Canon Kabushiki Kaisha

Hiroshi Kakikawa

Takashi Saito

Kouhei Nakagawa

Shuichi Okazaki

Hideki Takayama

Shinichi Hakamada

Hideyuki Takai

Minako Kawabe

Masashi Yamamoto

Masako Udagawa

Kazuya Nushiro

Yuuhei Shimizu

Yuhei Shimizu

Satoshi Takebayashi

Yukako Tamanuki

Takakazu Mizutani

Masayuki Ikegami

Yuko Nishiwaki

Ryuki Nanamiya

Eriko Kawakita

Mutsuki Kusada

Takahiro Tajima

Provided is an ink jet recording method that enables recording of an image with a wide expressible color gamut and high fluorescence intensity. The ink jet recording method comprises a step of recording an image by applying first and second inks to a recording medium by using an ink jet recording apparatus, including a recording head having ejection orifices configured to eject the first and second inks, respectively, such that an area where the first ink is applied and an area where the second ink is applied at least partially overlap each other. The first ink contains an alkaline buffer and a pigment particle dispersed by an effect of an anionic group, the second ink contains a fluorescent particle dispersed by an effect of an anionic group, and a density ρ(g/cm) of the pigment particle is more than a density ρ(g/cm) of the fluorescent particle.

Ink jet recording method and ink jet recording apparatus

Provided is an ink jet recording method by which even when an ink jet recording apparatus having a small size and high durability is used, excellent sticking recoverability is obtained and a high-quality image suppressed from causing unevenness can be recorded. The ink jet recording method includes recording an image with an ink jet recording apparatus including: a plurality of aqueous inks; a first ink storage portion; a second ink storage portion; a plurality of tubes; a recording head; and a recovery mechanism. The ratio (&#x3b7;/&#x3b7;) of the viscosity &#x3b7;(mPa&#xb7;s) of the second ink to the viscosity &#x3b7;(mPa&#xb7;s) of the first ink is 0.7 or more to 1.5 or less, and the first ink contains a first water-soluble organic solvent having a specific dielectric constant of 40.0 or more.

An inkjet printing method for printing an image by using a cyan ink, a magenta ink, and a blue ink, including the step of applying the blue ink to a region provided with both the cyan ink and the magenta ink.

Inkjet printing method and inkjet printing apparatus

An aqueous ink for ink jet including a pigment; a water-soluble acrylic resin for dispersing the pigment; a water-soluble urethane resin; and a nonionic fluorinated surfactant. The water-soluble acrylic resin includes a copolymer having two or more units derived from two or more kinds of monomers, and of the two or more units, a unit derived from a monomer that gives a homopolymer having a glass transition temperature Tg of 0&#xb0; C. or more is contained in a proportion of 95.0% by mass or more. The water-soluble urethane resin has a weight-average molecular weight of 6,000 or more.

Aqueous ink, ink cartridge, and ink jet recording method

An aqueous ink for ink jet having a high color developing property, capable of recording an image having an excellent hue, and having excellent storage stability, containing a coloring material and a water-soluble organic solvent is provided. The coloring material is a compound represented by the following General Formula (1). The water-soluble organic solvent contains a first water-soluble organic solvent having two or more hydroxy groups and having a Log P value of &#x2212;1.88 or more to &#x2212;1.09 or less. The content (mass %) of the first water-soluble organic solvent is 5.0 times or more to 30.0 times or less by a mass ratio with respect the content (mass %) of the coloring material. 

An aqueous ink for use in an ink jet recording method in which ink is thermally ejected from a recording head to record an image on a recording medium. The aqueous ink includes zirconium oxide; a pigment; a resin dispersant for the pigment; and a first and a second urethane resin. The content (ppm) of the zirconium oxide in terms of zirconium is 0.5-20.0 ppm based on the total mass of the ink. The pigment is at least one of phthalocyanine, quinacridone, diketopyrrolopyrrole, dioxazine, perinone, perylene and anthraquinone pigments. Each of the first and second urethane resins has a unit derived from a polyether polyol. The ratio of the weight-average molecular weight Mwof the first urethane resin to the weight-average molecular weight Mwof the second urethane resin is 0.20-0.80 times. The second urethane resin has a weight-average molecular weight Mwof 20,000-70,000.

An ink jet aqueous ink including a pigment; a resin dispersant; a fluorinated surfactant; and a water-soluble organic solvent. The pigment comprises quinacridone pigments comprising C.I. Pigment Violet 19, Red 122, 202 or 209; solid solution pigments of two or more thereof; diketopyrrolopyrrole pigments comprising C.I. Pigment Red 254, 255 or 272; or C.I. Pigment Violet 23. The dispersant has an acid value of 150-200 mg KOH/g. The surfactant comprise a perfluoroalkyl ethylene oxide adduct having a C6 or lower perfluoroalkyl group. The solvent contains a water-soluble organic solvent A and B having a dielectric constant of 40.0 or more and 3.0-20.0, respectively. Content p of the pigment is 5.00 mass % or less. Content a of solvent A to content p is 2.0 or more. Content b of solvent B to content a is 0.6 or less. Content b to content f of the surfactant is 10.0 or more.

An aqueous ink for ink jet including a pigment; a water-soluble resin for dispersing the pigment; a water-soluble organic solvent; an acetyleneglycol type surfactant; and a fluorinated surfactant. The acetyleneglycol type surfactant includes an acetyleneglycol ethylene oxide adduct having an HLB value determined by Griffin's method of 10 or more. The fluorinated surfactant includes a perfluoroalkyl ethylene oxide adduct having a perfluoroalkyl group with six or less carbon atoms. The water-soluble organic solvent has a dielectric constant at 25&#xb0; C. of 20.0-30.0. The content of the water-soluble organic solvent relative to the content of the fluorinated surfactant based on the total mass of the ink is 100-200 times in terms of mass ratio. The aqueous ink has a dynamic surface tension &#x3b3;at a lifetime of 10 ms of 40 mN/m or less and a static surface tension &#x3b3; of 25 mN/m or more.

The present invention relates to an ink set enabling the recording of images that have excellent gloss clarity and abrasion resistance even when a plurality of inks are used in combination, and an ink jet recording method using the ink set.

Ink set and ink jet recording method

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.

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 contains at least a pigment, wherein the pigment is C.I. Pigment Red 282, and a primary particle diameter D (nm) of the pigment and a 50%-cumulative diameter D50 (nm) in particle diameter distribution of the pigment satisfy a relation of D&#xd7;0.95&#x2266;D50&#x2266;150, and a 90%-cumulative diameter D90 (nm) in particle diameter distribution of the pigment and the 50%-cumulative diameter D50 (nm) satisfy a relation of 1.5&#x2266;D90/D50&#x2266;2.5.

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Fujisawa, Japan

Hiroshi Kakikawa