Patent ID: 7182938

Claim:
A method of protecting human skin or human hair from ultraviolet radiation comprising treating said skin or hair with an effective protecting concentration of a surface treated particle comprising a plurality of zinc oxide and/or titania particles and a star-graft copolymer with looped and/or linear polymeric structure on a star-graft copolymer encapsulating at least a portion of said particles, said surface treatment comprising: Si (x, y) where x and y are mole percent trifunctional and difunctional monomeric units, respectively and wherein x and y are about 1–40 and 60–99, respectively, wherein: x is selected from the group of trifunctional monomers that have cosmetically acceptable non-reactive ligands comprising of methyltrimethoxysilane, n-propyltrimethoxysilane, isobutyltrimethoxysilane, n-hexyltrimethoxysilane, n-octyltrimethoxysilane, n-octadecyltrimethoxysi-lane, phenyltrimethoxysilane, and the triethoxy-containing counterparts of these monomers; y is selected from the group of difunctional monomers that have cosmetically acceptable non-reactive ligands comprising of dicyclohexyldimethoxysilane, diethyldiethoxysilane, dimethyldichlorosilane, dimethyldiethoxysilane, dimethyldimethoxysilane, diphenyldiethoxysilane, diphenyldimethoxysilane, di-n-hexyldichlorosilane-, n-hexylmethyldichlorosilane, methyldodecyldiethoxysilane, n-octylmethyldimethoxysilane, and the diethoxy-containing counterparts of these monomers, where the product(s) per se, defined as surface treated ZnO and/or TiO 2 , are used in personal care formulations.