Canon Kabushiki Kaisha

Itaru Tsuji

Shinichi Hakamada

Hiroshi Tomioka

Shinichi Tochihara

Yoichi Takada

Minako Kawabe

Koichi Osumi

Hideki Yamakami

Kousuke Yamasaki

Hiroyuki Takuhara

Yuki Nishino

Takashi Imai

Sadayuki Sugama

Nobuyuki Matsumoto

Katsuhiko Suzuki

Junichi Sakai

Hideki Takayama

Tsuyoshi Kanke

Masashi Tsujimura

Shin-ichi Sato

Fumiaki Fujioka

Yoshio Nakajima

Shinsuke Tsuji

Yuichiro Kanasugi

Yuko Takada

Aki Takano

Shin-Ichi Hakamada

Shin-Ichi Sato

An aqueous ink used in an ink jet recording method that uses thermal energy to eject an ink from a recording head includes a copper phthalocyanine pigment and a urethane resin. The urethane resin has a unit derived from a polyisocyanate, a unit derived from a polyether polyol having no acid group, a unit derived from a polyol having an acid group and a unit derived from a polyamine; in the urethane resin, the proportion of the urethane bond relative to the total amount of the urethane bond and the urea bond derived from the polyamine is 90.0% by mole or more to 99.0% by mole or less; and the urethane resin has a weight-average molecular weight of 20,000 or less and an acid value of 50 mg KOH/g or more to 110 mg KOH/g or less.

Aqueous ink, ink cartridge and ink jet recording method

An image-forming method includes a reaction solution-applying step of applying a reaction solution containing a thickening agent and a colorant-aggregating component aggregating a colorant in ink to an intermediate transfer medium, a first ink-applying step of applying a first ink to the intermediate transfer medium provided with the reaction solution, a second ink-applying step of applying a second ink to the intermediate transfer medium provided with the first ink, and a transfer step of transferring an intermediate image formed on the intermediate transfer medium provided with the second ink to a recording medium. An ink layer formed on the intermediate transfer medium by applying the first ink thereto has a yield value of 0.5 Pa or more.

Image-forming method

An ink jet recording method including recording a secondary color image on a recording medium using a first ink and a second ink, wherein the first ink contains a first self-dispersible pigment having a functional group that contains a phosphonic acid group and is bonded to a particle surface of the pigment, the second ink contains a second self-dispersible pigment having a functional group that contains at least one acidic group of a sulfonic acid group and a carboxylic acid group and is bonded to a particle surface of the pigment. The method includes a step of overlappingly applying the first ink and the second ink in this order to the recording medium. The time difference between applications of the first ink and the second ink to the recording medium is 30 milliseconds or less.

Ink jet recording method

Provided is an aqueous ink with high storage stability and scratch resistance at such a high level that the coloring material of an image is not scraped off even when lightly touched with a sharp product. The aqueous ink includes a water-insoluble coloring material and plural polymers. The plural polymers include a polymer A which relatively contributes to dispersion of the water-insoluble coloring material and a polymer B which does not relatively contribute to the dispersion of the water-insoluble coloring material compared to the polymer A. The polymer A includes a block copolymer having an acid value of 120 mgKOH/g to 180 mgKOH/g and having an ethylene oxide group as a nonionic group. The polymer B has an acid value of 150 mgKOH/g or less and a hydrogen bond parameter (&#x3b4;h) of the polymer obtained by solubility parameters of monomers constituting the polymer of 1.0 cal/cmor more and 3.2 cal/cmor less.

Aqueous ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image

An ink to be used in an ink jet recording method of ejecting an ink from a recording head through action of thermal energy can improve the ink ejection stability and shows a high storage stability and a high color developability. An ink to be used in an ink jet recording method of ejecting an ink from a recording head through action of thermal energy is characterized in that the ink comprises a pigment represented by the general formula (1), a dispersant, a water-soluble organic compound and an aggregation inhibiting substance for inhibiting aggregation after dispersion breakdown of the pigment, and the content (mass %) of the aggregation inhibiting substance with respect to the total mass of ink is 0.4 times or more to less than 1.3 times of the content (mass %) of the pigment with respect to the total mass of ink 

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

An ink to be used in an ink jet recording method of ejecting an ink from a recording head through action of thermal energy can improve the ink ejection stability. An ink to be used in an ink jet recording method of ejecting an ink from a recording head through action of thermal energy is characterized in that the ink comprises a pigment represented by the general formula (1), a dispersant and a water-soluble organic compound, and the pigment substantially shows neither an exothermic peak nor an endothermic peak in the range 25&#xb0; C. or more to 200&#xb0; C. or less of a DSC curve obtained by means of a differential scanning calorimeter (DSC) 

An ink jet recording ink comprising at least a copper phthalocyanine dye represented by the following general formula (1) and a compound represented by the following general formula (2): 

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

An ink comprising yellow colorants and a colorant having a phthalocyanine skeleton, in which the yellow colorants are at least a colorant represented by the following general formula I and C.I. Direct Yellow 132 

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

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Itaru Tsuji