Patent ID: 7306898

Claim:
A planographic printing method comprising: providing a planographic printing plate precursor comprising a substrate and an image recording layer which is disposed on the substrate and comprises (A) an infrared absorber, (B) a polymerization initiator and (C) a polymerizable compound, the image recording layer being capable of recording with irradiation of infrared rays; imagewise exposing the planographic printing plate precursor with an infrared laser; and supplying oil-based ink and an aqueous component to the exposed planographic printing plate precursor without any development treatment, so as to print an image, wherein a region of the planographic printing plate precursor that has not been exposed with an infrared laser is removed during the printing, and the polymerizable compound of (C) is represented by the following formula (1): wherein Ar 1 represents an arylene group or a divalent heterocyclic group; R 1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; Z represents an n-valent organic linking group; and n denotes an integer of 1 to 20.