Bisacylphosphine oxides, the preparation and use thereof

Abstract

Bisacylphosphine oxides of the general formula ##STR1## wherein R.sup.1 stands, for example, for a straight-chain or branched C.sub.1-18 alkyl radical, a cyclohexyl, cyclopentyl, phenyl, naphthyl, or biphenylyl radical, a cyclopentyl, cyclohexyl, phenyl, naphthyl, or biphenylyl radical substituted by F, Cl, B, I, C.sub.1 -C.sub.12 alkyl and/or C.sub.1 -C.sub.12 alkoxyl, or an S or N-containing 5-membered or 6-membered heterocyclic ring, and R.sup.2 and R.sup.3, which are the same or different, stand for a cyclohexyl, cyclopentyl, phenyl, naphthyl, or biphenylyl radical, a cyclopentyl, cyclohexyl, phenyl, naphthyl, or biphenylyl radical substituted by F, Cl, Br, I, C.sub.1-4 alkyl and/or C.sub.1-4 alkoxyl, or an S or N-containing 5-membered or 6-membered heterocyclic ring; or R.sup.2 and R.sup.3 are joined to form a ring which contains from 4 to 10 carbon atoms and which may be substituted by 1 to 6 C.sub.1-4 alkyl radicals. The compounds are prepared by oxidation of the corresponding bisacylphosphines. The compounds are suitable for use as initiators for the photopolymerization of compounds containing ethylenically unsaturated bonds.

Dependencies are inferred from the claim text.