ACYLPHOSPHINE SULFIDES, THEIR PREPARATION AND A PROCESS FOR THE PREPARATION OF A PHOTOPOLYMERIZABLE COMPOSITION

摘要

of the disclosure: Acylphosphine sulfides of the formula < IMG > where R1 is alkyl, cycloalkyl or an unsubstituted or substituted phenyl, naphthyl or heterocyclic radical; R2 has the meanings of R1 and can be identical to or different from R1, or is alkoxy, unsubstituted or substituted phenoxy or phenoxyalkyl, or R1 or R2 are linked together to form a ring, which may contain further alkyl substituents and fused-on benzene rings; R3 is alkyl, a cycloaliphatic radical, substituted phenyl, an unsubstituted or substituted naphthyl or heterocyclic radical or the group < IMG > where X is unsubstituted or substituted phenylene or an aliphatic or cycloaliphatic divalent radical; and where one or more of R1, R2 and R3 may be olefinically unsaturated. These acylphosphine sulfides can be prepared from acylphosphines and sulfur and can be used as photoinitiators in photopolymerizable compositions,