Title: Method for preparation of lithographic printing plate having addition polymerized areas and binder areas

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Abstract: A lithographic printing plate is prepared from a layer of a photopolymerizable composition comprising an oleophilic macromolecular organic binder and a leachable hydrophilic ethylenically unsaturated compound by exposing the layer and then leaching the compound from the unexposed areas by treating with a suitable developing solvent, preferably water, producing an oleophilic surface. A similar plate may be prepared from a composition containing a hydrophilic binder and oleophilic leachable compound by imagewise exposure and solvent leaching producing an oleophilic surface in exposed areas and a hydrophilic surface in unexposed areas.


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