Compositions with organohalogen compound and diazonium salts as photoinitiators of epoxy compounds in photo-polymerization

Claim 1

A polymerizable composition consisting of: A monomeric or prepolymeric epoxide material or mixture thereof, said epoxide material being polymerizable to higher molecular weights cationically through the action of a cationic catalyst and being selected from the group consisting of glycidyl ethers of bisphenol A; epoxy-cycloalkanes; alkylene oxides; monoglycidyl ethers of the formula ##STR5## wherein R is alkyl or aryl; epoxy-esters; epoxy phenol or cresol novolacs; epoxy-vinyls; halogenated epoxides and bis(epoxy alkyl) ethers of alkylene glycols and mixtures thereof; a radiation-sensitive catalyst precursor which decomposes upon exposure to irradiation to provide an active catalyst effective to initiate cationic polymerization of said epoxide material, said precursor being present in an amount by weight equal to from about 1 to about 50% of the epoxide material and being the combination of (1) an organohalogen selected from the group consisting of iodoform, bromoform, carbon tetrabromide and α,α'-dibromoxylene and (2) an amino-aryl diazonium salt of a complex halogenide which releases a Lewis Acid upon exposure to irradiation, the anion of said complex halogenide being selected from the formula [MX n+m] -m wherein M is Fe, Sn, P, As, Sb, B and Bi; X is halogen, m is the net charge on the complex halogenide and n is the oxidation state of M, the relative proportion in said combination being from about 1 to about 6 moles organohalogen per mole of amino-aryl diazonium complex.