| abstract |
An invention relating to a copolymer comprising structural units derived from monomers which are (A) at least one ethylenically unsatured alcohol, carboxylic acid or ester, with at least one of (B) an ethylenically unsaturated carboxylic ester with a polar group in the ester, and (C) an ethylenically unsaturated carboxylic amide, said copolymer being of molecular weight less than 20000. |