| abstract |
Water-soluble or water-swellable crosslinked copolymers consisting essentially of structural units of the formula 1or a mixture of the structural units of the formula 1 with structural units of the formula 2and structural units of the formula 3where R, R1, R2, R3, Z and n are as defined in the description. These copolymers are crosslinked with compounds which contain at least two olefinic double bonds. These crosslinked copolymers are suitable as thickeners, in particular for cosmetic and pharmaceutical preparations. |