Canon Kabushiki Kaisha

Yuko Takada

Shinichi Hakamada

Yoichi Takada

Masashi Tsujimura

Hisashi Teraoka

Shinichi Sato

Sadayuki Sugama

Katsuhiro Shirota

Nobuyuki Matsumoto

Mikio Sanada

Shinya Mishina

Yoshihisa Takizawa

Yuko Sato

Kumiko Mafune

Tsuyoshi Kanke

Koichi Osumi

Fumiaki Fujioka

Tomonari Watanabe

Yoshihide Aikawa

Hiroyuki Takuhara

Noriyasu Asaki

Itaru Tsuji

Maiko Yamada

Sayoko Harigaya

Shin-Ichi Hakamada

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

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 aqueous ink comprises a phthalocyanine dye represented by a general formula (I) and an aqueous medium, wherein the phthalocyanine dye does not contain a component of x+y=2 but at least contains components of x+y=3 and x+y=4, the content of the component of x+y=4 is larger than the content of the component of x+y=3, and the aqueous medium contains an amine compound having a vapor pressure of 0.01 mmHg or higher at 20-25&#xb0; C.:wherein CuPc represents a copper phthalocyanine residue; x represents 1, 2, 3 or 4 and y represent 0, 1, 2 or 3.

Aqueous ink, ink jet recording method, ink tank recording unit and ink jet recording apparatus

The present invention relates to aqueous ink that exhibits characteristics based on cationic self-dispersing carbon black, and that has superior ejection stability even after suspension of printing. The aqueous ink includes cationic self-dispersing pigment, in which at least one cationic group is bound to the surface of the pigment directly or with another atomic group therebetween, a water-soluble organic solvent, and water. In addition to this, the aqueous ink contains an acidic compound including a proton in the structure thereof that can be dissociated due to dissolution into water, and having a dissociation stage of the proton with a dissociation constant of less than 1.

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

An ink set which comprises a black ink containing an aqueous medium and a pigment dispersed in the aqueous medium by an action of an ionic group, and at least two color inks each containing a coloring material and an aqueous medium, wherein (i) respective images formed with the respective color inks have the same &Dgr;E or have the difference in &Dgr;E that is 10 or less in a CIELAB color space display system in a fading test under conditions that cause fading corresponding to pseudo-indoor sunlight fading through a window for 3 years or more, and (ii) at least one of the color inks contains at least one of a coloring material and an additive that destabilize dispersion stability of the pigment in the black ink. The ink set can provide a high quality multicolor image keeping color balance after long preservation and showing less bleeding between black and color regions.

Ink set, ink jet recording method, recording unit, ink cartridge, ink jet recording apparatus, bleed-alleviating method, and method for improving fixability of black image

Ink, ink set, ink-jet recording process, ink cartridge, recording unit and ink-jet recording apparatus

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Kanagawa, Japan

Yuko Takada