| 摘要 |
<p>A positive planographic printing plate which has high sensitivity, limited reduction in sensitivity over time and high stability over time. The positive planographic printing plate has a light-sensitive layer formed on a support. The light-sensitive layer includes a light-sensitive image-forming material and a material which absorbs light and generates heat. The light-sensitive image-forming material contains a novolac resin having a xylenol monomer. It is preferable that, if a proportion of the xylenol-containing novolac resin in alkali-soluble resin that forms the light-sensitive layer is Y% by weight and a content of the xylenol monomer in the novolac resin is X% by weight, X x Y is 500 or more (X x Y >/= 500).</p> |
