To provide a planographic printing plate for laser scanning exposure having excellent workability and economic efficiency and suitable for a CTP (computer-to-plate) system, and moreover, to provide a planographic printing plate which enables drawing with violet laser, which prevents changes (crystallization) in the aggregation state of a sensitizing dye for a long period of time, and which stably shows high sensitivity.
In the photopolymerizable planographic printing plate having a photopolymerizable photosensitive layer on a supporting body, the photopolymerizable photosensitive layer contains: a polymerizable compound having at least an ethylenically unsaturated group; a sensitizing dye; and a binder resin. The sensitizing dye has the absorption maximum in the range of 300 nm to 500 nm and has the solubility parameter (SP value) in the range expressed by |SP value of the sensitizing dye - SP value of the mixture of the polymerizable compound having an ethylenically unsaturated group and the binder resin|≤8 MPa1/2.
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Yuriko Hamada
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