Patent ID: 7422735

Claim:
In a skin cosmetic or dermatological preparation selected from cosmetic compositions for cleansing the skin, cosmetic compositions for the care and protection of the skin, nail care compositions, and preparations for decorative cosmetics, the improvement wherein the composition consists essentially of customary additives and at least one copolymer obtained by (i) free-radically initiated copolymerization of a monomer mixture comprising (a) 1 to 99.99% by weight of at least one monomer selected from the group consisting of N-vinylimidazoles and diallylamines, optionally in partially or completely quaternized form; (b) 0 to 98.99% by weight of at least one neutral or basic water-soluble monomer which is different from (a); (c) 0 to 40% by weight of at least one unsaturated acid or unsaturated anhydride, (d) 0 to 50% by weight of at least one free-radically copolymerizable monomer which is different from the monomers (a), from the monomers (b) and from the monomers (c); and (e) 0.01 to 10% by weight of at least one monomer which acts as crosslinker and has at least two ethylenically unsaturated, nonconjugated double bonds; and (ii) subsequent partial or complete quaternization and protonation of the polymer in the case where the monomer (a) is unquaternized or only partially quaternized.