SHEAR STABLE POLYMERS, THEIR PREPARATION AND THEIR USE AS THICKENER

摘要

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=integer1; R1H, C1-3 alkyl, COOH; R2H, 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 R2H, 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=integer1; R1H, C1-3 alkyl, COOH; R2H, 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.