Abstract: A process for the preparation of random radical copolymers which comprises a) at least one olefinically unsaturated sulfonic acid of the formula (I), where n is 0 to 10; X is O or NR5; R1 is hydrogen or methyl; R2, R3 independently of one another are hydrogen or C1- to C6-alkyl and R5 is hydrogen, alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, aryloxyalkyl, alkoxyaryl, hydroxyalkyl, (di)alkylaminoalkyl, (di)alkylaminoaryl, (di)arylaminoalkyl, alkylarylaminoalkyl or alkylarylaminoaryl, it being possible for the aryl radicals to be monosubstituted or polysubstituted, salts thereof or mixtures of acid and salts and b) at least two structurally different olefinically unsaturated monomers of the formula (II), where Y is O or NR7; R5 is hydrogen or methyl; R6 is alkyl, hydroxyalkyl, (di)alkylaminoalkyl or (di)alkylaminoaryl and R7 is hydrogen, alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, aryloxyalkyl, alkoxyaryl, hydroxyalkyl, (di)alkylaminoalkyl, (di)alkylaminoaryl, (di)arylaminoalkyl, alkyl

Abstract: A process for the preparation of random radical copolymers which comprises a) at least one olefinically unsaturated sulfonic acid of the formula (I), where n is 0 to 10; X is 0 or NR5; R1 is hydrogen or methyl; R2, R3 independently of one another are hydrogen or C1- to C6-alkyl and R5 is hydrogen, alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, aryloxyalkyl, alkoxyaryl, hydroxyalkyl, (di)alkylaminoalkyl, (di)alkylaminoaryl, (di)arylaminoalkyl, alkylarylaminoalkyl or alkylarylaminoaryl, it being possible for the aryl radicals to be monosubstituted or polysubstituted, salts thereof or mixtures of acid and salts and b) at least two structurally different olefinically unsaturated monomers of the formula (II), where Y is O or NR7; R5 is hydrogen or methyl; R6 is alkyl, hydroxyalkyl, (di)alkylaminoalkyl or (di)alkylaminoaryl and R7 is hydrogen, alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, aryloxyalkyl, alkoxyaryl, hydroxyalkyl, (di)alkylaminoalkyl, (di)alkylaminoaryl, (di)arylaminoal

Abstract: The invention relates to polyurethane block copolymers of general formula (I) to (IV), in which the variables are defined as follows: A represents a polyurethane block, which contains at least one hydrophilic group, B is a hydrophobic polyurethane block, X1, X2 are hydrophilic end groups and n is a whole number from 1 to 20. The invention also relates to the production of cross-linkable dispersion additives from the inventive polyurethane block copolymers and to the use of said cross-linkable dispersion additives for colorant preparations, in particular inks for ink-jet printing.

Abstract: The invention relates to a polyurethane comprising at least one anionic active group L. The anionic active group L is bound to a segment G in the polyurethane, said segment containing monomers that have been linked by radical polymerisation. The invention also relates to a binding agent composition containing an inventive polyurethane, to a method for the production thereof and to the use of polyurethanes of this type for producing magnetic recording media.