Canon Kabushiki Kaisha

Hideki Takayama

Kouhei Nakagawa

Shinichi Hakamada

Masako Udagawa

Shin-ichi Sato

Yuhei Shimizu

Shoji Koike

Yasuhiro Nito

Daiji Okamura

Kumiko Mafune

Hiroshi Kakikawa

Makoto Aoki

Mariko Suzuki

Koromo Shirota

Kunihiko Nakamura

Hirofumi Ichinose

Jun Yoshizawa

Eiichi Nakata

Yoshio Nakajima

Takashi Sawada

Yoichi Takada

Hiroyuki Ogino

Masanori Ito

Hideyuki Takai

Motoo Urawa

Hiroshi Asakawa

Hitoshi Nagashima

Shuichi Okazaki

Muneyoshi Sunada

Takakazu Mizutani

Yuuhei Shimizu

Aki Takano

Hiroshi Tajika

Yoshinori Nakagawa

Takashi Imai

Shinichi Sato

Sadayuki Sugama

Yuji Konno

Nobuyuki Matsumoto

Mikio Sanada

Katsuhiko Suzuki

Tomoki Yamamuro

Junichi Sakai

Kousuke Yamasaki

Yoshihisa Yamashita

Kenji Nishiguchi

Tetsu Iwata

Hinako Iritani

Itaru Tsuji

Shin-Ichi Sato

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

The invention has been made to prevent ink adhesion or an ink discharge failure caused by ink adhesion due to evaporation of volatile components of ink which occurs when the ink receptor of a printhead is exposed to air for a long time. If an inkjet printhead and an ink tank containing ink to be supplied to the printhead are attached to a carriage, the ink supply port of the ink tank is pressed to the ink receptor of the printhead. In this arrangement, the presence/absence of attachment of the ink tank to the carriage is detected. If it is detected that the ink tank is not attached to the carriage, a suction operation for the printhead is performed and controlled to suck out ink from the nozzles of the printhead.

Printing apparatus and control method therefor

An ink contains at least a pigment, wherein the pigment is a solid solution of C.I. Pigment Red 202 and C.I. Pigment Violet 19, and a primary particle diameter D (nm) of the pigment and a 50%-cumulative diameter D(nm) in particle diameter distribution of the pigment satisfy a relation of D&#xd7;0.95&#x2266;(=&#x3c;)D&#x2266;(=&#x3c;)130, and a 90%-cumulative diameter D(nm) in particle diameter distribution of the pigment and the 50%-cumulative diameter D(nm) satisfy a relation of 1.5&#x2266;(=&#x3c;)D/D&#x2266;(=&#x3c;)2.2.

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

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.

Ink, ink cartridge, and ink jet recording method

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 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.

An apparatus is configured to perform recording with at least three types of inks that are similar in color and different in pigment density. The apparatus is capable of operating in a first mode for performing recording on a first recording medium using at least one of a second ink having a pigment density that is lower than that of a first ink and a third ink having a pigment density that is lower than that of the second ink, and in a second mode for performing recording on a second recording medium, which has a lower glossiness than the first recording medium, using at least the first ink.

Inkjet recording apparatus and inkjet recording system

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

To provide an ink set which achieves an improvement in gradation of a monochrome image and the realization of a high black density, and which solves gloss unevenness occurring upon formation of an image by means of at least three kinds of black inks different from one another in carbon black content. Provided is an ink set having at least three kinds of black inks different from one another in carbon black content in which carbon black contents in the at least three kinds of inks establish a specific relationship.

Ink set, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus, and image forming 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 object of the present invention is to provide an ink set which can produce images with color developability undoubtedly higher than images produced by a conventional pigment ink and closer to images produced by silver halide photography or output from a laser printer, in particular, color developability in a red color region, while keeping ink reliability. The ink set comprises at least a first ink and a second ink wherein the first ink has a maximum absorption wavelength in a region of 450 nm or more and less than 500 nm and the second ink has a maximum absorption wavelength in a region of 500 nm or more and 570 nm or less, and the ink set has a B/A ratio of a minimum absorbance B to a maximum absorbance A of 0.7 or more and 1.0 or less among absorbances of the first ink and the second ink in total in a region of 450 nm or more and 570 nm or less.

Ink set, image forming method, ink jet recording method, ink cartridge, and recording unit

The present invention aims to provide an ink which has a sufficiently large area factor even in a small ink droplet quantity and can obtain images having a high image density, and further has a superior storage stability. According to the present invention, a cyan ink is provided which is used in an ink set having four kinds of aqueous inks consisting of a cyan ink, a magenta ink, a yellow ink and a black ink in which each ink comprises at least water, a water-insoluble coloring material, and a plurality of water-soluble organic solvents having a good medium or good mediums for the water-insoluble coloring material and a poor medium or poor mediums for the water-insoluble coloring material, wherein, the ratio B/Ais from 0.5 or more to 3.0 or less, where Adenotes the total content (mass %) of the good medium based on the total mass of the cyan ink and Bdenotes the total content (mass %) of the poor medium based on the total mass of the cyan ink, and a water-soluble organic solvent which shows the maximum Ka value among the respective Ka values of the plurality of water-soluble organic solvents as determined by the Bristow method is the poor medium.

Aqueous ink, ink set, and image-forming method

An aqueous ink to be used in an ink jet recording containing a green pigment having a copper phthalocyanine skeleton, wherein a proportion of the K&#x3b1;-line intensity of a chlorine atom to the K&#x3b1;-line intensity of a bromine atom obtained by subjecting the green pigment to X-ray fluorescence analysis is 3.3 or more to 10.0 or less.

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

Growing community of inventors

Fujisawa, Japan

Hideki Takayama