Patent ID: 6060566
Filing Date: 2000-05-09
Classification: C08F,D21H

Abstract:
A graft polymer of a polymer containing vinyl ester or vinyl alcohol units and an ethylenically unsaturated compound, which graft polymer is obtainable by free radical polymerization of(A) monomers or monomer mixtures comprising(a) from 1 to 100% by weight of N-vinylformamide,(b) from 0 to 99% by weight of other monoethylenically unsaturated monomers copolymerizable with the monomers (a) and(c) from 0 to 5% by weight of monomers having at least two ethylenically unsaturated, nonconjugated double bonds in the molecule,in the presence of(B) polymers which contain units of vinyl esters of saturated C.sub.1 -C.sub.4 -carboxylic acids or vinyl alcohol units, or of mixtures which contain these polymers and polymers having at least 3 alkylene oxide units or polytetrahydrofuran,in a weight ratio (A):(B) of from 95:5 to 10:90 and subsequent elimination of from 1 to 100% of the formyl groups of the grafted-on N-vinylformamide by hydrolysis with formation of units of the formula ##STR20##