Abstract: An inkjet ink which contains a pigment, a water-soluble organic solvent, and an organic compound (but excluding the pigment and the water-soluble organic solvent), and in which the log P value of the water-soluble organic solvent is less than 1.258, the interface tension of the organic compound with respect to OPP is less than 20.7 mN/m, the value of (B)/(A) is 0.01-0.50 where (A) represents the total mass of the water-soluble organic solvent in the ink, and (B) represents the total mass of the organic compound, and the surface tension is less than 33.7 mN/m at 25° C.

Abstract: An inkjet ink which contains a coloring agent, an organic compound excluding the coloring agent, and water, and in which the organic compound contains a compound a such as diethyleneglycol monohexyl ether, a compound b such as 1,8-octane diol, and a compound c such as 1,5-pentane diol, and relationships of (a)?(c) and 0.1?(c)/(b)?50 are satisfied, when (a) represents, in parts by mass, the total contained amount of the compound a with respect to 100 parts by mass of the ink, (b) represents, in parts by mass, the total contained amount of the compound b with respect to 100 parts by mass of the ink, and (c) represents, in parts by mass, the total contained amount of the compound c with respect to 100 parts by mass of the ink.

Abstract: A recording ink comprising a coloring material, a first surfactant, a second surfactant, and water. The first surfactant includes a surfactant among polyoxyethylene ?-naphthyl ether, a dioctyl sulfosuccinic acid ester salt, and the like; and the second surfactant includes a surfactant among an alkylene oxide adduct of 2,4,7,9-tetramethyl-5-decyne-4,7-diol, polyoxyalkylene alkyl ether, and the like. An ink set and an ink media set which include the recording ink, and printing media to which the recording ink adheres.

Abstract: An inkjet ink which contains a coloring agent, an organic compound excluding the coloring agent, and water, and in which the organic compound contains a compound a such as diethyleneglycol monohexyl ether, a compound b such as 1,8-octane diol, and a compound c such as 1,5-pentane diol, and relationships of (a)?(c) and 0.1?(c)/(b)?50 are satisfied, when (a) represents, in parts by mass, the total contained amount of the compound a with respect to 100 parts by mass of the ink, (b) represents, in parts by mass, the total contained amount of the compound b with respect to 100 parts by mass of the ink, and (c) represents, in parts by mass, the total contained amount of the compound c with respect to 100 parts by mass of the ink.

Abstract: An inkjet ink which contains a pigment, a water-soluble organic solvent, and an organic compound (but excluding the pigment and the water-soluble organic solvent), and in which the log P value of the water-soluble organic solvent is less than 1.258, the interface tension of the organic compound with respect to OPP is less than 20.7 mN/m, the value of (B)/(A) is 0.01-0.50 where (A) represents the total mass of the water-soluble organic solvent in the ink, and (B) represents the total mass of the organic compound, and the surface tension is less than 33.7 mN/m at 25° C.

Abstract: An inkjet ink containing a pigment, a water-soluble organic solvent, and an organic compound excluding the pigment and the water-soluble organic solvent, in which the organic compound has an interfacial tension against PET of 15.50 mN/m or less, the value of (B)/(A) is 0.005-1, (A) is the total mass of said water-soluble organic solvent in the ink and (B) is the total mass of said organic compound, and the surface tension at 25° C. is 43.1 mN/m or less. An ink set and an ink medium set including the ink, and a printing medium to which the ink is adhered.

Abstract: Disclosed is an ink emulsion composition that, when used as an ink composition, retains a high concentration of a colorant and exhibits good re-dispersibility after drying, and that causes no change in the physical properties of the ink when stored for a long period of time. The ink emulsion composition contains: (A) a dye and/or a pigment; (B) a styrene-(meth)acrylic copolymer; and (C) a compound in an amount of more than 0.18 mass %, the compound (C) being represented by formula (1): where t represents 1 to 5.

Abstract: A dispersion composition that has good storage stability, achieves high density of a colorant when used as ink, has good redispersibility after drying, and preserves the physical properties of ink when stored for a long period of time is provided. The dispersion composition comprises: (A) a dye and/or a pigment; (B) a styrene-(meth)acrylic copolymer; and (C) a compound represented by the following formula (1): where t represents 1 to 5, wherein a content of (C) the compound represented by the formula (1) is more than 0.18 mass %, and a sum total of a sodium ion concentration, a potassium ion concentration, and a lithium ion concentration in the ink dispersion composition is 6800 ppm or less.

Abstract: Disclosed is an ink emulsion composition that, when used as an ink composition, retains a high concentration of a colorant and exhibits good re-dispersibility after drying, and that causes no change in the physical properties of the ink when stored for a long period of time. The ink emulsion composition contains: (A) a dye and/or a pigment; (B) a styrene-(meth)acrylic copolymer; and (C) a compound in an amount of more than 0.18 mass %, the compound (C) being represented by formula (1): where t represents 1 to 5.

Abstract: Disclosed is an ink emulsion composition that, when used as an ink composition, retains a high concentration of a colorant and exhibits good re-dispersibility after drying, and that causes no change in the physical properties of the ink when stored for a long period of time. The ink emulsion composition contains: (A) a dye and/or a pigment; (B) a styrene-(meth)acrylic copolymer; and (C) a compound in an amount of more than 0.18 mass %, the compound (C) being represented by formula (1): where t represents 1 to 5.