A HEAT-SENSITIVE POSITIVE-WORKING LITHOGRAPHIC PRINTING PLATE PRECURSOR

摘要

A heat-sensitive positive-working lithographic printing plate precursor comprising (1) a support having a hydrophilic surface or which is provided with a hydrophilic layer, (2) a heat-sensitive coating, comprising an IR absorbing agent, a phenolic resin and a first polymer, characterised in that said first polymer is an alkaline soluble polymer comprising a monomeric unit having a structure according to formula I or formula II wherein at least one of the aromatic groups Ar¹ and Ar² is an optionally substituted heteroaroraatic group.