| abstract |
The present invention relates to a heat mode-compatible positive lithographic printing plate capable of forming an image with excellent contrast, capable of forming an image with excellent contrast, having excellent printing durability and chemical resistance, and excellent sensitivity. Provide the original version. A hydrophilic support includes a lower layer containing a water-insoluble and alkali-soluble resin, a novolac-type phenol resin containing phenol as a structural unit, and a photothermal conversion agent, and is soluble in an alkaline aqueous solution by infrared laser exposure. It is characterized by sequentially laminating an increasing image recording layer. [Selection figure] None |