Patents by Inventor Sakyo Yagyu

Sakyo Yagyu 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).

  • Publication number: 20210318633
    Abstract: The present invention provides a toner for electrostatic-image development comprising a color resin particle containing a binder resin, a colorant, a charge control agent, and a release agent, and an additive having a polydiene structure, wherein the additive having the polydiene structure has a solubility in styrene at a temperature of 40° C. of 3 to 40 g/100 g, when a cross section of the color resin particle is observed by a transmission electron microscope (TEM), the number of crystal domains of the release agent having an aspect ratio in a range of 2 to 10 in a field of view of 2 ?m×2 ?m square of the cross section of the color resin particle is 2 to 30.
    Type: Application
    Filed: August 30, 2019
    Publication date: October 14, 2021
    Applicant: ZEON CORPORATION
    Inventor: Sakyo Yagyu
  • Patent number: 10901336
    Abstract: Provided is a positively-chargeable toner for developing electrostatic images excellent in printing durability, charge stability, and conveyance amount stability. The toner comprises colored resin particles comprising a binder resin and a colorant, and an external additive, wherein the external additive comprises spherical silica particles with a number average particle diameter of 70 to 200 nm. wherein the external additive has a particle size distribution in which a percentage of a number of particles having a particle diameter of 50 nm or more is 75% or more, which is calculated based on a SEM image.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: January 26, 2021
    Assignee: ZEON CORPORATION
    Inventors: Sakyo Yagyu, Takeru Chiba
  • Publication number: 20200401060
    Abstract: The toner for developing electrostatic images is less likely to cause toner ejection and is excellent in printing durability. The toner includes colored resin particles and external additives. The external additives includes an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.
    Type: Application
    Filed: September 3, 2020
    Publication date: December 24, 2020
    Applicant: ZEON CORPORATION
    Inventors: Takeru Chiba, Sakyo Yagyu
  • Patent number: 10788767
    Abstract: Provided is a toner for developing electrostatic images which is less likely to cause toner ejection and is excellent in printing durability. The toner comprises colored resin particles and external additives, wherein the external additives comprise an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: September 29, 2020
    Assignee: ZEON CORPORATION
    Inventors: Takeru Chiba, Sakyo Yagyu
  • Publication number: 20200233329
    Abstract: Provided is a positively-chargeable toner for developing electrostatic images excellent in printing durability, charge stability, and conveyance amount stability. The toner comprises colored resin particles comprising a binder resin and a colorant, and an external additive, wherein the external additive comprises spherical silica particles with a number average particle diameter of 70 to 200 nm. wherein the external additive has a particle size distribution in which a percentage of a number of particles having a particle diameter of 50 nm or more is 75% or more, which is calculated based on a SEM image.
    Type: Application
    Filed: February 28, 2018
    Publication date: July 23, 2020
    Applicant: ZEON CORPORATION
    Inventors: Sakyo Yagyu, Takeru Chiba
  • Publication number: 20200233326
    Abstract: Provided is a toner which provides excellent balance between high temperature storage stability and low temperature fixability and which is less likely to cause the bleeding out of a release agent even in a long-term, high-temperature condition. Disclosed is a toner for developing electrostatic images, comprising: colored resin particles comprising a binder resin, a colorant and a release agent, and an external additive, wherein the colored resin particles further comprise a styrene-based thermoplastic elastomer, and wherein a content of a fatty acid ester compound having a number average molecular weight (Mn) of 500 or more and less than 2,000 as the release agent, is from 2 parts by mass to 20 parts by mass with respect to 100 parts by mass of the binder resin.
    Type: Application
    Filed: September 27, 2018
    Publication date: July 23, 2020
    Applicant: ZEON CORPORATION
    Inventor: Sakyo Yagyu
  • Publication number: 20190212667
    Abstract: Provided is a toner for developing electrostatic images which is less likely to cause toner ejection and is excellent in printing durability. The toner comprises colored resin particles and external additives, wherein the external additives comprise an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.
    Type: Application
    Filed: June 26, 2017
    Publication date: July 11, 2019
    Applicant: ZEON CORPORATION
    Inventors: Takeru Chiba, Sakyo Yagyu