UV filter aqueous microdispersion based on methacrylate copolymer, process of its preparation and cosmetic photoprotective composition in which the aqueous microdispersion is comprised

摘要

The aqueous microdispersion comprises microparticles containing copolymer was prepared by copolymerizing 2- [3- (2H-benzotriazol-2-yl) -4-hydroxyphenyl] ethyl methacrylate (formula I) with minor amounts of a reactive vinyl type comonomers and crosslinkable components. Microdispersion microparticles with dimensions smaller than 300 nanometers is prepared by grinding the copolymer in a bead mill in the presence of sulfated oxyethylated fatty alcohol, and is intended for use as a UV filter to photoprotective cosmetic formulations. Photoprotective creams containing microdispersion benzotriazole copolymer having a high efficacy in filtering ultraviolet radiation in the UVB and the UVA region of the solar spectrum.