Canon Kabushiki Kaisha

Shinichi Tochihara

Akira Nagashima

Osamu Nishiwaki

Kazuo Iwata

Kumiko Mafune

Makoto Aoki

Shoji Koike

Shinichi Sato

Hitoshi Sugimoto

Hiroshi Tomioka

Kenji Aono

Masami Ikeda

Hiromichi Noguchi

Yutaka Kurabayashi

Katsuhiko Takahashi

Koromo Shirota

Masashi Ogasawara

Mayumi Yamamoto

Yasuko Tomida

Hiroyuki Takuhara

Seiichiro Karita

Masahiro Haruta

Masahiko Higuma

Nobuyuki Kuwabara

Tadayoshi Inamoto

Masatsune Kobayashi

Minako Kawabe

Koichi Osumi

Hideki Yamakami

Kyoko Fukushima

Itaru Tsuji

Tsutomu Abe

Katsuhiro Shirota

Teruo Arashima

Yuji Kondo

Fumihiro Gotoh

Yoshifumi Hattori

Masato Katayama

Yoshihisa Takizawa

Tokuya Ohta

Tsuyoshi Kanke

Masaya Uetuki

Kiyomi Aono

Masaaki Hiro

Kenichi Moriya

Yuko Nishioka

Takahisa Kawamura

Shohji Koike

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

An ink-jet ink comprises water, a water-soluble coloring material having a molecular weight of 600 or less as a free acid form, at least two kinds of water-soluble organic solvents, and urea or a derivative thereof. The vapor pressures at 25&#xb0; C. of the at least two kinds of water-soluble organic solvents are lower than that of water. The water-soluble organic solvents include a water-soluble organic solvent A and a water-soluble organic solvent B. The solubility of the water-soluble coloring material in the water-soluble organic solvent A is higher than its solubility in water, while its solubility in the water-soluble organic solvent B is equal to or lower than its solubility in water. The difference between the solubilities of the water-soluble coloring material in the water-soluble organic solvent A and in the water-soluble organic solvent B is 10% or more. The ink-jet ink does not cause clogging of an ejection portion nor deposition of a coloring material and is capable of providing good print quality even after leaving a printed image for a long term under high temperature and humidity conditions.

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

Ink-jet recording system and ink-jet recording method

The invention provides an ink set, a process for forming a colored portion and an ink-jet recording apparatus which are used for obtaining higher-quality ink-jet recorded articles. The ink set includes an aqueous ink containing at least an ultrafinely particulate pigment as a coloring material and an aqueous liquid composition containing fine particles, dispersed therein and electrically charged at the surface in a polarity opposite to the ink.

Ink set, process for forming colored portion and ink-jet recording apparatus

An ink set for ink-jet recording that includes a plurality of inks containing coloring materials insoluble in water to form a high quality ink-jet recording image is provided. The water-based ink set for ink-jet recording includes a black ink and a color ink, wherein the black ink contains a carbon black as a coloring material having a volume average particle diameter determined by dynamic light scattering of not less than 50 nm, the color ink contains a pigment as a coloring material having a volume average particle diameter determined by dynamic light scattering of not more than 60 nm, and an accumulative 90% particle diameter of volume particle size distribution of not more than 100 nm, the volume average particle diameter of the carbon black of the black ink is larger than the volume average particle diameter of the pigment of the color ink, and the black ink has a surface tension higher than that of the color ink.

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

Aqueous pigment ink and organic pigment powder are used for ink-jet recording to form high quality images. Organic pigment powder is prepared by finely granulating an organic pigment containing anthraquinone as principal ingredient by means of a vapor phase method to such an extent that the produced powder shows a number average particle diameter of primary particles of 10 to 50 nm. An aqueous ink contains such organic pigment powder.

Aqueous ink, organic pigment powder, ink cartridge, recording unit and ink-jet recording apparatus

An ink set having (i) a black ink having a surface tension of not less than 40 dyne/cm, the black ink including a first dye; and (ii) at least one color ink having a surface tension of not more than 40 dyne/cm, the at least one color ink including a second dye which is rendered insoluble by the first dye when the black ink and the at least one color ink are mixed.

Ink set recording apparatus and method using ink set having a dye that

Provided is an ink-jet color recording process to form color images on a recording medium by an ink-jet system applying a plurality of colored pigment-based inks, wherein each of the colored pigment inks comprises a pigment dispersant, and a pigment dispersant contained in at least one of colored pigment-based inks is different from a pigment dispersant contained in the remaining colored pigment-based inks.

Ink-jet color recording process and ink set therefor

A recording medium is composed of a substrate and an ink receiving layer provided on at least one side of the substrate, wherein the ink receiving layer is composed of a composition or a cured product thereof containing at least (A) a polyvinyl acetal resin having acetal groups, acetyl groups and hydroxyl groups, (B) a monomer having an active energy ray curable ethylenic unsaturated group, and (C) a cationic resin, at a ratio (B)/(A) within the range of 1/100 to 5/1, and a ratio (C)/((A)+(B)) of 0.5/100 to 30/100.

Recording medium, ink-jet recording method and printed product

An ink absorbent member is prepared for holding an ink stored in an ink storing section in an ink jet cartridge. The ink absorbent member contains not more then 0.20% by weight, on the basis of the member, of a fraction of soluble matters in a liquid containing an organic polar solvent incapable of reacting with the ink absorbent member such as monohydric alcohols or alkyl ethers of polyhydric alcohols.

Recording method, recording apparatus for conducting the recording

Disclosed herein is an ink-jet recording method in which at least four inks composed of three color inks of cyan, magenta and yellow colors and a colorless ink containing a penetrant are used to record a color image, wherein the recording is conducted so as to overlap the penetrant-containing colorless ink and the color inks each other in a region along boundary lines to be defined by differences in hue of an image to be formed with the color inks, and to form an image with the color inks alone in other regions than the above region.

Ink-jet recording method

An image forming method that forms an image using an ink and a liquid composition by a process comprising the steps of;

Image forming method employing ink-jet recording system

Disclosed herein is a dye represented by any one of the following general formulae ##STR1## wherein D is a chromophore, R is a bivalent or trivalent linking group, M is a tetravalent linking group, and IM is a secondary or tertiary amine residue substituted by at least one radical selected from the group consisting of alkyl groups, a carboxyl group, salts of the carboxyl group, a sulfonic group, salts of the sulfonic group, a phosphoric group and salts of the phosphoric group, with the proviso that D, R, M and IM have 1 to 12 acid groups in total.

Dye, ink containing the same, and ink-jet recording method and

A recording medium has an ink receiving layer provided on a substrate and containing (A) polyvinyl acetal resin and (B) alumina hydrate at a ratio A/B within the range of 50/1 to 6/4.

Recording medium, image forming method using the same and printed product

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Hadano, Japan

Shinichi Tochihara