VERFAHREN ZUR ACYLIERUNG VON POLYVINYLALKOHOLEN UND SO ACYLIERTE PRODUKTE ENTHALTENDE PHOTOPOLYMERISIERBARE UND/ODER PHOTOVERNETZBARE MISCHUNGEN

摘要

The acylation of polyvinyl alcohols is carried out by a process in which these alcohols are esterified with an activated carboxylic acid derivative in the presence of, as the catalyst, an aminopyridine derivative of the general formula (I) (I) where R1 and R2 are each alkyl, or R1 and R2 together form an alkylene radical. The acylation is particularly advantageously carried out in the heterogeneous phase. The acylated polyvinyl alcohols prepared in this manner are used in photopolymerizable and/or photocrosslinkable mixtures.