Dioxolane derivatives and use as photoinitiators

Claim 1

Compounds having the general formula: ##STR3## wherein R 1 and R 2 are each organic radicals selected from the group consisting of vinyl, hydroperoxy, alkyl or alkenyl groups of up to about 16 carbon atom length, cycloaliphatic groups of lower than 210 molecular weight, phenyl, naphthyl, phenoxy, benzoyl, naphthoxyl, phenylcarboxy, and substituted aliphatic groups of up to 200 molecular weight, and Ar 1 and Ar 2 are each selected from the group consisting of phenyl, naphthyl, non-sterically hindered substituted phenyl, and non-sterically hindered substituted naphthyl in which each substituent is a radical selected from the group consisting of amino, nitro, chloro-, bromo-, iodo-, fluoro-, lower alkylamino-, anilino-, di- lower alkylamino-, diphenylamino, lower alkoxy, carboxy, hydroxy, sulfonyl, acetyl, propionyl, aldehydro, acetoxy, propionoxy, amido, lower alkylamido, vinyl, lower alkenyl, lower alkynyl, lower alkyl, phenyl, benzyl, naphythyl, cyclohexyl, cyclopentyl, lower alkyl amido, di- lower alkyl amido, phenyl amido, and diphenyl amido with the proviso that when Ar 1 and Ar 2 are phenyl or lower alkyl-substituted phenyl and one of R 1 and R 2 is lower alkyl, the other may not be lower alkyl, cycloalkyl or phenyl.