Abstract: Provided is an ink set including a plurality of inks each of which contains a water-insoluble coloring material and enabling ink-jet record images to be stably formed. The ink set includes first to nth aqueous inks for ink-jet recording, each of the aqueous inks containing a water-insoluble coloring material, an aqueous medium and a dispersant for dispersing the pigment in the aqueous medium, and a water-soluble organic compound, wherein the first to the nth aqueous inks are different from each other in pigment concentration based on the total weight of the each ink; and the first to the nth aqueous inks have the same or substantially the same viscosity at an actual usage temperature (T1).

Abstract: Provided is an ink which comprises an aqueous medium and a coloring material dispersed in the aqueous medium with a dispersant, where the coloring material is contained in an amount of at most 1% by weight with respect to the total weight of the ink, and the ratio (B/P ratio) of the dispersant to the coloring material is larger than 1.

Abstract: To suppress curling phenomenon of a recording medium to which a liquid composition is applied while securing ejection stability. A liquid composition for used in an image recording method including the steps of applying an ink containing a colorant in a dissolved state or a dispersed state to a recording medium and applying to the recording medium a liquid composition which destabilizes the dissolved state or the dispersed state of the colorant in the ink by coming into contact with the ink, the liquid composition including at least a polyvalent metal ion, water, and water-soluble organic compounds 1 and 2, in which a content X (mass %) of the water-soluble organic compound 1 in the liquid composition is 15 mass % or more, and the content X (mass %) of the water-soluble organic compound 1 in the liquid composition and a content Y (mass %) of the water-soluble organic compound 2 in the liquid composition satisfy a specific relationship.

Abstract: The present invention can sufficiently suppress curling phenomenon of a recorded product and facilitate handling of a printed product produced by using plain paper, in particular. The present invention provides a printing medium coating solution including water and a water-retentive, water-soluble organic compound, wherein the water-soluble organic compound includes only a water-soluble organic compound showing a difference of 36% or less between the water retention ability at a temperature of 23° C. and a humidity of 45% and the water retention ability at a temperature of 30° C. and a humidity of 80%; and the content of the water-soluble organic compound is 15 mass % or more with respect to the total amount of the printing medium coating solution.

Abstract: Ink jet ink which sufficiently suppresses curling phenomenon of printed matters and satisfies ejection stability, the ink comprising at least water, a colorant, a water-soluble organic compound 1 and a water-soluble organic compound 2, wherein the content X(%) of the water-soluble organic compound 1 is 10 mass % or more based on the total amount of the ink jet ink and the content X(%) of the water-soluble organic compound 1 and the content Y(%) of the water-soluble organic compound 2 based on the total amount of the ink jet ink satisfy the relation of the following formula (I) and formula (II): 0<Y/X?0.9,??(I) X+Y?15 mass %,??(II) and wherein the water-soluble organic compound 1 is a water-retentive, water-soluble organic compound having a difference between the water retention ability in an environment of a temperature of 23° C. and a humidity of 45% and the water retention ability in an environment of a temperature of 30° C.

Abstract: Provided is an ink-jet ink suitable for high speed printing and reduced ink ejection amount, wherein ink includes a water-insoluble coloring material dispersed in water with a resinous dispersant, glycerin, ethylene urea, and polyoxyethylene alkyl ether with HLB not lower than 13.

Abstract: In an liquid discharging head used in an ink-jet recording apparatus, in order to prevent damage of a face surface of orifices and degradation of a blade and maintain orifices in an excellent state preventing adherence of contamination to the face surface for a long time, the face surface is coated with a material having an ultrahigh water-repellent property.

Abstract: Disclosed herein is a textile printing process for dyeing a cloth black, the cloth comprising fibers dyeable with reactive dyes, the process comprising at least three steps of, (a) applying a black ink containing a black reactive dye and an orange ink containing an orange reactive dye to the cloth so as to at least partialy overlap each other by an ink-jet system, (b) heating or steaming the cloth, to which the inks have been applied in the step (a), and (c) washing the cloth resulted from the step (b), wherein the black and orange reactive dyes have reactive groups different from each other.

Abstract: An ink-jet textile printing system includes an ink-jet printing mechanism capable of textile printing on a printing object formed by a cloth product such as a T-shirt, a printing tray for holding a printing target range of the printing object flat, and conveying the printing object while positioning the printing target range with respect to the ink-jet printing mechanism, and a printing object formed by a cloth product such as a T-shirt having a partial pre-process portion obtained by partially pre-processing only the printing target range.

Abstract: Aqueous pigment ink and organic pigment powder are used for ink-jet recording to form high quality images. Organic pigment powder is prepared by finely granulating an organic pigment containing anthraquinone as principal ingredient by means of a vapor phase method to such an extent that the produced powder shows a number average particle diameter of primary particles of 10 to 50 nm. An aqueous ink contains such organic pigment powder.

Abstract: Provided is an ink which comprises an aqueous medium and a coloring material dispersed in the aqueous medium with a dispersant, where the coloring material is contained in an amount of at most 1% by weight with respect to the total weight of the ink, and the ratio (B/P ratio) of the dispersant to the coloring material is larger than 1.

Abstract: Provided is an ink-jet ink suitable for high speed printing and reduced ink ejection amount, which ink comprise a water-insoluble coloring material dispersed in water with a resinous dispersant, glycerin, ethylene urea, and polyoxyethylene alkyl ether with HLB not lower than 13.

Abstract: The present invention relates to a water-soluble addition polymer which is produced from a carboxylated diol represented by the following general formula (I) and a polyisocyanate and has an acid value of 100 to 250, and an aqueous ink using this polymer as a dispersant for a disperse dye: wherein the residue A is an aromatic, alicyclic or aliphatic polybasic acid residue, and the residue B is a trivalent aliphatic alcohol residue.

Abstract: Provided is an ink set including a plurality of inks each of which contains a water-insoluble coloring material and enabling ink-jet record images to be stably formed. The ink set includes first to nth aqueous inks for ink-jet recording, each of the aqueous inks containing a water-insoluble coloring material, an aqueous medium and a dispersant for dispersing the pigment in the aqueous medium, and a water-soluble organic compound, wherein the first to the nth aqueous inks are different from each other in pigment concentration based on the total weight of the each ink; and the first to the nth aqueous inks have the same or substantially the same viscosity at an actual usage temperature (T1).

Abstract: A liquid discharge head provided with a pair of substrates mutually adjoined in a laminar state, plural liquid flow paths formed on the adjoined surface of said substrates, plural drive elements respectively formed in a predetermined position of said liquid flow paths, and orifices communicating with ends of said liquid flow paths in which liquid discharged from said orifice by the action of said drive element, wherein a face constituting an external surface of a member forming said orifices is coated with a material with superhydrophilicity.

Abstract: Ink which can be rarely not discharged from an orifice after a pause of recording in diversified environments for use or even when a diameter of the orifice is reduced. This ink contains water-soluble coloring material, bis-hydroxyethyl sulfone and urea in an aqueous solvent.

Abstract: An ink set for use in an ink-jet recording method for recording a color image on a recording medium using four colors or more of ink, each ink includes a coloring material and a liquid medium, wherein any combination of two different inks causes aggregation of the coloring material by a chemical reaction on mutual contact on a recording medium.

Abstract: To provide an ink jet recording head substrate, an ink jet recording head, an ink jet recording unit, and an ink jet recording apparatus which allow scorch deposits on a heating section to be prevented by exerting on the section effect of providing super-hydrophilicity. The ink jet recording head substrate includes heating resistors formed through an insulating layer on a substrate which produce thermal energy used to eject ink, and the ink jet recording head includes an ejection orifice through which ink is ejected, and ink path which communicates with the ejection orifice and has a section exerting on the liquid thermal energy used to eject the liquid and heating resistors which produce thermal energy and an area corresponding to a heating section in which heat produced by the heating resistors acts on ink is given super-hydrophilicity treatment, and a contact angle between the area and water is 5° or less.

Abstract: Aqueous pigment ink and organic pigment powder is used for ink-jet recording to form high quality images. Organic pigment powder is prepared by finely granulating an organic pigment containing anthraquinone as principal ingredient by mean of a vapor phase method to such an extent that the produced powder shows a number average particle diameter of primary particles of 10 to 50 nm. Aqueous ink contains such organic pigment powder.

Abstract: Disclosed herein is a printing process in which at least two inks are applied to a cloth according to an ink-jet system to conduct printing, which comprises at least three steps of: (a) applying the two inks to the cloth in such a manner that at least a part of the inks overlaps each other; (b) subjecting the cloth, to which the inks have been applied, to a heat treatment; and (c) washing the heat-treated cloth, wherein the cloth is a cloth comprising fibers dyeable with disperse dyes, and each of the inks comprises a specified coloring matter, a compound for dispersing the coloring matter and an aqueous liquid medium.