Process for producing cationic polyvinyl acetals

摘要

Method for preparing cationic poly(vinyl acetals) (I) by copolymerizing at least one cationic monomer (M1) with one or more vinyl esters of optionally branched 1-15C carboxylic acids; then saponification and acetalization. Method for preparing cationic poly(vinyl acetals) (I) by copolymerizing at least one N-alkyldiallylammonium salt as cationic monomer (M1) with one or more vinyl esters of optionally branched 1-15C carboxylic acids; then saponification to a copolymer of at least 50wt.% vinyl alcohol units and acetalization of these units to semi-acetal or complete acetal, using one or more 1-15C aliphatic aldehyde. The new feature is that copolymerization is done in a mixture of water and monovalent aliphatic alcohol, of water content 2-35wt.%.