Cosmetic compositions comprising nanopigments

摘要

Cosmetic composition comprising a filler, a greasy binder and at least 2 % by weight on total weight of the composition of at least one nanopigment such that (i) the pigment volume concentration of the combination of nanopigments and fillers is less than or equal to the critical pigment volume concentration and (ii) the volume of fillers Vc is greater than or equal to twice the volume of the nanopigments Vn. Preferably the nanopigments are chosen from metal oxides such as Fe2O3, TiO2, ZnO, Bi oxychloride, CrO3, etc. The nanoparticles are e.g. generally spherical, with an average size of 0.01-0.15 microns, or non- spherical with a largest dimension of 0.15 microns. The fillers are selected e.g. from talc, silica, mica, boron nitride, polyamide powder, silicone powder or polymethyl methacrylate powder, and preferably have a particle size of≥10 microns. Preferably the composition contains 2-30 wt. % of the mixture of nanopigments and fillers. Preferably the system of fillers + nanopigments satisfies the relationship (pigment volume concentration)≤(critical pigment volume concentration)/2.