Abstract: The purpose of the present invention is to provide: an active ray-curable inkjet ink which has good dispersion stability during storage, good surface smoothness when ejected on a recording medium, and does not undergo the bleeding of a fatty acid onto the surface of the ink; and an image formation method using the active ray-curable inkjet ink. The purpose can be achieved by an active ray-curable inkjet ink which contains: a photopolymerizable compound; at least one wax in the total mass of 1 to 8 mass % relative to the whole mass of the ink; and a fatty acid in the total mass of 0.0001 to 0.10 mass % relative to the whole mass of the wax.

Abstract: An object of the invention is to provide an inkjet printer that forms an image with good quality. The object is achieved by an inkjet printer 1 including an ink head H ejecting an ink, an ink supply unit P communicating with the ink head H, and an ink storage unit T communicating with the ink supply unit P and supplying the ink to the ink head H through the ink supply unit P, in which at least a part of the ink supply unit P has an ink heating unit S that heats the ink until a viscosity of the ink is within the range of 5 mPa·s or more to 30 mPa·s or less, and the ink storage unit T has a shearing device that shears the ink.

Abstract: Provided is a photocurable inkjet ink including a curable monomer, a photopolymerization initiator, a gelling agent, a colorant, and a curable oligomer. The photocurable inkjet ink is characterized in that the curable oligomer has from two to twenty functional groups, that the glass transition temperature thereof is 40.degree. C. or higher, and that the curable oligomer content is from 2 to 20% by mass relative to the mass of the ink as a whole.

Abstract: Provided is an actinic radiation-curable inkjet ink that undergoes sol-gel phase transfer and contains a dye, a gelling agent, a photopolymerization compound and a photopolymerization initiator. The actinic radiation-curable inkjet ink includes a photopolymerizable compound A, which is a (meth)acrylate having hydroxyl groups; a photopolymerizable compound B, which is a (meth)acrylate compound having a molecular weight within a range of 300 to 1,500 and an intramolecular structure (—CH2—CH2—O—)m (where m is an integer between 3 and 14); and a (meth)acrylate compound C, which has a molecular weight within a range of 280 to 1,500 and a C log P value within a range of 4 to 7. The ink contains, in terms of the mass of the entire ink, 1 to 15 mass % of photopolymerizable compound A, 30 to 70 mass % of photopolymerizable compound B, 10 to 40 mass % of photopolymerizable compound C, and 2 to 10 mass % of gelling agent.

Abstract: An object of the invention is to provide an inkjet printer that forms an image with good quality. The object is achieved by an inkjet printer 1 including an ink head H ejecting an ink, an ink supply unit P communicating with the ink head H, and an ink storage unit T communicating with the ink supply unit P and supplying the ink to the ink head H through the ink supply unit P, in which at least a part of the ink supply unit P has an ink heating unit S that heats the ink until a viscosity of the ink is within the range of 5 mPa·s or more to 30 mPa·s or less, and the ink storage unit T has a shearing device that shears the ink.

Abstract: The purpose of the present invention is to provide: an active ray-curable inkjet ink which has good dispersion stability during storage, good surface smoothness when ejected on a recording medium, and does not undergo the bleeding of a fatty acid onto the surface of the ink; and an image formation method using the active ray-curable inkjet ink. The purpose can be achieved by an active ray-curable inkjet ink which contains: a photopolymerizable compound; at least one wax in the total mass of 1 to 8 mass % relative to the whole mass of the ink; and a fatty acid in the total mass of 0.0001 to 0.10 mass % relative to the whole mass of the wax.

Abstract: Provided is an actinic radiation-curable inkjet ink that undergoes sol-gel phase transfer and contains a dye, a gelling agent, a photopolymerization compound and a photopolymerization initiator. The actinic radiation-curable inkjet ink comprises a photopolymerizable compound A, which is a (meth)acrylate having hydroxyl groups; a photopolymerizable compound B, which is a (meth)acrylate compound having a molecular weight within a range of 300 to 1,500 and an intramolecular structure (—CH2—CH2—O—)m (where m is an integer between 3 and 14); and a (meth)acrylate compound C, which has a molecular weight within a range of 280 to 1,500 and a ClogP value within a range of 4 to 7. The ink contains, in terms of the mass of the entire ink, 1 to 15 mass % of photopolymerizable compound A, 30 to 70 mass % of photopolymerizable compound B, 10 to 40 mass % of photopolymerizable compound C, and 2 to 10 mass % of gelling agent.

Abstract: Provided is a photocurable inkjet ink comprising a curable monomer, a photopolymerization initiator, a gelling agent, a colorant, and a curable oligomer. The photocurable inkjet ink is characterized in that the curable oligomer has from two to twenty functional groups, that the glass transition temperature thereof is 40° C. or higher, and that the curable oligomer content is from 2 to 20% by mass relative to the mass of the ink as a whole.

Abstract: Disclosed is an ink-jet printer ejecting an ink comprising a cationic-polymerizable compound onto a recording medium, wherein the ink-jet printer comprises ink-contact members which constitute an ink tank retaining the ink and an ink jet supply passage of from the ink tank to a recording head ejecting the ink and the ink-contact members are each comprised of a material which does substantially not undergo electron transfer with the ink.

Abstract: Disclosed is an active energy ray-curable ink composition containing at least a cationically polymerizable compound which is curable with an active energy ray and a pigment. This active energy ray-curable ink composition is characterized in that a vinyl ether compound is contained as the cationically polymerizable compound, the vinyl ether compound content relative to the total of the cationically polymerizable compound is not less than 45% by mass, and the pigment is composed of C.I. Pigment Red 122. This active energy ray-curable ink composition is excellent in storage stability while containing a cationically polymerizable compound which can be cured with an active energy ray. Also disclosed are a storage container for such an active energy ray-curable ink composition and a method for storing such an active energy ray-curable ink composition.

Abstract: An actinic ray curable composition containing a phthalocyanine pigment or a carbon black pigment; a dispersant; a cationically polymerizable monomer; a photo acid generator; and a phthalocyanine derivative.

Abstract: In an image recording apparatus equipped with plural printing heads each for jetting ink drops having a photo-setting property towards a recording medium, a conveyance unit for conveying the recording medium to the printing heads, and each of plural light radiation devices for radiating light to the ink drops landed on the recording medium to harden, is arranged at the downstream side of each of the plural printing heads, one having largest light energy, which is located at the most downstream position among the plural light radiation devices is determined at least to satisfy the light energy necessary for hardening of the ink drops jetted by any one of the printing heads positioned upstream thereof, and the light energy becomes smaller gradually for every light radiation device in the order from the light radiation device at the most downstream position to those at more upstream positions.

Abstract: An image recording device, comprises: a recording head which discharges an ultraviolet-ray curable ink, which is cured as irradiated with ultraviolet rays; an ultraviolet light source which generates ultraviolet rays to cure the ultraviolet-ray curable ink; a first heating section which heats the ultraviolet-ray curable ink on a recording medium after an irradiation of the ultraviolet rays; a pressure section which pressurizes the recording medium after an irradiation of the ultraviolet rays; and a controller which controls the first heating section to start heating the ultraviolet-ray curable ink on the recording medium after the last discharge of the ink to an arbitrary area on the recording medium, a first predetermined time between the last discharge and the starting heat is predetermined, and controls the first heating section to heat the ultraviolet-ray curable ink within a second predetermined time.

Abstract: An image printing apparatus including a conveyance-printing section for printing on a recording medium sheet; a first printing device including a plurality of black printing heads for jetting image-setting black ink drops onto the recording medium sheet; a second printing device including a plurality of color printing heads for jetting image-setting color ink drops onto the recording medium sheet; first light radiating devices which radiate ultraviolet rays to harden the image-setting black ink drops; and second light radiating devices which radiate the ultraviolet rays to harden the image-setting color ink drops.

Abstract: The present invention provides an active ray curable ink-jet ink which exhibits excellent ejection capability, results in no mixing of deposited dots between colors during high speed printing, and exhibits rapid curing characteristics, and an image forming method and an image forming apparatus employing the above ink-jet ink. The above active ray curable ink-jet ink is characterized of incorporating at least a carbon black based pigment, a dispersing agent, a cationic polymerizable monomer, and an acid generating agent, wherein the aforesaid carbon black based pigment is basic and the aforesaid dispersing agent has an acid value and an amine value.

Abstract: An actinic radiation curable ink-jet ink exhibiting excellent storage stability and curability, characterized by incorporating a benzimidazolone based pigment, a dispersing agent, a cationically polymerizable monomer which is an oxetane compound, a photolytically acid generating agent, and a benzimidazolone derivative.

Abstract: Disclosed is an ink-jet printer ejecting an ink comprising a cationic-polymerizable compound onto a recording medium, wherein the ink-jet printer comprises ink-contact members which constitute an ink tank retaining the ink and an ink jet supply passage of from the ink tank to a recording head ejecting the ink and the ink-contact members are each comprised of a material which does substantially not undergo electron transfer with the ink.

Abstract: A photocurable ink for ink-jet printing, including: a photopolymerizable compound; a pigment; and a dispersing agent, wherein the photopolymerizable compound is a radical polymerizable compound; an amine value of the pigment (AMp) is larger than an acid value of the pigment (ACp); and an acid value of the dispersing agent (ACd) is larger than an amine value of the dispersing agent (AMd).

Abstract: An active ray curable ink-jet ink composition comprising: (i) a colorant; and (ii) a set of (I) or a set of (II), wherein the set of (I) contains: (a) a photopolymerizable alicyclic epoxy compound; and (b) a diol compound contained in a specific amount; and the set of (II) contains: (a) a photopolymerizable oxetane compound; (b) a photopolymerizable epoxy compound; and (c) a diol compound contained in a specific amount.

Abstract: An actinic radiation curable type inkjet ink is characterized in that the actinic radiation curable type inject ink contains an onium salt as a photolytically acid generating compound that does not produce benzene when exposed to actinic radiation, and a compound including an oxetane ring as a photo-polymerizable compound, wherein a water content by Karl Fischer method is 1.50 through 5.00 percent by mass.