| abstract |
(57) [Problem] To be able to directly record digital data from a computer or the like using an infrared laser, does not require a heating treatment after imagewise exposure, and has a heat mode-compatible negative type excellent in recording sensitivity. Provide lithographic printing plate precursors. SOLUTION: On a support, (A) a photothermal conversion agent, (B) It is characterized by including a compound having a polymerizable unsaturated group and (C) a photosensitive layer containing an onium salt having a divalent or higher valent anion as a counter ion and recordable by an infrared laser. Examples of the onium salt include diazonium salts, iodonium salts, and sulfonium salts. The polyvalent anion structure is preferably a divalent or more and hexavalent or less anion, and the structure of the anion portion may be the same or different. Good. |