CHITIN OR CHITIN DERIVATIVE MICROCAPSULES CONTAINING A HYDROPHOBIC SUBSTANCE, PARTICULARLY A SUN FILTER AND METHOD FOR PREPARING SUCH MICROCAPSULES

摘要

The invention concerns microcapsules characterised in that they are formed by a wall of chitin or chitin derivatives or of polyhydroxylated polyamines or one of their salts, said wall sheathing a hydrophobic substance It also concerns a method for preparing microcapsules characterised in that it consists in: forming a hydrophobic phase emulsion consisting of the hydrophobic substance in an aqueous phase containing an anionic surfactant selected among surfactants capable of causing insolubilisation of chitosan or chitosan derivatives or polyhydroxylated polyamines; mixing said emulsion with a chitosan or chitosan derivative or polyhdroxylated polyamine organic salt so as to cause the coacervation of the chitosan or the chitosan derivatives or the polyhydroxylated polyamines around the droplets of the hydrophobic phase; subjecting the chitosan or chitosan derivative or the polyhydroxylated polyamine coacervate to an acetylation or cross linking reaction; recuperating the microcapsules. The invention is applicable to cosmetic compositions incorporating sun filters.