Patents by Inventor Yoshimasa FUJIHARA

Yoshimasa FUJIHARA 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: 11550236
    Abstract: A toner for electrostatic image development contains toner particles containing a binder resin. The binder resin includes an amorphous resin and a crystalline resin. In the toner particles, a Net intensity of elemental Mg measured by X-ray fluorescence analysis is from 0.02 to 0.15 inclusive, and a Net intensity of elemental Cl measured by X-ray fluorescence analysis is from 0.02 to 0.60 inclusive.
    Type: Grant
    Filed: January 21, 2021
    Date of Patent: January 10, 2023
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Yoshimasa Fujihara, Atsushi Sugawara, Shintaro Anno, Daisuke Noguchi, Satoshi Miura
  • Patent number: 11550235
    Abstract: An electrostatic image developing toner includes toner particles, an external additive A, and an external additive B. At least the external additive A is deposited on the surfaces of the toner particles. At least the external additive B is deposited on the external additive A. The external additive B includes an aggregate of two or more particles. The coverage of the toner particles with the external additive B is 3% by area or more with respect to the total surface area of the toner particles.
    Type: Grant
    Filed: July 30, 2020
    Date of Patent: January 10, 2023
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Atsushi Sugawara, Yosuke Tsurumi, Yasuko Torii, Yoshimasa Fujihara, Moegi Iguchi
  • Patent number: 11531284
    Abstract: An electrostatic image developing toner includes toner particles including a binder resin and a release agent, an external additive A, and an external additive B. At least the external additive A is present on the surface of the toner particles. At least the external additive B is present on the external additive A. The external additive B is an aggregate of two or more particles. The toner particles have an average circularity of 0.8 or more and 0.94 or less. The amount of the release agent present at the surface of the toner particles is 5 area % or more and 30 area % or less based on the total surface area of the toner particles.
    Type: Grant
    Filed: July 28, 2020
    Date of Patent: December 20, 2022
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Moegi Iguchi, Yosuke Tsurumi, Atsushi Sugawara, Yoshimasa Fujihara, Yasuko Torii
  • Publication number: 20220390867
    Abstract: An electrostatic image developing toner includes a toner particle including a binder resin and a release agent. When a cross section of the toner particle is observed, the toner particle satisfies conditions (A) and (B) below: Condition (A): plural domains of the release agent, the domains having a diameter equal to 10% or more and 35% or less of the maximum diameter of the toner particle, are present in the toner particle; and Condition (B): the average of the distances between the centers of gravity of the domains of the release agent is 35% or more and 60% or less of the maximum diameter of the toner particle.
    Type: Application
    Filed: October 6, 2021
    Publication date: December 8, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Atsushi SUGAWARA, Satoshi MIURA, Daisuke NOGUCHI, Yoshimasa FUJIHARA, Shintaro ANNO
  • Publication number: 20220390865
    Abstract: An electrostatic image developing toner includes a toner particle including a binder resin and a release agent. When a cross section of the toner particle is observed, the toner particle satisfies a condition (A1) below: Condition (A1): the toner particle includes one or more domains of the release agent, the one or more domains having a diameter equal to 8% or more and 30% or less of the maximum diameter of the toner particle, the one or more domains having a geometric center at a depth of R/2 or less below the surface of the toner particle, where R represents the distance between the geometric center of the toner particle and the surface of the toner particle, the one or more domains being entirely included in an inside portion of the toner particle which extends below a depth of 50 nm from the surface of the toner particle.
    Type: Application
    Filed: October 27, 2021
    Publication date: December 8, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Atsushi SUGAWARA, Yoshimasa FUJIHARA, Shintaro ANNO, Satoshi MIURA, Daisuke NOGUCHI
  • Publication number: 20220382176
    Abstract: An electrostatic image developing toner includes a toner particle including an amorphous resin, a crystalline resin, and a release agent. When a cross section of the toner particle is observed, the toner particle satisfies conditions (A1) and (B1) below: Condition (A1): one or more domains of the crystalline resin, the domains having a diameter equal to 10% or more and 40% or less of the maximum diameter of the toner particle, are present in the toner particle, and Condition (B1): one or more domains of the release agent, the domains having a diameter equal to 10% or more and 40% or less of the maximum diameter of the toner particle, are present in the toner particle.
    Type: Application
    Filed: October 8, 2021
    Publication date: December 1, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Atsushi SUGAWARA, Yoshimasa Fujihara, Daisuke Noguchi, Shintaro Anno, Satoshi Miura
  • Publication number: 20220382178
    Abstract: An electrostatic image developing toner includes a toner particle including a binder resin and a colorant. The net intensity NS of sulfur included in the toner particle and the total net intensity NA of an alkali metal and an alkaline-earth metal included in the toner particle, which are measured by X-ray fluorescence analysis, satisfy 1.0<NS/NA<22.0.
    Type: Application
    Filed: October 29, 2021
    Publication date: December 1, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Daisuke NOGUCHI, Yoshimasa FUJIHARA, Atsushi SUGAWARA, Shintaro ANNO, Satoshi MIURA
  • Publication number: 20220382177
    Abstract: An electrostatic charge image developing toner includes a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a pigment having an isoindoline skeleton, in which a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less.
    Type: Application
    Filed: October 13, 2021
    Publication date: December 1, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Satoshi MIURA, Yoshimasa FUJIHARA, Atsushi SUGAWARA, Shintaro ANNO, Daisuke NOGUCHI
  • Publication number: 20220373904
    Abstract: An electrostatic charge image developing toner includes: a toner particle containing a binder resin; and an external additive including a silica particle having a circularity of more than 0.5 and. 0.9 or less and a volume average particle diameter of more than 100 nm and 300 nm or less, in which a total Net intensity NA of an alkali metal element and an alkaline earth metal element in the toner particle measured by fluorescence X-ray analysis is 0.10 kcps or more and 1.20 kcps or less.
    Type: Application
    Filed: August 24, 2021
    Publication date: November 24, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Shintaro ANNO, Yoshimasa FUJIHARA, Atsushi SUGAWARA, Daisuke NOGUCHI, Satoshi MIURA
  • Publication number: 20220373915
    Abstract: An electrostatic charge image developing toner includes: a toner particle containing a binder resin; and an external additive containing alumina particles having a volume average particle diameter of more than 5 nm and 80 nm or less and silica particles having a volume average particle diameter of 10 nm or more and 90 nm or less, and in the toner particle, a Net intensity NA of a total of an alkali metal element and an alkaline earth metal element, measured by fluorescence X-ray analysis, is 0.10 kcps or more and 1.30 kcps or less, and a ratio (Ws/Wa) of a content Ws of the silica particles to a content Wa of the alumina particles is more than 0.5 and less than 35.
    Type: Application
    Filed: August 12, 2021
    Publication date: November 24, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Shintaro ANNO, Yoshimasa FUJIHARA, Atsushi SUGAWARA, Daisuke NOGUCHI, Satoshi MIURA
  • Publication number: 20220299896
    Abstract: A preparing method of an electrostatic charge image developing toner includes: aggregating binder resin particles in a dispersion containing the binder resin particles to form aggregated particles; and coalescing the aggregated particles by heating a dispersion containing the aggregated particles to form toner particles, in which the coalescing includes heating the dispersion containing the aggregated particles to 80° C. or higher so that a temperature of the dispersion containing the aggregated particles reaches 80° C., and then adding an acid and a surfactant to the dispersion containing the aggregated particles.
    Type: Application
    Filed: August 17, 2021
    Publication date: September 22, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Takahiro YAMASHITA, Yoshimasa Fujihara, Daisuke Noguchi, Hiroshi Nakazawa, Yuji Isshiki
  • Publication number: 20220299899
    Abstract: A preparing method of an electrostatic charge image developing toner includes: aggregating binder resin particles in a dispersion containing the binder resin particles to form aggregated particles; and coalescing the aggregated particles by heating a dispersion containing the aggregated particles to form toner particles, in which the aggregating includes adding a divalent or higher valent metal salt compound to the dispersion containing the binder resin particles, and the preparing method satisfies the following Requirement (1), Requirement (1): a ratio M/S of a total metal ion amount M (mol) generated from the divalent or higher valent metal salt compound to a total surface area S (m2) of the binder resin particles at a start of the aggregating is 1.5×1010 or more and 2.5×1013 or less.
    Type: Application
    Filed: August 27, 2021
    Publication date: September 22, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Yoshimasa FUJIHARA, Daisuke NOGUCHI, Kazuhiko NAKAMURA, Hiroshi NAKAZAWA
  • Publication number: 20220299894
    Abstract: A method for producing a toner for electrostatic charge image development includes: aggregating binder resin particles in a dispersion containing the binder resin particles to form aggregated particles; terminating growth of the aggregated particles by adding an alkaline aqueous solution to a dispersion containing the aggregated particles to increase a pH of the dispersion containing the aggregated particles; and fusing and coalescing the aggregated particles into toner particles by heating the dispersion containing the aggregated particles. Terminating the growth of the aggregated particles includes, while stirring the dispersion containing the aggregated particles, stepwise or continuously reducing a stirring power per unit volume.
    Type: Application
    Filed: August 10, 2021
    Publication date: September 22, 2022
    Applicant: FUJIFILM Business Innovation Corp.
    Inventors: Yoshimasa FUJIHARA, Daisuke Noguchi, Kazuhiko Nakamura, Hiroshi Nakazawa, Yuji Isshiki
  • Patent number: 11392052
    Abstract: An electrostatic image developing toner includes a toner particle, an external additive A, and an external additive B. At least the external additive A is present on the surface of the toner particles. At least the external additive B is present on the external additive A. The number of peaks of the external additive B on the external additive A is 5 or more and 100 or less per 30 ?m peripheral length of the toner particle, the peaks having a height from the surface of the toner particle of 80 nm or more and 250 nm or less.
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: July 19, 2022
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Yasuko Torii, Yosuke Tsurumi, Atsushi Sugawara, Yoshimasa Fujihara, Moegi Iguchi
  • Patent number: 11353803
    Abstract: A toner for electrostatic image development includes toner particles containing an amorphous resin and a crystalline resin. The toner particles include first toner particles. When a cross section of each of the first toner particles is observed, at least two domains of the crystalline resin satisfy conditions (A), (B1), (C), and (D) below: condition (A): an aspect ratio of each of the at least two domains of the crystalline resin is from 5 to 40 inclusive; condition (B1): a length of a major axis of each of the at least two domains of the crystalline resin is from 0.5 ?m to 1.
    Type: Grant
    Filed: January 19, 2021
    Date of Patent: June 7, 2022
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Atsushi Sugawara, Shintaro Anno, Yoshimasa Fujihara, Daisuke Noguchi, Satoshi Miura
  • Publication number: 20220091524
    Abstract: An electrostatic image developing toner includes an amorphous polyester resin, a crystalline polyester resin, and C.I. Pigment Red 57:1, wherein a Net intensity NMg of an Mg element, the Net intensity NMg of being determined by X-ray fluorescence analysis, is 0.10 kcps or more and 0.40 kcps or less.
    Type: Application
    Filed: December 31, 2020
    Publication date: March 24, 2022
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Satoshi Miura, Shintaro Anno, Daisuke Noguchi, Yoshimasa Fujihara, Atsushi Sugawara
  • Publication number: 20220091523
    Abstract: A toner for electrostatic image development contains toner particles containing a binder resin. The binder resin includes an amorphous resin and a crystalline resin. In the toner particles, a Net intensity of elemental Mg measured by X-ray fluorescence analysis is from 0.02 to 0.15 inclusive, and a Net intensity of elemental Cl measured by X-ray fluorescence analysis is from 0.02 to 0.60 inclusive.
    Type: Application
    Filed: January 21, 2021
    Publication date: March 24, 2022
    Applicant: FUJI XEROX Co., Ltd.
    Inventors: Yoshimasa FUJIHARA, Atsushi Sugawara, Shintaro Anno, Daisuke Noguchi, Satoshi Miura
  • Publication number: 20220091521
    Abstract: A toner for electrostatic image development includes toner particles containing an amorphous resin and a crystalline resin. The toner particles include first toner particles. When a cross section of each of the first toner particles is observed, at least two domains of the crystalline resin satisfy conditions (A), (B1), (C), and (D) below: condition (A): an aspect ratio of each of the at least two domains of the crystalline resin is from 5 to 40 inclusive; condition (B1): a length of a major axis of each of the at least two domains of the crystalline resin is from 0.5 ?m to 1.
    Type: Application
    Filed: January 19, 2021
    Publication date: March 24, 2022
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Atsushi SUGAWARA, Shintaro ANNO, Yoshimasa FUJIHARA, Daisuke NOGUCHI, Satoshi MIURA
  • Publication number: 20220091527
    Abstract: An electrostatic image developing toner includes an amorphous polyester resin and a crystalline polyester resin, wherein a Net intensity NNa of a Na element and a Net intensity NCl of a Cl element, the Net intensities NNa and NCl being determined by X-ray fluorescence analysis, satisfy 2.5?NCl/NNa?260.0.
    Type: Application
    Filed: January 14, 2021
    Publication date: March 24, 2022
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Daisuke NOGUCHI, Atsushi SUGAWARA, Yoshimasa FUJIHARA, Shintaro ANNO, Satoshi MIURA
  • Publication number: 20220091526
    Abstract: A toner for developing an electrostatic charge image contains toner particles containing at least one binder resin; the Mg element in an amount such that in an x-ray fluorescence analysis of the toner, the net intensity of the peak for the Mg element is 0.10 kcps or more and 1.20 kcps or less; and at least one external additive including particles of at least one compound represented by formula (1), MTiO3??(1) where M represents at least one selected from the group consisting of Ca, Sr, and Ba.
    Type: Application
    Filed: January 12, 2021
    Publication date: March 24, 2022
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shintaro ANNO, Atsushi SUGAWARA, Yoshimasa FUJIHARA, Daisuke NOGUCHI, Satoshi MIURA