Method of producing planographic printing plate and planographic printing plate

摘要

A planographic printing plate precursor includes a substrate having a hydrophilic surface; and two or more recording layers provided on the substrate and each independently containing an alkali-soluble resin, in which at least one of the two or more recording layers is a positive-working recording layer including an infrared absorbing agent, and in which, of the two or more recording layers, a recording layer provided in closest proximity to the substrate includes a resin (A) having an onium salt structure and a (meth)acrylic resin (B) having at least one repeating unit selected from a structural unit represented by the following Formula (I) or a structural unit represented by the following Formula (II):

wherein, R¹ represents a hydrogen atom or an alkyl group; Z represents -O- or -N(R²)- wherein R² represents a hydrogen atom, an alkyl group, or the like; Ar¹ and Ar² each independently represent an aromatic group, and at least one of Ar¹ or Ar² is a heteroaromatic group; and a and b each independently represent 0 or 1.