Patent ID: 8519030

Claim:
Copolymer comprising i) 30-45 mol % of an isoprenol polyether derivative structural unit α, ii) 35-60 mol % of an acrylic acid derivative structural unit β and iii) 6-23 mol % of a hydroxyalkyl acrylate structural unit γ, the isoprenol polyether derivative structural unit a being represented by the following general formula (Ia) where A is identical or different and is represented by an alkylene group according to C x H 2x where x=2, 3, 4 or 5, a is identical or different and is represented by an integer between 5 and 45, the acrylic acid derivative structural unit β being represented by the following general formulae (IIa) and/or (IIb) where X is identical or different and is represented by NH—(C n H 2n ) where n=1, 2, 3 or 4 or represented by O—(C n H 2n ) where n=1, 2, 3 or 4; R 1 is identical or different and is represented by SO 3 H, PO 3 H 2 , OPO 3 H 2 and/or C 6 H 5 —SO 3 H where R 2 is identical or different and is represented by OH, OM where M=Na, K, or Ca, and/or ONH 4 and the hydroxyalkyl acrylate structural unit γ being represented by the following general formula (III) where R 3 is identical or different and is represented by a branched or straight-chain C 1 -C 5 monohydroxyalkyl group.