Toray Industries, Inc.

Kunitaka Fujiyoshi

Kazuki Goto

Kimikazu Nagase

Gentaro Ohbayashi

Ken Kawamura

A directly imageable planographic printing plate that is high in image productivity and easy to check is produced by using a directly imageable planographic printing plate that comprises at least a substrate, a thermo-sensitive layer and a ink-repelling layer in this order, wherein the thermo-sensitive layer in the printing area contains a dye that has an absorption maximum in the range of 400 nm to 700 nm, and the difference between the reflected absorption of the non-printing area and the reflected absorption of the printing area, observed at the absorption maximum wavelength of the dye, is not less than 0.3 and not more than 2.0.

Directly imageable planographic printing plate and production method thereof

This invention provides a directly imageable planographic printing plate precursor with excellent image reproducibility without requiring any complicated process after irradiation with a laser beam. To solve the above problem, this invention is constituted as describe below. A directly imageable waterless planographic printing plate precursor, in which at least an ink acceptable layer and a silcone rubber layer are laminated in this order on a substrate, wherein when the printing plate precursor is measured by TG-GC/MS in a hellium current at a heating rate of 10&deg; C./min, a decomposition product is generated in a temperature range of 100&deg; C. to 200&deg; C. by 0.001 g/m to 1 g/m per plate area.

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Shiga, Japan

Kunitaka Fujiyoshi