Patent ID: 6841336
Filing Date: 2005-01-11
Classification: G03F

Abstract:
1. A plate-making method of a lithographic printing plate, which comprises exposing imagewise a photosensitive lithographic printing plate and developing the exposed photosensitive lithographic printing plate with a developing solution, wherein the photosensitive lithographic printing plate comprises an aluminum support and a photosensitive layer comprising a photosensitive composition of photopolymerization type, the composition containing: a compound having a nitrogen atom and an ethylenically unsaturated double bond; a photopolymerization initiator; and a polymer binder; and the developing solution contains (1) an inorganic alkali agent and (2) a nonionic surface active agent having a polyoxyalkylene ether group and has a pH in a range of from 9 to 13.5 and an electric conductivity in a range of from 2 to 40 mS/cm.