Canon Kabushiki Kaisha

Yoshihisa Yamashita

Katsuhiro Shirota

Akio Kashiwazaki

Masashi Hirose

Hayato Ida

Takeshi Miyazaki

Noribumi Koitabashi

Takashi Saito

Shoji Koike

Koichiro Nakazawa

Nobuyuki Matsumoto

Kohei Watanabe

Yuko Negishi

Mayumi Yokoyama

Kenji Nishiguchi

Aki Takano

Yasunori Fujimoto

Katsuhiko Suzuki

Hirofumi Ichinose

Hideki Takayama

Ryota Kato

Tsuyoshi Furuse

Hideto Kuribayashi

Masashi Tsujimura

Shin-ichi Sato

Fumiaki Fujioka

Hiromitsu Kishi

Ayako Uji

Yojiro Kojima

Sayoko Nagashima

Fumihiko Mukae

Toshiyuki Umesato

Ryuki Nanamiya

An aqueous ink containing a self-dispersible pigment for use in an ink jet recording method using a recording head that ejects an ink by an action of thermal energy. The aqueous ink contains a compound represented by General Formula (I): where in General Formula (I) R's are independently of each other, a sulfonic acid group, a carboxylic acid group, a phosphoric acid group or a phosphonic acid group, Ris a hydrogen atom or an alkyl group, and n is an integer of 1 to 5.

Ink, ink cartridge, and ink jet recording method

An aqueous ink for ink jet containing a self-dispersible pigment, a compound represented by General Formula (I): where in General Formula (I) each R1 independently represents a hydrogen atom or an alkyl group.

An aqueous ink for ink jet containing a self-dispersible pigment, an aromatic sulfinic acid or a salt thereof and an aromatic sulfonic acid or a salt thereof.

An ink jet ink contains a resin A, a resin B, and a pigment, in which the pigment is a halogenated metal phthalocyanine pigment being dispersed by the resin B, the resin A is a random copolymer having a carboxy group, the resin B is a block copolymer having a carboxy group, the acid value of the resin A is less than the acid value of the resin B, and the ink further includes a polybasic acid having a functional group whose pKa is 4.3 or less and a functional group whose pKa is 5.0 or more and 6.6 or less.

Ink jet ink, ink cartridge, and ink jet recording method

Provided are an ink jet ink set, an ink jet recording method, and an ink jet recording apparatus each of which can reduce the graininess of an image to be recorded and improve the water fastness of the image even in a recording medium such as plain paper. The ink jet ink set has a first ink and a second ink independently, and is used so that the first and second inks overlap each other at least partly upon application of the inks to a recording medium. The first ink contains at least a pigment and a silicone oil. The second ink contains at least a pigment and a graft polymer that includes at least a nonionic unit represented by the general formula (I) and a unit having a polysiloxane structure.

Ink jet recording method, and ink jet recording apparatus

An ink set includes a combination of a first ink and a second ink, the first ink containing a self-dispersion pigment having at least one hydrophilic group directly or through another atomic group bonded to the surface of the pigment particle, and ammonium ions, the second ink containing a pigment, a polymer having an acid value of 160 mg KOH/g or less, and alkali metal ions, wherein the first ink further contains a compound (A) selected from nonionic surfactants and/or a compound (B) selected from the group consisting of polyethylene glycol with an average molecular weight of 600 to 2,000, &#x3b1;,&#x3c9;-alkanediol having six carbon atoms, and an imidazolidinone derivative.

Ink set, ink jet recording method, ink cartridge, recording unit, and ink jet recording apparatus

The present invention provides an ink-jet recording method for forming an image by applying an ink to a recording medium, wherein the ink used contains at least water, a pigment, a dispersing agent for dispersing the pigment and an acid form of an anionic surfactant. The ink has a surface tension higher than the critical surface tension of the recording medium. The ink is applied to the recording medium, and the surface tension of the ink is reduced to a surface tension below the critical surface tension of the recording medium after contacting the recording medium.

Ink-jet recording method, ink-jet ink, ink-jet recording unit, ink cartridge for ink-jet recording and ink-jet recording apparatus

An ink jet recording apparatus is provided with a plurality of inks and includes a unit configured to perform a recovery operation by suction of inks from a plurality of ink ejection portions using a suction cap, wherein the plurality of inks include an ink set including a combination of at least a first ink and a second ink, the first ink containing (i) a self-dispersion pigment having at least one hydrophilic group directly or through another atomic group bonded to the surface of the pigment, and (ii) ammonium ions, the second ink containing a pigment, a polymer having an acid value of 160 mg KOH/g or less, and alkali metal ions, and the suction cap used in the recovery operation is individually provided for each of the first ink and the second ink.

Ink jet recording apparatus and ink jet recording method

The present invention provides an ink-jet recording method for forming an image by applying an ink to a recording medium. The ink contains at least water, a colorant and a surfactant. The content of the surfactant is higher than or equal to the critical micelle concentration of the surfactant, and the ink used has a surface tension lower than or equal to the critical surface tension of the recording medium. The ink is applied on the recording medium, and the surface tension of the ink is increased to a surface tension higher than the critical surface tension of the recording medium after the ink contacts the recording medium.

The present invention provides an ink-jet recording ink containing water, a pigment, a dispersing agent for dispersing the pigment, and an anionic surfactant having a critical micelle concentration lower than or equal to 0.0005 mol/L.

Ink-jet recording ink, ink cartridge, recording unit, ink-jet recording method, ink-jet recording apparatus, and method for stabilizing ink ejection

An ink for use in ink jet recording which contains a dye and a pigment as colorants. The pigment is a self-dispersible pigment in which at least one anionic group is bonded directly or through another atomic group to a surface of the pigment, the dye is an anionic dye, 2-pyrrolidone is further contained in the ink as a solvent, and the mass-based content X of 2-pyrrolidone in the ink and the ratio Y of the pigment to the sum of the dye and the pigment satisfy the following formulas 1 to 3 at the same time:12&#x2266;X&#x3c;30&#x2003;&#x2003;formula 150&#x2266;Y&#x2266;75&#x2003;&#x2003;formula 2&#x2267;&#x2212;2+84&#x2003;&#x2003;formula 3.

Ink for use in ink jet recording and ink jet recording method utilizing the same

An embodiment of the invention relates to an aqueous dispersion containing pigment-containing particles. The dispersion is an aqueous dispersion comprising particles containing a water-insoluble colorant dispersed in a water-containing medium, wherein the light-scattering intensity of the dispersion is at most 30,000 cps when the absorbance peak value of the dispersion in a visible region is regarded as 1.

Aqueous dispersion of water-insoluble-colorant-containing particle and preparation process thereof, water-insoluble-colorant-containing particle and preparation process thereof, and ink

A liquid crystal elemental device comprising a pair of substrates arranged in opposed relation to each other through a spacer and a liquid crystal held in a space between the substrates is produced by applying a spacer-forming material onto one of the pair of substrates by an ink-jet system to form the spacer, arranging the pair of substrates in opposed relation to each other with the spacer held therebetween, and enclosing a liquid crystal compound in the space between the pair of substrates.

Growing community of inventors

Kawasaki, Japan

Yoshihisa Yamashita