ORIGINAL PLATE FOR LITHOGRAPHIC PRINTING

摘要

PROBLEM TO BE SOLVED: To provide a heat mode-type original plate for lithographic printing with such advantages that an original plate can be easily made up without the necessity to perform a development process and also can be made up by directly mounting the original plate on a printing machine and is almost free from print scumming on a printed surface and shows excellent resistance to plate wear with the high coating film strength of an image recording layer. SOLUTION: This original plate for lithographic printing has a hydrophilic image recording layer which is composed of a hydrophilic integrated resin containing a hydrophobic precursor with a hydrophilic graft chain on the surface and becomes thermally hydrophobic, formed on a support. Especially the original plate has a photothermal conversion agent contained in at least either of the image recording layer, an adjacent layer or the support.