| 摘要 |
A photopolymerizable element, preferably a lithographic plate, is provided. This element comprises a substrate bearing a photopolymerizable layer having a weight of about 1 to about 90 mg/dm2, said layer comprising: (1) at least one ethylenically unsaturated diester polyhydroxy polyether of the formula <IMAGE> +TR <IMAGE> wherein R is H or CH3; R4 is H or an alkyl of 1-4 carbon atoms; n is 1-15; p is 0 or 1; and, when p is 1, R5 is H or CH3, and R6 is H, CH3 or C2H5; (2) an organic, radiation-sensitive, free-radical generating system comprising 2,4,5-triarylimidazolyl dimer and p-aminophenyl ketone; and (3) a macromolecular, organic, polymeric binder. A polymeric image is formed by imagewise exposing the layer to actinic radiation and then developing the resulting image such as by removing unexposed portions of the layer with a solvent.
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