USE OF COPOLYMER AS ADDITIVE FOR COSMETIC PREPARATION FOR SKIN AND PREPARATION FOR SKIN AND ITS PREPARATION

摘要

PROBLEM TO BE SOLVED: To obtain a new cosmetic which permits an improvement in skin care. SOLUTION: This cosmetic is obtained by the use of at least a kind of copolymer prepared by radical-copolymerizing a monomer mixture comprising (a) 1-99.99 mass % of at least a kind of monomer selected from N-vinylimidazols and, if necessary, partially or completely quarternized diallylamines, (b) 0-98.99 mass % of at least a kind of neutral or basic water-soluble monomer, (c) 0-50 mass % of at least a kind of unsaturated acid or unsaturated acid anhydride, (d) 0-50 mass % of at least a kind of radical-copolymerizable monomer and (e) 0.01-10 mass % of a monomer which has at least two ethylenically unsaturated nonconjugated double bonds and acts as a kind of crosslinking agent and by partially or completely quarternizing the copolymer or carrying out protonation of the copolymer when the monomer a is not quarternized or partially quarternized.