Patent ID: 6258510
Filing Date: 2001-07-10
Classification: G03F,Y10S

Abstract:
A photosensitive planographic printing plate precursor comprising an aluminum substrate surface-treated such that the center line surface roughness thereof (Ra) is in a range of from 0.30 .mu.m or more to 0.55 .mu.m or less and a photosensitive layer provided on the substrate and comprised of a photosensitive composition containing:(a) a water-soluble polymer,(b) a monomer or oligomer having at least one ethylenically unsaturated double bond capable of photopolymerization, and(c) a photopolymerization initiation system having .lambda..sub.max in a range of from 330 nm or more to 375 nm or less such that the light absorbance A at .lambda..sub.max and the absorbance B at 400 nm fulfill a relationship of B/A<0.1.