Abstract: Provided is an aqueous ink for ink jet, which enables the recording of an image having satisfactory abrasion resistance and has satisfactory storage stability. The aqueous ink for ink jet includes: a wax; a dispersant for dispersing the wax; an ester compound; and a water-soluble organic solvent, wherein the wax is a wax represented by the following general formula (1), and the ester compound is an ester compound represented by the following general formula (2), wherein in the general formula (1), “n” represents an integer of 20 or more to 80 or less, and in the general formula (2), “a” and “b” each independently represent an integer of 1 or more, the integers satisfying 20<a+b+1580, and “c” represents an integer of 10 or more to 40 or less.

Abstract: Provided is an aqueous ink for ink jet capable of recording an image, which has abrasion resistance required in a commercial printing field and an industrial printing field and which is suppressed from being changed in glossy feeling when recorded matters are loaded and their recorded surfaces are rubbed against each other. The aqueous ink for ink jet includes a wax, (i) a nonionic dispersant for dispersing the wax and (ii) an anionic dispersant for dispersing the wax. The nonionic dispersant is a compound represented by the general formula (1) and has a HLB value of 9.0 or more to 18.0 or less. The anionic dispersant is a compound having at least one kind of anionic group selected from the group consisting of: a sulfonic acid group; a carboxylic acid group; and a phosphoric acid group.

Abstract: To provide an inkjet recording method capable of recording images with good ink ejection stability and excellent abrasion resistance while circulating ink between the ink storage portion and the recording head over a long period of time. An ink jet recording method in which an aqueous ink is ejected from a recording head and applied to a recording medium to record an image, the ink jet recording method uses an ink jet recording apparatus equipped with an ink circulation flow path for circulating the aqueous ink from an ink storage portion to the recording head, including the ink storage portion for storing the aqueous ink, the recording head of an ink jet system for ejecting the aqueous ink, a cooling portion for cooling the aqueous ink, a heating portion for heating the aqueous ink, and a pump for circulating the aqueous ink.

Abstract: The ink jet recording method is an ink jet recording method of recording an image on a recording medium using an ink jet recording apparatus including a recording head and a recovery mechanism for recovering an ejection state of pigment ink from ejection orifices. The recording head includes a first flow path and a second flow path allowing an ejection orifice and a recording element to communicate with each other and through which ink flows between the ejection orifice and the recording element. The ink jet recording method includes (i) a first cleaning of allowing the ink in the first flow path to flow to the second flow path while performing wiping and suction with a suction wiper; or (ii) a second cleaning of allowing the ink in the first flow path to flow to the second flow path after performing wiping and suction with a suction wiper.

Abstract: The ink jet recording method using an ink jet recording apparatus including: a first ink and a second ink; and a recording head including a plurality of recording element substrates in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are sequentially arranged in a predetermined direction, wherein the plurality of recording element substrates are arranged to be adjacent to each other in a predetermined direction, includes: a recording step of ejecting the ink from the recording head disposed so that an angle formed between the ejection orifice surface of the recording head and the direction of gravity is 0° or more to less than 90° to record an image on the recording medium, wherein a brightness of the first ink is lower than a brightness of the second ink.

Abstract: A ink jet recording method, which uses an ink jet recording apparatus including: first and second inks each containing a coloring material; and a recording head having an ejection orifice surface in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are formed, the first and second ejection orifice arrays being sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and at least partially overlap each other, includes recording, wherein at least one of the first and second inks contains a resin, and a content of the resin in the second ink is smaller than a content of the resin in the first ink.

Abstract: An ink jet recording method, which uses an ink jet recording apparatus including: first and second inks corresponding to aqueous inks containing a pigment; a recording head in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and the first and second ejection orifice arrays are arranged to at least partially overlap each other; and a cleaning member, includes: recording; and cleaning, wherein at least one of the first and second inks contains a resin, and a content of the resin in the second ink is larger than a content of the resin in the first ink.

Abstract: The ink jet recording method, which uses an ink jet recording apparatus, including: a first ink and a second ink containing a pigment; and a recording head having an ejection orifice surface in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are formed, wherein the first ejection orifice array and the second ejection orifice array are sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and arranged to at least partially overlap each other, includes: a recording step, wherein a true specific gravity of the pigment in the first ink is smaller than a true specific gravity of the pigment in the second ink.

Abstract: To provide an ink jet recording method using facedown discharge and capable of obtaining a recorded matter being suppressed a generation of minus curl. The method provided is an ink jet recording method including a step of recording an image on a recording medium having a first surface and a second surface by ejecting an aqueous ink from a recording head. This method further includes, after the recording step, a step of discharging the recording medium while placing the first surface or the second surface on which the image has been recorded last on a gravitationally lower side. In this method, the aqueous ink has a viscosity ?1 of 5.0 mPa·s or more and a difference ?2??1 between a viscosity ?2 of an evaporated ink obtained by evaporating 20% by mass of the aqueous ink and the viscosity ?1 of the aqueous ink is 4.0 mPa·s or more.

Abstract: The ink jet recording method is an ink jet recording method of recording an image on a recording medium using an ink jet recording apparatus including a recording head and a recovery mechanism for recovering an ejection state of pigment ink from ejection orifices. The recording head includes a first flow path and a second flow path allowing an ejection orifice and a recording element to communicate with each other and through which ink flows between the ejection orifice and the recording element. The ink jet recording method includes (i) a first cleaning of allowing the ink in the first flow path to flow to the second flow path while performing wiping and suction with a suction wiper; or (ii) a second cleaning of allowing the ink in the first flow path to flow to the second flow path after performing wiping and suction with a suction wiper.

Abstract: Provided is an ink jet recording method by which the decrease of degassing efficiency is suppressed even after images are recorded for a long period of time in a case where the degassing is performed while circulating an ink in an ink circulation system. An ink jet recording method recording an image on a recording medium by ejecting an ink from a recording head by using an ink jet recording apparatus equipped with an ink storage portion for storing the ink, the recording head for ejecting the ink, a unit for circulating the ink in an ink circulation system arranged between the ink storage portion and the recording head and a unit for degassing the ink circulating in the ink circulation system, the ink being an aqueous ink containing a pigment dispersed by an action of an anionic group, a resin particle and a specific water-soluble organic solvent.

Abstract: The ink jet recording method using an ink jet recording apparatus including: a first ink and a second ink; and a recording head including a plurality of recording element substrates in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are sequentially arranged in a predetermined direction, wherein the plurality of recording element substrates are arranged to be adjacent to each other in a predetermined direction, includes: a recording step of ejecting the ink from the recording head disposed so that an angle formed between the ejection orifice surface of the recording head and the direction of gravity is 0° or more to less than 90° to record an image on the recording medium, wherein a brightness of the first ink is lower than a brightness of the second ink.

Abstract: The ink jet recording method, which uses an ink jet recording apparatus, including: a first ink and a second ink containing a pigment; and a recording head having an ejection orifice surface in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are formed, wherein the first ejection orifice array and the second ejection orifice array are sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and arranged to at least partially overlap each other, includes: a recording step, wherein a true specific gravity of the pigment in the first ink is smaller than a true specific gravity of the pigment in the second ink.

Abstract: A ink jet recording method, which uses an ink jet recording apparatus including: first and second inks each containing a coloring material; and a recording head having an ejection orifice surface in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are formed, the first and second ejection orifice arrays being sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and at least partially overlap each other, includes recording, wherein at least one of the first and second inks contains a resin, and a content of the resin in the second ink is smaller than a content of the resin in the first ink.

Abstract: To provide an ink jet recording method using facedown discharge and capable of obtaining a recorded matter being suppressed a generation of minus curl. The method provided is an ink jet recording method including a step of recording an image on a recording medium having a first surface and a second surface by ejecting an aqueous ink from a recording head. This method further includes, after the recording step, a step of discharging the recording medium while placing the first surface or the second surface on which the image has been recorded last on a gravitationally lower side. In this method, the aqueous ink has a viscosity rp of 5.0 mPa·s or more and a difference ?2??1 between a viscosity ?2 of an evaporated ink obtained by evaporating 20% by mass of the aqueous ink and the viscosity rp of the aqueous ink is 4.0 mPa·s or more.

Abstract: An ink jet recording method, which uses an ink jet recording apparatus including: first and second inks corresponding to aqueous inks containing a pigment; a recording head in which a first ejection orifice array for ejecting the first ink and a second ejection orifice array for ejecting the second ink are sequentially arranged from the bottom in the direction of gravity to be adjacent to each other and the first and second ejection orifice arrays are arranged to at least partially overlap each other; and a cleaning member, includes: recording; and cleaning, wherein at least one of the first and second inks contains a resin, and a content of the resin in the second ink is larger than a content of the resin in the first ink.

Abstract: An aqueous ink for ink jet including a pigment; a water-soluble acrylic resin for dispersing the pigment; a water-soluble urethane resin; and a nonionic fluorinated surfactant. The water-soluble acrylic resin includes a copolymer having two or more units derived from two or more kinds of monomers, and of the two or more units, a unit derived from a monomer that gives a homopolymer having a glass transition temperature Tg of 0° C. or more is contained in a proportion of 95.0% by mass or more. The water-soluble urethane resin has a weight-average molecular weight of 6,000 or more.

Abstract: An aqueous ink for use in an ink jet recording method in which ink is thermally ejected from a recording head to record an image on a recording medium. The aqueous ink includes zirconium oxide; a pigment; a resin dispersant for the pigment; and a first and a second urethane resin. The content (ppm) of the zirconium oxide in terms of zirconium is 0.5-20.0 ppm based on the total mass of the ink. The pigment is at least one of phthalocyanine, quinacridone, diketopyrrolopyrrole, dioxazine, perinone, perylene and anthraquinone pigments. Each of the first and second urethane resins has a unit derived from a polyether polyol. The ratio of the weight-average molecular weight Mw1 of the first urethane resin to the weight-average molecular weight Mw2 of the second urethane resin is 0.20-0.80 times. The second urethane resin has a weight-average molecular weight Mw2 of 20,000-70,000.

Abstract: Provided is an ink jet recording method by which the decrease of degassing efficiency is suppressed even after images are recorded for a long period of time in a case where the degassing is performed while circulating an ink in an ink circulation system. An ink jet recording method recording an image on a recording medium by ejecting an ink from a recording head by using an ink jet recording apparatus equipped with an ink storage portion for storing the ink, the recording head for ejecting the ink, a unit for circulating the ink in an ink circulation system arranged between the ink storage portion and the recording head and a unit for degassing the ink circulating in the ink circulation system, the ink being an aqueous ink containing a pigment dispersed by an action of an anionic group, a resin particle and a specific water-soluble organic solvent.

Abstract: The present invention relates to an ink set enabling the recording of images that have excellent gloss clarity and abrasion resistance even when a plurality of inks are used in combination, and an ink jet recording method using the ink set.