Patent ID: 8124317

Claim:
A planographic printing plate precursor having an intermediate layer and an image forming layer in this order on a support, the intermediate layer comprising at least one copolymer comprising: a structural unit represented by the following Formula (1): wherein R 1 represents a hydrogen atom, a substituent having from 1 to 30 carbon atoms, or a halogen atom, L 1 represents a single bond or a (n+1)-valent connecting group, and n represents an integer of from 1 to 10, a structural unit represented by the following Formula (2): wherein R 2 represents a hydrogen atom, a substituent having from 1 to 30 carbon atoms, or a halogen atom, L 2 represents a single bond or a (m+1)-valent connecting group, X represents a carboxylate ion, M represents a counter cation necessary for neutralization of charge, and m represents an integer of from 1 to 10, and a structural unit represented by the following Formula (3): wherein R 3 represents a hydrogen atom, a substituent having from 1 to 30 carbon atoms, or a halogen atom, and Y represents a substituent comprising a carboxylate ester group and having from 2 to 30 carbon atoms; wherein the carboxylate ester group of Y is at least one selected from the group consisting of methoxycarbonyl, ethoxycarbonyl, propyloxycarbonyl, isopropyloxycarbonyl, butyloxycarbonyl, hexyloxycarbonyl, octyloxycarbonyl, cyclohexyloxycarbonyl, 2-ethylhexyloxycarbonyl, benzyloxycarbonyl, 2-hydroxyethoxycarbonyl, 2-methoxyethoxycarbonyl and phenoxycarbonyl.