The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 1991
Filed:
Sep. 11, 1989
Satoshi Kuwata, Annaka, JP;
Takahiro Goi, Kanra, JP;
Takaaki Shimizu, Jyouetsu, JP;
Tsutomu Ogihara, Jyouetsu, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
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.sub.a SiO.sub.(4-a)/2 (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.degree. 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 m.sup.2 /g or above, a trimethylsilyl group density of 0.5 to 10 micromol/m.sup.2, an alkoxy group density of 0.5 to 10 micromole/m.sup.2, and a silanol group density of 0.5 to 5 micromol/m.sup.2, 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.