Curable organic resin compositions and foaming method

Claim 1

A foaming method which comprises, (1) agitating an exothermically curable composition comprising (C) cationically polymerizable organic material (D) an effective amount of a curing agent consisting essentially of a dialkylhydroxyarylsulfonium salt of the formula, R(R.sup.1).sub.a S].sup.+ [Y].sup.-, and an organic oxidant selected from an iodosoaromatic compound, a hydroquinone, and an organic peroxide having a decomposition accelerator selected from an organic amine and compound of a transition metal, and (E) 1% to 30% by weight of (C), (D) and (E) of a volatile inert organic solvent, and (2) thereafter allowing the ingredients of the resulting mixtures to react resulting in the production of exothermic heat and the simultaneous evaporation of the organic solvent and the cure of the cationically polymerizable organic resin, where R is a C.sub.(6-20) aromatic radical having from 1 to 3 nuclearly bonded hydroxy radicals, R 1 can be the same or different C.sub.(1-8) alkyl radical or an alkylene radical capable of forming a cycloaliphatic or heterocyclic ring, Y is a nonnucleophilic anion, a is an integer equal to 0 or 2, and when R 1 is alkyl, a is 2, and when R 1 is alkylene, a is 1.