Abstract: The invention relates to a cosmetic or dermatological composition containing an acidic aqueous medium and at least one crosslinked poly(2-acrylamido-2-methylpropanesulfonic acid) polymer neutralized to at least 90%. The composition contains, distributed randomly: (a) from 90 to 99.9% by weight of units of formula (1); and in which X+ denotes a cation or a mixture of cations, it being possible for at most 10 mol % of the cations X+ to be protons H+; (b) from 0.01 to 10% by weight of crosslinking units originating from at least one monomer having at least two olefinic double bonds; the proportions by weight being defined with respect to the total weight of the polymer. The invention also relates to the use of this composition in the cosmetic treatment of keratinous substances, in particular of the skin, hair and mucous membranes, and in particular to a non-therapeutic process for depigmentation of the skin.

Abstract: The invention relates to a cosmetic or dermatological composition containing at least one active principle precursor capable of releasing an active principle by enzymatic reaction on contact with the Stratum corneum and at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90% and to its uses. It generally contains, distributed randomly: (a) from 90 to 99.9% by weight of units of formula (1): ##STR1## in which X.sup.+ denotes a cation or a mixture of cations, it being possible for at most 10 mol % of the cations X.sup.+ to be protons H.sup.+ ; and (b) from 0.01 to 10% by weight of crosslinking units resulting from at least one monomer having at least two olefinic double bonds, the proportions by weight being defined with respect to the total weight of the polymer.

Abstract: The present application relates to a cosmetic and/or dermatological composition in the form of a surfactant-free oil-in-water emulsion containing at least one crosslinked poly(2-acrylamido-2-methylpropanesulphonic acid) polymer neutralized to at least 90%. The composition contains, distributed randomly:(a) from 90 to 99.9% by weight of units of formula (1) below: ##STR1## in which X.sup.+ denotes a cation or a mixture of cations, it being possible for not more than 10 mol % of the cations X.sup.+ to be protons H.sup.+ ; and(b) from 0.01 to 10% by weight of crosslinking units originating from at least one monomer having at least two olefinic double bonds, the weight proportions being defined relative to the total weight of the polymer.