| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative-working original plate of a planographic printing plate capable of direct plate making by recording from digital data of a computer or the like using IR emitting solid and semiconductor lasers and having good suitability to printing-out. SOLUTION: The original plate of a planographic printing plate is obtained by disposing a photosensitive layer comprising at least an IR absorbent, an onium salt, a radical-polymerizable compound, a binder polymer and an organic dye or a dye precursor which changes its color tone when exposed on a support. |
