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 magenta ink for ink-jet recording contains a coloring agent, water and a water soluble organic solvent. Different types of dyes are employed as the coloring agent. In particular, a dye (1) represented by the general formula (1) is used together with at least one dye selected from the group consisting of a dye (2) represented by the general formula (2) in a free acid form, C. I. Acid Red 289 and C. I. Acid Red 52.

Abstract: An ink set for ink-jet recording is formed from a yellow ink in which C. I. Direct Yellow 132 and C. I. Direct Yellow 86 are employed, a magenta ink in which a specific pyrazolylazopyridine-based (or pyrazolylazopyrazine-based) dye and another specific dye are employed, and a cyan ink in which two specific types of copper phthalocyanine-based dyes are employed.

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 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: 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 contains self-dispersible carbon black as a coloring agent. The total content of an organic acid having a number of carbon or carbons of 1 to 6 and a salt of the organic acid is not more than 400 ppm. The organic acid having a number of carbon or carbons of 1 to 6 includes monocarboxylic acid, dicarboxylic acid and oxy acid, and the salt of the organic acid includes salts of these acids. When the water base ink is used in an ink-jet recording apparatus, the discharge stability of the ink is improved.

Abstract: A water base ink for ink-jet recording contains self-dispersible carbon black as a coloring agent. The total content of an organic acid having a number of carbon or carbons of 1 to 6 and a salt of the organic acid is not more than 400 ppm. The organic acid having a number of carbon or carbons of 1 to 6 includes monocarboxylic acid, dicarboxylic acid and oxy acid, and the salt of the organic acid includes salts of these acids. When the water base ink is used in an ink-jet recording apparatus, the discharge stability of the ink is improved.

Abstract: An ink for ink-jet recording is provided, which makes it possible to obtain vivid recorded matters by satisfying both of the prevention of the feathering and the prevention of the bleeding even when the recording is performed on regular paper. The ink for ink-jet recording contains a self-dispersing type microparticulate coloring agent, a surfactant, and water. When the surface tension is plotted in the vertical axis, and the concentration of the surfactant is plotted in the horizontal axis, then the correlation between the surface tension and the concentration of the surfactant can be represented by a correlation curve which has one inflection point and which has two local maximum points of curvature on both sides of the inflection point one by one. Further, the ink for ink-jet recording contains the surfactant at a concentration which is higher than a concentration corresponding to the local maximum point of the curvature on the low concentration side.

Abstract: The present disclosure relates to an ink-jet ink set which, in spite of using a black ink including a black pigment, may form printed matter (e.g., images) with desirable fixability to glossy paper, color balance after fading (fading stability), and/or water resistance and/or ink-jet ink sets with desirable storage stability. An ink set may include a yellow dye ink including a yellow dye, a magenta dye ink including a magenta dye, a cyan dye ink including a cyan dye and a black ink. A black ink may include a black pigment, a yellow dye, a magenta dye and a cyan dye. A black ink may have a weight ratio of the amount of the black pigment to the total amount of the yellow dye, the magenta dye, and the cyan dye of from about 30/70 to less than about 70/30 (e.g., from about 30/70 to about 70 (but not inclusive of 70)/30).

Abstract: A water base ink for ink-jet recording contains self-dispersible carbon black as a coloring agent. The total content of an organic acid having a number of carbon or carbons of 1 to 6 and a salt of the organic acid is not more than 400 ppm. The organic acid having a number of carbon or carbons of 1 to 6 includes monocarboxylic acid, dicarboxylic acid and oxy acid, and the salt of the organic acid includes salts of these acids. When the water base ink is used in an ink-jet recording apparatus, the discharge stability of the ink is improved.

Abstract: New blue inks are provided for inkjet printing, on papers which are typically difficult to print with good quality, high-contrast images. The inks are characterized by a color of the ink (color illumination D65) of L*: about 37±5, a*: about 7±7, b*: about ?27±8. The inks contain an aqueous vehicle including water and a humectant comprising a polyhydric alcohol, a water-soluble polymer effective to improve the “hold out” properties of the dye-based ink on paper, surfactant, and a blue dye. The relative amounts of the aqueous vehicle, the water-soluble polymer, the surfactant and the blue dye, are effective to provide an ink having a viscosity and surface tension effective for inkjet printing, having a viscosity of from about 2 to about 4 mPa·s and a surface tension of from 30 to 50 mN/m. Also provided are a process for printing an image and a printed image prepared using the ink.

Abstract: New blue inks are provided for inkjet printing, especially using piezoelectric printers, on papers which are typically difficult to print with good quality, high-contrast images. The inks are characterized by a color of the ink (color illumination D65) of L*: about 37±5, a*: about 7±7, b*: about ?27±8. The inks contain an aqueous vehicle including water and a humectant comprising a polyhydric alcohol, a penetrant, surfactant, and a blue dye. The relative amounts of the aqueous vehicle, the penetrant, the surfactant and the blue dye, are effective to provide an ink having a viscosity and surface tension effective for inkjet printing, especially for piezoelectric printing, having a viscosity of from about 2 to about 4 mPa·s and a surface tension of from 30 to 50 mN/m. Also provided are a process for printing an image and a printed image prepared using the ink.

Abstract: A cyan ink for ink-jet recording contains a coloring agent, water and a water soluble organic solvent. Different types of dyes are employed as the coloring agent. In particular, a dye represented by the general formula (1) is used together with at least one dye selected from the group consisting of a dye represented by the general formula (2), a dye represented by the general formula (3) and C. I. Direct Blue 86. In the formulas, Pc(Cu) is a copper phthalocyanine nucleus.

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.

Abstract: A water-based ink set for ink-jet recording includes at least a yellow ink, a magenta ink and a cyan ink. At least one color ink of the yellow, magenta and cyan inks includes a first ink and a second ink which have different hue angles h having therebetween the color range of the normal color of the color ink. Preferably, the yellow ink includes a greenish yellow ink having a hue angle h of about 95° to about 110° and a reddish yellow ink having a hue angle h of about 70° to about 85°; the magenta ink includes a reddish magenta ink having a hue angle h of about 0° to about 10° and a violetish magenta ink having a hue angle h of about 340° to about 350°; and the cyan ink includes a bluish cyan ink having a hue angle h of about 250° to about 260° and a greenish cyan ink having a hue angle h of about 230° to about 240°.

Abstract: An ink for ink-jet recording contains tripropylene glycol normal butyl ether or dipropylene glycol normal propyl ether, an acrylic polymer, a water-insoluble coloring agent, and water. The ink simultaneously satisfies the straight travel stability of ink droplets during the discharge with an ink-jet recording apparatus, the recovery performance upon introduction into a recording head of the ink-jet recording apparatus, the fixation performance of printed matters, and the drying performance after the printing.

Abstract: An ink set for ink-jet recording includes a pigment-based ink containing a negatively chargeable and self-dispersible pigment as a coloring agent and a dye-based ink containing an anionic dye as a coloring agent, and the ink set satisfies the following expression (1): Dci<1.1×Pci+0.0001??(1) wherein “Dci” represents an amount of counter ion (mol/g) of the anionic dye contained in the dye-based ink, and “Pci” represents an amount of counter ion (mol/g) of the self-dispersible pigment contained in the pigment-based ink. The pigment aggregation can be greatly suppressed, and the high quality printing can be stably performed when the ink set for ink-jet recording composed of the pigment-based ink and the dye-based ink is carried on an ink-jet printer provided with a conventional maintenance system that is simple and at low cost.

Abstract: New ink-jet printing inks provide red printed images with high-intensity fluorescence emission and are capable of printing images that can be used for high density bar code applications (2D bar codes) having high readability. The inks are aqueous and capable of producing machine-readable markings exhibiting fluorescence when exposed to fluorescent-exciting radiation. They exhibit a peak of fluorescence between about 500 nm and about 700 nm and a fluorescent strength of the ink diluted by 100 times of more than about 70 by excitation of ultraviolet radiation. The inks exhibit a peak of absorbance of between about 400 nm and about 600 nm, and an absorbance of the ink diluted by 100 times and measured in 1 mm cell of more than about 0.6. The preferred inks are characterized by a color of the ink diluted by 100 times with water and measured in 1 mm cell is t L*: about 80±10, a*: about 45±20, b*: about 20±35 and a color of the printed image of L*: about 65±10, a*: about 55±10, b*: about 5±20.

Abstract: Ink-jet inks and methods for security and anti counterfeiting utilities are described. The inks are fluorescent with a particular characterizing emission when illuminated with ultraviolet or other interrogating light and then fluoresce with a different characteristic upon illumination with bright light such as from a copying machine. The inks comprise a fluorescent dye, an aqueous liquid vehicle comprising water and organic solvents in sufficient amounts to achieve an ink viscosity and surface tension effective for application of the ink to a substrate in a predetermined pattern by ink-jet printing, wherein the inks are characterized in that after exposing under Xenon lamp of 3,150,000 J/m2, the fluorescent strength of the ink diluted 100 times existing between about 500 nm and about 700 nm by excitation of ultraviolet radiation, decreases by at least about 50%.