Propionphenone derivatives as photoinitiators for photopolymerization

Abstract

Propiophenones of the formula I ##STR1## in which R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl, --Si(CH.sub.3).sub.3, allyl or benzyl, R.sup.2 is hydrogen, C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.4 -alkyl which is substituted by C.sub.1 -C.sub.4 -alkoxy or --OH, --(CH.sub.2 --CH.sub.2 --O).sub.n --R.sup.5 where n is 2 to 20 and R.sup.5 is H or C.sub.1 -C.sub.4 -alkyl, --Si(CH.sub.3).sub.3, benzyl, C.sub.3 -C.sub.6 -alkenyl, C.sub.3 -C.sub.4 -alkynyl or 2-tetrahydrofuranyl, or R.sup.1 and R.sup.2 together are a C.sub.1 -C.sub.6 -alkylidene radical or a C.sub.2 -C.sub.6 -alkylidene radical which is substituted by hydroxyl, C.sub.1 -C.sub.4 -alkoxy or phenyl, a linear or branched C.sub.2 -C.sub.6 -alkanediyl radical, a benzylidene, cyclopentylidene or cyclohexylidene radical or a 2,2,2-trichloroethylidene, 2-furylmethylidene or dimethylsilylidene radical, R.sup.3 is phenyl which is unsubstituted or substituted by one or more --Cl, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.4 -alkylthio radicals, and is also benzoylphenyl, phenoxyphenol or phenylthiophenyl, R.sup.4 is C.sub.1 -C.sub.4 -alkyl, or phenyl which is unsubstituted or substituted by one or more --Cl, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy radicals, and R.sup.5 is hydrogen or C.sub.1 -C.sub.4 -alkyl, or R.sup.4 and R.sup.5 together are a trimethylene or tetramethylene radical, and R.sup.6 is hydrogen, C.sub.1 -C.sub.4 -alkyl, --CCl.sub.3 or phenyl, subject to the condition that, if R.sup.2, R.sup.5 and R.sup.6 at the same time are hydrogen and R.sup.3 and R.sup.4 are at the same time phenyl, R.sup.1 must not be hydrogen or C.sub.1 -C.sub.4 -alkyl, also, if R.sup.3 and R.sup.4 at the same time are phenyl and R.sup.5 and R.sup.6 are at the same time hydrogen, R.sup.1 and R.sup.2 together must not be alkylidene or benzylidene, and also, if R.sup.3 and R.sup.4 at the same time are p-methoxyphenyl and R.sup.2, R.sup.5 and R.sup.6 are at the same time hydrogen, R.sup.1 must not be hydrogen, and, finally, if R.sup.2 and R.sup.6 at the same time are hydrogen and R.sup.3, R.sup.4 and R.sup.5 are at the same time phenyl, R.sup.1 must not be hydrogen, are valuable initiators for the photopolymerization of ethylenically unsaturated compounds.

Dependencies are inferred from the claim text.