Patent ID: 7138219
Filing Date: 2006-11-21
Classification: G03F

Abstract:
1. A planographic printing plate material comprising a hydrophilic support and provided thereon, a light sensitive layer and an overcoat layer in that order, wherein the light sensitive layer contains (a) an alkali soluble polymer, (b) a polymerizable compound having an ethylenically unsaturated bond, (c) a polymerization initiator, and (d) an anionic dye, wherein the polymerization initiator is a metallocene compound, and the anionic dye is represented by the following formula (1), Formula (1) wherein R 1 represents a substituted or unsubstituted alkyl group having a carbon atom number of from 4 to 18, a cycloalkyl group having a carbon atom number of from 4 to 18, or a substituted or unsubstituted aryl group having a carbon atom number of from 6 to 18; R 2 through R 11 independently represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having a carbon atom number of from 1 to 6, a cycloalkyl group having a carbon atom number of from 4 to 6, a substituted or unsubstituted aryl group having a carbon atom number of from 6 to 18 or —N(R 12 ) (R 13 ) in which R 12 and R 13 independently represent a substituted or unsubstituted alkyl group having a carbon atom number of from 1 to 6, a cycloalkyl group having a carbon atom number of from 4 to 6, or a substituted or unsubstituted aryl group having a carbon atom number of from 6 to 18; and Y + represents a hydrogen ion, an alkali metal ion or an onium ion.