Photopolymerizable compositions featuring novel co-initiators

Details Photopolymerizable compositions featuring novel co-initiators Photopolymerizable compositions featuring novel co-initiators

C - Chemistry, Metallurgy

08

F

96/150, 117/23,

C08F 2/50 (2006.01) C07D 311/12 (2006.01) C08J 3/28 (2006.01)

Patent

CA 1137695

Abstract A photopolymerizable composition, element and method of photopolymerizing are disclosed wherein the com- position comprises an addition polymerizable compound con- taining ethylenic unsaturation and a co-initiator including a photopolymerization activator and a coumarin having an absorption maximum between about 250 and about 550 nm and a Image substituent in the 3-position wherein R1 is alkyl or alkenyl having 1-12 carbon atoms, or a carbocyclic or hetero- cyclic group having 5-20 nuclear carbon and hetero atoms, the coumarin and the activator being present in an amount sufficient to provide, when the composition is coated, dried and exposed to a medium pressure mercury light source, a speed that is at least about one-fifth that of the same composition coated, dried and exposed identically except with a co-initiator consisting of Michler's ketone and benzophenone.

336005

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