Patent ID: 8714088
Filing Date: 2014-05-06
Classification: B41C,G03F

Abstract:
1. A lithographic printing plate precursor comprising: an image-recording layer; and a protective layer comprising a stratiform compound, wherein the protective layer comprises a polymer containing, as a repeating unit, a structural unit having an ammonium structure, wherein the structural unit having an ammonium structure is a structure represented by the following formula (1): wherein R wherein the polymer containing as a repeating unit, a structural unit having an ammonium structure further contains a structural unit represented by the following formula (2): wherein R 21 represents a hydrogen atom, an alkyl group or a halogen atom, and R 22 represents an ester group, an amido group, a phenyl group which may have a substituent, or a group containing a polyalkyleneoxy group, wherein the image-recording layer comprises a sensitizing dye, a polymerization initiator, and a polymerizable monomer, wherein a molar ratio of the structural unit represented by the formula (1) to the structural unit represented by formula (2) in the polymer is from 10:90 to 50:50, and wherein the polymer containing, as a repeating unit, a structural unit having an ammonium structure is contained only in the protective layer.