EP3594009

A lithographic printing plate precursor including an image recording layer on a hydrophilic support, in which the image recording layer includes a polymerization initiator, an infrared absorbent, a polymerizable compound, and an acid color former, and the infrared absorbent includes a compound represented by Formula 1, as well as a method of preparing a lithographic printing plate by use of the lithographic printing plate precursor. In Formula 1, at least one of Ar₁or Ar₂has a group represented by the following Formula 2.        -X     Formula 2X represents a halogen atom, -C(=O)-X₂-R₁₁, -C(=O)-NR₁₂R₁₃, -O-C(=O)-R₁₄, -CN, -SO₂NR₁₅R₁₆, or a perfluoroalkyl group, X₂represents a single bond or an oxygen atom, R₁₁and R₁₄each independently represent an alkyl group or an aryl group, and R₁₂, R₁₃, R₁₅and R₁₆each independently represent a hydrogen atom, an alkyl group, or an aryl group.