| abstract |
A negative-type on-press developable lithographic printing plate precursor is disclosed, comprising a hydrophilic support having thereon a heat-sensitive layer containing a microcapsule containing a compound having a functional group capable of reacting by heat, and further containing a low molecular compound which reacts with said compound having a functional group contained in said microcapsule, wherein said microcapsule may be a microcapsule having an outer wall capable of rupturing or incapable of rupturing by heat used for the image formation and a light-to-heat converting material is contained in the heat-sensitive layer or in a layer adjacent thereto. |