| 摘要 |
The invention relates to copolymers containing, incorporated by polymerization, a1) 30 to 90 wt % of at least one monoethylenically unsaturated C3-C8-carboxylic acid, an anhydride or a salt thereof; a2) 3 to 60 wt % of at least one monomer containing sulfonic acid groups; a3) 3 to 60 wt % of at least one non-ionic monomer of the formula I H2C=C (R1) (CH2)xO [R2-O]o-R3 (I), in which R1 is hydrogen or methyl, R2 is identical or different, linear or branched C2-C6-alkylene residues, which can be arranged in blocks or statistically, and R3 is hydrogen or a linear-chain or branched C1-C4-alkyl residue, x is 0, 1 or 2, and o is a natural number from 3 to 50; a4) 0 to 30 wt % of one or more additional ethylenically unsaturated monomers, which can be polymerized with a1), a2), and a3), wherein the sum of a1), a2), a3) and a4) equals 100 wt %. |
