Abstract: An ink set includes an ink composition and a treatment liquid composition. Each of the ink composition and the treatment liquid composition is used for printing by being applied onto a printing medium by an ink jet method. The ink composition is a water-based composition containing a coloring material and a surfactant. The treatment liquid composition is a water-based composition containing a flocculant and a surfactant. Any one of the ink composition and the treatment liquid composition contains a nitrogen-containing solvent. Each of the surfactant contained in the ink composition and the surfactant contained in the treatment liquid composition includes a silicone surfactant whose 0.1 mass % aqueous solution has a surface tension of 32 mN/m or less. Any one of the surfactant contained in the ink composition and the surfactant contained in the treatment liquid composition includes a silicone surfactant whose 0.1 mass % solution in a nitrogen-containing solvent has a surface tension of 32 mN/m or less.

Abstract: An aqueous ink jet ink composition according to the present embodiment is an aqueous ink jet ink composition for use in an ink jet recording method that includes ejecting ink from an ink jet head. The ink jet head includes nozzles that have a side wall surface, and the side wall surface has a scalloped shape in which a scallop width S1 and a notch depth S2 satisfy S1/S2?4. The aqueous ink jet ink composition includes a self-dispersed pigment and a solvent that includes a compound represented by formula (1) below. R1—O—R2—OH??(1) In formula (1), R1 represents a hydrogen atom, a methyl group, or an ethyl group, and R2 represents a divalent saturated hydrocarbon group having 5 or fewer carbon atoms or represents a group represented by formula (2) below. R3—O—R4??(2) In formula (2), R3 and R4 each independently represent a divalent saturated hydrocarbon group having 2 or 3 carbon atoms.

Abstract: An ink set includes a black ink composition containing a black colorant and a chromatic ink composition containing a colorant and is used for recording on a low-absorbing or a non-absorbing recording medium. In the ink set, the black ink composition and the chromatic ink composition are both water-based ink jet inks, the chromatic ink composition contains a silicone-based surfactant 1 in which in a molecular weight distribution by a gel permeation chromatography, the maximum peak in a molecular weight range of 300 or more is located in a range of 3,000 to 20,000, and the black ink composition contains at least one of a glycol monoether solvent and a silicone-based surfactant 2 in which in a molecular weight distribution by a gel permeation chromatography, the maximum peak in a molecular weight range of 300 or more is located in a range of 300 to 1,500.

Abstract: A recording method is a method including an adhesion step of adhering an ink composition to a recording medium, in which the recording medium is a low-absorbing recording medium or a non-absorbing recording medium, the adhesion step is performed by scanning that is carried out by jetting the ink composition from an ink jet head to make the ink composition adhere to the recording medium while moving relative positions of the ink jet head and the recording medium, the scanning is performed seven times or less on an identical region of the recording medium, the ink composition is an aqueous ink containing a coloring material and a silicone-based surfactant A, and a maximum peak of the silicone-based surfactant A in a molecular weight range of 300 or greater is present in a range of 3000 to 20000 in a molecular weight distribution obtained by gel permeation chromatography.

Abstract: An ink set includes a non-white ink composition and a white ink composition, and the non-white ink composition and the white ink composition are each an aqueous ink jet ink. The non-white ink composition contains a silicone-based surfactant A having a maximum peak within a molecular weight range of 3,000 to 20,000 within a molecular weight range of 300 or more in a molecular weight distribution in gel permeation chromatography, and the white ink composition contains a silicone-based surfactant B having a HLB value of 10.5 or less by Griffin method, but not having a maximum peak within a molecular weight range of 3,000 or more within a molecular weight range of 300 or more in a molecular weight distribution in gel permeation chromatography.

Abstract: An ink set according to the present disclosure includes: a treatment liquid containing an aggregating agent; a deep ink composition; and a light ink composition, the ink compositions containing colorants, belonging to the same color system, and each being a water-based ink jet ink, the light ink composition contains an organic solvent which is a condensate of an alkanediol having 2 or 3 carbon atoms and which has two hydroxy groups, and the deep ink composition contains an organic solvent which is an alkanediol having 2 to 4 carbon atoms.

Abstract: An ink jet ink composition is a water-based ink that contains at least one pigment and at least one resin and is for use in recording on a low- or non-absorbent recording medium. The ink composition contains at least one water-soluble low-molecular-weight organic compound that has a melting point of 30° C. or above and is any of an amide, sulfur-containing compound, or cyclic ether, and the low-molecular-weight organic compound constitutes 10% by mass or less of the total mass of the ink composition. The ink composition also contains at least one organic solvent that is a diol having a melting point of 25° C. or below, and the organic solvent constitutes a higher percentage than the low-molecular-weight organic compound.

Abstract: An ink jet recording method includes: a treatment liquid adhesion step of adhering a treatment liquid containing an aggregating agent to a recording medium; an ink adhesion step of adhering an aqueous ink composition containing a colorant to the recording medium by ejection thereof from an ink jet head; a first heating step of heating the recording medium to which the treatment liquid and the aqueous ink composition are adhered to a first surface temperature by a first heating mechanism; a second heating step of heating the recording medium after the first heating step to a second surface temperature which is higher than the first surface temperature by a second heating mechanism provided at downstream than the first heating mechanism in a recording medium transport direction; and a cooling step of, after the first heating step and before the second heating step, cooling the recording medium by a cooling mechanism, and by the cooling step, a surface temperature of the recording medium is decreased to a temper

Abstract: A form of an ink set is an ink set including a flocculant-containing treatment liquid and an ink jet ink composition and is for use in recording on a low- or non-absorbent recording medium. The ink jet ink composition is a water-based ink containing at least one colorant, at least one water-soluble organic compound, having a solubility of more than 10 g in 100 g of water at 20° C., and at least one organic compound sparingly soluble in water, having a solubility of 0.1 to 10 g in 100 g of water at 20° C. The organic compound sparingly soluble in water includes a diol or glycol ether having a normal boiling point of 180° C. to 300° C., with the diol or glycol ether constituting 2.3% by mass or less of the total mass of the ink composition.

Abstract: An ink set includes a treatment liquid containing an aggregating agent and an ink composition, and the ink composition is a water-based ink containing a pigment dispersed by a pigment dispersant or a self-dispersible pigment; a water-dispersible resin; and a maleic acid-based resin which is a water-soluble resin.

Abstract: A recording method includes an adhesion step of ejecting an ink composition from an ink jet head to be adhered to a recording medium; and a primary heating step of heating the adhered ink composition, and the adhesion step includes at least one main scanning in which while a relative position of the ink jet head and the recording medium is changed in a main scanning direction, the ink composition is adhered to the recording medium and at least one sub-scanning in which the relative position of the ink jet head and the recording medium is changed in a sub-scanning direction.

Abstract: An ink jet recording method includes a treatment liquid attachment step, in which a treatment liquid containing a flocculant is attached to a recording medium, and an ink attachment step, in which an ink composition containing a pigment and resin particles is attached to the recording medium by ejecting the ink composition from an ink jet head. When the ink composition is mixed in a 1:1 ratio by mass with a 6% by mass aqueous solution of magnesium sulfate heptahydrate, the volume-average diameter of particles in the mixture is from 2000 to 6000 nm.

Abstract: An ink composition is used for recording on a low-absorbing recording medium or a non-absorbing recording medium and is an aqueous ink jet ink containing a pigment, and the ink composition includes 1.2 to 2.9 percent by mass of an amine with respect to a total mass of the ink composition, and an organic solvent other than an amine. The organic solvent includes an organic solvent having a standard boiling point of 150° C. to 250° C. in an amount of 5 to 30 percent by mass with respect to the total mass of the ink composition, and the organic solvent having a standard boiling point of 150° C. to 250° C. includes a diol having a water mixture viscosity of 3.0 mPa·s or more.

Abstract: An ink set includes an ink composition and a treatment liquid composition. Each of the ink composition and the treatment liquid composition is used for printing by being applied onto a printing medium by an ink jet method. The ink composition is a water-based composition containing a coloring material and a surfactant. The treatment liquid composition is a water-based composition containing a flocculant and a surfactant. Any one of the ink composition and the treatment liquid composition contains a nitrogen-containing solvent. Each of the surfactant contained in the ink composition and the surfactant contained in the treatment liquid composition includes a silicone surfactant whose 0.1 mass % aqueous solution has a surface tension of 32 mN/m or less. Any one of the surfactant contained in the ink composition and the surfactant contained in the treatment liquid composition includes a silicone surfactant whose 0.1 mass % solution in a nitrogen-containing solvent has a surface tension of 32 mN/m or less.

Abstract: An aqueous ink jet ink composition according to the present embodiment is an aqueous ink jet ink composition for use in an ink jet recording method that includes ejecting ink from an ink jet head. The ink jet head includes nozzles that have a side wall surface, and the side wall surface has a scalloped shape in which a scallop width S1 and a notch depth S2 satisfy S1/S2?4. The aqueous ink jet ink composition includes a self-dispersed pigment and a solvent that includes a compound represented by formula (1) below. R1—O—R2—OH??(1) In formula (1), R1 represents a hydrogen atom, a methyl group, or an ethyl group, and R2 represents a divalent saturated hydrocarbon group having 5 or fewer carbon atoms or represents a group represented by formula (2) below. R3—O—R4??(2) In formula (2), R3 and R4 each independently represent a divalent saturated hydrocarbon group having 2 or 3 carbon atoms.

Abstract: An ink set includes a first ink and a second ink which are water-based ink compositions, in which each of the first ink and the second ink includes a pigment and resin including resin particles, the first ink includes a first pigment and the second ink includes a second pigment different from the first pigment, the first ink and the second ink are mixed with a 5% by mass water-based solution of magnesium sulfate heptahydrate to increase a volume average particle diameter of the ink and a difference in the volume average particle diameter for the inks in the inks after mixing is 40% or less, and the ink set is used for recording together with a treatment liquid including an aggregating agent for aggregating the components of the water-based ink compositions.

Abstract: According to the invention, there is provided a recording method which includes adhering an ink composition to a recording medium, and adhering a reaction liquid to the recording medium, the reaction liquid containing water and a reagent for aggregating or thickening components of the ink composition, and having a pH of 7 to 10. In the adhering of the reaction liquid, an epoxy-based adhesive is used for at least a portion of a reaction liquid passage for supplying the reaction liquid to an ink jet head, and a member in contact with the reaction liquid in the ink jet head, and the reaction liquid is discharged from the ink jet head so as to adhere to the recording medium.

Abstract: An ink jet recording method includes: a treatment liquid adhesion step of adhering a treatment liquid containing an aggregating agent to a recording medium; an ink adhesion step of adhering an aqueous ink composition containing a colorant to the recording medium by ejection thereof from an ink jet head; a first heating step of heating the recording medium to which the treatment liquid and the aqueous ink composition are adhered to a first surface temperature by a first heating mechanism; a second heating step of heating the recording medium after the first heating step to a second surface temperature which is higher than the first surface temperature by a second heating mechanism provided at downstream than the first heating mechanism in a recording medium transport direction; and a cooling step of, after the first heating step and before the second heating step, cooling the recording medium by a cooling mechanism, and by the cooling step, a surface temperature of the recording medium is decreased to a temper

Abstract: An ink jet recording method includes a treatment liquid attachment step, in which a treatment liquid containing a flocculant is attached to a recording medium, and an ink attachment step, in which an ink composition containing a pigment and resin particles is attached to the recording medium by ejecting the ink composition from an ink jet head. When the ink composition is mixed in a 1:1 ratio by mass with a 6% by mass aqueous solution of magnesium sulfate heptahydrate, the volume-average diameter of particles in the mixture is from 2000 to 6000 nm.

Abstract: An ink jet recording method includes attaching ink by ejecting an ink composition from a head to attach to a recording region of a recording medium, and drying by heating the recording medium to which the ink composition is attached, in which the ink composition is a water-based ink composition including a resin and an amide compound represented by General Formula (1) as an organic solvent, and the drying dries the organic solvent in the recording region of the recording medium to be 2.0 mg/inch2 or less. In Formula (1), R1 represents a linear or branched alkyl group having 1 to 6 carbon atoms; R2 and R3s represent each independently H or a linear or branched alkyl group having 1 to 4 carbon atoms.