Method of forming a positive image on a lithographic printing plate using an infrared laser

摘要

A method for forming a positive image by exposing a photosensitive lithographic printing plate with an infrared laser in the range of 700 to 1200 nm, the photosensitive lithographic printing plate having a substrate and a positive photosensitive composition thereon with the positive photosensitive composition having defined components including an alkali aqueous solution soluble polymer compound or resin.