(57) A positive planographic printing plate precursor that can be subjected to direct
plate making due to scanning exposure based on a digital signal and is excellent in
the reproducibility of a high definition image, the printing durability of a small-area
image portion such as a dot or a fine line, and chemical resistance, is provided.
The invention provides a planographic printing plate precursor formed by disposing,
on a support, a recording layer that includes a lower layer containing a polymer compound
having a constituent expressed by formula (I) below and an upper layer that contains
a water-insoluble and alkali-soluble resin and an infrared absorber and increases
in solubility to an alkaline aqueous solution under exposure,
wherein in formula (I), n represents an integer from 0 to 2 and A represents an aryl
group.
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