Planographic printing original plate
AssigneeFuji Photo Film Co., Ltd.
InventorsAkio Oda, Ippei Nakamura, Tomotaka Tsuchimura
Life of this patent
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Abstract
A positive-type planographic printing original plate for direct plate-making with an infrared laser, with excellent latitude in forming an image by development, and excellent flaw resistance. The planographic printing original plate includes, on a support, a positive-type recording layer whose solubility with respect to an alkaline aqueous solution is increased by infrared laser exposure. The recording layer contains an alkali-soluble resin, which has a fluorine atom in the molecule, and an infrared absorbing agent. The alkali-soluble resin can be provided by introducing at least one substituent having a fluorine atom to a known alkali-soluble polymer compound.
Claims14
A positive-type planographic printing original plate comprising:
- a support;
- and
- on the support, a positive-type recording layer comprising an infrared absorbing agent and a water-insoluble, alkali-soluble resin which has a fluorine atom in a molecule thereof, wherein solubility of the positive-type recording layer is increased relative to an alkaline aqueous solution after infrared laser exposure.
Dependencies are inferred from the claim text.