| abstract |
(57) [Summary] [Problem] By recording using an infrared laser, Provided is a positive type lithographic printing plate image recording material that can be directly made from digital data from a computer or the like, has excellent storage stability, and can be handled even under white light. SOLUTION: This positive image recording material contains at least a diazonium salt represented by the following formula, an infrared absorber, and an alkali-soluble binder. Embedded image R 1 and R 2 each independently represent a substituted or unsubstituted hydrocarbon group having 20 or less carbon atoms, and R 4 and R 5 each independently represent hydrogen or a substituted or unsubstituted hydrocarbon group having 20 or less carbon atoms. And R 3 represents a hydrogen atom, a substituted or unsubstituted alkyloxy group having 20 or less carbon atoms, an aryloxy group, or an aralkyloxy group. X is F, Cl, Br, I, ClO 4 , BF 4 , PF 6 , SbF 6 , As F 6 represents a counter anion selected from alkyl or aryl sulfonate ions. |