| abstract |
The invention relates to a linear, branched or cross-linked polyelectrolyte resulting from the polymerisation, for 100 mol %, of: a) a molar ratio greater than or equal to 50% and less than or equal to 99% of monomer units originating from at least one cationic monomer; b) a molar ratio greater than 1% and less than or equal to 50% of monomer units originating from at least one monomer comprising a fully or partially salified free weak acid function; c) optionally a molar ratio greater than 0 mol % and less than or equal to 5 mol % of monomer units originating from at least one monomer of formula A-C(=O)-O-[(CH 2 -CH(R 1 )-O] n -R (I), where n is, independently, a number from 1 to 50, A is a monovalent unsaturated aliphatic radical having 2 to 6 carbon atoms, Ri is a hydrogen atom, a methyl radical, or an ethyl radical, and R is a linear or branched, saturated or unsaturated aliphatic hydrocarbon radical having 8 to 30 carbon atoms; and d) optionally a molar ratio greater than 0% and less than or equal to 1% of a diethylene or polyethylene cross-linking monomer. The invention also relates to a method for preparing same and to the use thereof as a thickening agent for cosmetic or pharmaceutical compositions. |