Patent ID: 8022120
Filing Date: 2011-09-20
Classification: C04B,C08F,C08L

Abstract:
1. A comb polymer having a carbon backbone which bears polyether groups of the formula A where * indicates the point of bonding to the carbon backbone of the comb polymer, U is a chemical bond or an alkylene group having from 1 to 8 carbon atoms, X is oxygen or an NR group, k is 0 or 1, n is an integer whose average value, based on the comb polymer, is in the range from 11 to 300, Alk is C Y is a linear or branched alkylene group which has from 2 to 8 carbon atoms and may bear a phenyl ring, Z is a 5- to 10-membered nitrogen heterocycle which is bound via nitrogen and can have, in addition to the nitrogen atom and carbon atoms, 1, 2 or 3 additional heteroatoms selected from among oxygen, nitrogen and sulfur as ring members, with the nitrogen ring members being able to bear a group R′ and 1 or 2 carbon ring members being able to be present as carbonyl groups, R is hydrogen, C R′ is hydrogen, C and functional groups B are in the form of anionic groups at a pH of >12, wherein on average at least 90 mol % of the Alk-O units in the group (Alk-O) wherein the molar ratio of polyether groups A and functional groups B is in the range from 2:1 to 1:20, or a salt of the comb polymer.