Copolymers based on unsaturated mono-or dicarboxylic acid derivatives and oxyalkylene glycol alkenyl ethers, method for the production and use thereof

A copolymer based on radicals of unsaturated monocarboxylic or dicarboxylic acid derivatives and oxyalkylene glycol alkenyl ethers, comprising

• a) from 51 to 95 mol % of structural units of the formula Ia and/or Ib and/or Ic
• where R1=hydrogen or an aliphatic hydrocarbon radical having from 1 to 20 carbon atoms,
• X=OaM, —O—(CmH2mO)n—R2, —NH—(CmH2mO)n—R2,
• M=hydrogen, a monovalent or divalent metal cation, an ammonium ion or an organic amine radical,
• a=½ or 1,
• R2=hydrogen, an aliphatic hydrocarbon radical having from 1 to 20 carbon atoms, a cycloaliphatic hydrocarbon radical having from 5 to 8 carbon atoms, a substituted or unsubstituted aryl radical having from 6 to 14 carbon atoms,
• Y=O, NR2,
• m=2 to 4 and
• n=0 to 200,
• b) from 1 to 48.9 mol % of structural units of the general formula II
• where
• R3=is hydrogen or an aliphatic hydrocarbon radical having from 1 to 5 carbon atoms,
• p is from 0 to 3,
• and R2, m and n are as defined above,
• c) from 0.1 to 5 mol % of structural units of the formula selected from one of IIIa and IIIb
• where
• S=H, —COOaM, —COOR5,
• —W—R7
• —CO—[NH—(CH2)3]s—W—R7
• —CO—O—(CH2)z—W—R7
• —(CH2)z—V—(CH2)z—CH═CH—R2
• —COOR5 in the case of S=—COOR5 or COOaM
• U1=—CO—NH—, —O—, —CH2O—
• U2=—NH—CO—, —O—, —OCH2—
• V=—O—CO—C6H4—CO—O— or —W—
• R4=H, CH3,
• R5=an aliphatic hydrocarbon radical having from 3 to 20 carbon atoms, a cycloaliphatic hydrocarbon radical having from 5 to 8 carbon atoms, an aryl radical having from 6 to 14 carbon atoms,
• r=2to 100
• s=1, 2
• z=0 to 4
• x=1 to 150
• y=0 to 15 and
• d) from 0 to 47.9 mol of structural units of the general formula selected from one or both of IVa and Ivb
• where a, M, X and Y are as defined above.