Patent ID: 8828646

Claim:
A lithographic printing plate precursor comprising a support, an image-recording layer containing a radical polymerization initiator and a radical polymerizable compound, and an overcoat layer containing a polymer resin, wherein the polymer resin has a cloud point in an aqueous solution and includes a monomer unit containing at least any of an amino group and an amido bond, in this order, wherein the monomer unit containing at least any of an amino group and an amido bond is represented by any of the following formulas (1) to (3): wherein, in formula (1), R 1 represents a hydrogen atom or a methyl group, and R 2 and R 3 each independently resents a hydrogen atom, a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, a sec-butyl group, an isobutyl group or a tert-butyl group, provided that at least one of R 2 and R 3 represents a methyl group, an ethyl group, a n-propvl group, an isopropyl group, a n-butyl group, a sec-butyl group, an isobutyl group or a tert-butyl group; in formula (2), R 4 represents a hydrogen atom or a methyl group R 5 and R 6 each independently represents a hydrogen atom or an alkoxyalkyl group represented by formula (A), m represents an integer from 1 to 3, n represents an integer from 1 to 3, and m+n is 2, 3 or 4, provided that at least one of R 5 and R 6 represents an alkoxyalkyl group represented by formula (A); and in formula (3), R 7 represents a hydrogen atom or a methyl group, and R 8 and R 9 each independently represents a hydrogen atom, a methyl group, an ethyl group, a n-propyl group or an isopropyl group, provided that at least one of R 8 and R 9 represents a methyl group, an ethyl, a n-propyl group or an isopropyl group.