Abstract: Provided is an aqueous ink for ink jet including: pigments; a urethane resin; and a silicone-based surfactant. The pigments include a first pigment and a second pigment, the first pigment is a naphthol AS-based azo pigment and the second pigment is a quinacridone-based pigment. The urethane resin is a water-soluble urethane resin having a unit derived from a polyisocyanate, a unit derived from a polyol having no acid group and a unit derived from a polyol having an acid group. The silicone-based surfactant is at least one kind selected from the group consisting of compounds represented by the following respective general formulae (1) to (3), has a weight-average molecular weight of 800 or more to 10,000 or less and has an HLB value measured by Griffin's method of 4 or more.

Abstract: Provided is an aqueous ink that is suppressed from causing mist and is excellent in storage stability. The aqueous ink is an aqueous ink to be ejected from a recording head of an ink jet system through an action of thermal energy. The aqueous ink includes a first surfactant and a second surfactant. The first surfactant contains a compound represented by the following general formula (1) (in the general formula (1), “m” and “n” each independently represent an integer of 1 or more and satisfy a relationship of m+n?10, and “a” represents an integer of 10 or more to 20 or less). The second surfactant contains an acetylene glycol compound.

Abstract: Provided is an ink jet recording method by which even when an ink jet recording apparatus having a small size and high durability is used, excellent sticking recoverability is obtained and a high-quality image suppressed from causing unevenness can be recorded. The ink jet recording method includes recording an image with an ink jet recording apparatus including: a plurality of aqueous inks; a first ink storage portion; a second ink storage portion; a plurality of tubes; a recording head; and a recovery mechanism. The ratio (?2/?1) of the viscosity ?2 (mPa·s) of the second ink to the viscosity ?1 (mPa·s) of the first ink is 0.7 or more to 1.5 or less, and the first ink contains a first water-soluble organic solvent having a specific dielectric constant of 40.0 or more.

Abstract: Provided is an ink jet recording method by which even when an ink jet recording apparatus having a small size and high durability is used, excellent sticking recoverability is obtained and a high-quality image suppressed from causing unevenness can be recorded. The ink jet recording method includes recording an image with an ink jet recording apparatus including: a plurality of aqueous inks; a first ink storage portion; a second ink storage portion; a plurality of tubes; a recording head; and a recovery mechanism. The ratio (?2/?1) of the viscosity 112 (mPa·s) of the second ink to the viscosity ?1 (mPa·s) of the first ink is 0.7 or more to 1.5 or less, and the first ink contains a first water-soluble organic solvent having a specific dielectric constant of 40.0 or more.

Abstract: An aqueous ink for an ink jet including a silver particle that contains (i) a first organic monocarboxylic acid having a pKa of 4.60 or more and (ii) a second organic monocarboxylic acid having a pKa of less than 4.60 and having a carbon number of 2 or less.

Abstract: A method for ink-jet recording comprising recording an image on a recording medium using an ink-jet recording apparatus including a recording head equipped with a heat generation unit which generates thermal energy for discharging aqueous ink by discharging the aqueous ink from the recording head based on image data by action of the thermal energy, wherein the aqueous ink is discharged once by applying a single pulse waveform voltage to the heat generation unit in the recording, and wherein the aqueous ink includes silver particles.

Abstract: An ink jet recording method including the steps of a first recording step for applying a first ink to a recording medium and a second recording step for applying a second ink to the recording medium so as to overlap at least a region provided with the first ink, wherein the first ink is an aqueous ink containing silver particles, the second ink is an aqueous ink containing a dye, a time difference between applications of the first ink and the second ink to the recording medium is 1 sec or more to 7,200 sec or less, and the dye is a predetermined dye.

Abstract: An aqueous ink containing silver particles, a first reducing agent and a second reducing agent, wherein the first reducing agent is a compound that has an oxidation-reduction potential R1 (mV) satisfying R1<0, and the second reducing agent is a compound that has an oxidation-reduction potential R2 (mV) satisfying R2?0 and that is at least one selected from a group consisting of tertiary amines and polyhydric alcohols in which a plurality of hydroxy groups are included in one of two structures divided according to a position between any one of two adjacent carbon atoms of the longest carbon chain in the molecule.

Abstract: An aqueous ink for inkjet printing contains silver particles having a particle size of 60 nm or less at a cumulative volume of 90%.

Abstract: An ink jet recording method including the steps of a first recording step for applying a first ink to a recording medium and a second recording step for applying a second ink to the recording medium so as to overlap at least a region provided with the first ink, wherein the first ink is an aqueous ink containing silver particles, the second ink is an aqueous ink containing a dye, a time difference between applications of the first ink and the second ink to the recording medium is 1 sec or more to 7,200 sec or less, and the dye is a predetermined dye.

Abstract: An aqueous ink containing silver particles, a first reducing agent and a second reducing agent, wherein the first reducing agent is a compound that has an oxidation-reduction potential R1 (mV) satisfying R1<0, and the second reducing agent is a compound that has an oxidation-reduction potential R2 (mV) satisfying R2?0 and that is at least one selected from a group consisting of tertiary amines and polyhydric alcohols in which a plurality of hydroxy groups are included in one of two structures divided according to a position between any one of two adjacent carbon atoms of the longest carbon chain in the molecule.

Abstract: An aqueous ink for inkjet printing contains silver particles having a particle size of 60 nm or less at a cumulative volume of 90%.

Abstract: A method for ink-jet recording comprising recording an image on a recording medium using an ink-jet recording apparatus including a recording head equipped with a heat generation unit which generates thermal energy for discharging aqueous ink by discharging the aqueous ink from the recording head based on image data by action of the thermal energy, wherein the aqueous ink is discharged once by applying a single pulse waveform voltage to the heat generation unit in the recording, and wherein the aqueous ink includes silver particles.

Abstract: An ink for ink jet including a coloring material; and a water-soluble organic solvent. The coloring material contains a compound represented by the following general formula (I). The water-soluble organic solvent contains a compound represented by the following general formula (II) and a linear both-terminal alkanediol having 4 to 6 carbon atoms. The content A (mass %) of the compound represented by the following general formula (II) based on the total mass of the ink is 4.0-12.0 mass %, and the mass ratio (A/B) of the content A (mass %) to the content B (mass %) of the alkanediol based on the total mass of the ink is 2.5-4.

Abstract: An ink for ink jet including a coloring material; and a water-soluble organic solvent. The coloring material contains a compound represented by the following general formula (I). The water-soluble organic solvent contains a compound represented by the following general formula (II) and a linear both-terminal alkanediol having 4 to 6 carbon atoms. The content A (mass %) of the compound represented by the following general formula (II) based on the total mass of the ink is 4.0-12.0 mass %, and the mass ratio (A/B) of the content A (mass %) to the content B (mass %) of the alkanediol based on the total mass of the ink is 2.5-4.

Abstract: An ink containing a first coloring material and a second coloring material, the sum total of these contents being 6.0% by mass or less. The first coloring material is a black coloring material exhibiting a difference ??max1 of 20.0 or more between a maximum absorption wavelength in a 20.0% by mass aqueous solution of 1,2-hexanediol and a maximum absorption wavelength in water, the second coloring material is a specific coloring material exhibiting a difference ??max2 of 12.0 or less between a maximum absorption wavelength in a 20.0% by mass aqueous solution of 1,2-hexanediol and a maximum absorption wavelength in water, and the sum of the ??max1 and the ??max2 is 35.0 or less.

Abstract: The invention provides an ink containing a coloring material and a water-soluble organic solvent, wherein the coloring material is a compound represented by the following general formula (1), and the water-soluble organic solvent includes an alkanediol having 4 to 6 carbon atoms: wherein rings A, B, C and D each indicated by a broken line are, independently of one another, a benzene ring or a nitrogen-containing heteroaromatic ring, the number of the nitrogen-containing heteroaromatic ring is more than 0.0 and 3.0 or less, the remainder is the benzene ring, R1 is an alkyl group, R2 is an alkylene group, X is an anilino group having one or more sulfonic groups, m is more than 0.0 and less than 3.9, n is 0.1 or more and less than 4.0, and the sum of m and n is 1.0 or more and less than 4.0.

Abstract: An ink jet printing ink for use in an ink jet printing method. The ink is ejected from a print head by the action of thermal energy and includes water, a self-dispersing pigment, and at least two types of resin particles. One of the at least two types of resin particles (resin particle A) and another of the at least two types of resin particles (resin particle B) have an average particle size of 80 nm or more but 220 nm or less and an acid value of 25 mgKOH/g or more but 150 mgKOH/g or less. The resin particle A has a glass transition temperature of 25 degrees Celsius or less. The resin particle B has a glass transition temperature of 25 degrees Celsius or more. A difference in glass transition temperature between the resin particle A and the resin particle B is 10 degrees Celsius or more.

Abstract: The present invention provides an ink jet ink that is capable of recording an image excellent in light resistance and ozone resistance and has excellent intermittent ejection stability. The ink jet ink contains a coloring material and a water-soluble organic solvent. The coloring material contains a compound represented by the following general formula (I), the water-soluble organic solvent contains ethylene urea end an alkanediol having 4 to 6 carbon atoms, and a content A (% by mass) of the coloring material, a content B (% by mass) of the ethylene urea and a content C (% by mass) of the alkanediol having 4 to 6 carbon atoms based on a total mass of the ink satisfy relationships of 0.20?B/A?10.0 and 0.10?C/A?10.0.

Abstract: Aspects of the present invention provide an ink-jet recording method including the step of applying an ink to a recording medium by discharging the ink from a recording head by action of thermal energy and the step of fixing the ink to the recording medium by heating the ink applied to the recording medium. The ink contains water, a self-dispersing pigment, and resin particles. The resin particles have a glass transition temperature of not less than 25° C., an average particle diameter of 70 nm or more and 220 nm or less, and an acid value of 25 mg KOH/g or more and 150 mg KOH/g or less.