Abstract: The present invention is an active light-curable inkjet ink which contains a gelling agent, an ultraviolet absorbent and a photopolymerizable compound. The molecular weight of the ultraviolet absorbent is from 300 to 1,000 (inclusive); and the content of the ultraviolet absorbent is from 5% by mass to 60% by mass (inclusive) relative to the total mass of the gelling agent. According to the present invention, weather resistance of an ink is able to be sufficiently enhanced even if the ink is an inkjet ink containing a gelling agent and an ultraviolet absorbent, while suppressing decrease in the pinning properties and decrease in the storage stability of the gelling temperature of the ink caused by the ultraviolet absorbent contained in the ink.

Abstract: A line-head-type inkjet image-forming method includes ejecting a gel ink to a recording medium at a first coverage rate that is less than 100% and set to allow dots of newly ejected gel ink to unite with dots of the gel ink already landed on the recording medium. The gel ink contains a specific amount of a polymer dispersant based on the amount of the colorant and has a specific contact angle on the recording medium. The gel ink is ejected from nozzles so as to form dots with a diameter slightly larger according to the resolution of the image to be formed.

Abstract: Provided is a method for inkjet image formation using a line head and an activating light beam-curing type ink, characterized in that the duration from the time, from a first ink lands on a recording medium, to the time that the first ink or a second ink of the same color series as the first color lands on the recording medium, is 25 ms or longer; the ink includes a gelling agent in an amount of 0.5-3.0 mass % to the entire mass of the ink; and the complex viscosity of the ink at the temperature at which the ink lands on the recording medium is 50-300 Pa·s. According to this method, even when an inkjet image is formed at high speed using ink that experiences a sol-gel phase transition, an image free from white spots and gloss differences in the overlap areas can be formed.

Abstract: A line-head-type inkjet image-forming method includes ejecting a gel ink to a recording medium at a first coverage rate that is less than 100% and set to allow dots of newly ejected gel ink to unite with dots of the gel ink already landed on the recording medium. The gel ink contains a specific amount of a polymer dispersant based on the amount of the colorant and has a specific contact angle on the recording medium. The gel ink is ejected from nozzles so as to form dots with a diameter slightly larger according to the resolution of the image to be formed.

Abstract: Provided is a method for inkjet image formation using a line head and an activating light beam-curing type ink, characterized in that the duration from the time, from a first ink lands on a recording medium, to the time that the first ink or a second ink of the same color series as the first color lands on the recording medium, is 25 ms or longer; the ink includes a gelling agent in an amount of 0.5-3.0 mass % to the entire mass of the ink; and the complex viscosity of the ink at the temperature at which the ink lands on the recording medium is 50-300 Pa·s. According to this method, even when an inkjet image is formed at high speed using ink that experiences a sol-gel phase transition, an image free from white spots and gloss differences in the overlap areas can be formed.

Abstract: Provided is an actinic radiation curable inkjet ink capable of high sensitivity and high glossy image; and an image forming method utilizing the same.

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 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 curable ink for jet-ink recording comprising a white pigment and a polymerizable compound, wherein the polymerizable compound is a compound selected from the group consisting of: (a) oxetane compounds; (b) pyrrole or substituted pyrroles; (c) aniline or substituted anilines; and (d) thiophene or an substituted thiophenes, provided that when the polymerizable compound is the oxetane compound, the curable ink further comprises an epoxy compound or a vinyl ether compound.

Abstract: A white ink composition for ink jet recording characterized in including at least a white pigment, a polymerizable compound, and a polymerization initiator and having a viscosity of 10 to 500 Pa·s at 30° C. A method for ink jet recording including the steps of: heating an ink in an ink-jet head to be not less than 40° C. and jetting the ink onto an ink-jet recording medium.

Abstract: An ink set for use in ink jet recording is disclosed, comprising one or more color inks and a white ink, wherein each of the color inks and the white ink contains a colorant and a surface tension of the white ink is lower than that of the color inks. An image forming method is also disclosed by using the ink set.

Abstract: A white ink composition for ink-jet recording including: a white pigment; a dispersing agent; a polymerizable compound; and a photo-polymerization initiator, wherein, when an ink-jet image is formed with the white ink composition and hardened by irradiation of an activation energy ray to have a thickness of 5 through 20 ?m, the hardened ink-jet image has a whiteness with lightness index of L*>90 and a chroma indexes of ?2<a*<+2 and ?5<b*<+5 in CIELAB color space, and a 60° mirror surface glossiness of no less than 80.

Abstract: A photocurable ink for ink-jet recording, comprising an oxetane compound having a substituent at the 2-position of the molecule.

Abstract: A white ink composition for ink jet recording characterized in comprising at least a white pigment, a polymerizable compound, and a polymerization initiator and having a viscosity of 10 to 500 Pa·s at 30° C. A method for ink jet recording comprising the steps of: heating an ink in an ink-jet head to be not less than 40° C. and jetting the ink onto an ink-jet recording medium.

Abstract: A photocurable ink for ink-jet recording, comprising an oxetane compound having a substituent at the 2-position of the molecule.

Abstract: A curable ink for jet-ink recording comprising a white pigment and a polymerizable compound, wherein the polymerizable compound is a compound selected from the group consisting of: (a) oxetane compounds; (b) pyrrole or substituted pyrroles; (c) aniline or substituted anilines; and (d) thiophene or an substituted thiophenes, provided that when the polymerizable compound is the oxetane compound, the curable ink further comprises an epoxy compound or a vinyl ether compound.

Abstract: A white ink composition for ink jet recording characterized in comprising at least a white pigment, a polymerizable compound, and a polymerization initiator and having a viscosity of 10 to 500 Pa·s at 30° C.