Acylation of polyvinyl alcohols, and photopolymerizable and/or photocrosslinkable mixtures containing products thus acylated
AssigneeBASF SE
InventorsGuenther Schulz, Guenther Wallbillich
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Abstract
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) ##STR1## where R.sup.1 and R.sup.2 are each alkyl, or R.sup.1 and R.sup.2 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.
Claims13
A process for the acylation of a polyvinyl alcohol comprising esterifying the polyvinyl alcohol with a carboxylic acid derivative suitable for acylation reactions, in the heterogeneous phase in an aprotic dispersant, in the presence of a pyridine derivative catalyst of the formula I ##STR4## where R.sup.1 and R.sup.2 are each alkyl, or R.sup.1 and R.sup.2 together form an alkylene radical.
Dependencies are inferred from the claim text.