Patent ID: 8088562
Filing Date: 2012-01-03
Classification: B41C,B41N,G03F

Abstract:
1. A method for making a lithographic printing plate comprising the steps of: providing a heat-sensitive lithographic printing plate precursor including a heat-sensitive coating on a support having a hydrophilic surface or which is provided with a hydrophilic layer; image-wise exposing the precursor with IR-radiation or heat; and developing the image-wise exposed precursor with an alkaline developing solution; wherein an anti-sludge agent is present in the precursor or in the developing solution or in the precursor and the developing solution, and wherein the anti-sludge agent is a heteroaromatic compound, including a —NH— group wherein the hydrogen is capable of being deprotonated in the alkaline developing solution, selected from the group consisting of an optionally substituted benztriazole, 1,2,3-triazole, tetrazole, or indazole compound; and during or after the developing step, a replenishing solution including the anti-sludge agent is added to the developing solution.