Patent ID: 7388068

Claim:
A copolymer made of alkylene oxides and glycidyl ethers according to formula (I) in which R 1 is hydrogen or a C 1 -C 4 -alkyl radical, R 2 and R 4 are hydrogen or a methyl group, R 3 is an alkyl or aryl radical having 1 to 50 carbon atoms which may also contain heteroatoms, A is an alkylene unit having 2 to 6 carbon atoms, x is 0 or 1, y is 0 or 1, n is a number from 2 to 50, k is a number from 1 to 100, R 5 is an acid group or hydrogen, and m is a number from 2 to 100, with the proviso that (y+n) must be at least 2.