Canon Kabushiki Kaisha

Hirofumi Ichinose

Takashi Saito

Tsutomu Murakami

Akio Hasebe

Yukie Ueno

Satoshi Shinkura

Hiroshi Tomioka

Daiji Okamura

Kouhei Nakagawa

Kousuke Yamasaki

Yuuki Nishino

Mitsuru Ishii

Masaya Hisamatsu

Hideki Takayama

Masako Udagawa

Hiromitsu Kishi

Ippei Sawayama

Katsuhiro Shirota

Shinichi Hakamada

Katsuhiko Suzuki

Yoichi Takada

Masashi Tsujimura

Eiichi Nakata

Fumiaki Fujioka

Sayoko Nagashima

Fumihiko Mukae

Takahiro Mori

Hiromichi Noguchi

Yutaka Kurabayashi

Kenji Shinjo

Nobuyuki Matsumoto

Masashi Miyagawa

Rie Takekoshi

Hiroyuki Ogino

Tatsuo Fujisaki

Masako Shimomura

Junichi Sakai

Takumi Kaneko

Tsuyoshi Santo

Yoshifumi Takeyama

Naoki Kushida

Minako Kawabe

Tsuyoshi Santoh

Takeshi Takada

Koji Tsuzuki

Kazuki Narumi

Yoshihisa Yamashita

Kenji Nishiguchi

Yoshio Nakajima

Akihiro Kakinuma

Yumi Kamimura

Sachie Furukawa

Masako Ichioka

Yoko Ichinose

Takafumi Midorikawa

Provided is an ink set enabling the recording of images that have excellent color developability and bronzing resistance and have suppressed a coloring by fringe when a clear ink and a pigment ink are used in combination. An aqueous ink set includes a combination of a first ink containing no coloring material and a second ink containing a coloring material.

Ink set and ink jet recording method

Provided is an ink set enabling the recording of images that have excellent gloss clarity and bronzing resistance and have suppressed an occurrence of fringe unevenness when a clear ink and a pigment ink are used in combination. The aqueous ink set includes a combination of a first ink containing no coloring material and a second ink containing a coloring material.

An ink jet ink containing a pigment and a polyurethane polymer, wherein the polyurethane polymer has units derived from a polyol having no acid group and having the carbon number of 13 or more and 250 or less, a diol having an acid group and having the carbon number of 1 or more and 7 or less, a polyol having a siloxane structure, and a polyisocyanate, and an acid value of the polyurethane polymer is 40.0 mgKOH/g or more and 80.0 mgKOH/g or less.

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

An ink containing a plurality of coloring materials having different hues, wherein the bronze value B, which is calculated from tristimulus values of reflected light, of illumination in the direction of an angle of 45 degrees to a normal to the image, in the direction of specular reflection and tristimulus values of illumination light under the same condition of the illumination by using Formula 1, with respect to a predetermined recorded image recorded by the above-described ink is 2.0 or less.

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

An ink jet ink includes a pigment and a polyurethane polymer having units derived from a polyisocyanate, a polyol, and a diol having an acid group, and in the ink jet ink described above, an acid value of the polyurethane polymer is 20 mgKOH/g or more and 100 mgKOH/g or less, the unit derived from the polyisocyanate includes a unit derived from a compound represented by the following general formula (I), and the proportion of the unit derived from the compound represented by the general formula (I) in the unit derived from the polyisocyanate is 90 percent by mole or less. 

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

An ink jet ink contains a self-dispersing pigment and a polyurethane polymer. The polyurethane polymer has units derived from a polyisocyanate, a polyol having no acid group, and a diol having an acid group. The polyurethane polymer has a cross-linked structure and an acid value of the polyurethane polymer is 60 mgKOH/g or more and 100 mgKOH/g or less.

An ink jet ink including a pigment and an ABC triblock polymer, wherein the above-described ABC triblock polymer is formed from an A block having an aryl group, a B block having a unit represented by the following general formula (1), and a C block having a unit represented by the following general formula (2). 

An ink jet ink contains a pigment and a polyurethane polymer. The polyurethane polymer contains units derived from a polyisocyanate, a polyol, a compound having a carboxy group, and a compound having a sulfo group, and an acid value of the polyurethane polymer is 20 mgKOH/g or more and 100 mgKOH/g or less.

An object of the invention is to provide an ink set which enables to improve image density and scratch resistance of the images recorded using an ink containing a self-dispersion pigment and an ink containing a modified siloxane compound. An ink set to be used for ink jet recording including plural inks having a first ink and a second ink independently, wherein the first ink contains at least a pigment having functional groups on surface of pigment particles and a compound having adsorptivity to the pigment and the functional group density on the surface of the pigment particles is 1.5 &#x3bc;mol/mor more and less than 2.6 &#x3bc;mol/mand the second ink contains at least a pigment and a modified siloxane compound.

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

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

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

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

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

A dispersible colorant is provided which comprises a colorant and a chargeable resin pseudo fine particle of a size smaller than the size of the colorant being fixed or fused to the colorant, wherein the colorant itself has a surface charge. Thereby, it becomes possible to process a surface of the colorant while exploiting both the characteristic of a resin adhered and fixed to the surface of the colorant and the characteristic of the surface of the colorant, so that it is possible to provide a dispersible colorant that has sufficiently high dispersibility and a simple and easy method of producing the colorant, by use of a colorant that is essentially water-insoluble.

Dispersible colorant, method of producing same, aqueous ink using same, ink tank, ink jet recording apparatus, ink jet recording method, and ink jet recorded image

A recording medium comprises a base member mainly made of pulp fibers and an ink receiving layer formed thereon containing an inorganic pigment and a binder. The recording medium shows a pore radius distribution having a peak attributable to pores in the base member and a peak attributable to pores in the ink receiving layer. The peak attributable to pores in the ink receiving layer is located between 8 and 50 nm. The ink receiving layer is formed on the base member by applying a coating formulation containing at least an inorganic pigment and a resin emulsion to the base member at a coating rate between 1 and 10 g/mso that the inorganic pigment and the resin emulsion become weakly agglomerated. The recording medium can be suitably used with an ink-jet recording system.

Recording medium, method of manufacturing the same and image forming method

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Tokyo, Japan

Hirofumi Ichinose