| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat sensitive lithographic printing original plate having an aluminum plate as a support having improved sensitivity capable of printing by directly mounting in a printer without processing after an exposure. SOLUTION: The heat sensitive lithographic printing original plate comprises an ink acceptive layer and a hydrophilic layer containing a colloidal particle-like oxide or hydroxide of at least one element selected from beryllium, magnesium, aluminum, silicon, titanium, boron, germanium, tin, zirconium, iron, vanadium, antimony and a transition metal on an aluminum support. In this case, at least one of the acceptive layer and the hydrophilic layer contains a photothermal conversion agent. Further, the support has an anodized film having 2 g/m2 or more and is sealed to a sealing rate of 50 % or more. |
