Abstract: The invention provides an ink for use in an ink jet recording process in which an ink is ejected from a recording head by the action of thermal energy, comprising a pigment, a water-soluble polyurethane polymer, a compound represented by a general formula (1) having a weight-average molecular weight of 1,000 or more and 8,500 or less, and a polyethylene oxide alkyl ether the alkyl group of which has 12 or more carbon atoms, wherein based on the total mass of the ink the content (mass %) of the compound represented by the general formula (1) is 0.4 times or more and 10.0 times or less in terms of mass ratio with respect to the content (mass %) of the polyethylene oxide alkyl ether.

Abstract: Provided are an ink with which an image excellent in both black density and glossiness can be recorded, and an ink cartridge and an ink jet recording method each using the ink. The ink includes: a carbon black; a resin for dispersing the carbon black; a resin fine particle; and a water-soluble organic solvent, in which: the resin fine particle contains at least a unit derived from an ethylenically unsaturated hydrophobic monomer, and a unit derived from a monomer selected from an ethylenically unsaturated acid monomer and a salt thereof, and a ratio of a unit derived from a saturated alkyl group-containing monomer to the unit derived from the ethylenically unsaturated hydrophobic monomer is 95.0 mass % or more; and the water-soluble organic solvent contains a water-soluble organic solvent having a dielectric constant at 20° C. of 18.0 or more and less than 30.0.

Abstract: Provided are an ink suitable for ink jet recording with which a color image excellent in both color developability and glossiness can be recorded, and an ink cartridge and an ink jet recording method in each of which the ink is utilized. Specifically, provided are an ink including: an organic pigment; a resin for dispersing the organic pigment; and a resin fine particle, in which an average particle diameter of the resin fine particle is 0.60 time or more and 1.2 times or less as large as an average particle diameter of the organic pigment, and an ink cartridge and an ink jet recording method in each of which the ink is utilized.

Abstract: Provided is an ink jet clear ink containing a polymer fine particle. The polymer fine particle has a core-shell structure obtained by polymerizing an ?,?-ethylenically unsaturated hydrophobic monomer (b) as a core polymer in the presence of a shell polymer that is a copolymer having at least a unit derived from an ?,?-ethylenically unsaturated hydrophobic monomer (a) and a unit derived from a monomer selected from an ?,?-ethylenically unsaturated acid monomer and a salt thereof. The ?,?-ethylenically unsaturated hydrophobic monomer (b) includes at least a monomer containing a chain structure saturated alkyl group.

Abstract: An ink includes a plurality of pigments, a plurality of water-soluble polymers, a surfactant, and a water-soluble organic solvent. The surfactant includes a polyoxyethylene alkyl ether having an HLB value of 13.0 or more as a value determined by a Griffin method, the plurality of pigments include C.I. Pigment Yellow 74 and C.I. Pigment Yellow 128, the plurality of water-soluble polymers include an acrylic polymer and a urethane polymer, and the water-soluble organic solvent includes a compound represented by the following Formula (1): HO—(CH2CH2O)n—H, wherein n is an integer of 1 to 4.

Abstract: Provided are an ink with which an image excellent in both black density and glossiness can be recorded, and an ink cartridge and an ink jet recording method each using the ink. The ink includes: a carbon black; a resin for dispersing the carbon black; a resin fine particle; and a water-soluble organic solvent, in which: the resin fine particle contains at least a unit derived from an ethylenically unsaturated hydrophobic monomer, and a unit derived from a monomer selected from an ethylenically unsaturated acid monomer and a salt thereof, and a ratio of a unit derived from a saturated alkyl group-containing monomer to the unit derived from the ethylenically unsaturated hydrophobic monomer is 95.0 mass % or more; and the water-soluble organic solvent contains a water-soluble organic solvent having a dielectric constant at 20° C. of 18.0 or more and less than 30.0.

Abstract: Provided are an ink suitable for ink jet recording with which a color image excellent in both color developability and glossiness can be recorded, and an ink cartridge and an ink jet recording method in each of which the ink is utilized. Specifically, provided are an ink including: an organic pigment; a resin for dispersing the organic pigment; and a resin fine particle, in which an average particle diameter of the resin fine particle is 0.60 time or more and 1.2 times or less as large as an average particle diameter of the organic pigment, and an ink cartridge and an ink jet recording method in each of which the ink is utilized.

Abstract: Provided is an ink jet clear ink containing a polymer fine particle. The polymer fine particle has a core-shell structure obtained by polymerizing an ?,?-ethylenically unsaturated hydrophobic monomer (b) as a core polymer in the presence of a shell polymer that is a copolymer having at least a unit derived from an ?,?-ethylenically unsaturated hydrophobic monomer (a) and a unit derived from a monomer selected from an ?,?-ethylenically unsaturated acid monomer and a salt thereof. The ?,?-ethylenically unsaturated hydrophobic monomer (b) includes at least a monomer containing a chain structure saturated alkyl group.