Ink composition, inkjet recording method, printed material, process for producing lithographic printing plate, and lithographic printing plate
Ink composition, inkjet recording method, printed material, process for producing lithographic printing plate, and lithographic printing plate
Patent Agent: Sughrue Mion, PLLC - Washington, DC, US
Patent Inventor: Tomotaka Tsuchimura
Applicaton #: 20070039517
Class: 106014310 (USPTO)
Related Patents: Compositions: Coating Or Plastic, Miscellaneous, Corrosion Inhibiting Coating Composition, Contains Petroleum Oil Or A Fraction Thereof, Organic Nitrogen-containing Material, E.g., Amine, Amide, Etc.
02/22/07
An ink composition is provided that includes (a) an onium salt, a counteranion thereof having a volume of 1,000 ?รท3 or greater and (b) a cationically polymerizable compound. There is also provided an inkjet recording method that includes (a') a step of discharging the ink composition onto a recording medium and (b') a step of curing the ink composition by irradiating the discharged ink composition with actinic radiation. There are also provided a printed material obtained by the inkjet recording method, a process for producing a lithographic printing plate employing the ink composition, and a lithographic printing plate obtained by the production process.
BRIEF SUMMARY OF THE INVENTION
[0007] It is an object of the present invention, which has been accomplished under the above-mentioned circumstances, to provide an ink composition that cures with high sensitivity by exposure to actinic radiation, can form a high quality image, has excellent adhesion to a recording medium, has good storage stability, and can prolong the life of an ink head, and an inkjet recording method employing the ink composition.
[0008] It is another object of the present invention to provide a printed material and a lithographic printing plate obtained using an ink composition that has excellent storage stability and can be cured with high sensitivity by exposure to actinic radiation, and a process for producing a lithographic printing plate.
[0009] The above-mentioned objects can be accomplished by (1), (6), and (8) to (10) below. (2) to (5) and (7), which are preferred embodiments, are also shown below. [0010] (1) An ink composition comprising (a) an onium salt, a counteranion thereof having a volume of 1,000 .ANG..sup.3 or greater, and (b) a cationically polymerizable compound, [0011] (2) the ink composition according to (1) above, wherein the ink composition comprises a colorant, [0012] (3) the ink composition according to (2) above, wherein the colorant is a pigment or an oil-soluble dye, [0013] (4) the ink composition according to (3) above, wherein the oil-soluble dye has an oxidation potential of 1.0 V (vs SCE) or greater, [0014] (5) the ink composition according to any one of (1) to (4) above, wherein it is for inkjet recording, [0015] (6) an inkjet recording method comprising (a) a step of discharging an ink composition onto a recording medium, and (b) a step of curing the ink composition by irradiating the discharged ink composition with actinic radiation, wherein the ink composition is the ink composition according to any one of (1) to (5) above, [0016] (7) the inkjet recording method according to (6) above, wherein the actinic radiation is ultraviolet radiation emitted by a light emitting diode that has a light emission peak wavelength in the range of 350 to 420 nm and generates ultraviolet radiation whose maximum illumination intensity on the surface of a recording medium is 10 to 2,000 mW/cm.sup.2, [0017] (8) a printed material recorded by the inkjet recording method according to either (6) or (7), [0018] (9) a process for producing a lithographic printing plate, the process comprising (a) a step of discharging the ink composition according to any one of (1) to (5) above onto a hydrophilic support, and (b) a step of curing the ink composition by irradiating the discharged ink composition with actinic radiation so as to form a hydrophobic image on the hydrophilic support from the cured ink composition, and [0019] (10) a lithographic printing plate produced by the process for producing a lithographic printing plate according to (9) above.
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