Patent ID: 7842766

Claim:
A copolymer obtainable by the free radical copolymerization of a vinylic poly(alkylene oxide) compound (A) of the general formula (I), R 1 —O C m H 2m O n-1 H 2m —Z (I) in which R 1 is hydrogen, a C 1 -C 20 -alkyl radical, a C 5 -C 12 -cycloalkyl radical, an optionally substituted C 6 -C 14 -aryl radical, m is from 2 to 4, n is from 1 to 250, Y is O or NR 2 , R 2 is hydrogen, C 1 -C 12 -alkyl radical, C 6 -C 14 -aryl radical, —C m H 2m O—C m H 2m n-1 OR 1 , 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 R 3 , R 4 and R 5 , independently of one another, are hydrogen, a C 1 -C 4 -alkyl radical or an optionally substituted C 6 -C 14 -aryl radical and R 6 is —PO 3 H 2 , —CH 2 —N(CH 2 —PO 3 H 2 ) 2 , —(CH 2 ) x —PO 3 H 2 , —(CH 2 ) x —O—PO(OH) 2 , —CO—O—(CH 2 ) x —PO 3 H 2 , —CO—O—(CH 2 ) x —O—PO(OH) 2 , —CO—O—(C n″ H 2n″ O) x —PO 3 H 2 , —CO—NH—(C n″ H 2n″ O) x —PO 3 H 2 , —CO—O—CH 2 —CH(OH)—CH 2 O—PO 3 H 2 , —CO—O—(CH 2 ) x —N(CH 2 —PO 3 H 2 ) 2 , —Ar—PO 3 H 2 , —Ar—O—PO(OH) 2 , —CO—O—Ar—PO 3 H 2 , —CO—O—Ar—O—PO(OH) 2 , —CO—NH—Ar—PO 3 H 2 , —CO—NH—Ar—O—PO(OH) 2 , W is H, —(CH 2 ) x —PO 3 H 2 , W′ is H, —(CH 2 ) x —O—PO(OH) 2 , Z is H, OH, NH 2 , Ar is a C 6 -C 10 -aryl radical optionally substituted by H, C 1 -C 4 -alkyl or COOH groups, n″ is 2 or 3, x is from 1 to 12.