| 摘要 |
Acylphosphine oxide compounds of the general formula <IMAGE> where R1 is alkyl, cyclohexyl, cyclopentyl, aryl which is unsubstituted or substituted by halogen, alkyl or alkoxy, or an S-containing or N-containing five-membered or six-membered heterocyclic radical, R2 has one of the meanings of R1 (but R1 and R2 may be identical or different), or is alkoxy, aryloxy or aralkoxy, or R1 and R2 together from a ring, and R3 is straight-chain or branched alkyl of 2 to 18 carbon atoms, a cycloaliphatic radical of 3 to 12 carbon atoms, phenyl or naphthyl which are alkyl-, alkoxy- or thioalkoxy-substituted, or an S-containing or N-containing five-membered or six-membered heterocyclic radical, and may contain additional functional groups, or is the group <IMAGE> where R1 and R2 have the above meanings and X is phenyl or an aliphatic or cycloaliphatic divalent radical of 2 to 6 carbon atoms, and one or more of the radicals R1 to R3 may be olefinically unsaturated, a process for the preparation of these acylphosphine oxide compounds from acid halides of the general formula <IMAGE> where X is chlorine or bromine, and a phosphine of the general formula <IMAGE> and the use of the acylphosphine oxides as photoinitiators in photopolymerizable compositions.
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