Patent ID: 8344089

Claim:
A copolymer of formula (1) [A′] a′ [B′] b′ [C′] c′ [D′] d′ , (1) where A′ =structural unit of formula (2) with n =2 to 498, B′=structural unit of formula (3) C′ =identical or different structural units of formulae (4) and/or (5) —CH 2 —CH 2 -Q1-CH 2 —CH 2 — (4) —O-Q2-O— (5) D′=identical or different structural units of formulae (6) and/or (7) —CH 2 —CH 2 -Q1-CH═CH 2 (6) —O-Q2-OH (7) in which a independently at each occurrence is 0 to 500, b independently at each occurrence is 0 to 60, c independently at each occurrence is 0 to 10, d independently at each occurrence is 0 to 10, with the proviso that c +d is greater than/equal to 1, R independently at each occurrence is a radical from the group of linear, cyclic or branched, aliphatic or aromatic, saturated or unsaturated hydrocarbon radicals having from 1 up to 20 C atoms, R1 independently at each occurrence is a bond to a structural unit or R, R3 independently at each occurrence is R1 or a heteroatom-substituted, functional, organic, saturated or unsaturated radical, with the proviso that at least one R1 is a bond to a structural unit and that the average number of T and Q units per structural unit B′ is in each case not greater than 20 and the average number of D units per structural unit B′ is not greater than 2000, a′, b′, c′ and d′ are indices which indicate the molar fractions of the structural units A′ to D′ in the compound of the formula (1), and a′ is from 20% to 70%, b′ is greater than 0% to 20%, c′ =30% to <60%, and d′ is greater than/equal to 0%, Q1=a bond or an organic radical and Q2=an organic radical.