| 摘要 |
Aminoketone-substituted coumarin sensitizers having quaternary amine substituents are described which have very high photosensitivity, and are useful in moderate pH aqueous-developable printing plates. The aminoketone-substituted coumarin sensitizers are described by the formula: <IMAGE> wherein R1 and R2 each represent an alkyl group having 1 to 6 carbon atoms, and R3 and R4 each represent hydrogen; or at least one of R1 and R3 or R2 and R4 together represent an alkylene group having 2 to 4 carbon atoms, R5 represents an alkyl group having 1 to 6 carbon atoms or H, R6 represents an alkylene group having 1 to 16 carbon atoms, an oxyalkylene group having form 1 to 16 carbon atoms, or a poly(oxyalkylene) group in which said alkylene group has 2 to 4 carbon atoms and the number of oxygen atoms is a positive integer less than or equal to four, R7, R8, and R9 each independently represent an alkyl group having 1 to 6 carbon atoms, or any two of R7, R8, and R9 taken together represent an alkylene group having 4 to 6 carbon atoms; R7, R8, and R9 taken together with the N atom to which they are bonded represent a quinuclidinio group, or R6, taken together with R7, R8, or R9 represent a five, six, or seven membered heterocyclic ring group, and X- represents any anion. Photopolymer compositions comprising a free-radically polymerizable material, a photoinitiator, and an aminoketone-substituted coumarin sensitizer having quaternary amine substituents, are also disclosed.
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