C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
167/300, 400/722
C08L 83/04 (2006.01) A61K 8/891 (2006.01) C08K 3/36 (2006.01) C08K 7/26 (2006.01)
Patent
CA 1332199
ABSTRACT OF THE DISCLOSURE A process for preparing a silicone composition is provided, which comprises a step of distilling away an organic solvent from a mixture of (1) a low viscosity silicone oil represented by the general formula, R a SiO (4-a)/z (wherein R's may be the same or different, each being an unsubstituted or substituted, monovalent hydrocarbon residue containing 1 to 6 carbon atoms; and "a" ranges from 1.8 to 2.3), and having a viscosity of 100 centistokes or less at 25°C, with (2) an organosilica sol containing, as a dispersoid, spherical porous trimethylsilylated silica particles having an average particle size of 10 to 100 millimicrons, a specific surface area of 300 m2/g or above, a trimethylsilyl group density of 0.5 to 10 micromol/m2, an alkoxy group density of 0.5 to 10 micromol/m2, and a silanol group density of 0.5 to 5 micromol/m2, and a step of homogeneously kneading the resulting mixture under shearing stress. The thus prepared silicone composition has not only low toxicity and low stimulability but also excellent homogeneity, smoothness and extensibility, so it is well suited to be used as base ingredient of cosmetic, medical or lustering materials.
610951
Goi Takahiro
Kuwata Satoshi
Ogihara Tsutomu
Shimizu Takaaki
Marks & Clerk
Shin-Etsu Chemical Co. Ltd.
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