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 Ar 1 and Ar 2 is an optionally substituted heteroaromatic group.