Patent ID: 8754150

Claim:
A dispersant Copolymer for building material mixtures comprising i) 30 to 47 mol % of a (meth)allyl alcohol polyether derivative structural unit α and ii) 53 to 70 mol % of a maleic acid derivative structural unit β, wherein the copolymer is present in aqueous solution which contains 30 to 95% by weight of water and 5 to 70% by weight of dissolved dry matter; the (meth)allyl alcohol polyether derivative structural unit α being represented by the following general formulae (Ia) and/or (Ib) where in each case 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 11 and 39, the maleic acid derivative structural unit β being represented by the following general formulae (IIa) and/or (IIb) where R 1 is identical or different and is represented by H and/or a straight-chain or branched C 1 -C 4 alkyl group; Z is identical or different and is represented by O and/or NH; where R 2 is identical or different and is represented by H and/or a straight-chain or branched C 1 -C 4 alkyl group; Q is identical or different and is represented by NH and/or O; R 3 is identical or different and is represented by H, (C n H 2n )—SO 3 H where n=0, 1, 2, 3 or 4, (C n H 2n )—OH where n=0, 1, 2, 3 or 4; (C n H 2n )—PO 3 H 2 where n=0, 1, 2, 3 or 4, (C n H 2n )—OPO 3 H 2 where n=0, 1, 2, 3 or 4, (C 6 H 4 )—SO 3 H, (C 6 H 4 )—PO 3 H 2 , (C 6 H 4 )—OPO 3 H 2 and/or (C m H 2m ) e —O-(A′O) α —R 4 where m=0, 1, 2, 3 or 4, e=0, 1, 2, 3 or 4, A′=C x′ H 2x′ where x′=2, 3, 4 or 5 and/or CH 2 C(C 6 H 5 )H—, α=an integer from 1 to 350 where R 4 is identical or different and is represented by a straight-chain or branched C 1 -C 4 alkyl group.