| 摘要 |
A high speed visible light sensitive photopolymerizable composition useful for printing plates comprising (a) at least one free radically polymerizable monomer having at least one ethylenically unsaturated group, (b) an ethylenically unsaturated free radically polymerizable oligomer having carboxyl groups substituted thereon, (c) a visible light sensitizing initiator system for free radical polymerization comprising an initiator selected from diaryl iodonium salts, halogenated triazines, and triaryl iodonium salts which are photoinitiating electron acceptor compounds having a reduction potential in the range 0.0 to -1.5 eV, spectrally sensititzed with at least one merocyanine sensitizer containing a constrained alkylamino group, preferably a julolidinyl group.
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