Invention Grant
- Patent Title: Silicone microparticles comprising silicone elastomer spherical microparticles coated with polyorganosilsesquioxane, and method of producing same
- Patent Title (中): 包含用聚有机倍半硅氧烷包覆的硅氧烷弹性体球形微粒的硅酮微粒及其制造方法
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Application No.: US12609429Application Date: 2009-10-30
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Publication No.: US08133586B2Publication Date: 2012-03-13
- Inventor: Yoshinori Inokuchi , Ryuji Horiguchi
- Applicant: Yoshinori Inokuchi , Ryuji Horiguchi
- Applicant Address: JP Tokyo
- Assignee: Shin-Etsu Chemical Co., Ltd.
- Current Assignee: Shin-Etsu Chemical Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2008-281527 20081031
- Main IPC: B32B5/66
- IPC: B32B5/66

Abstract:
Provided are silicone microparticles including 100 parts by mass of silicone elastomer spherical microparticles having a volume average particle diameter within a range from 0.1 to 100 μm, and 0.5 to 25 parts by mass of a polyorganosilsesquioxane that coats the surface of the silicone elastomer spherical microparticles, in which the silicone elastomer is capable of absorbing not less than 200 parts by mass of a polymethylsiloxane having a viscosity at 25° C. of not more than 10 mm2/s per 100 parts by mass of the silicone elastomer. These silicone microparticles are capable of absorbing a large amount of the above types of polymethylsiloxanes, which represent low-viscosity silicones, and can therefore suppress the greasiness, stickiness, and oily film feeling of cosmetic materials containing this type of polymethylsiloxane. The silicone microparticles can be produced by hydrolyzing and condensing an organotrialkoxysilane in a water medium, in the presence of the above silicone elastomer spherical microparticles and an alkaline material, thereby coating the surface of the silicone elastomer spherical microparticles with a polyorganosilsesquioxane.
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