Patent ID: 7273692

Claim:
A planographic printing plate material comprising a support and provided thereon, an image formation layer containing a colorant (a) having an absorption band in a wavelength region of from 700 to 1200 nm, a polymerization initiator (b) and a polymerizable ethylenically unsaturated compound (c), wherein the polymerizable ethylenically unsaturated compound (c) has a urethane bond in the molecule and wherein the polymerization initiator (b) is a compound represented by the following formula (1), R 1 —CX 2 —(C═O)—R 2 Formula (1) wherein R 1 represents a hydrogen atom, a bromine atom, or a chlorine atom; R 2 represents a hydrogen atom or a first monovalent organic substituent, provided that R 1 and R 2 may combine with each other to form a ring; and X represents a bromine atom or a chlorine atom.