Abstract: The present invention provides a method for forming an ink jet image, the method comprising forming an image by using an apparatus to form an image on an image-receiving material by an ink jet system with an ink for ink jet recording containing at least a water-soluble dye, water and a water-soluble organic solvent and, after image formation, discharge and stack a plurality of the image-receiving materials respectively having images formed thereon, wherein the water-soluble organic solvent is selected from a water-soluble diol and/or a pyrrolidone derivative each having an I/O value of 3.0 or more, and is contained in an amount of 40% by mass or more of the entire amount of water-soluble organic solvents in the ink for ink jet recording.

Abstract: The present invention provides a method of forming an inkjet image, the method comprising: providing an inkjet recording ink comprising a colorless water-soluble planar compound having ten or more delocalized pi-electrons in one molecule; impacting a first droplet of the inkjet recording ink on a surface of an image receiving material; impacting a second droplet of the inkjet recording ink, within 50 milliseconds after the first droplet on the recording ink impacts on the surface of the image receiving material, on a surface of the image receiving material at a location where the second and the first droplet contact each other.

Abstract: An ink set comprising a yellow ink containing at least one yellow dye, a magenta ink containing at least one magenta dye, a cyan ink containing at least one cyan dye and a black ink containing at least two kinds of dyes as a minimum constituent element, in which an oxidation potential for each of the yellow dye, the magenta dye and the cyan dye is more electropositive than 0.8 V (vs SCE) and/or each of the inks is an azo dye containing at least one heterocyclic ring in a molecule or a phthalocyanine dye containing at least one heterocyclic ring in a molecule, and the black ink contains a water soluble long wavelength dye L and a water soluble short wavelength dye S having three or more azo groups in one molecule and having a naphthalene skeleton, and a ink jet recording method utilizing the ink set.

Abstract: A black ink composition comprises a water soluble dye containing a single compound showing an absorption maximum at 440 to 540 nm with a half-value width of 90 nm to 200 nm for a visible region absorption spectrum in water.

Abstract: To provide an inkjet black ink having excellent image durability and ink discharge properties and an ink set, the inkjet black ink, which contains a dye having a ?max of from 500 nm to 700 nm and a half-band width of 100 nm or more in an absorption spectrum of a diluted solution standardized at an absorbance of 1.0 at the ?max, has the change ratio of absorbance at the ?max in the visible region, specified in the specification; and the inkjet ink set containing at least two black inks having different densities has the relationship among the at least two black inks, specified in the specification.

Abstract: An ink-jet ink used to form a functional film by ejecting an ink droplet using an ink-jet system onto a non-penetrative substrate includes a compound that has an amino group and an alkylene glycol portion within a molecule and serves as a wettability enhancer. Also provided are a method of producing the ink-jet ink, a method of producing a color filter using the ink-jet ink, and a method of forming a color filter or a functional film.

Abstract: To provide an ink stock solution excellent in handleability, a method for producing the same, an ink composition using the ink stock solution, particularly suitable for an ink for inkjet recording, and a method for producing the same, the ink stock solution includes a dye and a viscosity reducing agent, wherein the ink stock solution has a solid concentration of the dye of 7% or more by weight; the method for producing the ink stock solution includes adding a dye to a water and dissolving the dye in the water, and then, adding a viscosity reducing agent to control the viscosity; the method for producing the ink stock solution includes dissolving a dye, a water and a viscosity reducing agent all together; and the ink composition includes the ink stock solution and has a viscosity of 1 to 30 mPa·s.

Abstract: An inkjet recording ink includes at least one yellow-azo dye having specific properties or a specific structure dissolved and/or dispersed in an aqueous medium and containing a water-miscible organic solvent having a specific solubility with respect to dye.

Abstract: An ink set comprising a yellow ink containing at least one yellow dye, a magenta ink containing at least one magenta dye, a cyan ink containing at least one cyan dye and a black ink containing at least two kinds of dyes as a minimum constituent element, in which an oxidation potential for each of the yellow dye, the magenta dye and the cyan dye is more electropositive than 0.8 V (vs SCE) and/or each of the inks is an azo dye containing at least one heterocyclic ring in a molecule or a phthalocyanine dye containing at least one heterocyclic ring in a molecule, and the black ink contains a water soluble long wavelength dye L and a water soluble short wavelength dye S having three or more azo groups in one molecule and having a naphthalene skeleton, and a ink jet recording method utilizing the ink set.

Abstract: The ink set of the present invention provides a high ejection stability, gives an image having an excellent hue, light-resistance and waterproofness and improves the image preservability under severe conditions in ink jet recording, in which the ink set comprising a plurality of inks different in hues, wherein the plurality of inks includes a yellow ink containing a coloring agent that is a dye having: a ?max of from 390 nm to 470 nm; an I(?max+70 nm)/I(?max) ratio of not greater than 0.4, in which I(?max) is the absorbance at ?max and I(?max+70 nm) is the absorbance at (?max+70 nm); and a forced fading rate constant of not greater than 5.0×10?2 [hour?1], an ink cartridge having the ink set received therein, an ink jet printer comprising the ink cartridge mounted therein and an image recording method.

Abstract: The object of the present invention is to provide an inkjet recording ink ensuring excellent ejection stability even after aging of the ink and also exhibiting excellent weather resistance; provide an inkjet recording ink ensuring less blurring of the image drawn, in addition to excellent ejection stability and weather resistance; and provide a yellow ink and a dark yellow ink, which can contribute to realization of a pictorial quality with excellent color balance as a constituent ink of an ink set. These objects of the present invention can be achieved by an inkjet recording ink including an aqueous medium containing a yellow dye, particularly, a yellow dye represented by formula (1), having spectral absorption characteristics such that the maximum absorption wavelength is in the region from 390 to 470 nm and the absorption long-wave end has a tailing of a specified value or less, and antioxidative characteristics such that the ozone enforced discoloration rate constant is 5.0 x 10?2 [hour?1] or less.

Abstract: To provide inks and ink sets for inkjet recording, which have good fastness and good jet-out stability and which give good images with no bleeding trouble, yellow ink, black ink and magenta ink for inkjet printing contain at least two dyes each having an oxidation potential over 1.0 V (vs SCE).

Abstract: An ink obtained by dissolving at least one specific dye in an aqueous medium, wherein the dyes contained in the ink all have a solubility of 15 g or more in 100 g of water at 25° C. under atmospheric pressure; and an ink set formed from the ink. The dye is preferably a dye having an oxidation potential of 1.0 V (vs SCE) or more, more preferably a specific azo dye having a heterocyclic group of a specific structure or an aromatic group which is bound directly to an azo group, or a specific phthalocyanine dye having a water-soluble group as a substitunet. According to the present invention, an ink, specifically an inkjet ink, and an ink set, which can print an image without disorder or beading due to ejection failure and ensure excellent ejection stability and durability, is provided.

Abstract: As an ink for ink jet, containing at least a water-soluble dye having an anionic dissociable group, water and a water-soluble organic solvent, an ink including a cationic polymer capable of forming an ion pair with the anionic dissociable group is used. The cationic polymer is a water-soluble polymer, and at least one of cations is preferably derived from a nitrogen atom, and it is preferable to mix the cationic polymer and the water-soluble dye having the anionic desociable group in advance in water and to prepare an ink after eliminating the resulting salt.

Abstract: A black ink composition comprises a water soluble dye containing a single compound showing an absorption maximum at 440 to 540 nm with a half-value width of 90 nm to 200 nm for a visible region absorption spectrum in water.

Abstract: To provide an inkjet black ink having excellent image durability and ink discharge properties and an ink set, the inkjet black ink, which contains a dye having a ?max of from 500 nm to 700 nm and a half-band width of 100 nm or more in an absorption spectrum of a diluted solution standardized at an absorbance of 1.0 at the ?max, has the change ratio of absorbance at the ?max in the visible region, specified in the specification; and the inkjet ink set containing at least two black inks having different densities has the relationship among the at least two black inks, specified in the specification.

Abstract: An inkjet ink comprising at least one dye having a heterocyclic ring and a metal ion in an aqueous medium, wherein the ink jet ink further comprises a compound capable of accelerating aggregation of the dye in the aqueous medium.

Abstract: An inkjet color ink comprising: an aqueous medium; at least one yellow dye having a ?max of from 390 nm to 470 nm and an [I(?max+70 nm)/I(?max)] ratio of an absorbance I(?max+70 nm) at ?max+70 nm to an absorbance I(?max) at ?max of not more than 0.4; and at least one dye having a ?max of longer than 470 nm and not longer than 750 nm, the at least one yellow dye and the at least one dye being at least dissolved or dispersed in the aqueous medium, wherein both of the rate constants defined herein are not more than 5.0×10?2 hour?1.

Abstract: The ink set of the present invention provides a high ejection stability, gives an image having an excellent hue, light-resistance and waterproofness and improves the image preservability under severe conditions in ink jet recording, in which the ink set comprising a plurality of inks different in hues, wherein the plurality of inks includes a yellow ink containing a coloring agent that is a dye having: a ?max of from 390 nm to 470 nm; an I(?max+70 nm)/I(?max) ratio of not greater than 0.4, in which I(?max) is the absorbance at ?max and I(?max+70 nm) is the absorbance at (?max+70 nm); and a forced fading rate constant of not greater than 5.0×10?2 [hour?1], an ink cartridge having the ink set received therein, an ink jet printer comprising the ink cartridge mounted therein and an image recording method.

Abstract: The ink set of the present invention provides a high ejection stability, gives an image having an excellent hue, light-resistance and waterproofness and improves the image preservability under severe conditions in ink jet recording, in which the ink set comprising a plurality of inks different in hues, wherein the plurality of inks includes a yellow ink containing a coloring agent that is a dye having: a ?max of from 390 nm to 470 nm; an I(?max+70 nm)/I(?max) ratio of not greater than 0.4, in which I(?max) is the absorbance at ?max and I(?max+70 nm) is the absorbance at (?max+70 nm); and a forced fading rate constant of not greater than 5.0×10?2 [hour?1], an ink cartridge having the ink set received therein, an ink jet printer comprising the ink cartridge mounted therein and an image recording method.