| abstract |
A lithographic printing plate material capable of infrared laser exposure that excels in sensitivity, being fair in developer resistance (film thinning resistance), and that excels in temporal stability (sensitivity variation resistance), suppressing the occurrence of incidental color. There is provided a lithographic printing plate material having a hydrophilic support and, superimposed thereon, a lower layer and an upper layer each containing an alkali-soluble resin, characterized in that the upper layer contains a visible image agent while the lower layer contains an acidolytic compound and an acidogenic agent. |