Patents by Inventor Tomohito Nakajima

Tomohito Nakajima 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: 11131940
    Abstract: A toner for developing an electrostatic charge image includes a binder resin. In dynamic viscoelasticity measurement, a storage modulus G?50T of the toner at 50° C. is 2×106 Pa or more and 3×108 Pa or less, a storage modulus G?100T of the toner at 100° C. is 1×104 Pa or more and 1×106 Pa or less, and tan ?T of the toner in an entire temperature range of 50° C. or more and 100° C. or less is 0.05 or more and 1.5 or less.
    Type: Grant
    Filed: February 5, 2020
    Date of Patent: September 28, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Shinya Sakamoto, Shinya Nakashima, Masaki Iwase, Tomohiro Shinya, Ryutaro Kembo, Tomohito Nakajima, Naomi Miyamoto
  • Patent number: 10866532
    Abstract: An electrostatic charge image developing toner includes a polar group-containing olefin resin that is a polymer of a composition containing at least one nonpolar monomer unit (X) selected from the group consisting of ethylene and ?-olefin having 3 to 10 carbon atoms, a polar monomer unit (Y) having at least one of a maleic acid group and a maleic anhydride group, and a monomer unit (Z) having a polymerizability to at least one of the nonpolar monomer unit (X) and the polar monomer unit (Y), in which an acid value of the toner is 10 mgKOH/g to 60 mgKOH/g.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: December 15, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Tomohiro Shinya, Naomi Miyamoto, Tomohito Nakajima, Shinya Nakashima, Shinya Sakamoto, Masaki Iwase, Ryutaro Kembo
  • Patent number: 10795274
    Abstract: An electrostatic charge image developing toner includes a continuous phase containing a binder resin (i); and a discontinuous phase that has a core containing a binder resin (ii) and a coating layer covering the core and containing a binder resin (iii), and is dispersed in the continuous phase.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: October 6, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shinya Nakashima, Shinya Sakamoto, Tomohiro Shinya, Naomi Miyamoto, Masaki Iwase, Ryutaro Kembo, Tomohito Nakajima
  • Publication number: 20200310269
    Abstract: An electrostatic charge image developing toner includes a polar group-containing olefin resin that is a polymer of a composition containing at least one nonpolar monomer unit (X) selected from the group consisting of ethylene and ?-olefin having 3 to 10 carbon atoms, a polar monomer unit (Y) having at least one of a maleic acid group and a maleic anhydride group, and a monomer unit (Z) having a polymerizability to at least one of the nonpolar monomer unit (X) and the polar monomer unit (Y), in which an acid value of the toner is 10 mgKOH/g to 60 mgKOH/g.
    Type: Application
    Filed: August 5, 2019
    Publication date: October 1, 2020
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Tomohiro SHINYA, Naomi Miyamoto, Tomohito Nakajima, Shinya Nakashima, Shinya Sakamoto, Masaki Iwase, Ryutaro Kembo
  • Publication number: 20200310270
    Abstract: An electrostatic charge image developing toner includes a continuous phase containing a binder resin (i); and a discontinuous phase that has a core containing a binder resin (ii) and a coating layer covering the core and containing a binder resin (iii), and is dispersed in the continuous phase.
    Type: Application
    Filed: August 5, 2019
    Publication date: October 1, 2020
    Applicant: Fuji Xerox Co., Ltd.
    Inventors: Shinya Nakashima, Shinya Sakamoto, Tomohiro Shinya, Naomi Miyamoto, Masaki Iwase, Ryutaro Kembo, Tomohito Nakajima
  • Publication number: 20200310271
    Abstract: A toner for developing an electrostatic charge image includes a binder resin. In dynamic viscoelasticity measurement, a storage modulus G?50T of the toner at 50° C. is 2×106 Pa or more and 3×108 Pa or less, a storage modulus G?100T of the toner at 100° C. is 1×104 Pa or more and 1×106 Pa or less, and tan ?T of the toner in an entire temperature range of 50° C. or more and 100° C. or less is 0.05 or more and 1.5 or less.
    Type: Application
    Filed: February 5, 2020
    Publication date: October 1, 2020
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shinya SAKAMOTO, Shinya NAKASHIMA, Masaki IWASE, Tomohiro SHINYA, Ryutaro KEMBO, Tomohito NAKAJIMA, Naomi MIYAMOTO
  • Patent number: 10570020
    Abstract: A silica particle has a compression and aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: February 25, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Yasuo Kadokura, Yasuhisa Morooka, Shunsuke Nozaki, Takeshi Iwanaga, Sakae Takeuchi
  • Patent number: 10100176
    Abstract: A resin particle composition includes resin particles, inorganic particles surface-treated with oil, and silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: October 16, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Sakae Takeuchi, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Yasuo Kadokura, Tomohito Nakajima, Takeshi Iwanaga, Shunsuke Nozaki, Yuka Zenitani, Yoshifumi Eri, Yasuhisa Morooka
  • Patent number: 10081718
    Abstract: A resin particle composition includes resin particles, polishing agent particles having an average circle-equivalent diameter of 0.1 ?m to 3.0 ?m, and silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: September 25, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Sakae Takeuchi, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Yasuo Kadokura, Takeshi Iwanaga, Shunsuke Nozaki, Yasuhisa Morooka
  • Patent number: 10061216
    Abstract: An electrostatic image developing toner contains: toner particles, first silica particles having an average equivalent circle diameter of 10 nm to 120 nm and second silica particles having a compressive agglomeration degree of 60% to 95%, a particle compression ratio of 0.20 to 0.40 and an average equivalent circle diameter being greater than the average equivalent circle diameter of the first silica particles.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: August 28, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yuka Zenitani, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
  • Patent number: 9946178
    Abstract: A toner for electrostatic image development includes toner particles; and an external additive containing silica particles and polytetrafluorethylene particles, the silica particles having a compression-aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: April 17, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuo Kadokura, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Yasuhisa Morooka, Shunsuke Nozaki, Takeshi Iwanaga, Sakae Takeuchi
  • Patent number: 9904197
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles having a compression aggregation degree is from 60% to 95% and a particle compression ratio is from 0.20 to 0.40, and resin particles containing a polymer obtained by polymerizing a (meth)acrylic acid ester monomer.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: February 27, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi Eri, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
  • Patent number: 9891543
    Abstract: An electrostatic charge image developing toner includes toner particles and an external additive that includes silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40 and fatty acid metal salt particles.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: February 13, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuo Kadokura, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Yasuhisa Morooka, Shunsuke Nozaki, Takeshi Iwanaga, Sakae Takeuchi
  • Patent number: 9885966
    Abstract: An electrostatic charge image developing toner containing: toner particles; and silica particles having a compaction aggregation degree of from 60% to 95% and a particle compaction ratio of from 0.20 to 0.40, an electrostatic charge image developer containing the electrostatic charge image developing toner, and a toner cartridge that accommodates the electrostatic charge image developing toner and is detachable from an image forming apparatus.
    Type: Grant
    Filed: August 30, 2016
    Date of Patent: February 6, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Tomohito Nakajima, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
  • Patent number: 9864287
    Abstract: An electrostatic charge image developing toner includes kneaded and pulverized toner particles that contain a binder resin and a release agent, the release agent being partially exposed, and an external additive that contains silica particles having a compression aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.
    Type: Grant
    Filed: July 26, 2016
    Date of Patent: January 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi Iida, Hiroyoshi Okuno, Satoshi Inoue, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
  • Patent number: 9835963
    Abstract: A magnetic one-component developer includes magnetic toner particles containing a binder resin and a magnetic powder, and silica particles having a compression and aggregation degree of 60% or more and 95% or less and a particle compression ratio of 0.20 or more and 0.40 or less.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: December 5, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Satoshi Inoue, Hiroyoshi Okuno, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Yasuhisa Morooka, Yasuo Kadokura, Shunsuke Nozaki
  • Patent number: 9835966
    Abstract: An electrostatic charge image developer includes an electrostatic charge image developing toner that includes toner particles, and an external additive which is added to the toner particles and which includes silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40, and a carrier for developing an electrostatic charge image that includes a core particle and a resin coated layer which covers a surface of the core particle and that has a surface roughness Ra (based on JIS-B0601) of 0.5 ?m or less and a circularity of 0.975 or more.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: December 5, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuhisa Morooka, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura
  • Patent number: 9785069
    Abstract: An image forming apparatus includes a developing unit that contains an electrostatic charge image developer and develops an electrostatic charge image formed on the surface of an image holding member as a toner image by using the developer, wherein the developer contains a carrier and an electrostatic charge image developing toner that includes a toner particle and an external additive, the toner particles have an average circularity of from 0.98 to 1.00 and a number-particle diameter distribution index (lower GSD) on a small diameter side of 1.22 or more and contain at least a vinyl resin, and the external additive contains silica particles having a compression aggregation degree of 60% to 95% and a particle compression ratio of 0.20 to 0.40.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: October 10, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi Iida, Hiroyoshi Okuno, Satoshi Inoue, Tomohito Nakajima, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
  • Publication number: 20170227859
    Abstract: An electrostatic charge image developing toner containing: toner particles; and silica particles having a compaction aggregation degree of from 60% to 95% and a particle compaction ratio of from 0.20 to 0.40, an electrostatic charge image developer containing the electrostatic charge image developing toner, and a toner cartridge that accommodates the electrostatic charge image developing toner and is detachable from an image forming apparatus.
    Type: Application
    Filed: August 30, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Tomohito NAKAJIMA, Hiroyoshi OKUNO, Satoshi INOUE, Yoshifumi IIDA, Yuka ZENITANI, Yoshifumi ERI, Takeshi IWANAGA, Sakae TAKEUCHI, Shunsuke NOZAKI, Yasuo KADOKURA, Yasuhisa MOROOKA
  • Publication number: 20170227870
    Abstract: An electrostatic charge lavage developing toner includes kneaded and pulverized toner particles that contain a binder resin and a release agent, the release agent being partially exposed, and an external additive that contains silica particles having a compression aggregation degree of from 60% to 95% and a particle compression ratio of from 0.20 to 0.40.
    Type: Application
    Filed: July 26, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi IIDA, Hiroyoshi OKUNO, Satoshi INOUE, Tomohito NAKAJIMA, Yuka ZENITANI, Yoshifumi ERI, Takeshi IWANAGA, Sakae TAKEUCHI, Shunsuke NOZAKI, Yasuo KADOKURA, Yasuhisa MOROOKA