Patents by Inventor Kojiro Akazaki

Kojiro Akazaki 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: 20210311406
    Abstract: Provided is toner which has good low-temperature fixability, shelf stability and hot offset resistance, and which suppresses a decrease in glossiness of an image. The toner comprising colored resin particles containing a binder resin, a colorant, a softening agent and a charge control agent, and an external additive, wherein a glass transition temperature (Tg) specified from a temperature dependence curve of a loss tangent (tan ?) obtained by dynamic viscoelastic measurement of the toner, is 50° C. or more and less than 90° C.; the loss tangent (tan ?) at the glass transition temperature (Tg) is 1.70 or less; in a temperature range of 90° C. or more and 160° C. or less, a lowest temperature (Ta) with a loss tangent of 1.50 is more than 95° C. and less than 145° C.; and a storage elastic modulus (G?) at the lowest temperature (Ta) is less than 56000 Pa.
    Type: Application
    Filed: October 21, 2019
    Publication date: October 7, 2021
    Applicant: ZEON CORPORATION
    Inventor: Kojiro Akazaki
  • Patent number: 11126101
    Abstract: A yellow toner which provides, even in small amounts, a sharper color and brighter gloss, and higher reflection density than ever before, and which has excellent light resistance.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: September 21, 2021
    Assignee: ZEON CORPORATION
    Inventor: Kojiro Akazaki
  • Patent number: 10955764
    Abstract: A toner which is less likely to cause toner leakage and which is less likely to cause aggregation after being left to stand under a high temperature condition. A toner for developing electrostatic images, comprising colored resin particles comprising a binder resin and a colorant, and an external additive, wherein a conditioned bulk density obtained by a powder flowability analyzing device is from 0.525 g/mL to 0.565 g/mL.
    Type: Grant
    Filed: September 20, 2017
    Date of Patent: March 23, 2021
    Assignee: ZEON CORPORATION
    Inventors: Kojiro Akazaki, Junichi Takashima
  • Publication number: 20200348610
    Abstract: A yellow toner which provides, even in small amounts, a sharper color and brighter gloss, and higher reflection density than ever before, and which has excellent light resistance.
    Type: Application
    Filed: December 21, 2018
    Publication date: November 5, 2020
    Applicant: ZEON CORPORATION
    Inventor: Kojiro Akazaki
  • Publication number: 20190227450
    Abstract: A toner which is less likely to cause toner leakage and which is less likely to cause aggregation after being left to stand under a high temperature condition. A toner for developing electrostatic images, comprising colored resin particles comprising a binder resin and a colorant, and an external additive, wherein a conditioned bulk density obtained by a powder flowability analyzing device is from 0.525 g/mL to 0.565 g/mL.
    Type: Application
    Filed: September 20, 2017
    Publication date: July 25, 2019
    Applicant: ZEON CORPORATION
    Inventors: Kojiro Akazaki, Junichi Takashima