Tetrasubstituted phthalic acid derivatives, and a process for their preparation

摘要

Novel tetrasubstituted phthalic acid derivatives of the formula (I) are described, in which Y1 and Y2 are oxygen and Y is or -O-, or one of Y1 and Y2 is oxygen and the other is =N-R'' and Y is -O-, and m, n, X, R, R' and R'' are as defined in claim 1. The compounds (I) are suitable as sensitizers for photocrosslinkable polymers or as initiators for the photopolymerization of ethylenically unsaturated compounds or for the photochemical crosslinking of polyolefins.