Preferred examples of photopolymerizable compounds of this type which find utility in the mixtures (B) are ##STR31## in which R37 is hydrogen, chlorine, bromine or C1 -C4 -alkyl, in particular hydrogen or methyl, R38 is the radical of a diglycidyl or polyglycidyl compound after removal of two glycidyl radicals, --OOCR39 COO-- is the radical of a dicarboxylic or polycarboxylic acid and R40 is a C1