| 摘要 |
Disclosed are a planographic printing plate material and a planographic printing plate preparing process, the planographic printing plate material comprising a support and provided thereon, an image formation layer containing a colorant (a) having an absorption band in a wavelength region of from 700 to 1200 nm, a polymerization initiator (b) and a polymerizable ethylenically unsaturated compound (c), the image formation layer being an outermost layer, wherein the polymerization initiator (c) is a compound represented by the following formula (1), <?in-line-formulae description="In-line Formulae" end="lead"?>R<SUP>1</SUP>-C(X)<SUB>2</SUB>-(C-O)-(Y)<SUB>n</SUB>-R<SUP>2</SUP> Formula (1) <?in-line-formulae description="In-line Formulae" end="tail"?>
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