Photocurable molding, impregnating and coating compositions

A photocurable molding, impregnating and coating composition comprising a mixture of

• (a) or more ethylenically unsaturated polyesters or vinyl ester resins having the characteristic group --CO--OCH.sub.2 CHOH--CH.sub.2 O--,
• (b) one or more ethylenically unsaturated copolymerizable monomeric compounds,
• (c) an inhibitor and
• (d) an UV sensitizer,
• with or without
• (e) paraffins, thermally decomposable initiators, fillers, reinforcing agents, lubricants, inert solvents, shrinkage-reducing additives and other assistants usable in unsaturated polyesters,
• wherein the UV sensitizer consists of one or more acylphosphine oxide compounds of the formula ##STR26## where R.sup.1 is straight-chain or branched alkyl of 1 to 6 carbon atoms, cyclohexyl, cyclopentyl, aryl which is unsubstituted or substituted by halogen, alkyl or alkoxy, or a S-containing or N-containing five-membered or six-membered heterocyclic radical, R.sup.2 has one of the meanings of R.sup.1 (but R.sup.1 and R.sup.2 may be identical or different), or is alkoxy of 1 to 6 carbon atoms, aryloxy or aralkoxy, or R.sup.1 or R.sup.2 together stand for an o-phenylene-dioxy group, and R.sup.3 is a substituted or unsubstituted straight-chain or branched alkyl of 2 to 18 carbon atoms, a cycloaliphatic radical of 3 to 10 carbon atoms, vinyl, phenyl, naphthyl or a S-, O- or N-containing five-membered or six-membered heterocyclic radical or is the group ##STR27## where R.sup.1 and R.sup.2 have the above meanings and X is phenylene or an aliphatic or cycloaliphatic divalent radical of 2 to 6 carbon atoms.