solid detergent compositions the formulation may include a
sufficient quantity of a water-soluble calcium ion source to provide such
amounts in
the laundry liquor. In the alternative, natural water hardness may suffice.
35 It is to be understood that the foregoing levels of calcium andlor
magnesium
ions are sufficient to provide enzyme stability. More calcium and/or magnesium
ions
can be added to the compositions to provide an additional measure of grease
removal
CA 02248263 2001-06-28
19
performance. Accordingly, as a general proposition the compositions herein
will
typically comprise from about 0.05% to about 2% by weight of a water-soluble
source of calcium or magnesium ions, or both. The amount can vary, of course,
with
the amount and type of enzyme employed in the composition.
The compositions herein may also optionally, but preferably, contain various
additional stabilizers, especially borate-type stabilizers. Typically, such
stabilizers
will be used at levels in the compositions from about 0.25% to about 10%,
preferably
from about 0.5% to about 5°,%, more preferably from about 0.75% to
about 3%, by
weight of boric acid or other borate compound capable of forming boric acid in
the
composition (calculated on the basis of boric acid). Boric acid is preferred,
although
other compounds such as boric oxide, borax and other alkali metal borates
(e.g.,
sodium ortho-, meta- and pyroborate, and sodium pentaborate) are suitable.
Substituted boric acids (e.g., phenylboronic acid, butane boronic acid, and p-
bromo
phenylboronic acid) can also be used in place of boric acid.
Bleaching Compounfs - Bleaching A ents and Bleach Activators - The
detergent compositions herein may optionally contain bleaching agents or
bleaching
compositions containing a bleaching agent and one or more bleach activators.
When
present, bleaching agents will typically be at levels of from about 1% to
about 30%,
more typically from about 5% to about 20%, of the detergent composition,
especially
for fabric laundering. If present, the amount of bleach activators will
typically be
from about 0.1% to about 60~%, more typically from about 0.5% to about 40% of
the
bleaching composition comprising the bleaching agent-plus-bleach activator.
The bleaching agents used herein can be any of the bleaching agents useful for
detergent compositions in textile cleaning, hard surface cleaning, or other
cleaning
purposes that are now known or become known. These include oxygen bleaches as
well as other bleaching agents. Perborate bleaches, e.g., sodium perborate
(e.g.,
mono- or tetra-hydrate) can be used herein.
Another category of bleaching agent that can be used without restriction
encompasses percarboxylic acid bleaching agents and salts thereof. Suitable
examples of this class oif agents include magnesium monoperoxyphthaiate
hexahydrate, the magnesium salt of metachloro perbenzoic acid, 4-nonylamino-4-
oxoperoxybutyric acid and diperoxydodecanedioic acid. Such bleaching agents
are
disclosed in U.S. Patent 4,4183,781, Hartman, issued November 20, 1984, U.S.
Patent No. 4,806,632, Burns et al, issued February 21, 1989, European Patent
Application 0,133,354, Banks et al, published February 20, 1985, and U.S.
Patent
4,412,934, Chung et al, issued November l, 1983. Highly preferred bleaching
agents
CA 02248263 2001-06-28
also include 6-nonyiamino-6-oxoperoxycaproic acid as described in U.S. Patent
4,634,551, issued January 6, 19;87 to Burns et al.
Peroxygen bleaching agents can also be used. Suitable peroxygen bleaching
compounds include sodium carbonate peroxyhydrate and equivalent "percarbonate"
S bleaches, sodium pyrophosphate peroxyhydrate, urea peroxyhydrate, and sodium
TM
peroxide. Persulfate bleach (e.l~., OXONE, manufactured commercially by
DuPont)
can also be used.
A preferred percarbonate bleach comprises dry particles having an average
particle size in the range from .about 500 micrometers to about 1,000
micrometers,
l0 not more than about 10% by weight of said particles being smaller than
about 200
micrometers and not more than about 10% by weight of said particles being
larger
than about 1,250 micrometers. Optionally, the percarbonate can be coated with
silicate, borate or water-soluble surfactants. Percarbonate is available from
various
commercial sources such as FMC, Solvay and Tokai Denka.
l5 Mixtures of bleaching agents can also be used.
Peroxygen bleaching aszents, the perborates, the percarbonates, etc., are
preferably combined with bleach activators, which lead to the in situ
production in
aqueous solution (i.e., during the washing process) of the peroxy acid
corresponding
to the bleach activator. Various nonlimiting examples of activators are
disclosed in
20 U.S. Patent 4,915,854, issued April 10, 1990 to Mao et al, and U.S. Patent
4,412,934. The nonanoyloxybertzene sulfonate (NOBS) and tetraacetyl ethylene
diamine (TAED) activators are typical, and mixtures thereof can also be used.
See
also U.S. 4,634,551 for other typical bleaches and activators useful herein.
Highly preferred amido-.derived bleach activators are those of the formulae:
:ZS R1N(RS)C(O)R2C(O)L or R1C(O)N(RS)R2C(O)L
wherein R1 is an alkyl group containing from about 6 to about 12 carbon atoms,
R2
is an alkylene containing from 1. to about 6 carbon atoms, RS is H or alkyl,
aryl, or
alkaryl containing from about 1 to about 10 carbon atoms, and L is any
suitable
leaving group. A leaving group is any group that is displaced from the bleach
:30 activator as a consequence of the nucleophilic attack on the bleach
activator by the
perhydrolysis anion. A preferred leaving group is phenyl sulfonate.
Preferred examples of bleach activators of the above formulae include (6-oct
anamido-caproyl)oxybertienesulfonate, (6-
nonanamidocaproyl)oxybenzenesulfonate,
(6-decanamido-caproyl)oxyben:.enesulfonate, and mixtures thereof as described
in
35 U.S. Patent 4,634,551.
Another class of bleach activators comprises the benzoxazin-type activators
disclosed by Hodge et al in U.S. Patent 4,966,723, issued October 30, 1990,
CA 02248263 2001-06-28
21
A highly preferred activator of the benzoxazi.n-type is
0
II
CEO
C
N
Still another class of preferred bleach activators includes the aryl lactam
activators, especially acyl caprolactams and acyl valerolactams of the
formulae:
O 0
O C-CH2-1;, H2\ O C-CH2-CH2
R6-C -N~ C H R6-C -N
CH2-C;H2~ 2 NCH - ~ H
2 2
wherein R6 is H or an alkyl, aryl, alkoxyaryl, or alkaryi group containing
from 1 to
about 12 carbon atoms. Highly preferred lactam activators include benzoyl
caprolactam, octanoy) caprolactam, 3,5,5-trimethylhexanoyi caprolactam,
nonanoyl
caprolactam. decanoyi caprola~ctam, undecenoyl caprolactam, benzoyl
valerolactam,
octanoyl valerolactam, decanoyl valerolactam, undecenoyi valerolactam,
nonanoyl
valerolactam, 3,5,5-trimethylhexanoyl valerolactam and mixtures thereof. See
also
U.S. Patent 4,545,784, issued to Sanderson, October 8, 1985, which discloses
acyl
caprolactams, including benzc~yl caprolactam, adsorbed into sodium perborate.
Bleaching agents other than oxygen bleaching agents are also known in the
art and can be utilized herein. One type of non-oxygen bleaching agent of
particular
interest includes photoactivated bleaching agents such as the sulfonated zinc
and/or
aluminum phthalocyanines. .See U.S. Patent 4,033,718, issued July S, 1977 to
Holcombe et al. If used, detergent compositions will typically contain from
about
0.025% to about 1.25%, by weight, of such bleaches, especially sulfonate zinc
phthalocyanine.
If desired, the bleactung compounds can be catalyzed by means of a
manganese compound. Such compounds are well known in the art and include, for
example, the manganese-based catalysts disclosed in U.S. Pat. 5,246,621, U.S.
Pat.
5,244,594; U.S. Pat. 5,194,416; U.S. Pat. 5,114,606; and European Pat. App.
Pub.
Nos. 549,271A1, 549,272A1, 544,440A2, and 544,490A1; Preferred examples of
these catalysts include MnIV2(u-O)3(1,4,7-trimethyl-1,4,7-triazacyclo-
nonane)2(PF6)2, MnIII2(u_O)~1(u-OAc)~(1,4,7-trimethyl-1,4,7-
triazacyclononane)2-
(C104)2, MnIV4(u-O)6(1,4.7-triazacyclononane)4(CI04)4, MnIII~IV4(u-O)1(u-
CA 02248263 1998-08-31
WO 97/32950 PCTIUS97/02175
22
OAc)2-(1,4,7-trimethyl-1,4,7-triazacyclononane)~(C104)3, MnIV(1,4,7-trimethyl-
1,4,7-triazacyclononane)- (OCH3)3 (PF6), and mixtures thereof. Other metal-
based
bleach catalysts include those disclosed in U.S. Pat. 4,430,243 and U.S. Pat.
5,114,611. The use of manganese with various complex ligands to enhance
bleaching
is also reported in the following United States Patents: 4,728,455; 5,284,944;
5,246,612; 5,256,779; 5,280, I 17; 5,274,147; 5,153,161; and 5,227,084.
As a practical matter, and not by way of limitation, the compositions and
processes herein can be adjusted to provide on the order of at least one part
per ten
million of the active bleach catalyst species in the aqueous washing liquor,
and will
preferably provide from about 0.1 ppm to about 700 ppm, more preferably from
about 1 ppm to about 500 ppm, of the catalyst species in the laundry liquor.
Polymeric Soil Release Agent - Any polymeric soil release agent known to
those skilled in the art can optionally be employed in the compositions and
processes
of this invention. Polymeric soil release agents are characterized by having
both
hydrophilic segments, to hydrophilize the surface of hydrophobic fibers, such
as
polyester and nylon, and hydrophobic segments, to deposit upon hydrophobic
fibers
and remain adhered thereto through completion of washing and rinsing cycles
and,
thus, serve as an anchor for the hydrophilic segments. This can enable stains
occurring subsequent to treatment with the soil release agent to be more
easily
cleaned in later washing procedures.
The polymeric soil release agents useful herein especially include those soil
release agents having: (a) one or more nonionic hydrophile components
consisting
essentially of (i) polyoxyethylene segments with a degree of polymerization of
at least
2, or (ii) oxypropylene or polyoxypropylene segments with a degree of
polymerization of from 2 to 10, wherein said hydrophile segment does not
encompass
any oxypropylene unit unless it is bonded to adjacent moieties at each end by
ether
linkages, or (iii) a mixture of oxyalkylene units comprising oxyethylene and
from 1 to
about 30 oxypropylene units wherein said mixture contains a sufficient amount
of
oxyethylene units such that the hydrophile component has hydrophilicity great
enough to increase the hydrophilicity of conventional polyester synthetic
fiber
surfaces upon deposit of the soil release agent on such surface, said
hydrophile
segments preferably comprising at least about 25% oxyethylene units and more
preferably, especially for such components having about 20 to 30 oxypropylene
units,
at least about 50% oxyethylene units; or (b) one or more hydrophobe components
comprising (i) C3 oxyalkylene terephthalate segments, wherein, if said
hydrophobe
components also comprise oxyethylene terephthalate, the ratio of oxyethylene
terephthalate:C3 oxyalkylene terephthalate units is about 2:1 or lower, (ii)
C4-C6
CA 02248263 2001-06-28
23
alkylene or oxy C4-C6 alkylene segments, or mixtures therein, (iii) poly
(vinyl ester)
segments, preferably polyvinyl acetate), having a degree of polymerization of
at lease
2, or (iv) CI-C4 alkyl ether or C4 hydroxyalkyl ether substituents, or
mixtures
therein, wherein said substituents are present in the form of CI-C4 alkyl
ether or C4
hydroxyalkyl ether cellulose derivatives, or mixtures therein, and such
cellulose
derivatives are amphiphiiic, whereby they have a sufficient level of C ~-C4.
alkyl ether
and/or C4 hydroxyalkyl ether units to deposit upon conventional polyester
synthetic
fiber surfaces and retain a sufficient level of hydroxyls, once adhered to
such
conventional synthetic fiber surface, to increase fiber surface
hydrophilicity, or a
combination of (a) and (b).
Typically, the polyoxyethylene segments of (a)(i) will have a degree of
polymerization of from abaut 200, although higher levels can be used,
preferably
from 3 to about I50, more preferably from 6 to about 100. Suitable oxy Cg-C6
alkylene hydrophobe segments. include, but are not limited to, end-caps of
polymeric
soil release agents such as M03S(CH2)nOCH2CH20-, where M is sodium and n is
an integer from 4-6, as disclosed in U.S. Patent 4,721,580, issued January 26,
1988
to Gosselink.
Polymeric soil release agents useful in the present invention also include
cellulosic derivatives such as hydroxyether cellulosic polymers, copolymeric
blocks
of ethylene terephthalate or propylene terephthalate with polyethylene oxide
or
polypropylene oxide terephthalate, and the like. Such agents are commercially
available and include hydro~,yethers of cellulose such as METHOCEL (Dow).
Cellulosic soil release agents for use herein also include those selected from
the
group consisting of CI-C4 alkyl and C4 hydroxyalkyl cellulose; see U.S. Patent
4,000,093, issued December 2.8, 1976 to Nicol, et al.
Soil release agents characterized by polyvinyl ester) hydrophobe segments
include graft copolymers of polyvinyl ester), e.g., C I-C6 vinyl esters,
preferably
polyvinyl acetate) grafted onto polyalkylene oxide backbones, such as
polyethylene
oxide backbones. See Eurape:an Patent Application 0 219 048, published April
22,
1987 by Kud, et al. Commercially available soil release agents of this kind
include
r~
the SOKALAN type of material, e.g., SOKALAN HP-22, available from BASF
(West Germany).
One type of preferred soil release agent is a copolymer having random blocks
of ethylene terephthalate and polyethylene oxide (PEO) terephthalate. The
molecular
weight of this polymeric soil release agent is in the range of from about
25,000 to
about 55,000. See U.S. Patent 3,959,230 to Hays, issued May 25, 1976 and U.S.
Patent 3,893,929 to Basadur issued July 8, 1975.
CA 02248263 2001-06-28
24
Another preferred polvrneric soil release agent is a polyester with repeat
units
of ethylene terephthalate units contains 10-! 5% by weight of ethylene
terephthalate
units together with 90-80% by weight of polyoxyethylene terephthalate units,
derived
from a polyoxvethylene glycol ~of average molecular weight 300-5,000. Examples
of
TM
this polymer include the commercially available material ZELCON 5126 (from
TM
DuPont) and MILEASE T (firom 1CI). See also U.S. Patent 4,702,857, issued
October 27, 1987 to Gosselink.
Another preferred polymeric soil release agent is a sulfonated product of a
substantially linear ester oligomer comprised of an oligomeric ester backbone
of
terephthaloyl and oxyalkyleneoxy repeat units and terminal moieties covalently
attached to the backbone. These soil release agents are described fully in
U.S. Patent
4,968,451, issued November Ei, 1990 to J.J. Scheibel and E.P. Gosselink. Other
suitable polymeric soil release agents include the terephthalate polyesters of
U.S.
Patent 4,711,730, issued December 8, 1987 to Gosselink et al, the anionic end-
capped oligomeric esters of tJ S. Patent 4,721,580, issued January 26, 1988 to
Gosseiink, and the block polyester oligomeric compounds of U.S. Patent
4,702,857,
issued October 27, 1987 to Gosselink.
Preferred polymeric soul release agents also include the soil release agents
of
U.S. Patent 4,877,89b, issued October 31, 1989 to Maldonado et al, which
discloses
anionic, especially sulfoaroyl, eiad-capped terephthalate esters.
Still another preferred :>oil release agent is an oligomer with repeat units
of
terephthaloyl units, sulfoisoterephthaloyl units, oxyethyleneoxy and oxy-1,2-
propylene units. The repeat units form the backbone of the oligomer and are
preferably terminated with modified isethionate end-caps. A particularly
preferred
soil release agent of this type comprises about one sulfoisophthaloyi unit, 5
terephthaloyl units, oxyethylene:oxy and oxy- I ,2-propyleneoxy units in a
ratio of from
about 1.7 to about 1.8, and two end-cap units of sodium 2-(2-hydroxyethoxy)-
ethanesulfonate. Said soil release agent also comprises from about 0.5% to
about
24%, by weight of the oligo~mer, of a crystalline-reducing stabilizer,
preferably
selected from the group consisting of xylene sulfonate, cumene sulfonate,
toluene
sulfonate, and mixtures thereof.
If utilized, soil release agents will generally comprise from about 0.01 % to
about 10.0%, by weight, of the detergent compositions herein, typically from
about
0.1% to about 5%, preferably from about 0.2% to about 3.0%.
Dye Transfer Inhibiting A ents - The compositions of the present
invention may also include one or more materials effective for inhibiting the
transfer
of dyes from one fabric to another during the cleaning process. Generally,
such dye
CA 02248263 1998-08-31
WO 97/32950 PCT/US97102175
transfer inhibiting agents include polyvinyl pyrrolidone polymers, polyamine N-
oxide
polymers, copolymers of N-vinylpyrrolidone and N-vinyiimidazole, manganese
phthalocyanine, peroxidases, and mixtures thereof. If used, these agents
typically
comprise from about 0.01 % to about 10% by weight of the composition,
preferably
5 from about 0.01% to about 5%, and more preferably from about 0.05% to about
2%.
More specifically, the polyamine N-oxide polymers preferred for use herein
contain units having the following structural formula: R-Ax-P; wherein P is a
polymerizable unit to which an N-O group can be attached or the N-O group can
form part of the polymerizable unit or the N-O group can be attached to both
units; A
10 is one of the following structures: -NC(O)-, -C(O)O-, -S-, -0-, -N=; x is 0
or 1; and
R is aliphatic, ethoxylated aIiphatics, aromatics, heterocyclic or alicyclic
groups or
any combination thereof to which the nitrogen of the N-O group can be attached
or
the N-O group is part of these groups. Preferred polyamine N-oxides are those
wherein R is a heterocyclic group such as pyridine, pyrroie, imidazole,
pyrrolidine,
15 piperidine and derivatives thereof.
The N-O group can be represented by the following general structures:
O O
I
~t )x ~ -~2)y~ =N-~t )x
(R3 )z
wherein R1, R2, R3 are aliphatic, aromatic, heterocyclic or alicyclic groups
or
combinations thereof; x, y and z are 0 or l; and the nitrogen of the N-O group
can be
20 attached or form part of any of the aforementioned groups. The amine oxide
unit of
the polyamine N-oxides has a pKa <10, preferably pKa <7, more preferred pKa
<6.
Any polymer backbone can be used as long as the amine oxide polymer
formed is water-soluble and has dye transfer inhibiting properties. Examples
of
suitable polymeric backbones are polyvinyls, polyalkylenes, polyesters,
polyethers,
25 polyamide, polyimides, polyacrylates and mixtures thereof. These polymers
include
random or block copolymers where one monomer type is an amine N-oxide and the
other monomer type is an N-oxide. The amine N-oxide polymers typically have a
ratio of amine to the amine N-oxide of 10:1 to 1:1,000,000. However, the
number of
amine oxide groups present in the polyamine oxide polymer can be varied by
appropriate copolymerization or by an appropriate degree of N-oxidation. The
polyamine oxides can be obtained in almost any degree of polymerization.
Typically,
the average molecular weight is within the range of 500 to 1,000,000; more
preferred
1,000 to 500,000; most preferred 5,000 to 100,000. This preferred class of
materials
can be referred to as "PVNO".
CA 02248263 2001-06-28
Zs
The most preferred polyamine N-oxide useful in the detergent compositions
herein is poly(4-vinylpyridine-N-oxide) which as an average molecular weight
of
about 50,000 and an amine to amine N-oxide ratio of about 1:4.
Copolymers of N-vinylpyrrolidone and N-vinylimidazole polymers (referred to
as a class as "PVPVI") are also preferred for use herein. Preferably the PVPVI
has
an average molecular weight range from 5,000 to 1,000,000, more preferably
from
5,000 to 200,000, and most preferably from 10,000 to 20,000. (The average
molecular weight range is determined by light scattering as described in
Harth, et al.,
Chemical Analysis, Vol 113. "Modern Methods of Polymer
Characterization"). The PVPVI copolymers typically have a
molar ratio of N-vinylimidazole to N-vinylpyrrolidone from 1:1 to
0.2:1, more preferably from 0.8:1 to 0.3:1, most preferably from 0.6:1 to
0.4:1.
'These copolymers can be either linear or branched.
The present invention compositions also may employ a polyvinyipyrrolidone
("PVP") having an average molecular weight of from about 5,000 to about
400,000,
preferably from about 5,000 to about 200,000, and more preferably from about
5,000
to about 50,000. PVP's are known to persons skilled in the detergent field;
see, for
example, EP-A-262,897 and EP-A-256,696, incorporated herein by reference.
Compositions containing PVP can also contain polyethylene glycol ("PEG")
having
an average molecular weight from about 500 to about 100,000, preferably from
about
1,000 to about 10,000. Preferably, the ratio of PEG to PVP on a ppm basis
delivered
in wash solutions is from about 2:1 to about 50: I , and more preferably from
about
3:1 to about 10:1.
The detergent compositions herein may also optionally contain from about
0.005% to 5% by weight of certain types of hydrophilic optical brighteners
which
also provide a dye transfer intubition action. If used, the compositions
herein will
preferably comprise from about 0.01% to 1% by weight of such optical
brighteners.
The hydrophilic optical brighteners useful in the present invention are those
having the structural formula:
Rt R2
N H H N
N O~N CO C-C O N~O N
j"' N H H N
R~~ S03M S03M Rt
wherein RI is selected from aniiino, N-2-bis-hydroxyethyl and NH-2-
hydroxyethyl;
R2 is selected from N-2-bis-hydroxyethyl, N-2-hydroxyethyl-N-methylamino,
CA 02248263 2001-06-28
27
morphilino, chloro and amino; and M is a salt-forming cotton such as sodium or
potassium.
When in the above formula, R1 is anilino, R2 is N-2-bis-hydroxyethyi and M
is a cotton such as sodium, the brightener is 4,4',-bis[(4-anilino-6-(N-2-bis
hydroxyethy()-s-triazine-2-yl)amino]-2,2'-stilbenedisulfonic acid and disodium
salt.
This particular brightener species is commercially marketed under the
trademark
Tinopal-UNPA-GX by Ciba-(ieigy Corporation. Tinopal-UNPA-GX is the preferred
hydrophilic optical brightener useful in the detergent compositions herein.
When in the above formula, RI is anilino, R2 is N-2-hydroxyethyl-N-2
methylamino and M is a cotton such as sodium, the brightener is 4,4'-bis[(4-
aniiino-6
(N-2-hydroxyethyl-N-methylamino)-s-triazine-2-yl)amino]2,2'-stilbenedisulfonic
acid
disodium salt. This particular brightener species is commercially_ marketed
under the
trademark Tinopal SHM-GX by Ciba-Geigy Corporation.
When in the above formula, RI is anilino, R2 is morphilino and M is a canon
such as sodium, the bri,ghtener is 4,4'-bis[(4-anilino-6-morphilino-s-triazine-
2
yl)amino)2,2'-stilbenedisulfonic acid, sodium salt. This particular brightener
species is
commercially marketed under the trademark Tinopal AMS-GX by Ciba Geigy
Corporation.
The specific optical brightener species selected for use in the present
invention
provide especially effective dye transfer inhibition performance benefits when
used in
combination with the selected polymeric dye transfer inhibiting agents
hereinbefore
described. The combination of such selected polymeric materials (e.g., PVNO
andJor
PVPVI) with such selected optical brighteners (e.g., Tinopal UNPA-GX, Tinopal
SHM-GX andlor Tinopal A,NiS-GX) provides significantly better dye transfer
inhibition in aqueous wash solutions than does either of these two detergent
composition components when used alone. Without being bound by theory, it is
believed that such brighteners work this way because they have high affinity
for
fabrics in the wash solution a,nd therefore deposit relatively quick on these
fabrics.
The extent to which brighteners deposit on fabrics in the wash solution can be
defined
by a parameter called the "exhaustion coef~tcient". The exhaustion coefficient
is in
general as the ratio of a) the brightener material deposited on fabric to b)
the initial
brightener concentration in the wash liquor. Brighteners with relatively high
exhaustion coefficients are the. most suitable for inhibiting dye transfer in
the context
of the present invention.
Of course, it will be appreciated that other, conventional optical brightener
types of compounds can optionally be used in the present compositions to
provide
CA 02248263 2001-06-28
28
conventional fabric "brightness" benefits, rather than a true dye transfer
inhibiting
effect. Such usage is conventional and well-known to detergent formulations.
Chelatin~ Agents - The detergent compositions herein may also optionally
contain one or more iron and/or manganese cheiating agents. Such chelating
agents
can be selected from the group consisting of amino carboxylates, amino
phosphonates, polyfunctionally-substituted aromatic chelating agents and
mixtures
therein, all as hereinafter defined. Without intending to be bound by theory,
it is
believed that the benefit of these materials is due in part to their
exceptional ability to
remove iron and manganese ions from washing solutions by formation of soluble
chelates.
Amino carboxylates useful as optional chelating agents include
ethyfenediaminetetracetates, N-hydroxyethylethylenediaminetriacetates,
nittilotriace-
tates, ethylenediarnine tetraproprionates, triethylenetetraaminehexacetates,
diethylenetriaminepentaacetates (DTPA), and ethanoidiglycines, alkali metal,
ammonium, and substituted ammonium salts therein and mixtures therein.
Amino phosphonates are also suitable for use as chelating agents in the
compositions of the invention when at least low levels of total phosphorus are
permitted in detergent compositions, and include ethylenediaminetetrakis
(methylenephosphonates) as DIrQUEST. Preferred, these amino phosphonates to
~!0 not contain alkyl or alkenyl groups with more than about 6 carbon atoms.
Polyfunctionally-substituted aromatic chelating agents are also useful in the
compositions herein. See U.S. Patent 3,812,044, issued May 21, 1974, to Connor
et
al. Preferred compounds of this type in acid form are dihydroxydisulfobenzenes
such
as 1,2-dihydroxy-3,5-disulfobenzene.
:!5 A preferred biodegradable chelator for use herein is ethylenediamine
disuccinate ("EDDS"), especially the [S,S] isomer as described in U.S. Patent
4,704,233, November 3, 1987, to Hartman and Perkins.
If utilized, these chelating agents will generally comprise from about 0.1% to
about ! 0% by weight of the detergent compositions herein. More preferably, if
:f0 utilized, the chelating agents will comprise from about 0.1% to about 3.0%
by weight
of such compositions.
Clav Soil RemovaUAnti-redeposition Age nts - The compositions of the
present invention can also optionally contain water-soluble ethoxylated amines
having clay soil removal and antiredeposition properties. Granular detergent
35 compositions which contain these compounds typically contain from about
0.01% to
about 10.0% by weight of the water-soluble ethoxylates amines.
CA 02248263 1998-08-31
WO 97/32950 PCT/LTS97102175
29
The most preferred soil release and anti-redeposition agent is ethoxylated
tetraethylenepentamine. Exemplary ethoxylated amines are further described in
U.S.
Patent 4,597,898, VanderMeer, issued July l, 1986. Another group of preferred
clay
soil removal-antiredeposition agents are the cationic compounds disclosed in
European Patent Application 111,965, Oh and Gosselink, published June 27,
1984.
Other clay soil removal/antiredeposition agents which can be used include the
ethoxylated amine polymers disclosed in European Patent Application 111,984,
Gosselink, published June 27, 1984; the zwitterionic polymers disclosed in
European
Patent Application 112,592, Gosselink, published July 4, 1984; and the amine
oxides
disclosed in U.S. Patent 4,548,744, Connor, issued October 22, 1985. Other
clay
soil removal and/or anti redeposition agents known in the art can also be
utilized in
the compositions herein. Another type of preferred antiredeposition agent
includes
the carboxy methyl cellulose (CMC) materials. These materials are well known
in
the art.
Suds Suppressors - Compounds for reducing or suppressing the formation of
suds can be incorporated into the compositions of the present invention. Suds
suppression can be of particular importance in the so-called "high
concentration
cleaning process" as described in U.S. 4,489,455 and 4,489,574 and in front-
loading
European-style washing machines.
A wide variety of materials may be used as suds suppressors, and suds
suppressors are well known to those skilled in the art. See, for example, Kirk
Othmer Encyclopedia of Chemical Technology, Third Edition, Volume 7, pages 430-
447 (John Wiley & Sons, Inc., 1979). One category of suds suppressor of
particular
interest encompasses monocarboxylic fatty acid and soluble salts therein. See
U. S.
Patent 2,954,347, issued September 27, 1960 to Wayne St. John. The
monocarboxylic fatty acids and salts thereof used as suds suppressor typically
have
hydrocarbyl chains of 10 to about 24 carbon atoms, preferably 12 to 18 carbon
atoms. Suitable salts include the alkali metal salts such as sodium,
potassium, and
lithium salts, and ammonium and alkanolammonium salts.
The detergent compositions herein may also contain non-surfactant suds
suppressors. These include, for example: high molecular weight hydrocarbons
such
as paraffin, fatty acid esters (e.g., fatty acid triglycerides), fatty acid
esters of
monovalent alcohols, aliphatic C 1 g-C4p ketones (e.g., stearone), etc. Other
suds
inhibitors include N-alkylated amino triazines such as tri- to hexa-
alkylmelamines or
di- to tetra-alkyldiamine chlortriazines formed as products of cyanuric
chloride with
two or three moles of a primary or secondary amine containing 1 to 24 carbon
atoms,
propylene oxide, and monostearyi phosphates such as monostearyl alcohol
phosphate
CA 02248263 2001-06-28
ester and monostearyl di-alkali metal (e.g., K, Na, and Li) phosphates and
phosphate
esters. The hydrocarbons such as paraffin and haloparaffin can be utilized in
liquid
form. The liquid hydrocarbons will be liquid at room temperature and
atmospheric
pressure, and will have a pour point in the range of about -40°C and
about 50°C, and
5 a minimum boiling point not less than about 110°C (atmospheric
pressure). It is also
known to utilize waxy hydrocarbons, preferably having a melting point below
about
100°C. The hydrocarbons constitute a preferred category of suds
suppressor for
detergent compositions. Hydrocarbon suds suppressors are described, for
example,
in U.S. Patent 4,265,779, issued May 5, 1981 to Gandolfo et al. The
hydrocarbons,
10 thus, include aliphatic, alicyclic, aromatic, and heterocyclic saturated or
unsaturated
hydrocarbons having from about: 12 to about 70 carbon atoms. The term
"paraffin,"
as used in this suds suppressor discussion, is intended to include mixtures of
true
paraffins and cyclic hydrocarbons.
Another preferred category of non-surfactant suds suppressors comprises
IS silicone suds suppressors. This category includes the use of
polyorganosiloxane oils,
such as polydimethylsiloxane, dispersions or emulsions of polyorganosiloxane
oils or
resins, and combinations of polyorganosiloxane with silica particles wherein
the
polyorganosiloxane is chemisorbed or fused onto the silica. Silicone suds
suppressors are well known in the art and are, for example, disclosed in U.S.
Patent
2.0 4,265,779, issued May 5, 1981 to Gandolfo et al and European Patent
Application
No. 354,016, published February 7, 1990, by Starch, M.S.
Other silicone suds suppressors are disclosed in U.S. Patent 3,455,839 which
relates to compositions and processes for defoaming aqueous solutions by
incorporating therein small amounts of polydirnethylsiloxane fluids.
f.5 Mixtures of silicone and silanated silica are described, for instance. in
German
Patent Application DOS 2,124,526. Silicone defoamers and suds controlling
agents
in granular detergent compositions are disclosed in U.S. Patent 3,933,672,
Bartolotta
et al, and in U.S. Patent 4,652,3!2, Baginski et al, issued March 24, 1987.
An exemplary silicone based suds suppressor for use herein is a suds
?.0 suppressing amount of a suds controlling agent consisting essentially of:
(i) polydimethylsiloxane fluid having a viscosity of from about 20 cs. to
about 1,500 cs. at 2 5°C;
(ii) from about 5 to about 50 parts per i 00 parts by weight of (i) of
siloxane
resin composed of (CH3)3Si01/2 units of Si02 units in a ratio of from
.IS (CH3)3 Si01~2 units and to Si02 units of from about 0.6:1 to about
1.2:1; and
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WO 97/32950 PCT/US97/02175
31
(iii) from about 1 to about 20 parts per 100 parts by weight of (i) of a solid
silica gel.
In the preferred silicone suds suppressor used herein, the solvent for a
continuous phase is made up of certain polyethylene glycols or polyethylene
polypropylene glycol copolymers or mixtures thereof (preferred), or
polypropylene
glycol. The primary silicone suds suppressor is branched/crosslinked and
preferably
not linear.
To illustrate this point further, laundry detergent compositions with
controlled suds will optionally comprise from about 0.001 to about 1,
preferably
from about 0.01 to about 0.7, most preferably from about 0.05 to about 0:5,
weight
of said silicone suds suppressor, which comprises ( 1 ) a nonaqueous emulsion
of a
primary antifoam agent which is a mixture of (a) a polyorganosiloxane, (b) a
resinous
siloxane or a silicone resin-producing silicone compound, (c} a finely divided
filler
material, and (d) a catalyst to promote the reaction of mixture components
(a), (b)
and (c), to form silanolates; (2) at least one nonionic silicone surfactant;
and (3)
polyethylene glycol or a copolymer of polyethylene-polypropylene glycol having
a
solubility in water at room temperature of more than about 2 weight %; and
without
polypropylene glycol. Similar amounts can be used in granular compositions,
gels,
etc. See also U.S. Patents 4,978,471, Starch, issued December 18, 1990, and
4,983,316, Starch, issued January 8, 1991, 5,288,431, Huber et al., issued
February
22, 1994, and U.S. Patents 4,639,489 and 4,749,740, Aizawa et al at column i,
line
46 through column 4, line 35.
The silicone suds suppressor herein preferably comprises polyethylene glycol
and a copolymer of polyethylene glycoUpolypropyiene glycol, all having an
average
molecular weight of less than about 1,000, preferably between about 100 and
800.
The polyethylene glycol and polyethylene/polypropylene copolymers herein have
a
solubility in water at room temperature of more than about 2 weight %,
preferably
more than about 5 weight %.
The preferred solvent herein is polyethylene glycol having an average
molecular weight of less than about 1,000, more preferably between about 100
and
800, most preferably between 200 and 400, and a copolymer of polyethylene
glycoUpolypropylene glycol, preferably PPG 200/PEG 300. Preferred is a weight
ratio of between about 1:1 and 1:10, most preferably between 1:3 and 1:6, of
polyethylene glycol:copolymer of polyethylene-polypropylene glycol.
The preferred silicone suds suppressors used herein do not contain
polypropylene glycol, particularly of 4,000 molecular weight. They also
preferably
CA 02248263 2001-06-28
32
do not contain block copolymers of ethylene oxide and propylene oxide, like
PLURONIC L l O 1.
Other suds suppressors useful herein comprise the secondary aicohols (e.g.,
2-alkyl alkanols) and mixtures of such alcohols with silicone oils, such as
the silicones
S disclosed in U.S. 4,798,679, X4,075,118 and EP 150,872. The secondary
alcohols
include the C6-C I 6 alkyl alcohols having a C I -C 16 chain. A preferred
alcohol is 2
butyl octanol, which is available from Condea under the trademark ISOFOL 12.
Mixtures of secondary alcohols are available under the trademark ISALCHEM 123
from Eruchem. Mixed suds suppressors typically comprise mixtures of alcohol +
silicone at a weight ratio of l :S to 5:1.
For any detergent compositions to be used in automatic laundry washing
machines, suds should not form to the extent that they overflow the washing
machine. Suds suppressors, when utilized, are preferably present in a "suds
suppressing amount. By "suds suppressing amount" is meant that the formulator
of
1S the composition can select an amount of this suds controlling agent that
will
sufficiently control the suds to result in a low-sudsing laundry detergent for
use in
automatic laundry washing machines.
'The compositions herein will generally comprise from 0% to about S% of
suds suppressor. When utilized as suds suppressors, monocarboxylic fatty
acids, and
salts therein, will be present typically in amounts up to about S%, by weight,
of the
detergent composition. Preferably, from about O.S% to about 3% of fatty
monocarboxylate suds suppressor is utilized. Silicone suds suppressors are
typically
utilized in amounts up to about 2.0%, by weight, of the detergent composition,
although higher amounts may gibe used. This upper limit is practical in
nature, due
2S primarily to concern with keeping costs mininuzed and effectiveness of
lower
amounts for effectively controlling sudsing. Preferably from about 0.01% to
about
1% of silicone suds suppressor is used, more preferably from about 0.25% to
about
O.S%. As used herein, these weight percentage values include any silica that
may be
utilized in combination with polyorganosiloxane, as well as any adjunct
materials that
may be utilized. Monostearyl phosphate suds suppressors are generally utilized
in
amounts ranging from about 0.1% to about 2%, by weight, of the composition.
Hydrocarbon suds suppressors are typically utilized in amounts ranging from
about
O.OI% to about S.0%, although higher levels can be used. The alcohol suds
suppressors are typically used at 0.2%-3% by weight of the finished
compositions.
3S Fabric So a er - Various through-the-wash fabric softeners, especially the
impalpable smectite clays of U.S. Patent 4,062,647, Storm and Nirschl, issued
December 13, 1977, as well as other softener clays known in the art, can
optionally
CA 02248263 2001-06-28
33
be used typically at levels of from about 0.5% to about 10% by weight in the
present
compositions to provide fabric softener benefits concurrently with fabric
cleaning.
Clay softeners can be used in combination with amine and cationic softeners as
disclosed, for example, in U.S. Patent 4,375,416, Crisp et al, March 1, 1983
and U.S.
Patent 4,291,071, Harris et al, issued September 22, 1981.
Detersive Surfactants - Nonlimiting examples of surfactants which can be
used herein in addition to the SAS particles, typically at levels from about
1% to
about 55%, by weight, include the conventional C 11-C 1 g alkyl benzene
sulfonates
("LAS") and primary, branched-chain and random C 10-C20 alkyl sulfates ("AS"),
unsaturated sulfates such as oleyl sulfate, the C 1 p-C 1 g alkyl alkoxy
sulfates
("AEXS"; especially EO 1-7 ethoxy sulfates), C l0-C 1 g alkyl alkoxy
carboxylates
(especially the EO I -5 ethoxycarboxylates), the C 10- I 8 8lYcerol ethers,
the C 1 p-C 1 g
alkyl polyglycosides and their corresponding sulfated polyglycosides, and C 12-
C 18
alpha-sulfonated fatty acid esters. If desired, the conventional nonionic and
amphoteric surfactants such as the C 12-C 18 alkyl ethoxylates ("AE")
including the
so-called narrow peaked alkyl ethoxylates and C6-C 12 alkyl phenol alkoxylates
(especially ethoxylates and mixed ethoxy/propoxy), C 12-C 1 g betaines and
sulfobetaines ("sultaines"), C 10-C I g amine oxides, and the like, can also
be included
in the overall compositions 'fhe C 10-C I g N-alkyl polyhydroxy fatty acid
amides can
also be used. Typical examples include the C ~ 2-C 1 g N-methylglucamides. See
WO
92/06154. Uther sugar-derived surfactants include the N-alkoxy polyhydroxy
fatty
acid amides, such as C 10-C 1 g N-(3-methoxypropyl) glucamide. The N-propyl
through N-hexyl C 12-C 1 g glucamides can be used for low sudsing. C 1 p-C20
conventional .soaps may also be used. If high sudsing is desired, the branched-
chain
C 10-C 1 b soaps may be used. Mixtures of anionic and nonionic surfactants are
especially useful. Other conventional useful surfactants are listed in
standard texts.
Other In~tredients - A wide variety of other ingredients useful in detergent
compositions can be included in the compositions herein, including other
active
ingredients, carriers, processing aids, dyes or pigments, etc. If high sudsing
is
desired, suds boosters such as the C 10-C 16 alkanolamides can be incorporated
into
the compositions, typically at 1 %-10% levels. The C 10-C 14 monoethanol and
diethanol amides illustrate a typical class of such suds boosters. Use of such
suds
boosters with high sudsing adjunct surfactants such as the amine oxides,
betaines and
sultaines noted above is alsa advantageous. If desired, soluble magnesium
salts such
as MgCi2, MgS04, and the like, can be added at levels of, typically, 0.1%-2%,
to
provide additional suds and to enhance grease removal performance.
CA 02248263 2001-06-28
34
Various detersive ingredients employed in the present compositions
optionally can be further stabilized by absorbing said ingredients onto a
porous
hydrophobic substrate, then coating said substrate with a hydrophobic coating.
Preferably, the detersive ingredient is admixed with a surfactant before being
absorbed into the porous substrate. In use, the detersive ingredient is
released from
the substrate into the aqueous washing liquor, where it performs its intended
detersive function.
To illustrate this technique in more detail, a porous hydrophobic silica
(trademark SIPERNAT D 10, DeGussa) is admixed with a proteolytic enzyme
li0 solution containing 3%-5% of C13_15 ethoxylated alcohol (EO 7) nonionic
surfactant. Typically, the enzyme/surfactant solution is 2.5 X the weight of
silica.
The resulting powder is dispersed with stirring in silicone oil (various
silicone oil
viscosities in the range of 500-12,500 can be used). The resulting silicone
oil
dispersion is emulsified or otherwise added to the final detergent matrix. By
this
means, ingredients such as the aforementioned enzymes, bleaches, bleach
activators,
bleach catalysts, photoactivators, dyes, fluorescers, fabric conditioners and
hydrolyzable surfactants can be "protected" for use in detergents.
The detergent compositions herein will preferably be formulated such that,
during use in aqueous cleaning operations, the wash water will have a pH of
between
:!0 about 6.5 and about 11, preferably between about 7.5 and 11Ø Fabric
laundry
products are typically at pH 9-ll 1. Techniques for controlling pH at
recommended
usage levels include the use of buffers, alkalis, acids, etc., and are well
known to
those skilled in the art.
The following illustrates free-flowing SAS particles which are prepared by the
s 5 process of this invention with the indicated ingredients. In Examples I
and II, the
ingredient abbreviations refer to the following materials: C16SAS is a
secondary
(2,3) alkyl sulfate surfactant with an average of 16 carbon atoms; C45AS (or
ASC14-C15) is a primary alkyl sulfate surfactant with an average of 14-15
carbon
atoms; AE (C4~-7) is an alcohol ethoxylate surfactant having an average of 14-
15
?~0 carbon atoms and an average of 7 ethoxy units; LAS (C 12) is an alkyl
benzene
sulfonate surfactant with an average of 12 carbon atoms in the alkyl chain;
Metoiose
is the trade mark of methyl cellulose ethers manufactured by Shin-etsu Kagaku
Kogyo K.K., and is available as Metolose SM15, SM100, SM200 and SM400, all of
which are useful herein; the hydrophobic silica has a particle size in the
range of from
~~5 about 1 to about 5 micrometers, and is available as SIPERNAT D 10 from
Degussa;
the Zeolite A has a particulate size in the 0.5-10 micrometer range; the
polyacrylate
has a molecular weight in the range from about 2000 to about 6000; the soil
release
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WO 97/32950 PCT/US97/02175
polymer is an anionic polyester; see, for example, patents to Maldonado and
Gosselink, et al., cited above; the balance of the abbreviated ingredients are
as
defined hereinabove.
EXAMPLE I
5 Process to Prepare SAS Particles with Enhanced Solubili~ via a Kneadinr~/
Extruding_process
The following describes the experimental procedure applicable to produce
highly soluble, high active, SAS containing surfactant particles using a pilot
kneader,
an extruder, and a Lodige mixer.
10 Step (a) - 833 Grams of commercial C 16SAS powder is pre-mixed with other
powder formed detergent ingredients in a batch kneader (KDHJ-10, 6 liter, Fuji
Powdal) for 5 minutes. The Additional Ingredients mixed with the SAS are as
follows:
Ingredient Grams
15 C45AS surfactant flake 1 i 63
Soap, Na tallow 300
SKS-6 900
Poiyacrylate 500
Sodium carbonate 1150
20 Soil release polymer 56.8
Brightener mixture* 23.3
Polyvinyl alcohol 17.3
*Conventional brighteners such as the various TINOPAL materials may be used.
See
Example II.
25 Step (b) - 920 Grams of a neutralized oleoyi sarcosinate paste with 18%
moisture is then charged into the batch kneader while mixing. Mixing is
continued
for another 15 minutes to form a detergent dough.
Step (c) - The detergent dough is then charged into a Twin-Dome Gran
extruder (TDG-110, Fuji Powdal). The diameter of the extruder opening is about
30 500 microns. The collected detergent noodles have an average length of
100~m
15.0 cm.
Step (d) - 2,000 Grams of the noodle from Step (c) and 5 grams of powdered
silica are charged into a Marumerizer (Q-400, Fuji Powdal) and mixed for 30
seconds. An additional 5 grams of powdered silica are added and mixed for
another
35 60 seconds. This step shortens the length of the noodles to produce a
granule with
an average particle size about 1-2 mm.
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WO 97/32950 PCT/US97/02175
36
Step (e) - 11,569 Grams of the granule obtained from Step (d) are charged
into a Lodige 50 L KM-mixer while operating. 217 grams of C45AE7 nonionic
binder at 70°C is sprayed onto the granule . 1,118 grams of dry,
detergent grade,
Zeolite A is charged into the mixer and mixing is continued for 9 more
minutes. 43
grams of perfume is then optionally sprayed onto this granule.
Step (f) - The granules obtained from Step E are sieved through a #14 mesh
Tyler screen { 1180 microns) to collect the desired particles.
The following illustrates a granular detergent prepared in the manner of the
present invention, comprising SAS particles with improved solubility.
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37
EXAMPLE II
Ingredient
Surfactant Particle % Total Formulation
ywt.)
SAS(C 16) 11.7
AS(C 14-15) 12.3
AE(C45-7) 1.7
LAS(C I2) 1.7
Oleoyl Sarcosinate 10.0
Tallow Na Soap 4. S
41.9
Builder/Alkalinity
SKS-6 I 3.4
Polyacrylate 8.4
Zeolite A 8.5
PEG 4000 1.9
Na2C03 17.1
49.3
Minors
Metolose 0.84
FWA15 Tinopal AMS-GX** 0.11
FWA49 Tinopal CBS-X** 0.23
Hydrophobic silica 1.11
PVP 0.08
Perfume 0.33
Moisture 4.0
Misc. 2.1
8.8
Total 100.0
*Includes coating on SAS/surfactant particles.
**Optical Brighteners.
Physical Properties
Density(g/L) 760
Mean Particle Size(microns) 586
The foregoing composition is free-flowing, has quite acceptable dusting
and caking grades, and is intended for use even under cold wash conditions.
SAS particles prepared in the foregoing manner are used to provide
fully-formulated detergent compositions, as illustrated by the following, non-
limiting
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WO 97/32950 PCT/US97102175
38
Examples. In
Examples III-X,
the overall
weight percent
of the ingredients
is listed
in the vertical
columns.
EXAMPLE
III-X
Ingredient* III IV V VI VII VIII IX X
Surfactants
C 16 SAS 11. 10 15 8 15 10 15 8
7
C14 SAS 0 S 0 8 0 10 S 8
C 18 SAS 0 0 3 0 0 0 0 0
C45 AS I2.3 0 0 10 15 6 0 5
C45 AExS 0 0 5 0 S 0 0 0
Coconut AS 0 10 0 0 0 0 0 0
C 12 LAS 1. 0 7 0 3 0 6 3
7
C 13 LAS 0 0 5 0 0 0 0 0
C46 AOS 0 0 0 5 0 0 15 0
C68 MES 0 10 0 5 0 15 0 15
C46 AGS 0 0 3 0 0 0 3 0
Hydroxyethyl
mono-
dodecyl quat 0 0 0.5 0 1 0 1 0
Trimethyl alkyl
quat 0 I 0 1 0 0 0 0
Tallow soap 4.5 3 0 0 6 2 0 2
Coconut soap 0 2 0 0 0 0 0 0
Oleate soap 10 4 3 S 0 0 4 0
Neodol C45 E7 1.7 0 0 2 3 0 2 3
Neodol C23 E6.50 0 0 0 0 2 0 0
Neodol C25 E9 0 2.5 2 0 0 0 0 0
Coconut acyl
glucamide 0 0 3 5 0 3 3 0
Acyl monoethanol-
amide 0 0 2 0 1 0 0 0
Acyl diethanol-
amide 0 0 0 2 0 0 0 0
SaltsBuilder
Layered silicate 0 S 11 5 5 25 18
11.8
Zeolite A 8.5 10 0 10 5 0 5 10
Zeolite X 0 0 10 0 0 7 0 0
Polyacrylate 8.4 0 10 0 2 1 0 5
Na
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WO 97/32950 PCT/US97I02175
39
Copolymer of
acrylate/maleate0 12 0 0 0 3 5 0
NTA 0 0 0 0 5 0 0 0
STP 0 0 0 0 5 16 0 0
PEG 4000 1.9 0 4 1 1 2 1 1
Soda Ash 10.8 11 10 10 8 5 0 10
Powdered hydro-
phobic silica 0.8 1 0 1 0.8 1 1 1
Sodium perborate4.5 0 0 0 0 0 0 0
Sodium per-
carbonate 0 5 0 0 5 0 0 0
NOBS 4.5 2 0 0 5 0 0 0
TAED 0 3 0 0 0 0 0 0
Sodium sulfate1 3 5 8 2 5 2 3
DTPA 0 0 0 0 0 0 0 0
EDDS 0 0 1 0 0 0 0 0
EDTA 0 0 0 1 0 0 0 0
Others
Perfume 0.3 0.3 0.3 0.2 0.2 0.2 0.3 0.2
Soil release
polymer 1 0 0 0 1 0 1 1
Brighteners 0.4 0.3 0.4 0 0.5 0.4 0.6 0.3
Polyvinyl Alcohol
or PVNO 0.1 0 0 2 0 0 0 0.2
Moisture Balance
Total: 100 100 100 100 100 100 100 100
*In the Examples III-X, the abbreviations used for the Ingredients appear
hereinabove in the listing of Formulation Ingredients, or are as defined
hereinafter.
C45AExS is C 14-C 1 S alcohol ethoxylate (1-3) sulfate.
C46AOS is C 14-C 16 alpha olefin sulfonate.
C68MES is C 16-C 1 g methyl ester sulfonate.
C46AGS is C 14-C 16 alkyl glycerol sulfate.
Hydroxyethyl monododecyl quat is hydroxyethyl dodecyl dimethyl ammonium
chloride.
Trimethyl alkyl quat is dodecyl trimethyl ammonium chloride.
The NEODOLS are commercial nonionic surfactants.
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WO 97/32950 PCT/US97/02175
Coconut acyl glucamide is coconutaikyl N-methyl glucamide.
Acyl monoethanolamide is coconutaikyl monoethanoiamide.
Acyl diethanolamide is coconutalkyl diethanolamide.
Layered silicate is SKS-6.
5 Polyacrylate, Na has a molecular weight of 2000-6000.
Copolymer of acrylate/maleate has a molecular weight of 2000-20,000.
STP is sodium tripolyphosphate.
Soil release polymer is an anionic polyester; see Maldonado and Gosselink and
other
patents cited above. METOLOSE can also be used.
10 Brighteners are TINOPALS~, available from Ciba-Geigy.
The foregoing compositions are prepared by dry-blending the SAS particles
herein with the balance of the ingredients. The compositions are used ac
fahrir
laundry detergents, at conventional usage ranges from about 500 ppm to 50,000
ppm
in aqueous media. The compositions exhibit excellent cleaning performance,
15 especially in compositions where the size of the SAS particles (i.e.,
largest diameter
of the particles) is in the 100_- 2000 micrometer range. The C 16SAS is
especially
preferred.
