Canon Kabushiki Kaisha

Masashi Tsujimura

Takashi Imai

Takashi Saito

Shinichi Hakamada

Yasuhiro Nito

Yoichi Takada

Shinya Mishina

Katsuhiro Shirota

Masashi Ogasawara

Tetsu Iwata

Sadayuki Sugama

Fumiaki Fujioka

Toshifumi Akasaka

Fumihiko Mukae

Hiromitsu Kishi

Sayoko Nagashima

Yuko Takada

Yutaka Kurabayashi

Kenji Shinjo

Nobuyuki Matsumoto

Masayuki Ikegami

Katsuhiko Suzuki

Hirofumi Ichinose

Junichi Sakai

Koromo Shirota

Mikio Sanada

Satoshi Kudo

Kouhei Nakagawa

Yoshihisa Yamashita

Noriyasu Asaki

Kuniaki Fujimoto

Shuichi Okazaki

Yojiro Kojima

Itaru Tsuji

Sayoko Harigaya

Maiko Yamada

Shuhei Takiguchi

Shin-Ichi Hakamada

An ink jet aqueous ink includes a pigment and a water-soluble organic solvent. The pigment includes a self-dispersible pigment having a carboxylic acid group directly bonded to a particle surface of carbon black having a DBP oil absorption of 120 mL/100 g or more to 150 mL/100 g or less, and has a surface charge amount of 0.20 mmol/g or more to 0.25 mmol/g or less, the water-soluble organic solvent contains a first water-soluble organic solvent having a relative dielectric constant of 28.0 or more at a temperature of 25&#xb0; C., and a ratio of a content of the first water-soluble organic solvent to a total content of the water-soluble organic solvent is 50.0 mass % or more to 60.0 mass % or less.

Aqueous ink, ink cartridge, and ink jet recording method

An ink jet recording method using an ink jet recording apparatus having a first ink storage portion, a second ink storage portion, a tube that supplies an aqueous ink from the first ink storage portion to the second ink storage portion, a mechanism that blocks the tube, and a recording head communicating with the second ink storage portion, the method including ejecting the aqueous ink from the recording head to record an image on a recording medium. The tube has an aeration amount (&#x3bc;L/day) of 10 &#x3bc;L/day or more to 60 &#x3bc;L/day or less at a temperature of 40&#xb0; C. The aqueous ink contains a coloring material and a first water-soluble organic solvent having a dielectric constant of 34.0 or less at a temperature of 25&#xb0; C.

Ink jet recording method and ink jet recording apparatus

An aqueous ink comprising water, a water-soluble organic solvent and at least two pigments. The aqueous ink is used together with a reaction liquid containing a reactive component that reacts with the aqueous ink to cause aggregation or gelation of the aqueous ink. The at least two pigments have a difference in precipitation value to the reaction liquid of 0.2 or less.

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

An ink containing a first coloring material and a second coloring material, the sum total of these contents being 6.0% by mass or less. The first coloring material is a black coloring material exhibiting a difference &#x394;&#x3bb;of 20.0 or more between a maximum absorption wavelength in a 20.0% by mass aqueous solution of 1,2-hexanediol and a maximum absorption wavelength in water, the second coloring material is a specific coloring material exhibiting a difference &#x394;&#x3bb;of 12.0 or less between a maximum absorption wavelength in a 20.0% by mass aqueous solution of 1,2-hexanediol and a maximum absorption wavelength in water, and the sum of the &#x394;&#x3bb;and the &#x394;&#x3bb;is 35.0 or less.

Ink, ink cartridge and ink jet recording method

The invention provides an ink containing a coloring material and a water-soluble organic solvent, wherein the coloring material is a compound represented by the following general formula (1), and the water-soluble organic solvent includes an alkanediol having 4 to 6 carbon atoms: wherein rings A, B, C and D each indicated by a broken line are, independently of one another, a benzene ring or a nitrogen-containing heteroaromatic ring, the number of the nitrogen-containing heteroaromatic ring is more than 0.0 and 3.0 or less, the remainder is the benzene ring, Ris an alkyl group, Ris an alkylene group, X is an anilino group having one or more sulfonic groups, m is more than 0.0 and less than 3.9, n is 0.1 or more and less than 4.0, and the sum of m and n is 1.0 or more and less than 4.0.

The present invention provides an ink jet ink that is capable of recording an image excellent in light resistance and ozone resistance and has excellent intermittent ejection stability. The ink jet ink contains a coloring material and a water-soluble organic solvent. The coloring material contains a compound represented by the following general formula (I), the water-soluble organic solvent contains ethylene urea end an alkanediol having 4 to 6 carbon atoms, and a content A (% by mass) of the coloring material, a content B (% by mass) of the ethylene urea and a content C (% by mass) of the alkanediol having 4 to 6 carbon atoms based on a total mass of the ink satisfy relationships of 0.20&#x2266;B/A&#x2266;10.0 and 0.10&#x2266;C/A&#x2266;10.0. 

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

A liquid composition which can achieve superior scratch resistance of images at such a level that coloring materials are hardly scraped off even when images are scratched with finger nails under application of such strong pressure as to scratch a recording medium at its non-recorded areas. The liquid composition contains at least a modified siloxane compound having specific structure and a polymer whose acid value and hydrogen bond parameter (&#x3b4;h) are specified.

Liquid composition, image forming method, cartridge, recording unit and ink jet recording apparatus

A pigment ink is provided which has good ink reliability and storage stability and can achieve superior scratch resistance of images at such a level that coloring materials are hardly scraped off even when images are scratched with finger nails under application of such strong pressure as to scratch a recording medium at its non-recorded areas. The pigment ink contains a pigment, a modified siloxane compound having a specific structure, and a polymer whose acid value and hydrogen bond parameter (&#x3b4;h) are specified.

Pigment ink, ink jet recording method, ink cartridge, recording unit and ink jet recording apparatus

An aqueous ink to be used in an ink jet recording method that an ink is ejected from a recording head by the action of thermal energy, wherein the ink contains a pigment, a polymer and a water-soluble organic solvent, the hydrophilicity &#x3b4;m of the pigment falls within a range of from 21.5 or more to 23.5 or less, and the content (mass %) of the water-soluble organic solvent is from 5.0 mass % or more to 17.5 mass % or less with respect to the whole mass of the aqueous ink.

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

To suppress curling phenomenon of a recording medium to which a liquid composition is applied while securing ejection stability. A liquid composition for used in an image recording method including the steps of applying an ink containing a colorant in a dissolved state or a dispersed state to a recording medium and applying to the recording medium a liquid composition which destabilizes the dissolved state or the dispersed state of the colorant in the ink by coming into contact with the ink, the liquid composition including at least a polyvalent metal ion, water, and water-soluble organic compounds 1 and 2, in which a content X (mass %) of the water-soluble organic compound 1 in the liquid composition is 15 mass % or more, and the content X (mass %) of the water-soluble organic compound 1 in the liquid composition and a content Y (mass %) of the water-soluble organic compound 2 in the liquid composition satisfy a specific relationship.

Liquid composition, set of liquid composition and ink, ink jet recording apparatus, and image forming method

An aqueous ink, by which stable ink-jet recording can be conducted irrespective of printing environment, a substantially even image having abrasion resistance can be formed, no image soiling is caused even upon double-side printing, and a high-quality image improved in unclearness at a contour portion of the image and free from occurrence of color bleed can be provided, is provided. The aqueous ink is an aqueous ink used in a system that a reaction liquid containing at least a polyvalent metal and an aqueous ink containing at least a pigment dispersion, in which a pigment is dispersed with an anionic polymer dispersant, are used to form an image, wherein the aqueous ink satisfies specific condition.

Aqueous ink, set of reaction liquid and aqueous ink, and image forming method

A reaction solution to be used for image recording with an ink containing a coloring material in a dissolved or dispersed state in order to achieve a high level of image density with stability, wherein the reaction solution contains a polyvalent metal ion and an organic solvent to destabilize the dissolved or dispersed state of the coloring material in the ink in contact with the ink, has a pH of 2 or higher, and has a buffering action for pH, wherein the buffering action means it can maintain pH variation within the range of 0.5 before and after the addition of 1.0 ml of a 0.1 N aqueous lithium hydroxide solution to 50 ml of the reaction solution.

Reaction solution, set of reaction solution and ink, inkjet recording apparatus and image recording method

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 

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Kawasaki, Japan

Masashi Tsujimura