Canon Kabushiki Kaisha

Cabot Corporation

Mikio Sanada

Sadayuki Sugama

Tomonari Watanabe

Yoshihisa Takizawa

Masashi Ogasawara

Kenji Moribe

Hiroki Hayashi

Katsuhiko Takahashi

Shinya Mishina

Yui Tokuda

Yoshifumi Hattori

Yasuhiro Nito

Mayumi Yamamoto

Koichi Osumi

Hisashi Teraoka

Satoshi Kudo

Hajime Yamamoto

Takashi Imai

Eiichiro Shimizu

Kenji Kitabatake

Nobuyuki Matsumoto

Hiroshi Koshikawa

Shinichi Hakamada

Daiji Okamura

Kumiko Mafune

Eriko Saito

Noribumi Koitabashi

Shinichi Sato

Yoichi Takada

Shozo Hattori

Shigemoto Abe

Hideki Yamakami

Tetsu Iwata

Sayoko Nagashima

Akira Nagashima

Yoshiyuki Nakagawa

Shingo Okushima

Keiichi Murai

Junichi Sakai

Hiroyuki Takuhara

Arihiro Saito

Yuuki Nishino

Yasuhito Mori

Fumiharu Nakamura

Yuko Yakushigawa

Satomi Yanagimachi

Yui Kitamura

Hiromitsu Hirabayashi

Koichi Suzuki

Masanori Takenouchi

Keiichiro Tsukuda

Yuji Hamasaki

Yutaka Kurabayashi

Shuzo Iwanaga

Toshiharu Inui

Masaya Uetsuki

Osamu Morita

Fumihiro Gotoh

Miyuki Fujita

Michinari Mizutani

Tsuyoshi Eida

Ryuji Higashi

Takao Yamamoto

Jun Hinami

Ryuji Katsuragi

Hideki Takayama

Taiki Watanabe

Kouhei Nakagawa

Masashi Tsujimura

Yoshihide Aikawa

Yoshiyuki Kaneko

Osamu Nishiwaki

Masahiko Tonogaki

Shin-ichi Hakamada

Eriko Ono

Souichi Nagai

Yuko Takada

Shoichi Takeda

Yoshihisa Yamashita

Shin-Ichi Hakamada

Koicho Osumi

An aqueous ink for ink jet recording includes a titanium oxide particle containing titanium oxide, at least part of the surface of the titanium oxide being covered with alumina and silica in specific proportions, in which the titanium oxide particle is dispersed at least by the action of the silica, and the ratio (η/η) of the viscosity (η) of the aqueous ink at a shear rate of 1 (1/s) to the viscosity (η) at a shear rate of 1,000 (1/s) is 1.10 times or less.

Aqueous ink, ink cartridge and ink jet recording method

To provide an ink jet recording method which can record an image on a recording medium irrespective of what material is selected therefor. The ink jet recording method is a method of recording an image on a recording medium with a colorless transparent aqueous ink and includes a step of applying, to the recording medium, the aqueous ink containing a mineral acid and having a pH of 1.0 or less; and a step of forming carbon by making use of the mineral acid.

Ink jet recording method

To provide an ink jet recording method capable of recording a high-quality image excellent in optical density and water resistance and at the same time, suppressing peeling-off of an image caused by contact heating of a recording medium. The ink jet recording method has a step of ejecting an aqueous ink containing a resin particle from a line head and applying the aqueous ink to a predetermined position of a recording medium having ink absorbability and a step of bringing a heating roller into contact with the aqueous ink applied to the recording medium to heat it and fixing it at the predetermined position. The dynamic surface tension of the aqueous ink at the time when the heating roller is brought into contact with the aqueous ink applied to the recording medium is higher than the surface tension of the heating roller.

Ink jet recording method of ejecting an aqueous ink having a certain dynamic surface tension

Provided is an aqueous ink that can record an image excellent in color developability and is excellent in sticking recovery property. The aqueous ink for ink jet includes: a pigment; and a surfactant, wherein the pigment includes a self-dispersible pigment in which at least one functional group selected from the group consisting of (i) an anionic group and (ii) a group in which another atomic group and an anionic group are bonded to each other is bonded to a surface of a particle of carbon black and a density of the functional group is 0.10 &#x3bc;mol/mor more to 0.48 &#x3bc;mol/mor less and wherein the surfactant includes an amino acid type surfactant in which a nitrogen atom capable of becoming a cation has a structure of a secondary amine or a tertiary amine.

An ink jet recording method is provided for recording an image by ejecting an ink from a recording head including a member defining an ejection orifice through which the ink is ejected, an ejection element configured to generate an energy used for ejecting the ink, and a first flow path communicating with a portion between the ejection orifice and the ejection element. The method includes ejecting an ink through the ejection orifice, and moving the ink from the first flow path to the portion between the ejection orifice and the ejection element separately from the ejecting of the ink. In this method, the ink is an aqueous ink containing a coloring material and a compound containing a chain hydrocarbon having a carbon number of 8 or more to 18 or less substituted by a hydroxy group or an anionic group.

Ink jet recording method, recording head, and ink jet recording apparatus

A liquid discharge apparatus has a liquid discharge head having a recording element board that includes a plurality of discharge orifices configured to discharge liquid, a plurality of pressure chambers internally provided with a recording element configured to generate energy used to discharge liquid, the plurality of pressure chambers each communicating with the plurality of discharge orifices via discharge channels, a liquid supply channel configured to supply liquid to the plurality of pressure chambers, and a liquid recovery channel configured to recover liquid from the plurality of pressure chambers, and a tank configured to store liquid supplied to the liquid discharge head. The plurality of pressure chambers communicate between the liquid supply channel and the liquid recovery channel so that liquid flows through the plurality of pressure chambers, and the specific permittivity &#x3b5;of the liquid stored in the tank satisfies the relationship of &#x3b5;&#x2266;65.

Liquid discharge apparatus and liquid discharge head

The invention provides an aqueous ink containing a self-dispersible pigment having a carboxylic acid group bonded directly or through another atomic group to a particle surface of a pigment and a lactone group bonded to the particle surface of the pigment, wherein, as determined by a selective neutralization method, an introduced amount of the carboxylic acid group is 0.60 mmol/g or more and a ratio of an introduced amount (mmol/g) of the lactone group to the introduced amount (mmol/g) of the carboxylic acid group is 0.20 time or less.

The present invention preferably provides an ink including an organic pigment, a water-soluble resin and a surfactant that allows images having high color developability to be obtained independently of the type of recording medium, even when a small amount of ink is applied. Preferably, the organic pigment is a phosphonic acid-type self-dispersible pigment, the acid value of the water-soluble resin is 100 mg KOH/g to 160 mg KOH/g, the surfactant is an ethylene oxide adduct of a higher alcohol selected from the group consisting of a linear primary alcohol, a linear secondary alcohol and an isoalkyl alcohol, the HLB value of the surfactant as determined by the Griffin method is 13.0 or more, and the mass ratio of the content (% by mass) of the surfactant in the ink to the content (% by mass) of the water-soluble resin in the ink is 0.07 to 0.70.

Ink, ink cartridge and ink jet recording method

A water-based ink of the present invention includes water, a plurality of different water-soluble organic solvents, and a water-insoluble coloring material, wherein the above water-soluble organic solvents consist of a good solvent to the above water-insoluble coloring material and a poor solvent to the above water-insoluble coloring material, and the total amount (% by mass) of the good solvents in the ink is represented by A and the total amount (% by mass) of the poor solvent in the ink is represented by B, the ratio of A to B ranges from 10:5 to 10:30 both inclusive, and when the respective Ka values of the above water-soluble organic solvents are determined by the Bristow method and compared with each other, a water-soluble organic solvent having the largest Ka value is the poor solvent. The pigment ink has a sufficiently large area factor even with a small amount of ink and provides an image of high OD.

Water-based ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming method

A water-based ink of the present invention includes water, a plurality of different water-soluble organic solvents, and a water-insoluble coloring material, wherein the water-soluble organic solvents consist of a good solvent to the water-insoluble coloring material and a poor solvent to the water-insoluble coloring material, and the total amount (% by mass) of the good solvents in the ink is represented by A and the total amount (% by mass) of the poor solvent in the ink is represented by B, the ratio of A to B ranges from 10:5 to 10:30 both inclusive, and when the respective Ka values of the above water-soluble organic solvents are determined by the Bristow method and compared with each other, a water-soluble organic solvent having the largest Ka value is the poor solvent. The pigment ink has a sufficiently large area factor even with a small amount of ink.

A set of an ink containing a self-dispersible pigment and a water-soluble resin, which is a copolymer having a unit derived from (meth)acrylic acid, and a reaction liquid containing a surfactant, which is an ethylene oxide adduct of a higher alcohol of a linear primary or secondary alcohol or an isoalkyl alcohol and has a HLB value of 13.0 or more determined by the Griffin method, and having buffering ability in an acid region. Content of the surfactant in the reaction liquid is 0.20 times or more in terms of mass ratio as much as total content of the pigment and water-soluble resin.

Set of ink and reaction liquid, and image forming method

A water-based ink of the present invention includes water, a plurality of different water-soluble organic solvents, and a water-insoluble coloring material, wherein the above water-soluble organic solvents consist of a good solvent to the above water-insoluble coloring material and a poor solvent to the above water-insoluble coloring material, and the total amount (% by mass) of the good solvents in the ink is represented by A and the total amount (% by mass) of the poor solvent in the ink is represented by B, the ratio of A to B ranges from 10:5 to 7:9 both inclusive, and when the respective Ka values of the above water-soluble organic solvents are determined by the Bristow method and compared with each other, a water-soluble organic solvent having the largest Ka value is the poor solvent. The pigment ink has a sufficiently large area factor even with a small amount of ink and provides an image of high OD.

Water-based ink, ink jet recording method, ink cartridge, recording unit, ink jet apparatus, and image forming method

Provided is a set of a reaction liquid that has a buffering action against pH change and exhibits a pH of 3.5 or more and 5.5 or less, and an ink that has a higher pH than the reaction liquid. The ink comprises a pigment to a surface of a pigment particle of which a basic group that forms a cation form at the pH of the reaction liquid is bonded. The pigment does not have an acidic group having a pKa equal to or less than the pH of the reaction liquid. The pigment is dispersed by a water-soluble polymer that has an acidic group having a pKa equal to or more than the pH of the reaction liquid and equal to or less than the pH of the ink.

Set of reaction liquid and ink, and image forming method

An aqueous ink to be used together with a pigment ink containing a pigment and a polymer, wherein the aqueous ink contains a reactive component for destabilizing the dispersion state of the pigment, the dynamic surface tension of the aqueous ink at a lifetime of 30 milliseconds is 41 mN/m or more, and the dynamic surface tension of the aqueous ink at a lifetime of 500 milliseconds is from 28 mN/m or more to 38 mN/m or less as determined by a maximum bubble pressure method.

Aqueous ink, ink set, image forming method and image forming apparatus

A method of a cleaning of an ejection face by supplying a head liquid on the face of an inkjet head provided with ink ejection openings and then by performing a wiping operation. Sufficient cleaning is achieved by appropriately specifying relative relationships among the surface tensions of the face, the ink and the head liquid, and by efficiently and surely removing an ink residue from the face. By supplying the head liquid to the ink residue on the face, both are mixed with each other, and thereby the ink residue is incorporated into the head liquid. In this respect, by using the ink and the head liquid both having a surface tension higher than that of the face, a wetting of a dissolved matter of the ink residue with respect to the face is reduced, and the dissolved matter of the ink residue is smoothly moved by the wiping operation.

Method of cleaning head and inkjet recording apparatus

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Kawasaki, Japan

Mikio Sanada