Acylphosphine oxides and their use

摘要

Acylphosphine oxides of the general formula where R1 is methyl or ethyl, R2 is a branched or straight-chain alkyl radical or chlorine, alkoxy or hydrogen, R3 and R4 are identical or different, and are each alkyl, alkoxy, alkylthio or chlorine and R5 is hydrogen, chlorine, alkoxy, alkylthio or alkyl, may be used as photoinitiators in photopolymerizable materials.