Patents by Inventor Katsuhisa Yamazaki

Katsuhisa Yamazaki 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).

  • Patent number: 11112713
    Abstract: A toner including a toner particle containing a binder resin, wherein the binder resin contains a crystalline resin, and in viscoelasticity measurement of the toner with Tp being a peak temperature of an endothermic peak derived from the crystalline resin in DSC of the toner, given G?(Tp?5, 0.01 Hz) as a storage modulus at a temperature of Tp?5° C. and a frequency of 0.01 Hz, G?(Tp?5, 10 Hz) as a storage modulus at a temperature of Tp?5° C. and a frequency of 10 Hz, and G?(Tp?30, 10 Hz) as a storage modulus at a temperature of Tp?30° C. and a frequency of 10 Hz, the following formulae are satisfied: G?(Tp?30,10 Hz)/G?(Tp?5,0.01 Hz)?1.40 G?(Tp?5,10 Hz)/G?(Tp?5,0.01 Hz)?2.20.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: September 7, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hiroki Akiyama, Shuhei Moribe, Hiroyuki Tomono, Tatsuya Saeki, Hiroki Kagawa, Atsuhiko Ohmori, Katsuhisa Yamazaki
  • Patent number: 10942463
    Abstract: A toner including a toner particle containing a polyester resin composition, wherein i) the polyester resin composition contains a specific aliphatic hydrocarbon and a polyester resin having at a terminal a structure derived from at least one of a specific alkyl monoalcohol and a specific alkyl monocarboxylic acid, and ii) the total content of the aliphatic hydrocarbon, the structure derived from the alkyl monoalcohol, and the structure derived from the alkyl monocarboxylic acid is 2.5 to 10.0% by mass, wherein, in the temperature-endothermic quantity curve of the polyester resin composition obtained by DSC, an endothermic peak is present in a specific temperature range and an endothermic quantity for this endothermic peak is 0.10 to 1.90 J/g.
    Type: Grant
    Filed: November 12, 2019
    Date of Patent: March 9, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Yoshiba, Hiroki Akiyama, Koji Nishikawa, Shotaro Nomura, Katsuhisa Yamazaki
  • Publication number: 20200285164
    Abstract: A toner including a toner particle containing a binder resin, wherein the binder resin contains a crystalline resin, and in viscoelasticity measurement of the toner with Tp being a peak temperature of an endothermic peak derived from the crystalline resin in DSC of the toner, given G?(Tp—5, 0.01 Hz) as a storage modulus at a temperature of Tp—5° C. and a frequency of 0.01 Hz, G?(Tp—5, 10 Hz) as a storage modulus at a temperature of Tp—5° C. and a frequency of 10 Hz, and G?(Tp—30, 10 Hz) as a storage modulus at a temperature of Tp—30° C. and a frequency of 10 Hz, the following formulae are satisfied: G?(Tp—30,10 Hz)/G?(Tp—5,0.01 Hz)?1.40 G?(Tp—5,10 Hz)/G?(Tp—5,0.01 Hz)?2.20.
    Type: Application
    Filed: February 27, 2020
    Publication date: September 10, 2020
    Inventors: Hiroki Akiyama, Shuhei Moribe, Hiroyuki Tomono, Tatsuya Saeki, Hiroki Kagawa, Atsuhiko Ohmori, Katsuhisa Yamazaki
  • Patent number: 10768540
    Abstract: Provided is an external additive having a resin particle containing a crystalline resin, and an inorganic fine particle containing a metal atom, the inorganic fine particle being embedded in the resin particle, wherein part of the inorganic fine particle being exposed on a surface of the resin particle, the maximum endothermic peak temperature of the external additive during a first temperature rise is from 50.0° C. to 120° C., the shape factor SF-2 of the external additive is from 110 to 150, and the external additive satisfies following formulae (1) and (2) below, in which Za (mass %) is the percentage content of a metal atom contained in the inorganic fine particle on the surface of the external additive in X-ray photoelectron spectroscopy, and Zb (mass %) is the percentage content of the metal atom in thermogravimetric analysis of the external additive, Za?15??(1), and Za/Zb?0.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: September 8, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuntaro Watanabe, Tatsuya Saeki, Atsuhiko Ohmori, Shuhei Moribe, Hiroki Akiyama, Kazumichi Nakahama, Katsuhisa Yamazaki
  • Patent number: 10747134
    Abstract: An external toner additive having a resin fine particle containing a crystalline resin and an inorganic fine particle embedded in the resin fine particle, wherein part of the inorganic fine particle is exposed on the surface of the resin fine particle, and in differential scanning calorimetry of the external toner additive, the maximum endothermic peak temperature T1 (° C.) during a first temperature increase and the maximum exothermic peak temperature T2 (° C.) during a first temperature decrease satisfy the formulae (1) to (3) below, with measurement performed between ?40° C. and 150° C. at a rate of increase of 10° C./min during the first temperature increase and between 150° C. and ?40° C. at a rate of decrease in temperature of 10° C./min during the first temperature decrease: T1-T2?40.0??(1) 50.0?T1?120.0??(2) 10.0?T2?80.0??(3).
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: August 18, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shuntaro Watanabe, Tatsuya Saeki, Atsuhiko Ohmori, Shuhei Moribe, Hiroki Akiyama, Kazumichi Nakahama, Katsuhisa Yamazaki
  • Publication number: 20200081361
    Abstract: A toner including a toner particle containing a polyester resin composition, wherein i) the polyester resin composition contains a specific aliphatic hydrocarbon and a polyester resin having at a terminal a structure derived from at least one of a specific alkyl monoalcohol and a specific alkyl monocarboxylic acid, and ii) the total content of the aliphatic hydrocarbon, the structure derived from the alkyl monoalcohol, and the structure derived from the alkyl monocarboxylic acid is 2.5 to 10.0% by mass, wherein, in the temperature-endothermic quantity curve of the polyester resin composition obtained by DSC, an endothermic peak is present in a specific temperature range and an endothermic quantity for this endothermic peak is 0.10 to 1.90 J/g.
    Type: Application
    Filed: November 12, 2019
    Publication date: March 12, 2020
    Inventors: Daisuke Yoshiba, Hiroki Akiyama, Koji Nishikawa, Shotaro Nomura, Katsuhisa Yamazaki
  • Publication number: 20190250526
    Abstract: Provided is an external additive having a resin particle containing a crystalline resin, and an inorganic fine particle containing a metal atom, the inorganic fine particle being embedded in the resin particle, wherein part of the inorganic fine particle being exposed on a surface of the resin particle, the maximum endothermic peak temperature of the external additive during a first temperature rise is from 50.0° C. to 120° C., the shape factor SF-2 of the external additive is from 110 to 150, and the external additive satisfies following formulae (1) and (2) below, in which Za (mass%) is the percentage content of a metal atom contained in the inorganic fine particle on the surface of the external additive in X-ray photoelectron spectroscopy, and Zb (mass%) is the percentage content of the metal atom in thermogravimetric analysis of the external additive, Za>15??(1), and Za/Zb?0.
    Type: Application
    Filed: February 11, 2019
    Publication date: August 15, 2019
    Inventors: Shuntaro Watanabe, Tatsuya Saeki, Atsuhiko Ohmori, Shuhei Moribe, Hiroki Akiyama, Kazumichi Nakahama, Katsuhisa Yamazaki
  • Publication number: 20190250528
    Abstract: An external toner additive having a resin fine particle containing a crystalline resin and an inorganic fine particle embedded in the resin fine particle, wherein part of the inorganic fine particle is exposed on the surface of the resin fine particle, and in differential scanning calorimetry of the external toner additive, the maximum endothermic peak temperature T1 (° C.) during a first temperature increase and the maximum exothermic peak temperature T2 (° C.) during a first temperature decrease satisfy the formulae (1) to (3) below, with measurement performed between ?40° C. and 150° C. at a rate of increase of 10° C./min during the first temperature increase and between 150° C. and ?40° C. at a rate of decrease in temperature of 10° C./min during the first temperature decrease: T1-T2?40.0??(1) 50.0?T1?120.0??(2) 10.0?T2?80.0??(3).
    Type: Application
    Filed: January 28, 2019
    Publication date: August 15, 2019
    Inventors: Shuntaro Watanabe, Tatsuya Saeki, Atsuhiko Ohmori, Shuhei Moribe, Hiroki Akiyama, Kazumichi Nakahama, Katsuhisa Yamazaki
  • Patent number: 10295921
    Abstract: A toner comprising a toner particle containing a resin and a colorant, wherein, with respect to a temperature-storage elastic modulus curve obtained by powder dynamic viscoelastic measurement on the toner, (I) the relative minimum values for the variation in the storage elastic modulus E? with respect to temperature T in the temperature range of at least 30° C. and not more than 180° C. have a relative minimum value of equal to or less than ?1.00×107 and the relative minimum value on the lowest temperature side is equal to or less than ?1.00×108; (II) the storage elastic modulus E? (50) of the toner at 50° C. is at least 1.00×109 and not more than 9.00×109; and (III) for a storage elastic modulus E? (120) of the toner at 120° C., E? (50) and E? (120) satisfy 1.50?[E? (50)]/[E? (120)]?3.00.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: May 21, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Atsuhiko Ohmori, Shuhei Moribe, Koji Nishikawa, Kosuke Fukudome, Daisuke Yoshiba, Hiroyuki Tomono, Shotaro Nomura, Sho Kimura, Tatsuya Saeki, Katsuhisa Yamazaki
  • Patent number: 10289016
    Abstract: Provided is a toner having a toner particle including a binder resin and a colorant, wherein the toner has a softening point of at least 100° C. and not more than 150° C., and when Tgt represents a glass transition temperature (° C.) of the toner during a second temperature rise as measured with a DSC, Tgf represents a glass transition temperature (° C.) of a tetrahydrofuran-insoluble matter of the binder resin during a second temperature rise as measured with a DSC, and Tgk represents a glass transition temperature (° C.) of a tetrahydrofuran-soluble matter of the binder resin during a second temperature rise as measured with a DSC, the toner satisfies Tgt>Tgf (1), Tgt>Tgk (2), and 35° C.?Tgf?70° C. (3).
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: May 14, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kosuke Fukudome, Hiroyuki Tomono, Shuhei Moribe, Koji Nishikawa, Daisuke Yoshiba, Shotaro Nomura, Atsuhiko Ohmori, Sho Kimura, Tatsuya Saeki, Katsuhisa Yamazaki
  • Patent number: 10241430
    Abstract: A toner comprising: a toner particle containing a binder resin and a colorant; and an external additive, wherein the external additive is a composite particle having an organic substance and an organosilicon polymer coating layer on the surface of the organic substance, and when a curve for the variation (dE?/dT) in the storage elastic modulus E? of the toner with respect to temperature T [° C.] is obtained on the basis of a curve of the temperature T—the storage elastic modulus E? [Pa] of the toner, as determined by powder dynamic viscoelasticity measurements of the toner, the relative minimum value on the lowest temperature side between the onset temperature and 90° C. is ?1.35×108 or less.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: March 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sho Kimura, Shuhei Moribe, Takashi Matsui, Hiroyuki Tomono, Shotaro Nomura, Atsuhiko Ohmori, Takuya Mizuguchi, Tatsuya Saeki, Katsuhisa Yamazaki
  • Patent number: 10162280
    Abstract: A toner having excellent development performance, low-temperature fixation, and high-temperature storage stability is provided. An external additive contained in this toner is an organic-inorganic composite fine particle containing an inorganic fine particle embedded in a resin fine particle. The resin fine particle is made from a resin having a melting point of 60° C. or more and 150° C. or less.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: December 25, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kouji Nishikawa, Katsuhisa Yamazaki, Daisuke Yoshiba, Shotaro Nomura, Hiroki Akiyama, Masami Fujimoto
  • Publication number: 20180329323
    Abstract: A toner comprising: a toner particle containing a binder resin and a colorant; and an external additive, wherein the external additive is a composite particle having an organic substance and an organosilicon polymer coating layer on the surface of the organic substance, and when a curve for the variation (dE?/dT) in the storage elastic modulus E? of the toner with respect to temperature T [° C.] is obtained on the basis of a curve of the temperature T—the storage elastic modulus E? [Pa] of the toner, as determined by powder dynamic viscoelasticity measurements of the toner, the relative minimum value on the lowest temperature side between the onset temperature and 90° C. is ?1.35×108 or less.
    Type: Application
    Filed: May 2, 2018
    Publication date: November 15, 2018
    Inventors: Sho Kimura, Shuhei Moribe, Takashi Matsui, Hiroyuki Tomono, Shotaro Nomura, Atsuhiko Ohmori, Takuya Mizuguchi, Tatsuya Saeki, Katsuhisa Yamazaki
  • Patent number: 10101683
    Abstract: Provided is a toner, including: a toner particle; and an organic-inorganic composite fine particle on a surface of the toner particle, in which the organic-inorganic composite fine particle includes: a resin fine particle; and an inorganic fine particle embedded in the resin fine particle, and part of which is exposed to a surface of the composite fine particle, and in which the composite fine particle satisfies the following relationships: (i) in viscoelasticity measurement of the composite fine particle, when the loss elastic modulus thereof at a temperature T (° C.) is represented by G?T [dN/m2], a change ratio d(Log(G?T))/dT of a common logarithm of the loss elastic modulus has a minimum in a temperature range of from 60° C. to 150° C., and the minimum is less than ?0.10; and (ii) the loss elastic modulus (G?180) thereof at a temperature of 180° C. is 1.0×104 dN/m2 or more and 1.0×107 dN/m2 or less.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: October 16, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koji Nishikawa, Shuhei Moribe, Daisuke Yoshiba, Shotaro Nomura, Kosuke Fukudome, Hiroki Akiyama, Yojiro Hotta, Katsuhisa Yamazaki
  • Patent number: 10025212
    Abstract: A toner includes toner particles and an external additive; the external additive includes an external additive A containing fine particles of a crystalline resin or fine particles of a wax; the crystalline resin and the wax each have an urethane bond or an urea bond; and the melting point of the crystalline resin and the melting point of the wax are each from 50° C. to 130° C.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: July 17, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji Nishikawa, Shuhei Moribe, Daisuke Yoshiba, Kosuke Fukudome, Shotaro Nomura, Atsuhiko Ohmori, Katsuhisa Yamazaki
  • Publication number: 20180173126
    Abstract: A toner comprising a toner particle containing a resin and a colorant, wherein, with respect to a temperature-storage elastic modulus curve obtained by powder dynamic viscoelastic measurement on the toner, (I) the relative minimum values for the variation in the storage elastic modulus E? with respect to temperature T in the temperature range of at least 30° C. and not more than 180° C. have a relative minimum value of equal to or less than ?1.00×107 and the relative minimum value on the lowest temperature side is equal to or less than ?1.00×108; (II) the storage elastic modulus E? (50) of the toner at 50° C. is at least 1.00×109 and not more than 9.00×109; and (III) for a storage elastic modulus E? (120) of the toner at 120° C., E? (50) and E? (120) satisfy 1.50?[E? (50)]/[E? (120)]?3.00.
    Type: Application
    Filed: December 15, 2017
    Publication date: June 21, 2018
    Inventors: Atsuhiko Ohmori, Shuhei Moribe, Koji Nishikawa, Kosuke Fukudome, Daisuke Yoshiba, Hiroyuki Tomono, Shotaro Nomura, Sho Kimura, Tatsuya Saeki, Katsuhisa Yamazaki
  • Publication number: 20180173125
    Abstract: Provided is a toner having a toner particle including a binder resin and a colorant, wherein the toner has a softening point of at least 100° C. and not more than 150° C., and when Tgt represents a glass transition temperature (° C.) of the toner during a second temperature rise as measured with a DSC, Tgf represents a glass transition temperature (° C.) of a tetrahydrofuran-insoluble matter of the binder resin during a second temperature rise as measured with a DSC, and Tgk represents a glass transition temperature (° C.) of a tetrahydrofuran-soluble matter of the binder resin during a second temperature rise as measured with a DSC, the toner satisfies Tgt>Tgf (1), Tgt>Tgk (2), and 35° C.?Tgf?70° C. (3).
    Type: Application
    Filed: December 13, 2017
    Publication date: June 21, 2018
    Inventors: Kosuke Fukudome, Hiroyuki Tomono, Shuhei Moribe, Koji Nishikawa, Daisuke Yoshiba, Shotaro Nomura, Atsuhiko Ohmori, Sho Kimura, Tatsuya Saeki, Katsuhisa Yamazaki
  • Patent number: 9971263
    Abstract: Provided is a toner having a toner particle that contains a binder resin and a magnetic particle, wherein the magnetic particle satisfies the following stipulations (i) to (iii): (i) the magnetic particle has a prescribed shape and has a protruded portion on a plane portion thereof, (ii) the magnetic particle has a core particle that contains magnetite and has a coating layer, and (iii) the coating layer contains an iron-containing oxide and at least one of a silicon-containing oxide and an aluminum-containing oxide. In a molecular weight distribution measured on the tetrahydrofuran-soluble matter of the toner, the ratio (Mw/Mn) of a weight-average molecular weight to a number-average molecular weight is at least 10.0.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: May 15, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kosuke Fukudome, Shuhei Moribe, Koji Nishikawa, Daisuke Yoshiba, Shotaro Nomura, Atsuhiko Ohmori, Sho Kimura, Katsuhisa Yamazaki
  • Patent number: 9829818
    Abstract: Provided is a toner that uses a crystalline resin, and demonstrates favorable dispersibility of the crystalline resin in the toner, demonstrates superior low-temperature fixability, and is able to inhibit fogging. The toner has a toner particle comprising a resin A, which has a long-chain alkyl group having an average number of carbon atoms of 27 to 50, and a crystalline resin, wherein the SP value (cal/cm3)1/2 of the crystalline resin is 9.00 to 12.00, and in a GC/MS analysis of components that volatize when the toner is heated for 10 minutes at 200° C., the amount of volatile components of saturated hydrocarbons having 30 to 37 carbon atoms is 90 ppm to 260 ppm of toluene equivalent, based on mass.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: November 28, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Yoshiba, Katsuhisa Yamazaki, Koji Nishikawa, Shotaro Nomura, Hiroki Akiyama, Masami Fujimoto
  • Patent number: 9772570
    Abstract: Provided is a toner having good endurance stability and good low-temperature fixability in high-speed printing, and having good resistance to the adhesion of printed paper. The toner is a magnetic toner having, on the surface of toner particle containing a binder resin and an ester compound as a releasing agent, inorganic fine particle “a” and organic-inorganic composite fine particle having a volumetric specific heat of from 2,900 kJ/(m3·° C.) to 4,200 kJ/(m3·° C.), in which a coverage A of the surface of the toner particle with the inorganic fine particle “a” is 45.0% or more and 70.0% or less.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: September 26, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Tsuda, Yojiro Hotta, Koji Nishikawa, Masami Fujimoto, Katsuhisa Yamazaki