| abstract |
Copolymers contain, as characteristic polymerized monomer units, (a) 2 to 50 mol % vinylalkylether with 3 to 30 C atoms in the molecule; (b) 10 to 88 mol % monoethylenically unsaturated dicarboxylic acid anhydrides and (c) 10 to 88 mol % dialkylesters of monoethylenically unsaturated dicarboxylic acids. A process is disclosed for producing these copolymers by copolymerizing the monomers (a), (b) and (c) at temperatures between 40 and 180 C in the presence of radical-building initiators. Also disclosed is the use of the copolymers as film forming resins in hair sprays and in the form of alkaline metal, ammonium or alkaline earth metal salts as thickeners for aqueous systems, such as cosmetic and pharmaceutical compositions, textile printing pastes, liquid washing and cleaning agents. |