Note: Descriptions are shown in the official language in which they were submitted.
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C-4772
HARD SURFACE CLEA~ING COMPOSITIOl!~
BACKGROI~ND OF THE INVE~TI ON
T~is in~ention relates to a cleaniny composition,
and more partlcularly to a stable composition having excel-
lent cleaning properties for hard surfaces.
Various formulations o~ detergent compositions
containing chlorinating agents, detergent builders, sur-
actants and fillers are well-known in the art. For example,
U. S. 3,816,320 discloses a dlshwashing composition contain-
ing sodium dichloroisocyanurate dihydrate, an alkali metal
silicate, a detergent builder and water softener, a nonionic
surface active agent and a filler. While sui-table for dish-
washing, this formulation would be ineffective for applica-
tions where greasy soil removal from large areas at ambient
temperatures is desirable.
~: -
Other compositions employ the dehydrated formof the isocyanurate in complex formulations designed for
specialized purposes. Thus, U. S. 3,360,469 and 3,361,675
describe dry compo:itions containing a variety of compon-
ents but indiFate problems in dry-bIending such compositions.
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C-4772
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These patents taach the use of certain compacted sodium
tripolyphosphate and granular sodium tripolyphosphate in
these compositions. In U. S. 3,645,390, a cleansr paclc-
age for a diazo copying machine roll is disclosed w~ich
contains potassium dichloroisocyanurate and a liquid
water soluble wax solvent in combination with other in-
gredients.
The problems inherent in formulations contain-
ing chlorinating agents are emphasized in U. S. 3,364,146
which is directed to the use of a crystalline, anhydrous
monopotassium dichlorocyanurate having a certain crystal-
line form. Furthermore, U. S~ 3,287,359 teaches complex
metal dichlorocyanurates while U. S. 3,6g1,082 discloses iso-
cyanurates stabilized by substituted hydrocarbon radicals.
Sill another approach to formulating a satisfactory cleaning
composition is described in U. S. 3,679,589 in which a
specific alkoxylated melamine is employed in a formulation
containing a chlorinating agent.
Surprisingly, there is still a need for a stable
hard surface cleaner having good soil dispersion properties,
emulsifier properties, bleaching and disinfecting properties.
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SUMMARY OF T~IE INVE~TIO~
Now it has been found in accordance with this
invention that a hard surface cleaner containing sodium
dichloroisocyanurate dihydrate, an inorganic alkali
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metal condensed polyphosphate, an alkal1 metal silicate,
and both a nonionic and an anionic surface active agent
obviatas the dl~ficu].ties inherent in the prior art~;
compositlons. Since anionic surfactants generally result
in an unstable formulation when combined with a chlor- .~
inating agent, it is a surprising feature of this ~;
invention that the above composition can be formulated
into a stable hard surface cleaner.
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DETAILED DESCRIPTION OF THE INVE~l~ION
; - ~ More partlcular~ly, the hard surface cleaner of
this invention consists essentially of from about 0.lO
to about 5.00/O by weight sodium dichloroisocyanurate di-
hydrate1 from about lO to about 60% by weight of an
:inorganic alkali metal condensed phosphate; from about
5 to about 500/O by weight of an alkali metal sili.cate;
from about O.l to about 6% by weight of a low-foaming
nonionic surface active agent, from about O.l0 to about
15% by weight~of an anionic surface active agent; and
from~about O to about 70~/O by weight of a filler.
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~ C-4772
As previously indicated, sodium dichloroisocyan-
urate dihydrate is a known compound, being described in
the aforementioned U.S. 3,816,320.
The inorganic alkali metal condensed phospha~e employed
in this invention includes any appropriate soluble alkali
metal phosphate suitable for use in cleaning compositions.
By the term " condensed phosphate" in the claims and
specification herein is meant a polymeric material formed
by the combination of molecules of orthophosphate.
Sodium tripolyphosphate, trisodium phosphate, tetrasodium
pyrophosphate, sodium hexametaphosphate sodium pyrophos-
phate, and the corresponding potassium phospha-tes are ex-
emplary. Sodium tripolyphosphate and sodium hexameta-
phosphate are preferred.
Suitable alkali metal silicates which can be employed
in the practice of this invention include both anhydrous
forms and those containing up to about 25% water. Typical
are sodium metasilicate anhydrous, sodium me-tasilicate
. i
5-hydrate, potassium metasilicate, sodium orthosilicate
anhydrous, etc.
The low-foaming nonionic surface active agents
useful in the formulation of this invention are synthetic
detergents containing a polyoxyethylene group reacted
with an organic hydrophobic compound such as polyoxy-
propylene~ aliphatic and aromatic alcohols, the reaction
product o propylene oxide and ethylene diamine, etc.
Generally these materials are condensation products of
C-4772
6-30 moles of ethylene oxide with 1 mole of the hydro-
phobic compound and may be either capped or uncapped.
Typical are the condensation products of ethylene oxide
with alkyl phenols, commercially known as "Triton"
suxfactants; condensation products of ethylene oxide with~ ;~
aliphatic alcohols having 12-18 carbon atoms such as those
surfactants sold commercially as "Tergitol 15-S-9",
"Surfonic J-4", etc.
The anionic surface active agents are water-soIuble
salts of organic sulfuric acid reaction products con-
taining from about 8-18 carbon atoms. Typical are the
soaium and potassium alkyl benzene sulfonates suoh as
sodium dodecyl benzene sulfonate, sodium tridecyl benzene
sulfonate, sodium alkyl sulfonates and sulfates obtained ~
b~ sulfonation of tallow or coconut fatty alcohols and r
mixtures of alkyl phosphates, sodium or potassium salts
of sulfosuccinic acid, etc.
As a filler, it is preferred to employ alkali
metal carbonates such as sodium carbonate and potassium
carbonate. These materials may be used alone or in com-
bination with such inert fillers as sodium chloride, sodium
sulfate, etc~
Minor amounts of compounds such as perfumes, powder~
ing matter, etc. can also be employed in the compositions
of this invention.
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~ 8 C-4772
In formulating the compositions of this invention,
it is preferred to charge the powders, that is the
inorganic alkali metal condensed phosphate and any filler,
to a mixing container such as a blender. The nonionic
surface active agent is added and the components mixed
until the nonionic is absorbed into the dry ingredients.
The anionic surfact active agent is then mixed in,
followed by the sodium dlchloroisocyanurate dihydrate,
and the final composition blended to a uniform m~xture.
As previously indicated, the composition of this
invention is an excellent hard surface cleaner. By
hard surface cleaner is meant a cleaner suitable for use
on non-porous surfaces such as stainless steel walls,
holding tanks, pipes, etc. The cleaner is qenerally
dissolved in water to the desired concentration which
is 1/3 ounce to 1 ounce per gallon of water, depend-
ing upon soil and water conditions. The formulation is
an alkaline, chlorinated general cleaner. It is
suitable for use in dairies, beverage plants, breweries
and all food processing plants for cleaning of equipment,
floors and walls. It can be used both as a manual
cleaner and in high pressure equipment when more wetting
~ is desirable.
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~ Z ~ C-4772
While all compositions within the scope of this
invention have highly desirable properties, it is preferred to
to employ compositions consisting essentially of from about
.5 to about 3.5% by Weight sodium dichloroisocyanurate
dihydrate, from about 15 to about 35% by weight of an
inorganic alkali metal condensed phosphate from about
5 to about 25% by weight of an alkali metal silicate;
from about .5 to about 40O/o by weight of a low foaming nonionic
surface active agent, from about 0.5 to about 5% by weight
of an anionic surface active agent; and from about 35 to
about 65% by weight of a filler.
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The following examples wlll serve to illustrate
the practice of this lnvention.
EXAMPLE 1
A hard surface cleaner ha~ing the following com~
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position was prepared:
Percent by Weight
Sodium dichloroisocyanurate
dihydrate 1.5 ;
Sodium tripolyphosphate25.0
Sodlum metasllicate (Anhydrous) 15.0
Tergltol 15-S-9 1) 2.0
Sodlum dodecylbenzene sulfonate 2.0
.
Sodium carbonate ~ ~ 54.5
1) Tergitol 15-S-9, available from Union Carbide
Corporation, is an ethoxylated alcohol having an
average molecular weight of 15 carbon atoms and
containing about 9 moles of ethylene oxide.
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~ C-4772
The cleaner was formulated by adding the sodium
carbonate and sodium tripolyphosphate to a blender.
The Tergitol 15-S-9 was then added and the components
mixed until the Tergitol 15-S-9 was absor~ed into the
dry ingredients. Then the sodium dodecylbenzene sulfonate
was added and mixed into the components in the blender.
Finally the sodium dichloroisocyanurate dihydrate was
added and the resulting composition blended to a inal
uniform mixture.
A cleaning solution employing 1/2 ounce of the com-
position of this Example per gallon of water was made
and found to be extremely effective in cleaning a 314 stain- ;
less steel plate covered with dried milk residues.
Examples 2-4
.
~ mploying the ingredients and proportions set forth
in the Table below, and following the procedure of Example
1, three cleaning formulations were prepared. All were
found to be effective when used to clean milk residues
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as descrlbed in Example 1. ~ ~
C-4772
_ _ TABLE _____ _ __ _
Percent by Wei~
In~redients 2 3 4
Sodium dichloroisocyanurate
dihydrate 2.0 1.5 2.5 ~
Sodium tripolyphosphate20.0 25.0 15.0 ~;
Sodium hexametaphosphate14.0 ---- ---- ;
Sodium metasilicate
(Anhydrous) 25.0 15.0 20.0
Triton DF-16(~ ---- 2.0
Tergitol 15-S-9 1.0 2.0 -----
Sodium dodecylbenzene sulfonate3.0 2.0 0.5
Sodium carbonate 35.0 48.5 60.0
Sodium sulfate ---- 6.0 ---- `~
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(1~ Triton DF-16 is a capped ethoxylated alcohol available
from Rohm ond Haas Company.
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