Patent ID: 6794120
Filing Date: 2004-09-21
Classification: G03F

Abstract:
A method of processing a light sensitive planographic printing plate precursor containing a support, and provided thereon, a photopolymerizable light sensitive layer and an overcoat layer in that order, the photopolymerizable light sensitive layer containing a compound having an ethylenic addition polymerizable group, a photo-initiator and a polymer binder, the method comprising the steps of:imagewise exposing the light sensitive planographic printing plate precursor; pre-washing the exposed light sensitive planographic printing plate precursor with washing water; and developing the pre-washed light sensitive planographic printing plate precursor with a developer containing an alkali metal-containing compound, wherein the pre-washing step comprises first washing the exposed light sensitive planographic printing plate precursor with a first water being water which has been used at least one time for washing the exposed light sensitive planographic printing plate precursor, and then washing the resulting precursor with a second water being fresh water which has not been used before for washing the exposed light sensitive planographic printing plate precursor.