US 5,929,162 AGranted

Elastomer dispersion having a unique particle size distribution

AssigneeGeneral Electric Company

InventorsAdam J. Horne, Donald S. Johnson, John A. Kilgour, Richard D. Wang

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Abstract

A composition comprising the hydrosilylation addition product of a linear alkenyl functionalized polyorganosiloxane and an M.sup.H Q resin and a low molecular weight silicone when subjected to a new particle size reduction process that includes flow induced shearing provides for components in personal care formulations that have improved spreadability and substance as a consequence of a unique particle size distribution.

Claims20

Dependent claims

A silicone composition comprising:

(A) a silicone formed by the hydrosilylation product of
(1) a linear alkenyl stopped polyorganosiloxane having the formula:
M.sup.vi.sub.a D.sub.x D.sup.vi.sub.y M.sub.2-a
where the subscript x is a number greater than 500, the subscript y is a number ranging from zero to about 20, the subscript a is a number ranging from 0 to 2, subject to the limitation that a+y is within the range of from 1 to about 20, with M.sup.vi defined as:
R.sup.1 R.sup.2 R.sup.3 SiO.sub.1/2
where R.sup.1 is a monovalent unsaturated hydrocarbon radical having from two to ten carbon atoms, and R.sup.2 and R.sup.3 are each independently one to forty carbon atom monovalent hydrocarbon radicals, with D defined as:
R.sup.4 R.sup.5 SiO.sub.2/2
where R.sup.4 and R.sup.5 are each independently one to forty carbon atom monovalent hydrocarbon radicals, with D.sup.vi defined as:
D.sup.vi =R.sup.6 R.sup.7 SiO.sub.2/2
where R.sup.6 is a monovalent unsaturated hydrocarbon radical having from two to ten carbon atoms, and R.sup.7 is independently a one to forty carbon atom monovalent hydrocarbon radical with M defined as:
M=R.sup.8 R.sup.9 R.sup.10 SiO.sub.1/2
with R.sup.8, R.sup.9, and R.sup.10 each independently a one to forty carbon atom monovalent hydrocarbon radical;
and
(2) a resin having the formula:
(M.sup.H.sub.w Q.sub.z).sub.j
where Q has the formula SiO.sub.4/2 and with M.sup.H defined as:
H.sub.b R.sup.11.sub.3-b SiO.sub.1/2
where R.sup.11 is a one to forty carbon atom monovalent hydrocarbon radical where the subscript b is a number ranging from 1 to 3, with the subscripts w and z having a ratio of 0.5 to 4.0 respectively and the subscript j ranges from about 2.0 to about 100;
wherein said hydrosilylation is conducted in the presence of
(3) a first silicone having a viscosity below about 1,000 centistokes at 25.degree. C.;
thereby forming a gel having an ASTM D-2240-91 Durometer hardness of at least 5;
and
(B) a second silicone having a viscosity below about 1,000 centistokes at 25.degree. C. wherein said gel is slurried in said second silicone and subjected to mixing with said second silicone;
producing thereby a uniform liquid comprising said second silicone and said gel whereby said uniform liquid has a viscosity ranging from 500 to 150,000 centistokes at 25.degree. C., said uniform liquid having an initial average particle size of said gel and a particle size distribution of said gel and
a) subjecting said uniform liquid to a pressure;
b) subjecting said uniform liquid to a pressure drop through an orifice whereby said uniform liquid passes through said orifice wherein the initial average particle size of said gel is reduced;
and
c) repeating steps a) and b) whereby said particle size distribution of said gel is controlled and comprises
d) a local maximum ranging from about 21 to about 26 microns;
e) a local maximum ranging from about 33 to about 38 microns;
and
f) a local maximum ranging from about 50 to 60 microns.

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Dependencies are inferred from the claim text.

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Abstract

A silicone composition comprising:

(A) a silicone formed by the hydrosilylation product of
(1) a linear alkenyl stopped polyorganosiloxane having the formula:
M.sup.vi.sub.a D.sub.x D.sup.vi.sub.y M.sub.2-a
where the subscript x is a number greater than 500, the subscript y is a number ranging from zero to about 20, the subscript a is a number ranging from 0 to 2, subject to the limitation that a+y is within the range of from 1 to about 20, with M.sup.vi defined as:
R.sup.1 R.sup.2 R.sup.3 SiO.sub.1/2
where R.sup.1 is a monovalent unsaturated hydrocarbon radical having from two to ten carbon atoms, and R.sup.2 and R.sup.3 are each independently one to forty carbon atom monovalent hydrocarbon radicals, with D defined as:
R.sup.4 R.sup.5 SiO.sub.2/2
where R.sup.4 and R.sup.5 are each independently one to forty carbon atom monovalent hydrocarbon radicals, with D.sup.vi defined as:
D.sup.vi =R.sup.6 R.sup.7 SiO.sub.2/2
where R.sup.6 is a monovalent unsaturated hydrocarbon radical having from two to ten carbon atoms, and R.sup.7 is independently a one to forty carbon atom monovalent hydrocarbon radical with M defined as:
M=R.sup.8 R.sup.9 R.sup.10 SiO.sub.1/2
with R.sup.8, R.sup.9, and R.sup.10 each independently a one to forty carbon atom monovalent hydrocarbon radical;
and
(2) a resin having the formula:
(M.sup.H.sub.w Q.sub.z).sub.j
where Q has the formula SiO.sub.4/2 and with M.sup.H defined as:
H.sub.b R.sup.11.sub.3-b SiO.sub.1/2
where R.sup.11 is a one to forty carbon atom monovalent hydrocarbon radical where the subscript b is a number ranging from 1 to 3, with the subscripts w and z having a ratio of 0.5 to 4.0 respectively and the subscript j ranges from about 2.0 to about 100;
wherein said hydrosilylation is conducted in the presence of
(3) a first silicone having a viscosity below about 1,000 centistokes at 25.degree. C.;
thereby forming a gel having an ASTM D-2240-91 Durometer hardness of at least 5;
and
(B) a second silicone having a viscosity below about 1,000 centistokes at 25.degree. C. wherein said gel is slurried in said second silicone and subjected to mixing with said second silicone;
producing thereby a uniform liquid comprising said second silicone and said gel whereby said uniform liquid has a viscosity ranging from 500 to 150,000 centistokes at 25.degree. C., said uniform liquid having an initial average particle size of said gel and a particle size distribution of said gel and
a) subjecting said uniform liquid to a pressure;
b) subjecting said uniform liquid to a pressure drop through an orifice whereby said uniform liquid passes through said orifice wherein the initial average particle size of said gel is reduced;
and
c) repeating steps a) and b) whereby said particle size distribution of said gel is controlled and comprises
d) a local maximum ranging from about 21 to about 26 microns;
e) a local maximum ranging from about 33 to about 38 microns;
and
f) a local maximum ranging from about 50 to 60 microns.

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