LITHOGRAPHIC PRINTING PLATE MATERIAL, LITHOGRAPHIC PRINTING PLATE, METHOD FOR PREPARING LITHOGRAPHIC PRINTING PLATE, AND METHOD FOR PRINTING BY LITHOGRAPHIC PRINTING PLATE

摘要

This invention provides a lithographic printing plate material that is excellent in contamination recovery and halftone dot quality and is less likely to cause printing troubles by dust adherence or the like. The lithographic printing plate material comprises an aluminum base material and an image forming function layer provided on the aluminum base material, the image forming function layer containing a photo-thermal conversion material, a photopolymerizable compound, and a polymerization initiator. The lithographic printing plate material is characterized in that the image forming function layer in its non-image part can be removed by, after image-wise exposure, supplying a printing ink containing at least one material selected from polymerizable monomers and polymerizable oligomers. There are also provided a lithographic printing plate, a method for preparing the lithographic printing plate, and a method for printing by a lithographic printing plate.