PLATEMAKING METHOD OF LITHOGRAPHIC PRINTING PLATE, LITHOGRAPHIC PRINTING METHOD, LITHOGRAPHIC PRINTING PLATE AS WELL AS LITHOGRAPHIC PRINTING ORIGINAL PLATE FOR ON-MACHINE DEVELOPMENT

摘要

PROBLEM TO BE SOLVED: To make a lithographic printing plate having a high print wear by on-machine development and use it for printing.;SOLUTION: The lithographic printing original plate which has an image forming layer containing an infrared ray absorbent, a polymerization initiator, an ethylenic unsaturated polymerizable compound, and a substantially non-cross-linked modified polyvinyl alcohol having the side chain containing an ethylenic unsaturated bond, at least the ethylenic unsaturated polymerizable compound being packed in microcapsules and the modified polyvinyl alcohol being arranged outside the microcapsules and a hydrophilic support, is imagewise exposed to cross-link and cure the exposed region. Then, with the original plate being installed to the cylinder of a printer, the non-exposed region in the image forming layer is removed to make a lithographic printing plate and used for printing.;COPYRIGHT: (C)2005,JPO&NCIPI