Novel shear-resistant polymer systems, production thereof, and also use thereof as thickeners

Abstract

The present invention relates to thickener polymers which comprise the following structural elements 1-3: a) as structural feature 1 at least one betainic monomer unit according to the formula below with a proportion by weight of from 0.1 to 99.9% by weight, based on the copolymer in which the mutually independent definitions are as follows: m=integer≧1; R1═H, C1-3 alkyl, —COOH; R2═H, C1-3 alkyl; R3=n- or isoalkylene of the formula —(CxH2x)—, in which x is an integer from 1 to 30; R4=—H, cycloalkyl, n- or isoalkyl, aryl; R5=n- or isoalkylene of the formula —(CyH2y)—, in which y is an integer from 1 to 30; A=—S—, —O—, —NR2, in which R2═H, C1-3 alkyl; b) as structural feature 2 at least one anionically charged monomer unit according to the following formula with a proportion by weight of from 0.1 to 99.9% by weight, based on the copolymer in which the mutually independent definitions are: l=integer≧1; R1═H, C1-3 alkyl, —COOH; R2═H, C1-3 alkyl; R6=—OH, —OOH, —SH, —(CxH2x)—COOH, —(CxH2x)—SO3H, —N (R2)—(CxH2x)—SO3H, in which —(CxH2x)—=n- or isoalkylene and x is an integer from 1 to 30; c) optionally as structural feature 3 one or more non-ionic comonomer units with a proportion by weight of from 0 to 50% by weight, based on the copolymer. When compared with the prior art, the thickener polymers have increased shear resistance in aqueous formulations.

Dependencies are inferred from the claim text.