Abstract
Photoinitiation systems were investigated to obtain visible light sensitive photopolymerizable composition with high sensitivity to be applied to the argon laser scanning imaging systems. Each of thioxanthene dye (Dye-1), coumarin dye (Dye-2) and merocyanine dye (Dye-3) was combined with various amounts of diphenyl iodonium cloride (DPI) and/or N-phenylglycine (N-PhG) as the radical precursors to form the photoinitiation systems. A layer of the mixture of a photoinitiation system, polyfunctional acrylic monomer and acrylic polymer was applied on an aluminium plate to prepare a test plate for evaluation. In orders to eliminate inhibition of polymerization by oxygen, a poly- (vinyl alcohol) layer was applied on the top of the test plate. The sensitivity of the test plates containing initiation systems of dye/DPI/N-PhG were approximately five times as high as those containing dye/DPI or dye/N-PhG in every kind of dye. The same tendency was observed in image formation with an argon laser scanning imaging system using Dye-1-containing test plates. The minimum energy required to form gel of the Dye-1, Dye-2 and Dye- 3-containing system were 0.3, 0.2 and 1.7mJ/cm2 respectively.
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