| 摘要 |
A method for preparing a lithographic printing plate includes treating a lithographic printing plate precursor including 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-(CO2H)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.
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