| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planographic printing plate precursor excellent in image reproducibility, printing durability and chemical resistance. <P>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), R<SP>1</SP>-R<SP>3</SP>each independently represent a hydrogen atom or a substituted or unsubstituted alkyl group; R<SP>4</SP>and R<SP>5</SP>each independently represent a substituted or unsubstituted alkyl group or the like, and R<SP>4</SP>and R<SP>5</SP>may bond to each other to form a ring structure. <P>COPYRIGHT: (C)2009,JPO&INPIT |
