Photoinitiators for photopolymerization of unsaturated systems

Abstract

Compounds of the general formula I ##STR1## wherein Z is CR.sup.1 R.sup.2 (OR.sup.3) or phenyl, R.sup.1 being H, C.sub.1-6 -alkyl or phenyl, R.sup.2 being H, C.sub.1-6 -alkyl or C.sub.1-6 -alkoxy and R.sup.3 being H, C.sub.1-6 -alkyl or C.sub.1-6 -alkanoyl and Z' is Y--[(CH.sub.2).sub.m --X].sub.n --, X being CH.sub.2 or 0, Y being OH; COOH or SO.sub.3 H including the alkali metal, alkaline earth metal or ammonium salts thereof and also the salts thereof with organic nitrogen bases; or NRR' in which R and R' are in each case H, C.sub.1-20 -alkyl or C.sub.1-4 -hydroxyalkyl, if appropriate quaternized or in the form of the acid addition salts, and n and m each being the numbers 1-4, are excellently suitable as photoinitiators for the photopolymerization of ethylenically unsaturated compounds, in particular in aqueous systems.

Dependencies are inferred from the claim text.