DETAILED DESCRIPTION OF THE PRESENT INVENTION The compositions curable by actinic radiation according to the invention can contain a polymerizable polymer in a reactive ethylenically unsaturated monomeric medium, a reactive polymer alone, a reactive monomer alone, or any of these combined with an inert solvent.
Additionally, the polymerizable composition can contain any of the pigments commonly used in photopolymerization techniques.
The process can be carried out by mixing a quantity of photoinitiating compound of the present invention with a photopolymerizable composition and exposing the resultant mixture to actinic radiation.
Alternatively, a one-component system comprising the photopolymerizable composition, the photoinitiator of the invention and, if desired, pigmentation, can be formed.
The photoinitiating compounds of the invention are suitable in the actinic light curing of unsaturated monomeric compounds either alone or as copolymerizable constituents of unsaturated polymer/monomer systems.
Such systems are composed of mixtures of conventional unsaturated polymers and unsaturated monomers.
Monomers which are useful in practicing the invention are acrylic, .
alpha.
-alkacrylic and .
alpha.
-chloroacrylic acid compounds such as esters, amides and nitriles.
Examples of such compounds are acrylonitrile, methacrylonitrile, methyl acrylate, ethyl acrylate, methyl methacrylate, isobutyl methacrylate, 2-ethylhexyl acrylate, methacrylamide and methyl .
alpha.
-chloroacrylate.
Also useful, although not preferred due to their slower rates of reactivity, are vinyl and vinylidene esters, ethers and ketones.
Additionally, compounds having more than one terminal unsaturation can be used.
Examples of these include diallyl phthalate, diallyl maleate, diallyl fumarate, triallyl cyanurate, triallyl phosphate, ethylene glycol dimethylacrylate, glycerol trimethylacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, trimethylolpropane triacrylate, methacrylic anhydride, and allyl ethers of monohydroxy or polyhydroxy compounds, such as ethylene glycol diallyl ether, pentaerythritol, tetraallyl ether, and the like
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