The present invention relates to the formation of surface treated zinc
oxide and titania particles, and in particular zinc oxide and titania
nanoparticles, with a siloxane star-graft copolymer coating, comprising a
looped and/or linear polymeric structure on a star-graft copolymer
coating, on a particle surface to control the interfacial surface
interactions between the particle and the oil phase of the cosmetic skin
formulation.