Patent ID: 8221959
Filing Date: 2012-07-17
Classification: B41C,G03F

Abstract:
1. A lithographic printing plate precursor comprising: an aluminum support having a hydrophilic surface; and a photosensitive layer comprising a binder polymer having an acid value of 0.3 meq/g or less, wherein the photosensitive layer comprises a pigment dispersed with a pigment dispersant which is free from a —COOH group, a —PO 3 H 2 group and a —OPO 3 H 2 group, and is a compound comprising (a) a unit having a functional group adsorbing to the pigment, the functional group being selected from groups represented by the following formulae, and (b) a unit having a functional group imparting dispersibility in an organic solvent: wherein R wherein the pigment dispersant has a weight average molecular weight of from 1,000 to 1,000,000; wherein the functional group imparting dispersibility in an organic solvent included in the unit (b) comprises a hydrocarbon group having 6 or more carbon atoms; wherein the lithographic printing plate precursor further comprises an undercoat layer between the aluminum support and the photosensitive layer, the undercoat layer comprising a compound having a polymerizable group, and wherein the undercoat layer does not comprise a pigment dispersed with the pigment dispersant.