Lithographic Printing Plate Precursor And Process For Producing Lithographic Printing Plate

Abstract: Provided is a lithographic printing plate precursor which is inhibited from generating development scum without lowering the development speed and which gives a lithographic printing plate having excellent nonfouling properties and ink receptibility. Also provided is a process for producing a lithographic printing plate using the lithographic printing plate precursor. The lithographic printing plate precursor comprises a support and formed thereon in the following order a photosensitive layer and a protective layer wherein the photosensitive layer comprises a sensitizing dye a polymerization initiator a polymerizable compound and a binder polymer and the protective layer comprises a polymer which comprises repeating units represented by general formula (1) and repeating units represented by general formula (2) and in which the sum of the repeating units represented by general formula (1) and the repeating units represented by general formula (2) accounts for 90 mol% or more of all repeating units that constitute the polymer. In general formulae (1) and (2) R and R each represent a hydrogen atom or methyl. R and R may be the same or different and each represent a hydrogen atom methyl or ethyl. R represents a C unsubstituted alkyl group or an alkyl group substituted by an aromatic or heterocyclic group.

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