Salts of copolymers of ethylenically unsaturated carboxylic acids and ethylenically unsaturated fatty acid derivatives

The present invention relates to salts of copolymers of ethylenically unsaturated carboxylic acids and ethylenically unsaturated fatty acid derivatives containing (A) 1-99% by weight of structural units A of the formula where R is hydrogen or C1-C4-alkyl, R is hydrogen or C1-C4-alkyl, R is hydrogen or C1-C4-alkyl, preferably methyl, X is -(CH2)0-10- or C6-C18-aryl, preferably phenyl and M is an alkali metal, alkaline earth metal or ammonium ion, (B) 99-1% by weight of structural units B of the formula where R is C2-C16-alkyl or C2-C16-alkenyl, Y is C1-C13-alkylene, -CH2-(CH=CH-CH2)1-5- or -(CH=CH)1-3- and Z is a group of the formula CN, C(O)N(R )2, where R is hydrogen, C1-C18-alkyl, C1-C18-alkenyl and/or -(CH2)1-3-OH, COOR , where R is C1-C36-alkyl, preferably C1-C5-alkyl or C16-C36-alkyl, (C) 0-40% by weight of structural units C of the formula where R , R and R are as defined above and W is a group of the formula CN, C(O)N(R )2, where R is as defined above, COOR , where R is C1-C18-alkyl, preferably C1-C10-alkyl and (D) 0-40% by weight of structural units D of the formula where V is C6-C18-aryl, preferably phenyl or phenoxyacetyl, C4-C6-lactam, preferably N-pyrrolidyl, a group of the formula O-R , where R is C1-C18-alkyl, preferably C1-C10-alkyl, a group of the formula (O)C-R or a group of the formula OOC-R . The present invention also provides a process for the preparation thereof and the use thereof.