Abstract: An ink for ink-jet recording that is used in an ink-jet recording apparatus. The ink-jet recording apparatus includes an ink-jet head provided with an ink flow passage formed of nickel-containing metal. The ink contains water, a coloring agent, and a polymer. The polymer contains at least one of —COOM and —SO3M, where M denotes at least one of an alkali metal ion and an ammonium ion.

Abstract: According embodiments of the present disclosure, a water-based ink set for ink-jet recording is provided. The ink set may contain a black ink, a cyan ink, a magenta ink and a yellow ink. Each ink may contain a polyoxyethylene alkyl ether sulfonate.

Abstract: A water base ink for ink-jet recording is provided, which makes it possible to secure a high recording quality with a sharp image area edge by avoiding any blurring even when recording is performed on regular paper and which has satisfactory purge restoration performance. Therefore, no bubble remains in an ink flow passage, and no discharge failure is caused. Further, the discharge operation never becomes unstable. In the water base ink for ink-jet recording, the surface tension is not less than 40 mN/m, and the amount of dissolved oxygen is not more than 4 mg/L.

Abstract: A water base ink for ink-jet recording is provided, which is excellent in time-dependent stability of ink characteristics, which can be stably jetted over a long period of time, and which makes it possible to perform the high quality recording. The water base ink for ink-jet recording contains a self-dispersing type water-insoluble particulate coloring agent, a compound represented by the following formula (1), a surfactant having a nitrogen atom in a molecule, water, and a water-soluble organic solvent, wherein a surface tension is 30 to 50 mN/m, and a ratio of change of the surface tension after storage at 60° C. for 2 weeks is less than 5%: R1—O—(CH2CH2O)x—SO3Na??(1) wherein R1 represents an alkyl group and x is 20 to 30 in the formula (1).

Abstract: A water base ink for ink-jet recording to be used for an ink-jet recording apparatus having an ink-jet head comprises a self-dispersing type coloring agent, water, and a water-soluble organic solvent. The surface tension of the ink is 30 to 50 mN/M, the advancing contact angle with respect to the jetting surface of the ink-jet head is not less than 65°, the receding contact angle is not less than 55°, and the difference between the advancing contact angle and the receding contact angle is not more than 20°. It is possible to jet the ink stably, it is possible to form a sharp recorded image with less blur, and it is possible to obtain the recorded image excellent in water resistance.

Abstract: A water based ink set for ink-jet recording includes a yellow ink, a magenta ink, a cyan ink, a black ink, and a red ink and/or a blue ink each including at least a coloring agent, water and a water soluble organic solvent. In the water based ink set, a water soluble dye is employed as the coloring agent of each of the yellow ink, the magenta ink and the cyan ink, and a pigment is employed as the coloring agent of each of the black ink and the red ink and/or the blue ink. In an ink-jet recording method employing the water based ink set for ink-jet recording, the red ink and the magenta ink are employed together for a magenta-ink-recording portion, and the blue ink and the cyan ink are employed together for a cyan-ink-recording portion.

Abstract: A water based ink set for ink-jet recording has a yellow ink, a magenta ink and a cyan ink each having at least a coloring agent, water and a water soluble organic solvent. The coloring agent of each of the black ink and the red ink is a pigment and the coloring agent of each of the yellow ink, the magenta ink and the cyan ink is a water soluble dye. The black ink and the red ink each have a dynamic surface tension at a lifetime of 100 ms of 40 mN/m or more and 45 mN/m or less as measured by a maximum bubble pressure method at 25° C.

Abstract: A water base ink for ink-jet recording contains 0.1% by weight to 4.0% by weight of C.I. Direct Yellow 132; not less than 0.5% by weight of glycol ether having a melting point of not more than ?45°C.; and a water-soluble organic solvent in which a solubility of C.I. Direct Yellow 132 at 20° C. is not less than 5%. The ink satisfies 0.2?B/A and 3?C/A. B/A represents a weight ratio of the glycol ether to the C.I. Direct Yellow 132 contained in the ink, and C/A represents a weight ratio of the water-soluble organic solvent to the C.I. Direct Yellow 132 contained in the ink. The stability in long-term storage after the evaporation of water or at low temperatures can be obtained even when C.I. Direct Yellow 132 is used in the water-base ink for the ink-jet recording.

Abstract: An ink set for ink-jet recording of the present invention includes a black ink which has a surface tension of not less than 40 mN/m at 25° C., and a color ink which has a surface tension of not less than 40 mN/m at 25° C. The viscosity ratio of the color ink with respect to the black ink is not less than 1.3. The feathering of the ink is avoided, and the bleeding, which would otherwise appear at the boundary between the black ink and the color ink, is avoided.

Abstract: A water base ink for ink-jet recording comprises water, self-dispersing type carbon black, an anionic surfactant, and a nonionic surfactant. The anionic surfactant is a surfactant represented by the formula (1) and/or a surfactant represented by the formula (2). The nonionic surfactant is a surfactant represented by the formula (3) or a mixture of a surfactant represented by the formula (4) and a surfactant represented by the formula (5). No ink discharge failure occurs, the long term stability is excellent, and it is possible to obtain a high quality image without any feathering.

Abstract: A water-based ink for ink-jet recording includes a reactive dye which forms chloride ions in the ink, benzotriazole, carboxybenzotriazole, water and a water soluble organic solvent. Examples of the reactive dye which forms chloride ions in the ink include triazine based reactive dyes and the like.

Abstract: An ink container including water-based ink for ink-jet recording and a package in which the water-based ink is accommodated, wherein the water-based ink includes an inert gas dissolved therein and an amount of oxygen dissolved in the water-based ink for ink-jet recording is less than 3 mL/L.

Abstract: The water-based ink set for ink-jet recording includes a magenta ink and a red ink with dynamic surface tensions thereof satisfying the following inequalities (IM), (IIM), (IIIM) and (IVM) ?30M?about 49 mN/m ??(IM) ?30M+?30R?about 100 mN/m ??(IIM) wherein ?30M is the dynamic surface tension of the magenta ink at a lifetime of 30 ms and ?30R is the dynamic surface tension of the red ink at a lifetime of 30 ms, ?1000R?about 36 mN/m ??(IIIM) ?1000M+?10000R?about 70 mN/m ??(IVM) wherein ?1000 M is the dynamic surface tension of the magenta ink at a lifetime of 1,000 ms and ?1000R is the dynamic surface tension of the red ink at a lifetime of 1,000 ms).

Abstract: The water-based ink set for ink-jet recording includes a cyan ink and a blue ink with dynamic surface tensions thereof satisfying the following inequalities (ICB), (IICB), (IIICB) and (IVCB) ?30C?about 49 mN/m??(ICB) ?30C+?30B?about 100 mN/m??(IICB) wherein ?30C is the dynamic surface tension of the cyan ink at a lifetime of 30 ms and ?30B is the dynamic surface tension of the blue ink at a lifetime of 30 ms, ?1000B?about 36 mN/m??(IIICB) ?1000C+?1000B?about 70 mN/m??(IVCB) wherein ?1000C is the dynamic surface tension of the cyan ink at a lifetime of 1,000 ms and ?1000B is the dynamic surface tension of the blue ink at a lifetime of 1,000 ms.

Abstract: A water-based ink for ink-jet recording and an ink-jet recording method allow the formation of sharp text and lines in high density black, and the formation of a high quality gradation image in which the graininess is reduced in a black image of a medium lightness to a high lightness (e.g., an achromatic image in dark gray to light gray) in ink-jet recording. The water-based ink combination for ink-jet recording comprises a black ink, and a color ink (A) and a color ink (B) that satisfy a color relationship of the following expression (I): about 120°?|???|?about 240°??(I) wherein ? is the hue angle of the color ink (A) and ? is the hue angle of the color ink (B).

Abstract: A water-based ink for ink-jet recording enables the expression of sharp text and lines in high density black, and the formation of a high quality gradation image in which the graininess is reduced in a black image of medium to high lightness. The inks include a color ink (A) and a color ink (B) each of which independently has a lightness index L* according to the L* a* b* calorimetric system of about 60 or less. The color ink (A) and the color ink (B) satisfy the following expression (I): about 120°?|???| about ?240°??(I) wherein ? is the hue angle of the color ink (A) and ? is the hue angle of the color ink (B). The chroma C* of a hue obtained by the combination of the color ink (A) and the color ink (B) is about 30 or less.

Abstract: A water base ink for ink-jet recording is provided, which makes it possible to secure a high recording quality with a sharp image area edge by avoiding any blurring even when recording is performed on regular paper and which has satisfactory purge restoration performance. Therefore, no bubble remains in an ink flow passage, and no discharge failure is caused. Further, the discharge operation never becomes unstable. In the water base ink for ink-jet recording, the surface tension is not less than 40 mN/m, and the amount of dissolved oxygen is not more than 4 mg/L.

Abstract: A water based ink set for ink-jet recording, capable of reducing graininess, is composed of a combination of a diluting ink and one or more coloring inks. The diluting ink contains at least water and a water soluble organic agent and does not substantially contain a coloring agent, and the coloring ink contains at least a coloring agent, water and a water soluble organic solvent. In this ink set, the dynamic surface tension of the diluting ink is set to be higher than that of the coloring ink.

Abstract: A water base ink for ink-jet recording is provided, which makes it possible to perform the discharge operation stably and highly accurately for a long period of time without deteriorating a metal, for example, due to corrosion and/or dissolution even when the ink makes contact with the metal composed of nickel or an alloy containing nickel for a long period of time. The water base ink for ink-jet recording is usable for an ink-jet recording apparatus provided with an ink-jet head having a metal member which is composed of nickel or the alloy containing nickel and which is disposed at least in an ink supply passage for supplying the ink to a discharge section. The water base ink for ink-jet recording contains potassium p-tert-butylbenzoate, a coloring agent which is dispersible or soluble in water, water, and a water-soluble organic solvent.

Abstract: A water-based ink for ink jetting and ink jet recording method, in which stable jetting, clearness of the recorded matter, high density recording, water resistance, and friction resistance are well-balanced, and being useful for ink for various types of ink jet recording. After 5% of the water soluble colored resin comprising 5,5?-dimethylhydantoinformaldehyde resin and color index number basic red 1:1 and 10% of polyethyleneglycol (average molecular weight 200) and 6% of triethyleneglycolmonometylether and 79% of pure water are fully stirred to be mixed, the mixture is filtered with a membrane filter of 0.8 ?m thickness to become ink. Experimental evaluation using the recording head regarding jetting stability, jetting response, quality of the recorded images, friction resistance against various recording materials, and water resistance against various recording materials is made, and good results are obtained.