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AssigneeToray Industries, Inc.
InventorsYasunori KUSE, Yuki KASE, Takejiro INOUE
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Disclosed is a waterless planographic printing plate precursor including at least a substrate, a heat sensitive layer and an ink repellent layer in this order, wherein the substrate has a white color layer or a white color surface, and wherein the heat sensitive layer includes at least (a) an infrared-absorbing dye having a maximum absorption wavelength of 700 to 1,000 nm, (b) a dye that changes color by proton acceptance, and (c) a proton-donating compound. The present invention provides a waterless planographic printing plate precursor capable of obtaining high contrast between the image area and the non-image area by exposure without the need for a special layer.
A waterless planographic printing plate precursor comprising at least a substrate, a heat sensitive layer and an ink repellent layer in this order, wherein the substrate has a white color layer or a white color surface, and wherein the heat sensitive layer comprises at least (a) an infrared-absorbing dye having a maximum absorption wavelength of 700 to 1,000 nm, (b) a dye that changes color by proton acceptance, and (c) a proton-donating compound.
A waterless planographic printing plate precursor comprising at least a substrate, a heat sensitive layer and an ink repellent layer in this order, wherein when at least a part of the waterless planographic printing plate precursor is irradiated with 100 mJ/cm2 of infrared rays, a range of reflection densities ΔDC between an exposed area and a non-exposed area measured from the ink repellent layer side using a cyan-filtered spectrophotometer is 0.30 or more.
Dependencies are inferred from the claim text.