Patent ID: 6384104
Filing Date: 2002-05-07
Classification: A61K,A61Q,B82Y,C08F,C08L

Abstract:
A method for providing storage stability of UV radiation-absorption compositions, comprising adding to the compositions 5 to 70 percent of latex polymer particles, based on total weight nonvolatiles, to increase the UV radiation absorption of the compositions, wherein:(a) the composition comprises at least one UV radiation absorbing agent; (b) the latex polymer particles contain a void and have a particle size from 50 to 1000 nanometers; and (c) the latex polymer particles comprise a shell portion prepared by one or more steps selected from the group consisting of: (i) polymerization to incorporate from 4 to 80 percent monomeric units, based on total weight of the shell portion, of one or more polyethylenically unsaturated monomers; and (ii) polymerization, and post-polymerization crosslinking, to incorporate from 4 to 80 percent monomeric units, based on total weight of the shell portion, of one or more multifunctional monomers having at least one functional group capable of vinyl copolymerization and at least one functional group capable of reaction with a reactive molecule effective to produce post-polymerization crosslinking.