ORIGINAL PLATE FOR LITHOGRAPHY

摘要

PROBLEM TO BE SOLVED: To give an original plate for lithography having good on-press developability and a high plate wear resistance and excellent age stability by starting printing by mounting the plate directly in a printer after its exposure. SOLUTION: The original plate for the lithography comprises a heat sensitive layer having microcapsules each containing a compound having a functional group reacting by a heat on a hydrophilic support. In this case, a compound to become the other side of a thermal reaction of the compound having the group is contained in the heat sensitive layer or a layer adjacent to the heat sensitive layer in a state in which the compound is contained in another microcapsule.