Curable compositions

Claim 1

Photocurable compositions consisting essentially of (A) an epoxy resin polymerizable to a higher molecular weight state containing modifying reactive alcohols and (B) an effective amount of a radiation sensitive aromatic onium salt of a Group Va element capable of effecting the cure of (A) when exposed to radiant energy where the aromatic onium salt of a Group Va element has the formula, [(R).sub.a (R.sup.1).sub.b (R.sup.2).sub.c X].sub.d.sup.+ [MO.sub.e ].sup.-(e-f) where R is a monovalent aromatic organic radical selected from carbocyclic radicals and heterocyclic radicals, R 1 is a monovalent organic aliphatic radical selected from alkyl, alkoxy, cycloalkyl and substituted derivatives thereof, R 2 is a polyvalent organic radical forming an aromatic heterocyclic or fused ring structure with X, X is a Group Va element selected from N, P, As, Sb and Bi, M is a metal or metalloid, Q is a halogen radical, a is a whole number equal to 0 to 4 inclusive, b is a whole number equal to 0 to 2 inclusive, c is a whole number equal to 0 to 2 inclusive and the sum of a+b+c is a value equal to 4 or the valence of X, d=e-f, f=valence of M and is an integer equal to from 2 to 7 icnlusive, e is >f and is an integer having a value up to 8.