Patent ID: 8142978

Claim:
A planographic printing plate precursor comprising: a support; and an image recording layer that is provided on the support and is configured to form an image as a result of supply of printing ink and dampening water at a printing press and removal of an unexposed portion after exposure, the image recording layer comprising: an infrared ray absorbing agent (A); a polymerization, initiator (B); a polymerizable compound (C); and a compound (D) represented by the following Formula (I): wherein, in Formula (I), at least one of R 1 to R 3 represents —(CH 2 CH 2 O) n —R 4 , while the remainder of R 1 to R 3 respectively independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or R 5 —COOH; R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; n represents an integer of 1 to 20; and R 5 represents an alkylene group having 1 to 6 carbon atoms.