Phosphorus-containing copolymers, method for the production thereof, and use thereof

A copolymer obtainable by the free radical copolymerization of a vinylic poly(alkylene oxide) compound (A) of the general formula (I),

• R1—OCmH2mOn-1H2m—Z (I)
• in which
• R1 is hydrogen, a C1-C20-alkyl radical, a C5-C12-cycloalkyl radical, an optionally substituted C6-C14-aryl radical,
• m is from 2 to 4,
• n is from 1 to 250,
• Y is O or NR2,
• R2 is hydrogen, C1-C12-alkyl radical, C6-C14-aryl radical, —CmH2mO—CmH2mn-1OR1,
• m′ is from 1 to 4,
• n′ is from 0 to 2,
• with an ethylenically unsaturated monomer compound (B) of the general formula (II)
• in which
• R3, R4 and R5, independently of one another, are hydrogen, a C1-C4-alkyl radical or an optionally substituted C6-C14-aryl radical and
• R6 is —PO3H2,
• —CH2—N(CH2—PO3H2)2,
• —(CH2)x—PO3H2,
• —(CH2)x—O—PO(OH)2,
• —CO—O—(CH2)x—PO3H2,
• —CO—O—(CH2)x—O—PO(OH)2,
• —CO—O—(Cn″H2n″O)x—PO3H2,
• —CO—NH—(Cn″H2n″O)x—PO3H2,
• —CO—O—CH2—CH(OH)—CH2O—PO3H2,
• —CO—O—(CH2)x—N(CH2—PO3H2)2,
• —Ar—PO3H2,
• —Ar—O—PO(OH)2,
• —CO—O—Ar—PO3H2,
• —CO—O—Ar—O—PO(OH)2,
• —CO—NH—Ar—PO3H2,
• —CO—NH—Ar—O—PO(OH)2,
• W is H, —(CH2)x—PO3H2,
• W′ is H, —(CH2)x—O—PO(OH)2,
• Z is H, OH, NH2,
• Ar is a C6-C10-aryl radical optionally substituted by H, C1-C4-alkyl or COOH groups,
• n″ is 2 or 3,
• x is from 1 to 12.