Abstract: Curable coating compositions of olefinically unsaturated compounds A and an N-vinyl compound B. The N-vinyl compounds carry at least 2 N-vinyl groups and at least one carbonyl group bonded to the nitrogen of the N-vinyl group. The coating compositions can be used for the manufacture of paints, printing inks, printing plates and photoresist materials.

Abstract: Unsymmetrical monoketals of aromatic 1,2-diketones ##STR1## wherein R.sup.1 and R.sup.2 are different radicals, are manufactured by reacting the corresponding aromatic 1,2-diketones, in an organic solvent, with an acid ester (R.sup.1).sub.n X as alkylating agent and an alcoholate (R.sup.2 O).sub.m Me, where n and m are integers from 1 to 3, X is an acid radical and Me is a metal of main groups 1 to 3 of the periodic table of the elements. The resulting diketone monoacetals are particularly suitable for use as photoinitiators in photopolymerizable compositions.

Abstract: A photopolymerizable composition which contains one or more olefinically unsaturated compounds and from 0.2 to 20% by weight (based on the unsaturated compound(s)) of a photoinitiator, with or without conventional additives, the photoinitiator being a mixture of one or more aromatic carbonyl compounds of the general formula (A) ##STR1## where Ar is an ortho-arylene radical which may or may not be substituted by one or more radicals R.sup.1 to R.sup.4, R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and each is H, alkyl or 1 to 5 carbon atoms, phenyl, halogen, alkoxy of 1 to 5 carbon atoms, alkaryl of 7 to 11 carbon atoms, aralkyl of 7 to 11 carbon atoms or --CO.sub.2 R.sup.9, where R.sup.9 is alkyl of 1 to 5 carbon atoms, and n is 0 or 1, and an amine, with or without an aromatic carbonyl compound which differs from (A).This photopolymerizable composition is particularly suitable for the manufacture of photopolymer printing plates and UV-curing printing inks.

Abstract: Photopolymerizable coating compositions contain, as the binder, olefinically unsaturated compounds having a boiling point above 50.degree. C, together with from 0.5 to 15% by weight of photoinitiators, based on the binder. The photoinitiators are a mixture of an aromatic carbonyl compound A, which is a derivative of benzoin or benzil, which has at least one carbon-oxygen single bond in the .alpha.-position relative to the carbonyl group, an aromatic carbonyl compound B which is derived from benzophenone, fluorenone, anthraquinone, xanthene, thioxanthone or acridone, and an amine C of the general formula ##STR1## where R', R" and R"' are H, alkyl of 1 to 10 carbon atoms, cycloalkyl of 3 to 10 carbon atoms, aryl, hydroxyalkyl of 1 to 8 carbon atoms or alkoxyalkyl of 2 to 4 carbon atoms, but at most 2 substituents are H and at most 2 substituents are aromatic.These coating compositions may be used for finishing various substrates, as fillers or as printing inks.

Abstract: A photopolymerizable composition containing olefinically unsaturated compounds, optional conventional additives and, as photoinitiator, a mixture of a thioether of the general formula (I): ##STR1## where R.sup.4 is phenyl, naphthyl, thienyl, furyl or styryl which may be substituted by one or more identical or different R.sup.5 's,R.sup.5 is phenyl, benzoyl, halogen, alkyl of 1 to 5 carbon atoms, alkyl having an --O--group and 1 to 5 carbon atoms, alkyl having an --S--group and 1 to 5 carbon atoms, alkoxyalkyl of 2 to 5 carbon atoms, alkaryl of 7 to 11 carbon atoms, aralkyl of 7 to 11 carbon atoms, NO.sub.2, CN, COOH or COOR.sup.6, R.sup.6 being an alkyl of 1 to 5 carbon atoms,A is the alkylene group C.sub.n H.sub.2n (n = an integer of 1 to 5) which may be substituted by one or more R.sup.4 's and/or R.sup.5 's, andR.sup.1, r.sup.2 and R.sup.3 may be identical or different and are each H, an R.sup.4 or an R.sup.5,and an organic amine.