Photopolymerization co-initiator systems

Claim 1

In a process for photopolymerizing a monomeric ethylenically unsaturated compound by irradiating the compound in the presence of a photoinitiator, the improvement which comprises using as the photoinitiator a co-initiator system which consists essentially of (a) about 1-30 parts of at least one compound having the formula ##SPC3## wherein R, R', and R" is each hydrogen, C 1 -14 alkyl, aryl, alkylaryl, alkoxy, aryloxy, halogen, halogenated C 1 -14 alkyl, halogenated aryl, amino, or amino N-substituted with alkyl, aryl, β-alkanol, or a combination of these, and may be the same or different; and R"' is hydrogen, C 1 -14 alkyl, halogenated alkyl, aryl, --OZ where Z is C 1 -14 alkyl or aryl; ##EQU3## where Y is hydrogen, C 1 -14 alkyl, aryl, or alkylaryl and Q is hydrogen, C 1 -14 alkyl, aryl, alkylaryl, alkoxy, or aryloxy: or ##SPC4## wherein R, R', and R" is each hydrogen, C 1 -14 alkyl, aryl, alkylaryl, alkoxy, aryloxy, halogen, halogenated C 1 -14 alkyl, halogenated aryl, amino, or amino N-substituted with alkyl, aryl, β-alkanol, or a combination of these, and may be the same or different; (b) about 1-30 parts of at least one compound having the formula ##EQU4## wherein X is nitrogen, phosphorus, arsenic, bismuth, or antimony and R, R', and R" is each alkyl, hydroxyalkyl, aryl, aralkyl, or alkaryl and may be the same or different and one or both of R and R" may be hydrogen; and (c) 1-30 parts of at least one halogenated hydrocarbon.