Patent ID: 8151705

Claim:
A method for preparing a lithographic printing plate comprising treating a lithographic printing plate precursor comprising a hydrophilic support and an image-forming layer containing the following (i) to (iii) with an aqueous solution having a buffering ability: (i) a binder polymer comprising a repeating unit having a structure represented by the following formula (1), (ii) an ethylenically unsaturated compound, and (iii) a polymerization initiator, P-L-(CO 2 H) n (1) wherein P represents a part constituting a main chain skeleton of the polymer, L represents an (n+1) valent connecting group, and n represents an integer of 1 or more, and wherein the aqueous solution having a buffering ability comprises as buffering agent a water-soluble amine compound and an ion of the amine compound.