Patent ID: 8192918
Filing Date: 2012-06-05
Classification: B41C

Abstract:
1. A lithographic printing plate precursor comprising a support which includes a hydrophilic surface or which is provided with a hydrophilic layer and a coating thereon, said coating comprising an IR absorbing agent, a contrast enhancing compound and a polymeric binder that alters its solubility in an alkaline developing solution upon exposure, wherein said contrast enhancing compound has the structure of formula I: wherein R R R R Q is one of the following groups which forms an optionally substituted 6 membered heteroaromatic ring, said groups being selected from the group consisting of **—C(T wherein * indicates a binding site to the carbon atom between the two nitrogen atoms and ** indicates a binding site to the carbon atom substituted by R wherein the symbol “O” in the middle of the ring comprising Q represents the pi-electrons necessary for the aromatic ring; T T wherein one of the groups of T wherein one of the groups of T wherein two groups, selected from the group consisting of T