PLANOGRAPHIC PRINTING PLATE PRECURSOR

PROBLEM TO BE SOLVED: To provide a planographic printing plate precursor excellent in image reproducibility, printing durability and chemical resistance. SOLUTION: The planographic printing plate precursor has, on a support, two or more positive recording layers respectively containing a resin and a...

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1. Verfasser: KAWACHI IKUO
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a planographic printing plate precursor excellent in image reproducibility, printing durability and chemical resistance. SOLUTION: The planographic printing plate precursor has, on a support, two or more positive recording layers respectively containing a resin and an infrared absorber and respectively having a solubility with respect to an aqueous alkali solution that is increased by exposure to infrared laser light, wherein: of the two or more positive recording layers, a positive recording layer that is nearest to the support is a layer containing two or more resins including a polymer comprising a structural unit represented by general formula (I), and at least one of the two or more resins constitutes a dispersion phase in the layer. In the general formula (I), R1-R3each independently represent a hydrogen atom or a substituted or unsubstituted alkyl group; R4and R5each independently represent a substituted or unsubstituted alkyl group or the like, and R4and R5may bond to each other to form a ring structure. COPYRIGHT: (C)2009,JPO&INPIT