Patents by Inventor Takaaki Kotaki
Takaaki Kotaki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7361441Abstract: A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and ranges from 75% to 80% at a wavelength of 600 nm, a cyan toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 30% to 35% at a wavelength of 450 nm and ranges from 35% to 40% at a wavelength of 475 nm, and a magenta toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 5% to 10% at a wavelength of 425 nm and ranges from 65% to 70% at a wavelength of 675 nm. These color toners each contain corresponding pigments in specific combination, and promise color reproduction which can ensure the color tones of process inks.Type: GrantFiled: September 21, 2006Date of Patent: April 22, 2008Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Takaaki Kotaki, Takaaki Kaya, Kazuhiko Hayami, Nozomu Komatsu
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Patent number: 7229727Abstract: A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the. wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and ranges from 75% to 80% at a wavelength of 600 nm, a cyan toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 30% to 35% at a wavelength of 450 nm and ranges from 35% to 40% at a wavelength of 475 nm, and a magenta toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 5% to 10% at a wavelength of 425 nm and ranges from 65% to 70% at a wavelength of 675 nm. These color toners each contain corresponding pigments in specific combination, and promise color reproduction which can ensure the color tones of process inks.Type: GrantFiled: November 23, 2004Date of Patent: June 12, 2007Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Takaaki Kotaki, Takaaki Kaya, Kazuhiko Hayami, Nozomu Komatsu
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Patent number: 7214460Abstract: To provide a yellow toner allowing formation of an image with an excellent transparency for an OHP, an excellent coloring power, and an excellent light resistance. In the yellow toner including at least a yellow pigment containing a monoazo compound represented by the following formula (1), the value of a* is in the range of ?5 to +14 when b* is +80 with respect to a transmission chromaticity of an image formed on a transparency sheet. (wherein X1 to X6 each independently denotes a substituent selected from the group consisting of a hydrogen atom, a C1–3 alkyl group, a C1–3 alkoxyl group, a nitro group, a halogen group, a sulfonic group, a sulfamoyl group, a sulfamoyl group substituted with an aromatic group, a carboxyl group, and a carboxylate; each may bond with another to form a benzene ring or an imidazolone ring.Type: GrantFiled: September 13, 2005Date of Patent: May 8, 2007Assignee: Canon Kabushiki KaishaInventors: Atsushi Ishii, Takaaki Kotaki, Satoshi Matsunaga
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Publication number: 20070031747Abstract: A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and ranges from 75% to 80% at a wavelength of 600 nm, a cyan toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 30% to 35% at a wavelength of 450 nm and ranges from 35% to 40% at a wavelength of 475 nm, and a magenta toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 5% to 10% at a wavelength of 425 nm and ranges from 65% to 70% at a wavelength of 675 nm. These color toners each contain corresponding pigments in specific combination, and promise color reproduction which can ensure the color tones of process inks.Type: ApplicationFiled: September 21, 2006Publication date: February 8, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Takayuki Itakura, Takaaki Kotaki, Takaaki Kaya, Kazuhiko Hayami, Nozomu Komatsu
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Patent number: 7147980Abstract: A toner having toner particles each comprising at least a binder resin, a wax, and a colorant is used in an image forming apparatus which has a fixing means comprising a belt-shaped heating member and a pressurizing member. The binder resin contains a resin formed by a reaction between an epoxy group of a vinyl resin (A) having the epoxy group and a carboxyl group of a resin (B) having at least a polyester unit and the carboxyl group. The toner has a storage elastic modulus at a temperature of 80° C. (G? 80) in the range of 1×105 to 1×108 Pa and has a storage elastic modulus at a temperature of 160° C. (G? 160) in the range of 1×101 to 1×104 Pa.Type: GrantFiled: January 9, 2004Date of Patent: December 12, 2006Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Takaaki Kotaki, Yasuhiro Ichikawa, Takaaki Kaya, Wakashi Iida, Hiroyuki Fujikawa, Kazuhiko Hayami, Nobuyoshi Sugahara, Yojiro Hotta
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Patent number: 7144668Abstract: The present invention provides a toner: comprising a binder resin comprising a polyester unit, a colorant, a releasing agent, and inorganic fine particles; has a weight average particle diameter of 3.0–6.5 ?m; has an average circularity of particles in the toner each having a circle-equivalent diameter of 2 ?m or more of 0.920–0.945; has a BET specific surface area of 2.1–3.5 m2/g; and has a permeability of light of a wavelength of 600 nm in a liquid having dispersed the toner in a 45 vol % methanol aq. of 30–80%. The present invention also provides a two-component developer: comprising the toner and a magnetic carrier comprising magnetic core particles coated by a coating layer; and has a number average particle diameter of 15–80 ?m. Using the toner and the two-component developer enables a high-quality image to be formed at a high speed even in an oilless fixing system.Type: GrantFiled: March 5, 2004Date of Patent: December 5, 2006Assignee: Canon Kabushiki KaishaInventors: Yoshinobu Baba, Yuko Sato, Ryoichi Fujita, Takaaki Kotaki, Nobuyoshi Sugahara, Kazuo Terauchi, Takayuki Itakura
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Patent number: 7138213Abstract: The present invention provides a cyan toner including: one or plural heat-absorption peaks in a temperature range of 30 to 200° C. in a heat-absorption curve obtained by using a differential scanning calorimeter; a maximal value of a maximum heat-absorption peak temperature in the range of 65 to 150° C.; and a reflectance of 45 to 80% at a wavelength of 500 nm, a reflectance of 5 to 30% at a wavelength of 600 nm, and a brightness L* of 45 to 75, when measured in a powder form by spectroscopic analysis. The present invention thus provides a cyan toner capable of forming an image with reduced graininess and roughness from a low-density region to a high-density region and ensured a sufficient fixing temperature region, and a method for forming an image using the cyan toner.Type: GrantFiled: March 5, 2004Date of Patent: November 21, 2006Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Yoshinobu Baba, Yuko Sato, Nobuyoshi Sugahara, Kazuo Terauchi, Takaaki Kotaki, Hirohide Tanikawa
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Patent number: 7056634Abstract: To provide a yellow toner allowing formation of an image with an excellent transparency for an OHP, an excellent coloring power, and an excellent light resistance. In the yellow toner including at least a yellow pigment containing a monoazo compound represented by the following formula (1), the value of a* is in the range of ?5 to +14 when b* is +80 with respect to a transmission chromaticity of an image formed on a transparency sheet. (wherein X1 to X6 each independently denotes a substituent selected from the group consisting of a hydrogen atom, a C1–3 alkyl group, a C1–3 alkoxyl group, a nitro group, a halogen group, a sulfonic group, a sulfamoyl group, a sulfamoyl group substituted with an aromatic group, a carboxyl group, and a carboxylate; each may bond with another to form a benzene ring or an imidazolone ring.Type: GrantFiled: October 9, 2003Date of Patent: June 6, 2006Assignee: Canon Kabushiki KaishaInventors: Atsushi Ishii, Takaaki Kotaki, Satoshi Matsunaga
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Publication number: 20060008726Abstract: To provide a yellow toner allowing formation of an image with an excellent transparency for an OHP, an excellent coloring power, and an excellent light resistance. In the yellow toner including at least a yellow pigment containing a monoazo compound represented by the following formula (1), the value of a* is in the range of ?5 to +14 when b* is +80 with respect to a transmission chromaticity of an image formed on a transparency sheet. (wherein X1 to X6 each independently denotes a substituent selected from the group consisting of a hydrogen atom, a C1-3 alkyl group, a C1-3 alkoxyl group, a nitro group, a halogen group, a sulfonic group, a sulfamoyl group, a sulfamoyl group substituted with an aromatic group, a carboxyl group, and a carboxylate; each may bond with another to form a benzene ring or an imidazolone ring.Type: ApplicationFiled: September 13, 2005Publication date: January 12, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Atsushi Ishii, Takaaki Kotaki, Satoshi Matsunaga
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Patent number: 6905808Abstract: A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and ranges from 75% to 80% at a wavelength of 600 nm, a cyan toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 30% to 35% at a wavelength of 450 nm and ranges from 35% to 40% at a wavelength of 475 nm, and a magenta toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 5% to 10% at a wavelength of 425 nm and ranges from 65% to 70% at a wavelength of 675 nm. These color toners each contain corresponding pigments in specific combination, and promise color reproduction which can ensure the color tones of process inks.Type: GrantFiled: January 17, 2003Date of Patent: June 14, 2005Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Takaaki Kotaki, Takaaki Kaya, Kazuhiko Hayami, Nozomu Komatsu
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Publication number: 20050070631Abstract: A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the. wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and ranges from 75% to 80% at a wavelength of 600 nm, a cyan toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 30% to 35% at a wavelength of 450 nm and ranges from 35% to 40% at a wavelength of 475 nm, and a magenta toner in which, in the like sp.ectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 5% to 10% at a wavelength of 425 nm and ranges from 65% to 70% at a wavelength of 675 nm. These color toners each contain corresponding pigments in specific combination, and promise color reproduction which can ensure the color tones of process inks.Type: ApplicationFiled: November 23, 2004Publication date: March 31, 2005Inventors: Takayuki Itakura, Takaaki Kotaki, Takaaki Kaya, Kazuhiko Hayami, Nozomu Komatsu
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Publication number: 20040209178Abstract: The present invention provides a cyan toner including: one or plural heat-absorption peaks in a temperature range of 30 to 200° C. in a heat-absorption curve obtained by using a differential scanning calorimeter; a maximal value of a maximum heat-absorption peak temperature in the range of 65 to 150° C.; and a reflectance of 45 to 80% at a wavelength of 500 nm, a reflectance of 5 to 30% at a wavelength of 600 nm, and a brightness L* of 45 to 75, when measured in a powder form by spectroscopic analysis. The present invention thus provides a cyan toner capable of forming an image with reduced graininess and roughness from a low-density region to a high-density region and ensured a sufficient fixing temperature region, and a method for forming an image using the cyan toner.Type: ApplicationFiled: March 5, 2004Publication date: October 21, 2004Inventors: Takayuki Itakura, Yoshinobu Baba, Yuko Sato, Nobuyoshi Sugahara, Kazuo Terauchi, Takaaki Kotaki, Hirohide Tanikawa
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Publication number: 20040175643Abstract: The present invention provides a toner: comprising a binder resin comprising a polyester unit, a colorant, a releasing agent, and inorganic fine particles; has a weight average particle diameter of 3.0-6.5 &mgr;m; has an average circularity of particles in the toner each having a circle-equivalent diameter of 2 &mgr;m or more of 0.920-0.945; has a BET specific surface area of 2.1-3.5 m2/g; and has a permeability of light of a wavelength of 600 nm in a liquid having dispersed the toner in a 45 vol % methanol aq. of 30-80%. The present invention also provides a two-component developer: comprising the toner and a magnetic carrier comprising magnetic core particles coated by a coating layer; and has a number average particle diameter of 15-80 &mgr;m. Using the toner and the two-component developer enables a high-quality image to be formed at a high speed even in an oilless fixing system.Type: ApplicationFiled: March 5, 2004Publication date: September 9, 2004Inventors: Yoshinobu Baba, Yuko Sato, Ryoichi Fujita, Takaaki Kotaki, Nobuyoshi Sugahara, Kazuo Terauchi, Takayuki Itakura
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Publication number: 20040161688Abstract: A toner having toner particles each comprising at least a binder resin, a wax, and a colorant is used in an image forming apparatus which has a fixing means comprising a belt-shaped heating member and a pressurizing member. The binder resin contains a resin formed by a reaction between an epoxy group of a vinyl resin (A) having the epoxy group and a carboxyl group of a resin (B) having at least a polyester unit and the carboxyl group. The toner has a storage elastic modulus at a temperature of 80° C. (G′ 80) in the range of 1×105 to 1×108 Pa and has a storage elastic modulus at a temperature of 160° C. (G′ 160) in the range of 1×101 to 1×104 Pa.Type: ApplicationFiled: January 9, 2004Publication date: August 19, 2004Inventors: Takayuki Itakura, Takaaki Kotaki, Yasuhiro Ichikawa, Takaaki Kaya, Wakashi Iida, Hiroyuki Fujikawa, Kazuhiko Hayami, Nobuyoshi Sugahara, Yojiro Hotta
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Publication number: 20040115549Abstract: To provide a yellow toner allowing formation of an image with an excellent transparency for an OHP, an excellent coloring power, and an excellent light resistance. In the yellow toner including at least a yellow pigment containing a monoazo compound represented by the following formula (1), the value of a* is in the range of −5 to +14 when b* is +80 with respect to a transmission chromaticity of an image formed on a transparency sheet.Type: ApplicationFiled: October 9, 2003Publication date: June 17, 2004Inventors: Atsushi Ishii, Takaaki Kotaki, Satoshi Matsunaga
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Patent number: 6751424Abstract: An image-forming method for fixing a toner image onto a recording medium, (i) wherein when a high-gloss recording medium (G0>40) is used, an image is formed at a low-speed mode process speed of from 20 mm/sec. to less than 130 mm/sec. and, where the maximum and minimum gloss values of the fixed image (Gmax1 and Gmin1, respectively), satisfy: Gmax1≦G0+40 and Gmin1≧G0−25; and (ii) wherein when a low-gloss recording medium (0≦G0≦40) is used, an image is formed at a high-speed mode process speed of from 130 mm/sec. to 600 mm/sec. and, where values of the fixed image (Gmax2 and Gmin2, respectively), satisfy: Gmax2≦G0+20 and Gmin2≧G0−15.Type: GrantFiled: December 27, 2002Date of Patent: June 15, 2004Assignee: Canon Kabushiki KaishaInventors: Nozomu Komatsu, Takaaki Kotaki, Makoto Kanbayashi, Takaaki Kaya, Wakashi Iida, Nobuyoshi Sugahara, Takayuki Itakura, Yojiro Hotta
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Patent number: 6664016Abstract: A magenta toner having a storage elastic modulus at 80° C., G′80, from 1×106 dN/m2 to 1×108 dN/m2 and a storage elastic modulus at 120° C. to 180° C., G′120-180, from 2×103 dN/m2 to 1×106 dN/m2, and containing a compound represented by Formulas (1) and (2) and a compound represented by Formula (3): wherein RD2 represents H or OCH3, RD4 represents H or CONH2, RD5 represents H, SO2N(C2H5)2, CONHC6H5, CONH2 or CONHC6H4-(p)CONH2, RK2 represents H, OCH3, CH3 or OC2H5, RK4 represents H, OCH3 or Cl, and RK5 represents H, OCH3, Cl or NO2; wherein RD2 represents H or SO3—, RD4 represents H, Cl or CH3, RD5 represents H, Cl, CH3, C2H5, or SO3—, and M represents Ba, Ca, Sr, Mn or Mg; provided that one of RD2 and RD5 is SO3. wherein RD1 and RD2 each represent H or CH3.Type: GrantFiled: July 10, 2001Date of Patent: December 16, 2003Assignee: Canon Kabushiki KaishaInventors: Makoto Kanbayashi, Takaaki Kotaki, Katsumi Kondo, Yasuhiro Ichikawa, Takaaki Kaya, Wakashi Iida, Takayuki Itakura
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Publication number: 20030207186Abstract: A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and ranges from 75% to 80% at a wavelength of 600 nm, a cyan toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 30% to 35% at a wavelength of 450 nm and ranges from 35% to 40% at a wavelength of 475 nm, and a magenta toner in which, in the like spectral-distribution diagram, the reflectance determined for a toner in a state of powder ranges from 5% to 10% at a wavelength of 425 nm and ranges from 65% to 70% at a wavelength of 675 nm. These color toners each contain corresponding pigments in specific combination, and promise color reproduction which can ensure the color tones of process inks.Type: ApplicationFiled: January 17, 2003Publication date: November 6, 2003Inventors: Takayuki Itakura, Takaaki Kotaki, Takaaki Kaya, Kazuhiko Hayami, Nozomu Komatsu
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Publication number: 20030162118Abstract: In an image-forming method having a fixing step of fixing a toner image onto a recording medium, and having at least a low-speed mode and a high-speed mode so as to be able to form images at different speeds;Type: ApplicationFiled: December 27, 2002Publication date: August 28, 2003Inventors: Nozomu Komatsu, Takaaki Kotaki, Makoto Kanbayashi, Takaaki Kaya, Wakashi Iida, Nobuyoshi Sugahara, Takayuki Itakura, Yojiro Hotta
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Patent number: 6537714Abstract: In a two-component development system containing a toner and a carrier, an a-Si photosensitive member having a diameter of from 20 mm to 80 mm is used, the photosensitive member is electrostatically charged to have a surface potential of from 300 to 450 V (absolute value), and yellow, magenta, cyan and black toners are used each of which have a weight-average particle diameter of from 4.0 &mgr;m to 10.0 &mgr;m, and, under a condition that the carrier of the two-component developer has a 50% average particle diameter of from 10 &mgr;m to 80 &mgr;m and as image density (D0.5) measured usually after the toner is fixed once when the quantity of unfixed toner on a transfer medium, M/S, is 0.5 mg/cm2, have a coloring power of from 1.0 to 1.9, and in which the difference between a maximum value and a minimum value of D0.5 of yellow, magenta, cyan and black colors is form 0 to 0.5. This makes it possible to obtain high-quality images in a high image density and a superior color reproduction.Type: GrantFiled: July 6, 2001Date of Patent: March 25, 2003Assignee: Canon Kabushiki KaishaInventors: Takaaki Kaya, Takaaki Kotaki, Makoto Kanbayashi, Yushi Mikuriya, Katsumi Kondo, Wakashi Iida