Abstract: Ink includes water, a pigment, an organic solvent including glycol ether, and a surfactant including a silicone-based surfactant and a salt of sulfo succinic acid dialkyl ester. As measured by maximum bubble pressure technique at 23 degrees C., the dynamic surface tension of the ink at 15 msec is not greater than 31 mN/m and the difference between the dynamic surface tension of the ink at 15 msec and the dynamic surface tension of the ink at 1,500 msec is not greater than 4.0 mN/m.

Abstract: Ink includes water, a pigment, an organic solvent including glycol ether, and a surfactant including a silicone-based surfactant and a salt of sulfo succinic acid dialkyl ester. As measured by maximum bubble pressure technique at 23 degrees C., the dynamic surface tension of the ink at 15 msec is not greater than 31 mN/m and the difference between the dynamic surface tension of the ink at 15 msec and the dynamic surface tension of the ink at 1,500 msec is not greater than 4.0 mN/m.

Abstract: To provide an inkjet recording ink set, which contains a cyan ink, magenta ink, yellow ink, and black ink, wherein each ink contains at least a pigment, a surfactant, water, water-soluble organic solvent, and anionic self-emulsifying ether-based polyurethane, wherein each ink contains, as the pigment, a combination of a (i) pigment dispersion liquid, in which the pigment is dispersed in water with assistance of the surfactant, and a (ii) resinous polymer-coated pigment dispersion liquid, in which the pigment is coated with a resinous polymer and dispersed in water, and wherein the (i) pigment dispersion liquid and the (ii) resinous polymer-coated pigment dispersion liquid satisfy the following formula: |A?B|?30 nm where A is the average particle diameter (D50) of the dispersed pigment in the (i) pigment dispersion liquid, and B is the average particle diameter (D50) of the dispersed resinous polymer-coated pigment in the (ii) pigment dispersion liquid.

Abstract: An inkjet recording ink set, which contains at least: a black pigment ink; and a color pigment ink, wherein the black pigment ink contains a black pigment treated with an anionic surfactant, and a black pigment coated with a resinous polymer, and water, and the black pigment ink is a pigment dispersion liquid where the black pigment treated with the anionic surfactant and the black pigment coated with the resinous polymer are dispersed in the water, and wherein the color pigment ink contains a color pigment, a nonionic surfactant, and water, and the color pigment ink is a pigment dispersion liquid where the color pigment is dispersed in the water with assistance of the nonionic surfactant.

Abstract: An inkjet recording ink, which contains: carbon black; a surfactant; water; a water-soluble organic solvent; and particles formed of an anionic self-emulsifying poly(ether urethane) resin, wherein the carbon black contains first carbon black whose surface has been treated with an anionic surfactant and second carbon black which has been coated with a resinous polymer, where a mass ratio of the first carbon black to the second carbon black is 10/90 to 90/10, and wherein the anionic surfactant is a naphthalenesulfonic acid-formaldehyde condensate.

Abstract: An inkjet recording ink including a pigment dispersion liquid containing at least a first carbon black and a dispersant, a second carbon black, a penetrant, a wetting agent and water, wherein the first carbon black has an average particle diameter D50 of 70 nm to 180 nm as measured by a dynamic light scattering method and has a particle diameter standard deviation equal to or smaller than ½ of the average particle diameter, wherein the dispersant is a condensate of naphthalene sulfonic acid and formalin, wherein the second carbon black is carbon black coated with a resin, and wherein the penetrant is a 2-ethyl-1,3-hexandiol.

Abstract: An inkjet ink set containing a first pigment ink and a second pigment ink. The first pigment ink includes an anionic self-emulsification ether polyurethane, and the second pigment ink includes a styrene acrylic resin emulsion.

Abstract: An inkjet recording ink, including: a pigment; a water-soluble organic solvent; a surfactant; a polyether-modified silicone oil; a dispersing agent represented by the following General Formula (1) or (2); and water, wherein the water-soluble organic solvent contains: glycerin as a first water-soluble organic solvent; and a second water-soluble organic solvent, wherein the second water-soluble organic solvent is dipropylene glycol, 1,3-butanediol, 3-methyl-1,3-butanediol, 1,5-pentanediol, 1,6-hexanadiol, or any combination thereof, and wherein a mass ratio of the first water-soluble organic solvent:the second water-soluble organic solvent is 1:0.75 to 1:2.25, where R1 represents a C1-C20 alkyl group, an allyl group or an aralkyl group, L is an integer of 0 to 7, and n is an integer of 20 to 200, where m is an integer of 1 or greater.

Abstract: To provide an inkjet recording ink set, which contains a cyan ink, magenta ink, yellow ink, and black ink, wherein each ink contains at least a pigment, a surfactant, water, water-soluble organic solvent, and anionic self-emulsifying ether-based polyurethane, wherein each ink contains, as the pigment, a combination of a (i) pigment dispersion liquid, in which the pigment is dispersed in water with assistance of the surfactant, and a (ii) resinous polymer-coated pigment dispersion liquid, in which the pigment is coated with a resinous polymer and dispersed in water, and wherein the (i) pigment dispersion liquid and the (ii) resinous polymer-coated pigment dispersion liquid satisfy the following formula: |A?B|?30 nm where A is the average particle diameter (D50) of the dispersed pigment in the (i) pigment dispersion liquid, and B is the average particle diameter (D50) of the dispersed resinous polymer-coated pigment in the (ii) pigment dispersion liquid.

Abstract: The inkjet ink includes at least a carbon black, a surfactant, a polyether-modified silicone oil having a polyoxyalkylene group in a side chain thereof, an anionic self-emulsifying polyether-modified polyurethane resin having a polyoxyalkylene group in a main chain thereof, and water. The inkjet ink contains particles having a particle diameter of not less than 0.5 ?m in an amount of from 500,000 to 2,000,000 pieces per 5.0 ?l, and has a volume average particle diameter (D50) of from 80 nm to 120 nm and a 90% cumulative particle diameter (D90) of from 160 nm to 200 nm.

Abstract: The present invention provides an inkjet pigment dispersion liquid including a carbon black, a dispersant, and water, wherein the total number of coarse particles having a particle diameter of 0.5 ?m or greater contained in the inkjet pigment dispersion liquid is 1,000,000/5 ?L or less, and provides an inkjet ink using the inkjet pigment dispersion liquid.

Abstract: The inkjet ink includes at least a carbon black, a surfactant, a polyether-modified silicone oil having a polyoxyalkylene group in a side chain thereof, an anionic self-emulsifying polyether-modified polyurethane resin having a polyoxyalkylene group in a main chain thereof, and water. The inkjet ink contains particles having a particle diameter of not less than 0.5 ?m in an amount of from 500,000 to 2,000,000 pieces per 5.0 ?l, and has a volume average particle diameter (D50) of from 80 nm to 120 nm and a 90% cumulative particle diameter (D90) of from 160 nm to 200 nm.

Abstract: An inkjet recording ink, including: a pigment; a water-soluble organic solvent; a surfactant; a polyether-modified silicone oil; a dispersing agent represented by the following General Formula (1) or (2); and water, wherein the water-soluble organic solvent contains: glycerin as a first water-soluble organic solvent; and a second water-soluble organic solvent, wherein the second water-soluble organic solvent is dipropylene glycol, 1,3-butanediol, 3-methyl-1,3-butanediol, 1,5-pentanediol, 1,6-hexanadiol, or any combination thereof, and wherein a mass ratio of the first water-soluble organic solvent:the second water-soluble organic solvent is 1:0.75 to 1:2.25, where R1 represents a C1-C20 alkyl group, an allyl group or an aralkyl group, L is an integer of 0 to 7, and n is an integer of 20 to 200, where m is an integer of 1 or greater.

Abstract: To provide an inkjet ink containing C4-6 diol; and trimethylglycine.

Abstract: An inkjet ink set containing a first pigment ink and a second pigment ink. The first pigment ink includes an anionic self-emulsification ether polyurethane, and the second pigment ink includes a styrene acrylic resin emulsion.

Abstract: An inkjet recording ink which includes: a carbon black; a dispersant, wherein the dispersant is a sodium naphthalenesulfonate-formalin condensate; resin emulsion; and water, in which the resin emulsion contains a resin which is at least one of a urethane resin and a styrene-acryl resin, and the ink satisfies the following relationship: 20?B?A?50, where A(nm) represents a particle diameter D90 of particles contained in dispersion containing the carbon black, the dispersant, and water, which is before added with the resin emulsion, and B(nm) represents a particle diameter D90 of particles contained in the ink.

Abstract: An inkjet recording ink, which contains: carbon black; a surfactant; water; a water-soluble organic solvent; and particles formed of an anionic self-emulsifying poly(ether urethane) resin, wherein the carbon black contains first carbon black whose surface has been treated with an anionic surfactant and second carbon black which has been coated with a resinous polymer, where a mass ratio of the first carbon black to the second carbon black is 10/90 to 90/10, and wherein the anionic surfactant is a naphthalenesulfonic acid-formaldehyde condensate.

Abstract: An inkjet recording ink set, which contains at least: a black pigment ink; and a color pigment ink, wherein the black pigment ink contains a black pigment treated with an anionic surfactant, and a black pigment coated with a resinous polymer, and water, and the black pigment ink is a pigment dispersion liquid where the black pigment treated with the anionic surfactant and the black pigment coated with the resinous polymer are dispersed in the water, and wherein the color pigment ink contains a color pigment, a nonionic surfactant, and water, and the color pigment ink is a pigment dispersion liquid where the color pigment is dispersed in the water with assistance of the nonionic surfactant.

Abstract: The present invention provides a colorant dispersion for a recording ink containing at least a dispersant, a colorant, and water, wherein the dispersant is a polycarboxylic acid dispersant containing units represented by formulae (1) to (3): where R1, R2, and R4 are selected from a hydrogen atom and CH3; R3 is selected from a hydrogen atom and a C1-C3 alkyl group; R5 represents a C1-C3 alkyl group; AO and BO represent a C2-C3 oxyalkylene group; M is selected from alkali metal, alkali earth metal, ammonium, and organic amine; m represents an integer of 1 to 30; and n represents an integer of 5 to 50.

Abstract: The inkjet ink includes a carbon black, a surfactant, water, and a water soluble organic solvent. The carbon black has a residue on sieve of from 0.1 ppm to 50 ppm, which is determined based on DIN ISO 787/18, and a statistical thickness surface area (STSA) of from 70 m2/g to 90 m2/g.