To provide an original plate for heat-sensitive lithographic printing which can be directly mounted on a printing machine without processing after exposure to light and can be used for printing and has good press developing properties, high sensitivity, high press wear properties, good stain resistance on printing and good ink wiping properties.
The original plate for heat-sensitive lithographic printing with a heat-sensitive layer containing finely divided particles (a) with a heat-reactive functional group or microcapsules (b) encapsulating a compound with a heat- reactive functional group on an aluminum substrate with an anodized film is characterized by that micropores of the anodized film are pore-wide-treated and is immersion-treated in a water solution containing a hydrophilic compound.
MAEMOTO KAZUO
HOTTA HISASHI
