Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
WO 96102600 {~ r~ '~'' ' ' ~ ~ ~:a PCTIUS95/08627
219b073
WATER BASED PAINT PROTECTANT
FIELD OF TH~ INVENTION
This invention relates to a protective composition
suitable for use on painted surfaces, and in particular
on cars.
BACKGROUND OF THE INVENTION
Many different types of automotive protectants are known
in the art. For example, many different paste and
liquid waxes are known. These products are applied to
a clean surface and are rubbed or buffed to give a
protective finish to the car. Such products generally
require a minimum of 45 to 90 minutes for one person to
apply, depending on the size of the car, and the
application of a physical "buffing" force.
To pvercome these disadvantages, several silicone-based
treatments are on the market, such as °ZOIEG",
"WATERLESS CAR WASH" AND "NEW FINISH". These products
are organic solvent-based solutions of various
silicones. These products relied upon high levels of
solvents and abrasives to provide uniform film levels
of silicone. These products generally do not show
enhancement of color or gloss, and do not provide
significant durability.
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Thus it is an obj ec~ t~f~ ;the 'invention to provide an easy
to apply, water-based protectant which enhances color,
gloss and durability of an automotive painted surface. '
SUMMARY OF THE INVENTION
The invention provides an aqueous protective composition
comprising emulsified silicone, an evaporation modifier,
and a dynamic surface tension reducer, dispersed in
water.
In one aspect, the emulsified silicone comprises
l0 dimethyl silicone, amino-functional silicone, and
silicone resin, emulsified in water.
The invention also provides methods for protecting an
automotive painted surface. The method comprises
applying an aqueous protective composition to the
automotive painted surface and wiping the surface to
spread and dry the protectant.
DETAILED DESCRIPTION OF THE INVENTION
Typically, the desirable properties of a automotive
protective composition are the enhancement of color,
gloss and durability, as well as ease of application.
The present invention provides such an aqueous
protective composition comprising emulsified silicone,
an evaporation modifier, and a dynamic surface tension
reducer, dispersed in water.
By "emulsi:fiedysilicone" herein is meant an emulsion of ,
one or more derivatized or underivatized silicone
compounds such as dimethyl-containing silicones, amino-
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functional silicones, and silicone resins. Preferably
the emulsified silicone is a mixture of dimethyl
silicone, amino-functional silicone, and silicone resin.
The dimethyl silicone contributes the gloss and slip of
the finish, i.e. the silky feel of the protectant. The
amino-functional silicone deposits on or reacts with the
painted surface, such that the silicone layer is firmly
retained on the surface (e. g. by covalent or non-
covalent bonding) and will not wash off easily. This
contributes to the durability of the protectant. The
silicone resin acts as a solidifier, to give the
silicone layer more body,, less mobility (i.e. such that
it will not wipe off);, and greater durability.
In the preferred embodiment, the range of acceptable
molecular weights for the silicones is from about 500
_ to about 30,000. Generally, the higher the molecular
weight of the silicone, the more wax-like properties are
imparted, such as higher gloss, color enhancement,
water-beading and durability. However, when the
molecular weight is too high, the silicone becomes
similar to conventional waxes with their attendant
problems, such as difficulty of application.
In addition, amino-functional silicones vary in the
number of derivatized amine groups. In the preferred
embodiment, mid-level base equivalent amino-functional
silicones are used.
Preferably, the emulsified silicone is dispersed in
water, although some embodiments utilize other aqueous
carriers.
The emulsified silicone ranges from about 15% to about
75% solids, with about 50% solids being preferred.
. .
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Accordingly, the dimethyl silicone can range from about
0% to about 100% of the solids in the emulsion, with
about 20% to about 95% being preferred, and 89% being
the most preferred. That is-, in an emulsion that is 50%
solids, dimethyl silicone provides 44.5% solids. The
amino-functional silicone comprises from about 0% to
about 100% of the solids in the emulsion, with about 1%
to 10% being preferred, and 7% being the most preferred.
That is, in an emulsion that is 50% solids, amino-
functional silicone provides 3.5% solids. The silicone
resin ranges from about 0% to about 20% of the solids
in the emulsion, with about 0.05% to 10% being
preferred, and 4.0% being the most preferred. That is,
in an emulsion that is 50% solids, silicone resin
provides 2% solids.
The silicone emulsion also contains a sufficient amount
of one or more emulsifiers to maintain the silicone in
emulsified form. Suitable emulsifiers include octyl
phenol ethoxylate. It is desirable for the emulsion to
have a proper hydrophilic-lipophilic balance (HLB). The
desired HLB ranges from about 12.5 to about 14.5, with
a preferred HLB of 13.4. This HLB is achiedved using
nn octylphenol ethoxylate with an HLB of 8 and another
one with an HLB of 18, with the percentage in the
formula being 2.5 and 3, respectively. In one
embodiment, the emulsifier in the emulsified silicone
is of sufficient amount to allow the entire protective
composition to be an emulsion; i.e. once formulated in
the composition, the silicone is still emulsified. In
alternative embodiments, the emulsifier does not cause
the silicone in the protective composition to remain
emulsified, and thus the silicone may settle out over
s
time. In this embodiment, the composition is shaken or
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stirred to evenly disperse the silicone solids within
the composition prior to application.
_,
The silicone emulsion ranges from about 2% to about 6%
' by weight in the protective composition, with about 2%
to about 4% being preferred, and about 3.0% being the
most preferred.
By "evaporation modifier" herein is meant a compound
which modifies the rate of evaporation of the aqueous
phase of the protective composition. If the rate of
evaporation is too rapid, the composition will harden
as it is applied, without allowing time for wiping and
spreading. This results in the silicone layer being
uneven and irregular. Similarly, the rate of
evaporation cannot be too slow, since this allows drips
_ 15 to form, and dust and other debris to lodge in the
silicone layer, detracting from the gloss and shine and
leaving a smeary surface which may streak. Generally,
the evaporation modifier must allow the applied
composition to remain liquid and spreadable for at least
about 1 minute, yet dry within about 3 minutes. In the
absence of an evaporation modifier, the composition
typically dries in about 15 seconds, depending on the
environmental temperature and the temperature of the
surface.
In some embodiments, the evaporation modifier will
increase the evaporation rate. In other embodiments,
the evaporation modifier will retard the evaporation
rate. For example, if the dynamic surface tension
reducer used in the composition increases the rate of
evaporation of the composition, an evaporation modifier
which retards the rate of evaporation will be used.
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In addition, the evaporation modifier must not
significantly alter the solubility of the silicone in
the composition. If the solubility of the silicone is
significantly increased, the silicone layer will wipe
off, causing irregularities in the silicone layer and
a loss of protection. Similarly, the solubility of the
silicone should not be decreased by the evaporation
modifier, since this also results in a loss of
protection.
In one embodiment, the evaporation modifier is a glycol
ether. In a preferred embodiment, the evaporation
modifier is either propylene glycol phenyl ether or
ethylene glycol phenyl ether. Propylene glycol phenyl
ether is particularly preferred, since it results in
high gloss and depth of color of the painted surface.
The evaporation modifier ranges from about 0.5% to about
3.5% by weight in the protective composition, with about
1% to about 3% being preferred, and about 2.0% being the
most preferred.
By "dynamic surface tension reducer" herein is meant a
compound which reduces the rate at which a low surface
tension is achieved, in comparison to the compound
without such reducer. A low surface tension of the
protective composition is necessary to wet the surface
and promote spreadability, thus avoiding the formation
of beads or drops on the surface. While silicone
compounds generally do have low surface tension, they
are very slow to spread due to their high viscosity.
Accordingly, a dynamic surface tension reducer is
necessary to increase the spreading of the composition
on the surface. Generally, in the absence of a dynamic
surface tension reducer, the spray application of the
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protective composition results in droplets or beads
-being deposited on the surface. Accordingly, the
addition of the dynamic surface tension reducer causes
the spray application of the composition to be a
continuous and uniform sheet on the surface. However,
the amount of the dynamic surface tension reducer should
be adjusted such that the composition does not
significantly run or drip prior to wiping.
Similar to the evaporation modifier, the surface tension
reducer will not significantly alter the solubility of
the silicone.
In a preferred embodiment, the dynamic surface tension
reducer comprises n-octyl pyrrolidone. Other dynamic
surface tension reducers include sarcosinates and
dimethyl hexynol type materials.
The dynamic surface tension reducer ranges from about
0.05% to about 0.5% by weight in the protective
composition, with about 0.05% to about 0.3% being
preferred, and 0.10% being the most preferred.
The amount of water in the protective composition ranges
from about 90o to about 98% (e. g., 97.450) by weight,
with about 90o to about 96o being preferred, and
94.90° being the most preferred.
Preferably, the protective composition of the present
invention is essentially free of abrasives, such as
silicas, silicates, kaopolite or celite, normally found
in silicone based protectant products, nor volatile
organic compounds or solvents.
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Also the foregoing protectants may be loaded into
aerosol or pump spray dispensers known in the art. In
some embodiments, additional ingredients are added to
the composition to facilitate aerosol application, also
as is well known in the art. '
The composition may be applied to any automotive painted
surface. The surface may be clean, dirty, new or
moderately oxidized. The surface may be cool or hot.
The protective composition of the present invention may
be applied in a variety of ways. In a preferred
embodiment, the composition is applied by aerosolization
or pump spraying. However, the composition may be
applied as a liquid as well. Generally, the composition
is applied to portions of the surface at a time, to
prevent the composition from drying before wiping.
As soon as the composition is applied, the surface is
preferably wiped, preferably using a clean dry cloth,
to spread the composition as uniformly as possible. The
surface is then rewiped lightly to dry, again preferably
using a clean, dry cloth.
When applied in this manner, the protective composition
protects and beautifies the painted surfaces of a car
without smearing or streaking. It provides a high gloss
on the surface, and enhances the color of the surface.
It provides a durable, water beading surface.
Durability is measured by the water-beading capabilities
of the surface over time. A loss of shine may also
indicate a loss of protectant.
The following examples serve to more fully describe the
manner of using the above-described invention, as well
WO 96102600 219 6 ~ 7 3 p~/pS95108627
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as to set forth the best modes contemplated for carrying
out various aspects of the invention. It is understood
that these examples in no way serve to limit the true
scope of this invention, but rather are presented for
' 5 illustrative purposes.
Example.l
Preparation of a Protective Composition
A typical formulation of a protective composition is as
follows: ,
Ingredient Amount (~ by wt.)
propylene glycol phenyl 2.00
ether
n-octyl pyrrolidone 0.10
Emulsified silicone: 3.00 total
a) dimethyl silicone 2.6~
b) amino-functional
silicone 0.21
c) silicone resin 0.12
water 94.90
The propylene glycol phenyl ether was obtained from DOW.
The n-octyl pyrrolidone was obtained from ISP. The
dimethyl silicone was "WS101", obtained from Wocker,
Inc. The amino-functional silicone was "F784" or
"F785", obtained from Wocker, Inc. The silicone resin
was "VP1038", obtained from Wocker, Inc.
The composition was made as follows. First the
emulsified silicone was made. This was done by blending
' the silicones, resins and surfactants together. The
water was slowly added with non-shear aggitation, with
mixing after all the water was added. T
ypical emulsions
had a particle size of 150~C to 350, and preferably were
in the 230 to 300~a size.
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The composition was applied via either pump spraying or
aerosolization to a variety of automotive painted
surfaces under various conditions, including clean,
dirty and moderately oxidized surfaces. In addition,
the composition was applied both in full sunlight as
well as in shade.
After application, a clean, dry cloth was used to spread
the composition evenly. Then the surface was rewiped
gently to dry the composition.
The treatment resulted in high gloss and color
enhancement, with actual durability exceeding 4 weeks.
