Silicone composite particles, making method, and cosmetic composition

摘要

Silicone composite particles are provided in which silicone elastomer spherical particles having a volume average particle size of 0.1-100 μm are coated with an organosilsesquioxane-based silicone resin containing inorganic nano-particles having a volume average particle size of up to 100 nm. The silicone composite particles are compounded in a cosmetic composition to exert a UV screening effect or bactericidal property inherent to inorganic nano-particles and to impart a pleasant feel on use. A preparing method and a cosmetic composition are also provided.

主权项

1. Silicone composite particles comprising: 100 parts by weight of spherical particles of a silicone elastomer having a volume average particle size of 0.1 to 100 m, coated on their surfaces with 0.5 to 25 parts by weight of a silicone resin based on organosilsesquioxane units, said silicone resin containing 0.1 to 25 parts by weight of inorganic nano-particles having a volume average particle size of up to 100 nm, wherein said inorganic nano-particles are selected from the group consisting of titanium oxide, iron oxide, and zinc oxide, wherein the inorganic nano-particles are dispersed in the silicone, and said silicone composite particles are prepared by adding an acidic or basic substance and a compound selected from the group consisting of alkoxysilanes, silanol-containing silanes and partial condensates thereof to a mixed water dispersion of silicone elastomer spherical particles and inorganic nano-particles, and subjecting the compound to hydrolytic condensation reaction, thereby coating surfaces of the silicone elastomer spherical particles with a silicone resin having the inorganic nano-particles laden therein while taking inorganic nanoparticles therein.