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: The active ray-curable inkjet ink comprises a gelling agent, photopolymerizable compounds and a photoinitiator, and reversibly transitions into a sol-gel phase according to the temperature. Therein: (1) a (meth)acrylate compound having a molecular weight of 300-1,500 and having 3-14 (—CH2—CH2—O—) structural units within a molecule is included as the first photopolymerizable compound at a proportion of 30-70 mass % relative to the total mass of the ink; (2) a (meth)acrylate compound having a molecular weight of 300-1,500 and a C log P value of 4.0-7.0 is included as the second photopolymerizable compound at a proportion of 10-40 mass % relative to the total mass of the ink; and (3) the gelling agent has a total of at least 12 carbon atoms, and has a straight or branched alkyl chain including at least three carbon atoms.

Abstract: A printed matter production process including ejecting droplets of an actinic ray curable inkjet ink in a heated state through a head to supply the droplets onto a recording medium, thereby forming an image, the actinic ray curable inkjet ink including a polymerizable compound, a photopolymerization initiator and a gelling agent, having a viscosity of from 60 to 200 mPasecond at 25° C. and at a shear rate of 1000/second and showing a phase transition at a temperature of not lower than 25° C., characterized in that the actinic ray curable inkjet ink includes a bifunctional polymerizable compound with a molecular weight of not lower than 400 and with a viscosity at 25° C. of not more than 100 mPasecond in an amount of not less than 75 % by mass of the total amount of the polymerizable compound.

Abstract: The purpose of the present invention is to provide an actinic ray curable inkjet ink which, in an inkjet printing method, is capable of having both high pinning characteristics and high ejection characteristics. In order to achieve the above purpose, this actinic ray curable inkjet ink includes an actinic ray curable compound, ketone wax, and ester wax, and reversibly goes through a sol-gel phase transition depending on the temperature.

Abstract: The active ray-curable inkjet ink comprises a gelling agent, photopolymerizable compounds and a photoinitiator, and reversibly transitions into a sol-gel phase according to the temperature. Therein: (1) a (meth)acrylate compound having a molecular weight of 300-1,500 and having 3.44 (—CH2—CH2—O—) structural units within a molecule is included as the first photopolymerizable compound at a proportion of 30-70 mass % relative to the total mass of the ink; (2) a (meth)acrylate compound having a molecular weight of 300-1,500 and a C log P value of 4.0-7.0 is included as the second photopolymerizable compound at a proportion of 10-40 mass % relative to the total mass of the ink; and (3) the gelling agent has a total of at least 12 carbon atoms, and has a straight or branched alkyl chain including at least three carbon atoms.

Abstract: A active ray curable ink-jet ink includes a multifunctional acrylate or methacrylate of at least three functional groups, and the acrylate or the methacrylate has a partial structure of the following Formula (1) in an amount of 5-40 weight % based on the total weight of the active ray curable ink-jet ink: Formula (1) —(R—O—)n—, wherein R is an alkylene group, and n is an integer of at least three.

Abstract: Provided are an actinic energy radiation curable ink, which can achieve a high fineness and natural glossiness when recording is carried out onto a non-absorptive recording medium such as a film or a laminated paper or a slightly absorptive recording medium such as a coated paper; and an actinic energy radiation curable inkjet recording method. This actinic energy radiation curable ink, which is to be used in inkjet recording, is characterized by: said actinic energy radiation curable ink undergoing reversible sol/gel phase transition depending on temperature; said actinic energy radiation curable ink containing from 1% or more by mass to less than 10% by mass of a gelling agent; and, at temperature Tm (° C.) that is separately defined, the storage elastic modulus (G?) of the actinic energy radiation curable ink being from 0.1 or more Pa to less than 1000 Pa and the storage elastic modulus (G?) being smaller than the loss elastic modulus (G?) thereof.

Abstract: The method for forming an inkjet image provides a high-resolution image with a stable ink ejection and the image exhibits excellent curability, The image is formed using an inkjet recording head comprising a plurality of pressure chambers, a plurality of nozzles in communication with the pressure chambers and positioned on one side of the pressure chamber, and an ink chamber in communication with the pressure chamber and positioned on an opposite side of the pressure chamber. The ink composition in the ink chamber has a photo-initiator, a polymerizable compound and a gelling agent. The temperature of the ink composition in the ink chamber is kept at 70° C.-140° C. during an image recording and during standing-by. The ink composition is forced to flow in the ink chamber.

Abstract: Disclosed is a printed matter production process comprising ejecting droplets of an actinic ray curable inkjet ink in a heated state through a head to supply the droplets onto a recording medium, thereby forming an image, the actinic ray curable inkjet ink containing a polymerizable compound, a photopolymerization initiator and a gelling agent, having a viscosity of from 60 to 200 mPasecond at 25° C. and at a shear rate of 1000/second and showing a phase transition at a temperature of not lower than 25° C., characterized in that the actinic ray curable inkjet ink contains a bifunctional polymerizable compound with a molecular weight of not lower than 400 and with a viscosity at 25° C. of not more than 100 mPasecond in an amount of not less than 75% by mass of the total amount of the polymerizable compound. The process excels in ink ejection properties, enables high speed printing, and provides a printed matter having an image with high precision image quality, excellent stability and reduced deformation.

Abstract: A method for forming an image with an ink-jet recorder provided with an ink-jet head, the method including the following steps in the sequence set forth: ejecting a photo-acid generator solution through the ink-jet head on a recording material, provided that the photo-acid generator solution contains a solvent and a photo-acid generator without containing a photopolymerizable compound; irradiating the ejected photo-acid generator solution on the recording material with actinic radiation rays; ejecting an actinic radiation curable ink containing a colorant through the ink-jet head on the recording material to form an image; and irradiating the image with actinic radiation rays so as to fix the formed image.

Abstract: An active ray-curable ink comprising a pigment, a photoinitiator, a polymerizable compound, a compound represented by following Formula (1), and a urethane polymer or a urethane oligomer having no photopolymerizable group in a molecule: wherein at least either of R1 and R2 represents an alkoxy group having a carbon number of 4-10; and at least one of R3, R4, R5, and R6 represents an alkyl group, an alkylsulfonyl group, or an alkoxy group having a carbon number of 4-9, and has a secondary or tertiary carbon atom at a binding site to the anthracene ring.

Abstract: Provide is a method for forming an inkjet image in which a high-resolution image can be formed by a stable ink ejection and an inkjet image exhibits excellent curability, wherein the inkjet image is formed by ejecting an ink composition onto a medium from a nozzle of an inkjet recording head comprising a plurality of pressure chambers, a plurality of nozzles in communication with the pressure chambers and an ink chamber in communication with a side of a plurality of the pressure chamber on which side is opposite to a side of the nozzle of the pressure chamber, and the ink chamber is filled with the ink composition, wherein the ink composition comprises an photo-initiator, a polymerizable compound and a gelling agent; and comprising steps of heat-keeping a temperature of the ink composition in the ink chamber at 70° C.-140° C. during an image recording including during standing-by, and flowing the ink composition in the ink chamber.

Abstract: An active ray curable ink-jet ink comprising at least one type of a photo acid generating compound, a cationic polymerizable compound and a pigment, wherein the active ray curable ink-jet ink contains a fatty acid amine salt comprising a fatty acid having a carbon number of 6-18 and a primary, a secondary or a tertiary amine having a carbon number of 4-12 in an amount of 0.01-0.70 weight % based on the total weight of the ink-jet ink.

Abstract: An actinic radiation curable ink comprising: a photopolymerizable compound; and a urethane polymer, wherein a content of isocyanate groups remaining in the urethane polymer is 0.1% or less based on the total number of the isocyanate groups required to prepare urethane polymer in the actinic radiation curable ink.

Abstract: A method of producing an image including the steps of: (a) ejecting droplets of at least two actinic radiation curable ink-jet inks from an ink-jet recording head so as to deposit onto a recording medium; and (b) irradiating the deposited droplets of the actinic radiation curable ink-jet inks with actinic radiations, wherein the two actinic radiation curable ink-jet inks being different in hue with each other; and an absolute value of ?S(Slow?Shigh) is 5-1,000 mPa·s, where Slow represents a viscosity of the actinic radiation curable ink-jet ink measured with a share rate of 11.7 l/s at 25° C., Shigh represents a viscosity of the actinic radiation curable ink-jet ink measured with a share rate of 1,000 l/s at 25° C., and ?S(Slow?Shigh) represents a difference between the viscosities of Slow and Shigh.

Abstract: An active ray curable ink-jet ink set comprising an active ray curable yellow ink, an active ray curable cyan ink, an active ray curable black ink, and further one or more active ray curable color inks other than yellow, cyan and black, wherein each of the active ray curable inks contains a photo-polymerization initiator, a photo-polymerizable compound, a pigment, and a dispersing agent which has an amine value and an acid value, provided that the acid value is higher than the amine value, and an average particle diameter of the pigment contained in the yellow ink is larger than that of the pigment in the cyan ink and than that of the pigment in the black ink by 0.025-0.090 ?m, and further the average particle diameter of the pigment contained in each of the inks of the active ray curable ink-jet ink set is 0.070-0.220 ?m.

Abstract: An active ray curable ink-jet ink comprising at least an organic pigment, a polymer dispersant, a photo-initiator and a cationic polymerizable compound, wherein the active ray curable ink-jet ink incorporates a quaternary ammonium salt and a content of the quaternary ammonium salt is not less than 5 ppm and not more than 500 ppm.

Abstract: An actinic radiation curable ink-jet ink comprising: a metal complex pigment; a cationically polymerizable compound; a polymer dispersing agent having a basic functional group exhibiting an amine value of 5-40 mg/g; and a photo acid generating agent, wherein the cationically polymerizable compound comprises an oxirane ring. The aforesaid actinic radiation curable ink-jet ink enable to achieve an ink-jet ink exhibiting excellent storage stability, ejection capability, and curability after ejection, and enables formation of highly detailed images which realize high density, uniform glossiness, and excellent color reproduction, and forms no wrinkling, and provide a image forming method using the same.

Abstract: Provided is a method for forming an image with an ink-jet recorder provided with an ink-jet head, the method comprising the following steps in the sequence set forth: ejecting a photo-acid generator solution through the ink-jet head on a recording material, provided that the photo-acid generator solution contains a solvent and a photo-acid generator without containing a photopolymerizable compound; irradiating the ejected photo-acid generator solution on the recording material with actinic radiation rays; ejecting an actinic radiation curable ink containing a colorant through the ink-jet head on the recording material to form an image; and irradiating the image with actinic radiation rays so as to fix the formed image.