| 摘要 |
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): <CHEM> wherein X<1> represents a halogen atom or X<2>-L<1> (wherein X<2> represents an oxygen atom or a sulfur atom and L<1> represents a hydrocarbon group having from 1 to 12 carbon atoms; and R<1> and R<2> each independently represents a hydrocarbon group having from 1 to 12 carbon atoms, and R<1> and R<2> 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 at a maximum absorption wavelength in a range of wavelengths of from 760 nm to 1200 nm is in a range of from 0.5 to 1.2 as measured by a reflection measurement method. Both the recording material and the precursor enable direct recording from digital data by using an infrared-beam-emitting laser, and have excellent print durability which enables a large number of good prints to be obtained without carrying out heat processing after image formation. |
