PRODUCTION OF LITHOGRAPHIC PRINTING PLATES IN A DRY MANNER

摘要

Heat-developable silver-based photosensitive imaging element comprising a heat-reducible organic silver salt, a photosensitive silver halide, a developing agent, and a releasing compound that upon reaction with either the reduced or the oxidized form of said developing agent is capable of releasing a hydrophobizing agent. The invention also relates to a method for producing a lithographic printing plate comprising image-wise exposing a said imaging element, bringing said exposed element in face-to-face contact with an oleophobic surface of a printing plate precursor, heating said imaging element while in contact or before being brought in contact with said oleophobic surface to cause reduction of said organic silver salt and to cause the release of said hydrophobizing agent from said releasing compound, allowing said hydrophobizing agent to diffuse to said oleophobic surface to render said surface image-wise oleophilic, and separating the resulting lithographic printing plate from said imaging element.