Copolymers comprising carboxylic acid groups, sulfo groups and polyalkylene oxide groups as a scale-inhibiting additive to washing and cleaning products

摘要

The invention relates to copolymers which comprise, in copolymerized form,a1) 30 to 90% by weight of at least one monoethylenically unsaturated C₃-C₈-carboxylic acid or of an anhydride or water-soluble salt thereof,a2) 3 to 60% by weight of at least one monomer comprising sulfo groups,a3) 3 to 60% by weight of at least one nonionic monomer of the formula (I)H₂C═C(R¹)COO—[R²—O]_o—R³  (I) in which R¹ is hydrogen or methyl, R² are identical or different, linear or branched C₂-C₆-alkylene radicals which may be arranged in blocks or randomly, and R³ is hydrogen or a straight-chain or branched C₁-C₄-alkyl radical and o is a natural number from 3 to 50,a4) 0 to 30% by weight of one or more further ethylenically unsaturated monomers which are polymerizable with a1), a2) and a3),where the sum of a1), a2), a3) and a4) adds up to 100% by weight.