Canon Kabushiki Kaisha

Yuhei Shimizu

Takashi Saito

Hideki Takayama

Masayuki Ikegami

Yoshio Nakajima

Akira Kuriyama

Eiichi Nakata

Yoko Taira

Kouhei Nakagawa

Hiroshi Kakikawa

Takakazu Mizutani

Kenji Nishiguchi

Tetsu Iwata

Katsuhiro Hayashi

Yuko Nishiwaki

Saki Wakao

The method is an ink jet recording method, which uses an ink set being composed of a plurality of aqueous inks and including a combination of a first ink containing a coloring material and a second ink containing no coloring material and by which an image is recorded by applying the first ink and the second ink onto a recording medium so that an area to which the first ink is applied and an area to which the second ink is applied overlap at least in part with each other. The coloring material of the first ink contains fluorescent dye, the second ink contains a first water-soluble organic solvent, and an SP value Sof the first water-soluble organic solvent and an SP value Sof the fluorescent dye satisfy a relationship of the following formula (1):||&#x2264;4.0&#x2003;&#x2003;(1).

Ink jet recording method and ink jet recording apparatus

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.

Ink-jet recording method and ink-jet recording apparatus

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.

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

Inkjet printing method and inkjet printing apparatus

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 2.5-4.0 times: 

Ink, ink cartridge, and ink jet recording method

The invention provides an ink for use in an ink jet recording process in which an ink is ejected from a recording head by the action of thermal energy, the ink comprising a pigment, a water-soluble polyurethane polymer, a compound represented by a general formula (1) having a weight-average molecular weight of 1,000 or more and 8,500 or less, and a polyethylene oxide alkyl ether, the alkyl group of which has 12 or more carbon atoms, wherein, based on the total mass of the ink, the content (mass %) of the compound represented by the general formula (1) is 0.4 times or more and 10.0 times or less in terms of mass ratio with respect to the content (mass %) of the polyethylene oxide alkyl ether.

Ink, ink cartridge and ink jet recording process

An ink set for ink jet includes a combination of a first ink and a second ink. The first ink contains a self-dispersible type carbon black and a specified particle A. The content of the particle A in the first ink is 0.05% by mass or more and 0.50% by mass or less, and the mass ratio of the content of the particle A to that of the self-dispersible pigment in the first ink is 0.056 times or more and 0.250 times or less. The second ink contains a specified particle B. The acid value a of the particle A and the acid value b of the particle B satisfy the relation of a&#x2266;b.

Ink set and ink jet recording method

An ink includes a plurality of pigments, a plurality of water-soluble polymers, a surfactant, and a water-soluble organic solvent. The surfactant includes a polyoxyethylene alkyl ether having an HLB value of 13.0 or more as a value determined by a Griffin method, the plurality of pigments include C.I. Pigment Yellow 74 and C.I. Pigment Yellow 128, the plurality of water-soluble polymers include an acrylic polymer and a urethane polymer, and the water-soluble organic solvent includes a compound represented by the following Formula (1): HO&#x2014;(CHCHO)&#x2014;H, wherein n is an integer of 1 to 4.

Provided are an ink with which an image excellent in both black density and glossiness can be recorded, and an ink cartridge and an ink jet recording method each using the ink. The ink includes: a carbon black; a resin for dispersing the carbon black; a resin fine particle; and a water-soluble organic solvent, in which: the resin fine particle contains at least a unit derived from an ethylenically unsaturated hydrophobic monomer, and a unit derived from a monomer selected from an ethylenically unsaturated acid monomer and a salt thereof, and a ratio of a unit derived from a saturated alkyl group-containing monomer to the unit derived from the ethylenically unsaturated hydrophobic monomer is 95.0 mass % or more; and the water-soluble organic solvent contains a water-soluble organic solvent having a dielectric constant at 20&#xb0; C. of 18.0 or more and less than 30.0.

Provided are an ink suitable for ink jet recording with which a color image excellent in both color developability and glossiness can be recorded, and an ink cartridge and an ink jet recording method in each of which the ink is utilized. Specifically, provided are an ink including: an organic pigment; a resin for dispersing the organic pigment; and a resin fine particle, in which an average particle diameter of the resin fine particle is 0.60 time or more and 1.2 times or less as large as an average particle diameter of the organic pigment, and an ink cartridge and an ink jet recording method in each of which the ink is utilized.

Provided is an ink jet clear ink containing a polymer fine particle. The polymer fine particle has a core-shell structure obtained by polymerizing an &#x3b1;,&#x3b2;-ethylenically unsaturated hydrophobic monomer (b) as a core polymer in the presence of a shell polymer that is a copolymer having at least a unit derived from an &#x3b1;,&#x3b2;-ethylenically unsaturated hydrophobic monomer (a) and a unit derived from a monomer selected from an &#x3b1;,&#x3b2;-ethylenically unsaturated acid monomer and a salt thereof. The &#x3b1;,&#x3b2;-ethylenically unsaturated hydrophobic monomer (b) includes at least a monomer containing a chain structure saturated alkyl group.

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Kawasaki, Japan

Yuhei Shimizu