Abstract: An aqueous ink composition containing, at least, water, a pigment (but excluding titanium oxides in which the pigment surface has been treated with an organic compound), a pigment dispersing resin, and two or more types of alkyl polyols having boiling points of at least 180° C. but not more than 250° C. at 1 atmosphere, wherein the pigment dispersing resin has an alkyl group of 10 to 36 carbon atoms, and the total amount of the alkyl polyols, relative to the total weight of the aqueous ink composition, is at least 10% by weight but not more than 30% by weight.

Abstract: Provided is an inkjet pigment ink which contains a pigment that is selected from the group consisting of C.L. Pigment Yellow 74 having a transmittance of 70% or more, C.I. Pigment Red 269 having a transmittance of 70% or more, C.I. Pigment Red 122 having a transmittance of less than 70% and C.I. Pigment Yellow 150; a water-soluble solvent that is selected from the group consisting of glycol ethers and diols; water; and a pigment dispersing resin that is a copolymer which contains a monomer A, a monomer B and a monomer C as unit components. The monomer A is an alkyl (meth)acrylate ester; the monomer B is styrene, ?-methyl styrene or benzyl (meth)acrylate; and the monomer C is (meth)acrylic acid.

Abstract: An aqueous inkjet ink composition comprising a pigment, a pigment-dispersing resin, resin fine particles (A), water, and hydrophilic solvents (B), the resin fine particles (A) being formed by emulsion polymerizing ethylenically unsaturated monomers including: 20% to 80% by weight of an aromatic ethylenically unsaturated monomer (C) that does not have an ionic functional group; 0.6% to 6% by weight of water-soluble ethylenically unsaturated monomers (F) consisting of 0.5% to 3% by weight of a sulfonic acid group-containing ethylenically unsaturated monomer (D) and 0.1% to 3% by weight of a nonionic water-soluble ethylenically unsaturated monomer (E); and 0.1% to 10% by weight of a crosslinkable ethylenically unsaturated monomer (G), and the hydrophilic solvents (B) including a glycol-based solvent (H) and an ethylene glycol ether-based solvent (I) is provided.

Abstract: The present invention relates to a pigment ink composition that can fulfill excellent print stability, and performances and drying performance of printed matters. The ink composition comprises: at least a pigment; an organic solvent; and two or more kinds of binder resins having different weight average molecular weights (Mw), wherein, when a binder resin having lowest weight average molecular weight (Mw) is marked as ?, and a binder resin having higher weight average molecular weight (Mw) than that of the binder resin ? and meeting formula (3) is marked as ? among the two or more kinds of binder resins to be used, the ink composition meets formulae (1) and (2): Formula (1): Mw??Mw??10,000, Formula (2): 1,000<Mw?<30,000, and Formula (3): 20,000<Mw?<100,000, wherein Mw? represents the weight average molecular weight of the binder resin ?, and Mw? represents the weight average molecular weight of the binder resin ?.

Abstract: Provided is an inkjet pigment ink which contains a pigment that is selected from the group consisting of C.L. Pigment Yellow 74 having a transmittance of 70% or more, C.I. Pigment Red 269 having a transmittance of 70% or more, C.I. Pigment Red 122 having a transmittance of less than 70% and C.I. Pigment Yellow 150; a water-soluble solvent that is selected from the group consisting of glycol ethers and diols; water; and a pigment dispersing resin that is a copolymer which contains a monomer A, a monomer B and a monomer C as unit components. The monomer A is an alkyl (meth)acrylate ester; the monomer B is styrene, ?-methyl styrene or benzyl (meth)acrylate; and the monomer C is (meth)acrylic acid.

Abstract: A non-aqueous ink jet which has less bad odor, has excellent safety and sanitariness, excellent resin dissolvability, excellent printing stability and excellent dryability, causes no corrosion of printers, and has good adhesiveness to non-absorbent substrates, and an ink set are provided. In the non-aqueous inkjet ink comprising a pigment, a resin and a mixed solvent, the mixed solvent comprises diethylene glycol dialkyl ether and tetraethylene glycol dialkyl ether.

Abstract: An aqueous inkjet ink composition comprising a pigment, a pigment-dispersing resin, resin fine particles (A), water, and hydrophilic solvents (B), the resin fine particles (A) being formed by emulsion polymerizing ethylenically unsaturated monomers including: 20% to 80% by weight of an aromatic ethylenically unsaturated monomer (C) that does not have an ionic functional group; 0.6% to 6% by weight of water-soluble ethylenically unsaturated monomers (F) consisting of 0.5% to 3% by weight of a sulfonic acid group-containing ethylenically unsaturated monomer (D) and 0.1% to 3% by weight of a nonionic water-soluble ethylenically unsaturated monomer (E); and 0.1% to 10% by weight of a crosslinkable ethylenically unsaturated monomer (G), and the hydrophilic solvents (B) including a glycol-based solvent (H) and an ethylene glycol ether-based solvent (I) is provided.

Abstract: A dispersing agent characterized in that said dispersing agent is prepared by reacting primary and/or secondary amino groups of an amine compound comprising a polyamine (C) with isocyanate groups of a urethane prepolymer (E) having two isocyanate groups in one terminal region, wherein said urethane prepolymer (E) has been prepared by reacting hydroxyl groups in a vinyl polymer (A) having two hydroxyl groups in one terminal region with isocyanate groups in diisocyanates (B), and in that an amine number of said dispersing agent is 1 to 100 mgKOH/g is disclosed. The dispersing agent of the present invention has excellent dispersibility, flowability, and storage stability when used in small quantities. A pigment-dispersed product can be prepared therefrom, independently of the kinds of binder resin or solvent used. Further, the present invention is suitable for offset ink, gravure ink, resist ink for a color filter, inkjet ink, coating composition, and colored resin composition.

Abstract: The present invention relates to a pigment ink composition that can fulfill excellent print stability, and performances and drying performance of printed matters. The ink composition comprises: at least a pigment; an organic solvent; and two or more kinds of binder resins having different weight average molecular weights (Mw), wherein, when a binder resin having lowest weight average molecular weight (Mw) is marked as ?, and a binder resin having higher weight average molecular weight (Mw) than that of the binder resin ? and meeting formula (3) is marked as ? among the two or more kinds of binder resins to be used, the ink composition meets formulae (1) and (2): Formula (1): Mw??Mw??10,000, Formula (2): 1,000<Mw?<30,000, and Formula (3): 20,000<Mw?<100,000, wherein Mw? represents the weight average molecular weight of the binder resin ?, and Mw? represents the weight average molecular weight of the binder resin ?.

Abstract: A dispersing agent characterized in that said dispersing agent is prepared by reacting primary and/or secondary amino groups of an amine compound comprising a polyamine (C) with isocyanate groups of a urethane prepolymer (E) having two isocyanate groups in one terminal region, wherein said urethane prepolymer (E) has been prepared by reacting hydroxyl groups in a vinyl polymer (A) having two hydroxyl groups in one terminal region with isocyanate groups in diisocyanates (B), and in that an amine number of said dispersing agent is 1 to 100 mgKOH/g is disclosed. The dispersing agent of the present invention has excellent dispersibility, flowability, and storage stability when used in small quantities. A pigment-dispersed product can be prepared therefrom, independently of the kinds of binder resin or solvent used. Further, the present invention is suitable for offset ink, gravure ink, resist ink for a color filter, inkjet ink, coating composition, and colored resin composition.

Abstract: A non-aqueous ink jet which has less bad odor, has excellent safety and sanitariness, excellent resin dissolvability, excellent printing stability and excellent dryability, causes no corrosion of printers, and has good adhesiveness to non-absorbent substrates, and an ink set are provided. In the non-aqueous inkjet ink comprising a pigment, a resin and a mixed solvent, the mixed solvent comprises diethylene glycol dialkyl ether and tetraethylene glycol dialkyl ether.