Abstract: An aqueous ink comprising at least one dye having at least one ionic hydrophilic group within a molecule thereof and represented by the following formula (1): wherein A and B each independently represents a substituted or unsubstituted monovalent aromatic group or a substituted or unsubstituted monovalent heterocyclic group, R1 represents a substituted or unsubstituted aromatic group excluding an unsubstituted phenyl group or a substituted or unsubstituted heterocyclic group, and R2 represents a substituent.

Abstract: An ink containing an azo dye having, in total, at least 13 conjugated ? electrons in an aromatic ring thereof that is not directly bonded to any azo group.

Abstract: The present invention provides an ink for inkjet recording capable of giving a color image having excellent fastness to ozone gas and provides an ink set for inkjet recording and an inkjet recording method, which can form an image having excellent color reproducibility and high light fastness, in which the ink for inkjet recording comprises an azo dye having a specific structure; an ink set for inkjet recording, comprising a yellow ink, a magenta ink and a cyan ink as minimum constituent elements, wherein these inks comprises the above-described azo dye; and an inkjet recording method using the ink for inkjet recording or the ink set for inkjet recording.

Abstract: An azo dye represented by formula (II) as defined in the specification, a process of producing the same and a coloring composition containing the azo dye.

Abstract: To provide an ink composition that when printed using a nozzle, does not cause clogging at the chip of the nozzle, is free from paper dependency, and when printed on an arbitrarily chosen paper, exhibits superior properties in water resistance, scratch resistance, lightfastness and ozone resistance and an inkjet recording method using it. The ink composition contains colored fine particles containing an oil-soluble polymer and an oil-soluble dye having an oxidation potential higher than 1.0 V (vs SCE), in an aqueous medium.

Abstract: The present invention provides a coloring composition which affords colored images and colored materials excellent in water resistance and fastness using a novel azo compound having an excellent water resistance and a sufficient fastness to light, heat, humidity, and active gases in the environment as a black dye, and an inkjet recording ink composition and an inkjet recording method capable of forming images excellent in the above characteristic properties. A coloring composition containing a dis-azo compound or poly-azo compound which contains two or more substituents having a pKa value in water of ?10 to 5 and which has an oxidation potential more positive than 0.8 V (vs SCE), and an inkjet recording ink composition containing the coloring composition and an inkjet recording method wherein an image is formed on an image-receiving material containing a support having provided thereon an ink receiving layer containing a white inorganic pigment particle, using the inkjet recording ink composition.

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 aqueous ink comprising at least two dyes each having at least one ionic hydrophilic group in a molecule thereof, wherein at least one of said at least two dyes includes an azo dye represented by formula (1): wherein A and B each independently represents a substituted or unsubstituted monovalent aromatic group; or a substituted or unsubstituted monovalent heterocyclic group; R1 represents a hydrogen atom; a substituted or unsubstituted aromatic group; or a substituted or unsubstituted heterocyclic group; and X represents —CR2? or a nitrogen atom, and when X represents —CR2?, R2 represents a hydrogen atom or a substituent.

Abstract: A colored composition for image formation which comprises an azo dye represented by formula (1); an ink for ink-jet recording and a method of ink-jet recording each comprising or using the composition; and a heat-sensitive recording material, color toner, and color filter each formed from the composition. In the formula, R1 represents a substituted or unsubstituted, aryl or heterocyclic group; R2 represents a hydrogen atom, a substituted or unsubstituted, alkyl, aryl, or heterocyclic group, etc.; and R3, R4, R5, and R6 each independently represents a hydrogen atom, a halogen atom, an alkyl group, an aromatic group, an alkylsulfonylamino group or an acylamino group, etc.

Abstract: To provide an aqueous ink, particularly, an inkjet recording ink, and an inkjet recording method, which can form an image having good color hue and excellent fastness to light and active gases in the environment, particularly, ozone gas, the aqueous ink has a polyazo dye containing at least two azo groups, an ionic hydrophilic group, and a sulfur-containing 5-membered heterocyclic group; and an inkjet recording ink and an inkjet recording method each using the aqueous ink.

Abstract: An azo dye comprising a coupler having a specific structure as a coupling component, an image-forming coloring composition comprising the azo dye, an ink for ink jet recording and an ink jet recording method using the image-forming coloring composition and a heat-sensitive recording material, a color toner and a color filter formed by the image-forming coloring composition.

Abstract: A coloring composition such as printing ink for inkjet printing or the like or electrophotographic color toner is provided, which can give a colored image or material excellent in the color hue and fastness, and also provide an inkjet recording method capable of forming an image having good color hue and high fastness to light and active gases in the environment, particularly ozone gas, and which is an inkjet ink comprising an azo dye having a specific structure containing an alkyl chain having 4 to more carbon atoms and not containing an ionic hydrophilic group; an inkjet recording method using the ink; and a color toner composition comprising the above-described azo dye.

Abstract: An aqueous ink comprising at least one dye having at least one ionic hydrophilic group within a molecule thereof and represented by the following formula (1): wherein A and B each independently represents a substituted or unsubstituted monovalent aromatic group or a substituted or unsubstituted monovalent heterocyclic group, R1 represents a substituted or unsubstituted aromatic group excluding an unsubstituted phenyl group or a substituted or unsubstituted heterocyclic group, and R2 represents a substituent.

Abstract: A curable composition and a negative type color filter including a compound represented by the following formula (1). A is a residue of a five-membered heterocyclic diazo component A—NH2. B1 and B2 are each —CR1?, —CR2? or N. R5 and R6 are each H, an aliphatic group, an aromatic group, a heterocyclic group or the like. G, R1 and R2 are each H, a halogen, an aliphatic group, an aromatic group, a heterocyclic group, a cyano group, a carboxyl group, a carbamoyl group, an alkoxycarbonyl group or the like. R1 and R5, or R5 and R6 may be bonded with each other to form a five-membered or six-membered ring.

Abstract: An ink composition comprising at least one of water-soluble dyes represented by the following formulae (1) to (3) and a surfactant:

Abstract: An ink composition for inkjet recording comprising: an azo dye having an aromatic nitrogen-containing 6-membered heterocycle as a coupling component; a compound represented by the following formula (I); and an aqueous medium wherein the azo dye is dissolved or dispersed in the aqueous medium:

Abstract: The invention provides a water-soluble ink capable of forming an image having good color hue and high fastness in various use and environmental conditions, which comprises a coloring composition comprising a disazo dye represented by the following formula 1: A1-N═N-A2-N═N-A3 and at least one other dye having a specific structure; in formula 1, A1, A2 and A3 each independently represents an aromatic group which may be substituted or a heterocyclic group which may be substituted, and A1 and A3 each is a monovalent group and A2 is a divalent group.

Abstract: An ink containing a dye and a basic polymer in an aqueous medium, in which the basic polymer has a side-chain containing a tertiary amino group, a quaternary ammonium group or a nitrogen atom-containing heterocyclic group is favorably employed in a method of forming an ink image on a receiving sheet using an ink jet printer.

Abstract: A compound represented by the following formula (I) or formula (2-I) 1

Abstract: A coloring composition for image formation comprising an azo dye having an aromatic nitrogen-containing 6-membered heterocyclic ring as a coupling component, a coloring composition which comprises an azo compound having an oxidation potential nobler than 1.0 V vs. SCE and comprising at least two substituents having a pKa value of −10 to 5 in water, and a method for improving ozone resistance of a color image, the method comprising using a compound having an oxidation potential nobler than 1.0 V vs. SCE and showing a maximum absorption at a wavelength between 500 nm and 580 nm with a half-value width of 150 nm or narrower.