Modifying acetalized polyvinyl alcohols with carboxylic acid anhydrides and their photochemical crosslinking.

摘要

New modified polymer (A) containing vinyl alcohol (VA) groups is obtained by (i) partial acetalization of VA-containing polymer (B) with one or more aldehydes; (ii) polymer-analogous reaction of the product, in a melt, with at least one olefinically unsaturated carboxylic anhydride (I) and (iii) photochemical crosslinking. An independent claim is included for a method for coating a substrate with (A) by performing steps (i) and (ii) as above; applying the reaction product to the substrate then photochemical crosslinking.