Patents by Inventor Kazuhiko Hayami
Kazuhiko Hayami 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: 7816063Abstract: The present invention relates to a toner which has good property such as fixability, coloring power, developability, durability, and environmental stability and so on. More specifically, the present invention relates to a color toner containing at least a binder resin, a colorant, and a wax, in which: a wax concentration of an extract obtained by dispersing the toner into n-hexane at a concentration of 15 mg/cm3 at 23° C. and by subjecting the resultant dispersion to extraction treatment at 23° C. for 1 minute is in the range of 0.080 to 0.500 mg/cm3; an average circularity of particles each having a circle-equivalent diameter of 3 ?m or more in the toner is in the range of 0.925 to 0.965; and a content of the wax is in the range of 1 to 15 parts by mass with respect to 100 parts by mass of the binder resin.Type: GrantFiled: February 6, 2009Date of Patent: October 19, 2010Assignee: Canon Kabushiki KaishaInventors: Akira Hashimoto, Yojiro Hotta, Wakashi Iida, Kazuhiko Hayami, Hirohide Tanikawa, Yasuhiro Ichikawa
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Patent number: 7544457Abstract: The present invention relates to a toner which has good property such as fixability, coloring power, developability, durability, and environmental stability and so on. More specifically, the present invention relates to a color toner containing at least a binder resin, a colorant, and a wax, in which: a wax concentration of an extract obtained by dispersing the toner into n-hexane at a concentration of 15 mg/cm3 at 23° C. and by subjecting the resultant dispersion to extraction treatment at 23° C. for 1 minute is in the range of 0.080 to 0.500 mg/cm3; an average circularity of particles each having a circle-equivalent diameter of 3 ?m or more in the toner is in the range of 0.925 to 0.965; and a content of the wax is in the range of 1 to 15 parts by mass with respect to 100 parts by mass of the binder resin.Type: GrantFiled: November 4, 2004Date of Patent: June 9, 2009Assignee: Canon Kabushiki KaishaInventors: Akira Hashimoto, Yojiro Hotta, Wakashi Iida, Kazuhiko Hayami, Yasuhiro Ichikawa, Hirohide Tanikawa
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Publication number: 20090142683Abstract: The present invention relates to a toner which has good property such as fixability, coloring power, developability, durability, and environmental stability and so on. More specifically, the present invention relates to a color toner containing at least a binder resin, a colorant, and a wax, in which: a wax concentration of an extract obtained by dispersing the toner into n-hexane at a concentration of 15 mg/cm3 at 23° C. and by subjecting the resultant dispersion to extraction treatment at 23° C. for 1 minute is in the range of 0.080 to 0.500 mg/cm3; an average circularity of particles each having a circle-equivalent diameter of 3 ?m or more in the toner is in the range of 0.925 to 0.965; and a content of the wax is in the range of 1 to 15 parts by mass with respect to 100 parts by mass of the binder resin.Type: ApplicationFiled: February 6, 2009Publication date: June 4, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Akira Hashimoto, Yojiro Hotta, Wakashi Iida, Kazuhiko Hayami, Yasuhiro Ichikawa, Hirohide Tanikawa
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Patent number: 7455947Abstract: The present invention provides a yellow toner which is excellent in transparency of an image formed on an OHP sheet, excellent in color reproducibility even when a light-pressure fixing unit is employed, excellent in coloring power and charge property, and is reduced in occurrence of filming. The present invention also provides a yellow toner having excellent durability and capable of contributing to the simplification or miniaturization of the constitution of an image forming apparatus. The yellow toner of the invention comprises a binder resin and a colorant, the binder resin contains at least a polyester unit, and the toner in the powder state has a lightness L* satisfying the relationship of L*>87 and has a chromaticity b* satisfying the relationship of 106<b*<120.Type: GrantFiled: May 24, 2007Date of Patent: November 25, 2008Assignee: Canon Kabushiki KaishaInventors: Tetsuya Ida, Yasuhiro Ichikawa, Wakashi Iida, Yojiro Hotta, Kazuhiko Hayami, Hirohide Tanikawa
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Patent number: 7452647Abstract: A color toner that comprises at least a binder resin, a colorant and a release agent, wherein the binder resin has at least a polyester unit and is synthesized in the presence of a tin compound as a catalyst represented by the general formula (1): (RCOO)2Sn??(1) wherein, R is an alkyl group of 5 to 15 carbon atoms. The toner is excellent in charge build-up, resistance to high temperature offset, color reproducibility and transparency.Type: GrantFiled: April 6, 2004Date of Patent: November 18, 2008Assignee: Canon Kabushiki KaishaInventors: Kazuhiko Hayami, Hirohide Tanikawa, Tetsuya Ida, Akira Hashimoto, Nozomu Komatsu, Hiroyuki Fujikawa
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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: 7300733Abstract: To provide a black toner having excellent charging property and transferring property against a severe environmental change. The black toner includes toner particle containing at least a binder resin, carbon black and a releasing agent, wherein: the toner particles have a weight-average particle diameter of 3.5 to 8.0 ?m; total amount of acid value and hydroxyl value of the toner is 30 to 75 mgKOH/g; average circularity of particles contained in the toner having circle-equivalent diameter of 2 ?m or more is 0.915 to 0.960; loss tangent tan? (103 to 104 Hz) of the toner is represented by the following expression: tan? (103 to 104 Hz)?0.0060 where the loss tangent tan? is represented by ??/?? where ?? denotes dielectric loss factor and ?? denotes dielectric constant, and tan? (103 to 104 Hz) denotes the loss tangent in a frequency range of 103 to 104 Hz; and a ratio of tan? (105 Hz) to tan? (5×104 Hz) is represented by the following expression: 1.05?tan? (105 Hz)/tan? (5×104 Hz)?1.Type: GrantFiled: September 14, 2005Date of Patent: November 27, 2007Assignee: Canon Kabushiki KaishaInventors: Nobuyoshi Sugahara, Takaaki Kohtaki, Yasuhiro Ichikawa, Tetsuya Ida, Kazuhiko Hayami, Nozomu Komatsu
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Patent number: 7288348Abstract: In a color toner having toner particles which have toner base particles containing a binder resin, a colorant and a wax, and inorganic fine particles, (i) in the toner base particles, particles having a circle-equivalent diameter of 3.00 ?m or more as measured with a flow type particle image analyzer have an average circularity of from 0.920 or more to less than 0.950, (ii) in the particles having a circle-equivalent diameter of 3.00 ?m or more in the toner base particles, particles having a circularity of 0.960 or more are in a number frequency cumulative value of 40% or less; and (iii) in the particles having a circle-equivalent diameter of 3.00 ?m or more in the toner base particles, particles having a circularity of 0.920 or less are in a number frequency cumulative value of 30% or less. Also disclosed is a full-color image forming method making use of the toner.Type: GrantFiled: September 9, 2004Date of Patent: October 30, 2007Assignee: Canon Kabushiki KaishaInventors: Kazuhiko Hayami, Tetsuya Ida, Nozomu Komatsu, Yasuhiro Ichikawa, Akira Hashimoto, Hirohide Tanikawa, Takakuni Kobori, Takayuki Itakura, Hiroyuki Fujikawa, Koh Ishigami, Nobuyoshi Sugahara
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Publication number: 20070224531Abstract: The present invention provides a yellow toner which is excellent in transparency of an image formed on an OHP sheet, excellent in color reproducibility even when a light-pressure fixing unit is employed, excellent in coloring power and charge property, and is reduced in occurrence of filming. The present invention also provides a yellow toner having excellent durability and capable of contributing to the simplification or miniaturization of the constitution of an image forming apparatus. The yellow toner of the invention comprises a binder resin and a colorant, the binder resin contains at least a polyester unit, and the toner in the powder state has a lightness L* satisfying the relationship of L*>87 and has a chromaticity b* satisfying the relationship of 106<b*<120.Type: ApplicationFiled: May 24, 2007Publication date: September 27, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Tetsuya Ida, Yasuhiro Ichikawa, Wakashi Iida, Yojiro Hotta, Kazuhiko Hayami, Hirohide Tanikawa
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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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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: 7115349Abstract: Provided is toner which is excellent in developing property, transferring property, and fixing property, hardly affected by its surrounding, and has good endurance. The toner has a peak temperature of maximum endothermic peak in the range of 60 to 100° C. in an endothermic curve of differential scanning calorimetry (DSC) measurement; silica particles in the toner contain a titanium element; and the silica particles satisfy the following expressions. 0.7?(Ia1/Ib1)?2.0 0.7?(Ia2/Ib2)?2.0 where Ia1 represents a maximum intensity in the case of 2?=25.3 deg, Ib1 represents a mean intensity in the cases of 2?=25.3 deg+2.0 deg. and of 2?=25.3 deg.?2.0 deg., Ia2 represents a maximum intensity in the case of 2?=27.5 deg and Ib2 represents a mean intensity in the cases of 2?=27.5. deg+2.0 deg. and of 2?=27.5 deg.?2.0 deg.Type: GrantFiled: November 28, 2003Date of Patent: October 3, 2006Assignee: Canon Kabushiki KaishaInventors: Wakashi Iida, Kazuhiko Hayami, Takayuki Itakura, Yojiro Hotta
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Patent number: 7022449Abstract: To provide a black toner having excellent charging property and transferring property against a severe environmental change. The black toner includes toner particle containing at least a binder resin, carbon black and a releasing agent, wherein: the toner particles have a weight-average particle diameter of 3.5 to 8.0 ?m; total amount of acid value and hydroxyl value of the toner is 30 to 75 mgKOH/g; average circularity of particles contained in the toner having circle-equivalent diameter of 2 ?m or more is 0.915 to 0.960; loss tangent tan ? (103 to 104 Hz) of the toner is represented by the following expression: tan ?(103 to 104 Hz)?0.0060 where the loss tangent tan ? is represented by ??/?? where ?? denotes dielectric loss factor and ?? denotes dielectric constant, and tan ? (103 to 104 Hz) denotes the loss tangent in a frequency range of 103 to 104 Hz; and a ratio of tan ? (105 Hz) to tan ? (5×104 Hz) is represented by the following expression: 1.05?tan ?(105 Hz)/tan ?(5×104 Hz)?1.Type: GrantFiled: July 30, 2003Date of Patent: April 4, 2006Assignee: Canon Kabushiki KaishaInventors: Nobuyoshi Sugahara, Takaaki Kohtaki, Yasuhiro Ichikawa, Tetsuya Ida, Kazuhiko Hayami, Nozomu Komatsu
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Publication number: 20060014095Abstract: To provide a black toner having excellent charging property and transferring property against a severe environmental change. The black toner includes toner particle containing at least a binder resin, carbon black and a releasing agent, wherein: the toner particles have a weight-average particle diameter of 3.5 to 8.0 ?m; total amount of acid value and hydroxyl value of the toner is 30 to 75 mgKOH/g; average circularity of particles contained in the toner having circle-equivalent diameter of 2 ?m or more is 0.915 to 0.960; loss tangent tan ? (103 to 104 Hz) of the toner is represented by the following expression: tan ? (103 to 104 Hz)?0.0060 where the loss tangent tan ? is represented by ??/?? where ?? denotes dielectric loss factor and ?? denotes dielectric constant, and tan ? (103 to 104 Hz) denotes the loss tangent in a frequency range of 103 to 104 Hz; and a ratio of tan ? (105 Hz) to tan ? (5×104 Hz) is represented by the following expression: 1.05?tan ? (105 Hz)/tan ? (5×104 Hz)?1.Type: ApplicationFiled: September 14, 2005Publication date: January 19, 2006Applicant: Canon Kabushiki KaishaInventors: Nobuyoshi Sugahara, Takaaki Kohtaki, Yasuhiro Ichikawa, Tetsuya Ida, Kazuhiko Hayami, Nozomu Komatsu
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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: 20050106488Abstract: The present invention provides a yellow toner which is excellent in transparency of an image formed on an OHP sheet, excellent in color reproducibility even when a light-pressure fixing unit is employed, excellent in coloring power and charge property, and is reduced in occurrence of filming. The present invention also provides a yellow toner having excellent durability and capable of contributing to the simplification or miniaturization of the constitution of an image forming apparatus. The yellow toner of the invention comprises a binder resin and a colorant, the binder resin contains at least a polyester unit, and the toner in the powder state has a lightness L* satisfying the relationship of L*>87 and has a chromaticity b* satisfying the relationship of 106<b*<120.Type: ApplicationFiled: November 4, 2004Publication date: May 19, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Tetsuya Ida, Yasuhiro Ichikawa, Wakashi Iida, Yojiro Hotta, Kazuhiko Hayami, Hirohide Tanikawa
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Publication number: 20050100808Abstract: The present invention relates to a toner which has good property such as fixability, coloring power, developability, durability, and environmental stability and so on. More specifically, the present invention relates to a color toner containing at least a binder resin, a colorant, and a wax, in which: a wax concentration of an extract obtained by dispersing the toner into n-hexane at a concentration of 15 mg/cm3 at 23° C. and by subjecting the resultant dispersion to extraction treatment at 23° C. for 1 minute is in the range of 0.080 to 0.500 mg/cm3; an average circularity of particles each having a circle-equivalent diameter of 3 ?m or more in the toner is in the range of 0.925 to 0.965; and a content of the wax is in the range of 1 to 15 parts by mass with respect to 100 parts by mass of the binder resin.Type: ApplicationFiled: November 4, 2004Publication date: May 12, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Akira Hashimoto, Yojiro Hotta, Wakashi Iida, Kazuhiko Hayami, Yasuhiro Ichikawa, Hirohide Tanikawa
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Publication number: 20050079429Abstract: In a color toner having toner particles which have toner base particles containing a binder resin, a colorant and a wax, and inorganic fine particles, (i) in the toner base particles, particles having a circle-equivalent diameter of 3.00 ?m or more as measured with a flow type particle image analyzer have an average circularity of from 0.920 or more to less than 0.950, (ii) in the particles having a circle-equivalent diameter of 3.00 ?m or more in the toner base particles, particles having a circularity of 0.960 or more are in a number frequency cumulative value of 40% or less; and (iii) in the particles having a circle-equivalent diameter of 3.00 ?m or more in the toner base particles, particles having a circularity of 0.920 or less are in a number frequency cumulative value of 30% or less. Also disclosed is a full-color image forming method making use of the toner.Type: ApplicationFiled: September 9, 2004Publication date: April 14, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Kazuhiko Hayami, Tetsuya Ida, Nozomu Komatsu, Yasuhiro Ichikawa, Akira Hashimoto, Hirohide Tanikawa, Takakuni Kobori, Takayuki Itakura, Hiroyuki Fujikawa, Koh Ishigami, Nobuyoshi Sugahara
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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