Patent ID: 7767380
Filing Date: 2010-08-03
Classification: G03F

Abstract:
1. A negative-working photopolymerization photosensitive lithographic printing plate precursor capable of conducting image recording with laser, comprising: a hydrophilic support; a photopolymerizable photosensitive layer comprising (i) a sensitizing dye having an absorption maximum in a wavelength range of from 360 to 450 nm, (ii) a hexaarylbiimidazole compound and (iii) an addition polymerizable compound having an ethylenically unsaturated double bond; and a protective layer, in this order, wherein the protective layer has oxygen permeability at 25° C. under one atmosphere of from 25 ml/m 2 ·day to 200 ml/m 2 ·day; wherein the protective layer comprises: polyvinyl alcohol having a saponification degree of 95% by mole or more; and a water-soluble resin having oxygen permeability higher than oxygen permeability of the polyvinyl alcohol having a saponification degree of 95% by mole or more, in a weight ratio of 9:1 to 1:9.