Benzophenone initiators for the photopolymerization of unsaturated compounds
AssigneeEastman Kodak Company
InventorsJames G. Pacifici, Richard H. S. Wang, Gordon C. Newland
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Abstract
This invention relates to 3,4-bis(halomethyl) benzophenone photoinitiators and these initiators admixed with unsaturated photopolymerizable compounds. When such compositions are irradiated by ultraviolet light, the benzophenone derivatives split off free radicals which initiate the photopolymerization of the unsaturated photopolymerizable compounds.
Claims3
A composition comprising a photopolymerizable ethylenically unsaturated compound having admixed therewith, as a photo-polymerization initiator, about 0.1 to about 10% by weight, based on the weight of the unsaturated compound, of at least one benzophenone derivative of the formula ##STR6## wherein R is hydrogen, chloro, methoxycarbonyl, methyl, t-butyl, and R.sup.1 and R.sup.2 are the same or different and each is -CH.sub.2 X, CHX.sub.2, or CX.sub.3 wherein X is chloro or bromo.
Dependencies are inferred from the claim text.