Method for preparing lithographic printing plate

摘要

The present invention provides a method for preparing a lithographic printing plate comprising; imagewise exposing a negative-working presensitized plate useful for making a lithographic printing plate having a photosensitive layer comprising (a) a diazo resin and (b) an organic polymer compound on a substrate and developing the imagewise exposed plate with an aqueous alkaline developer comprising at least one alkanolamine in an amount of 200 mmol/L or more. The present invention shows an effect that the lithographic printing plate prepared by the method does not deteriorate in printing durability and in sensitivity even when the plate is developed with a developer having a high developability.