| abstract |
A negative-type recording material recordable by the irradiation of an infrared ray is provided. The recording material includes (A) an infrared absorbent, (B) an onium salt, (C) a radical polymerizing compound, and (D) a binder polymer. The infrared absorbent (A) includes at least one cyanine dye having a partial structure represented by following formula (I):wherein X1 represents a halogen atom or X2-L1 (wherein X2 represents an oxygen atom or a sulfur atom and L1 represents a hydrocarbon group having from 1 to 12 carbon atoms; and R1 and R2 each independently represents a hydrocarbon group having from 1 to 12 carbon atoms, and R1 and R2 may bind together to form a ring structure). Also provided is a negative-type lithographic printing plate precursor including a support having formed thereon a photosensitive layer containing (A) an infrared absorbent, (B) an onium salt, (C) a radical polymerizing compound, and (D) a binder polymer. Absorbance of the photosensitive layer is described. |