Patent ID: 7645345

Claim:
A method of machine washing dishes, comprising machine washing dishes with a composition comprising a copolymer containing sulfonic acid groups which comprises: (a) 30 to 95 mol % of at least one monoethylenically unsaturated carboxylic acid, one monoethylenically unsaturated carboxylic ester or one water-soluble salt of a monoethylenically unsaturated carboxylic acid, (b) 3 to 35 mol % of at least one monomer containing sulfonic acid groups of the formula I H 2 C═C(R)—X—SO 3 M (I) wherein R is hydrogen or methyl; X is —COO—R 1 —; R 1 is unbranched or branched C 1 -C 4 -alkylene; M is hydrogen, alkali metal or ammonium, and (c) 2 to 35 mol % of at least one nonionic monomer of the formula II wherein R 2 is hydrogen or methyl; R 3 is a chemical bond or unbranched or branched C 1 -C 6 -alkylene; R 4 are identical or different unbranched or branched C 2 -C 4 -alkylene radicals; R 5 is unbranched or branched C 1 -C 6 -alkyl; n is 3 to 50, in random or block copolymerized form.