Patents by Inventor Motoko Sakai

Motoko Sakai 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: 11506989
    Abstract: An electrostatic charge image developing toner includes toner particles having an average circularity of 0.96 to 1.00 and organic particles having an aspect ratio of 0.4 to 0.9 as an external additive.
    Type: Grant
    Filed: May 13, 2020
    Date of Patent: November 22, 2022
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Kotaro Yoshihara, Asafumi Fujita, Narumasa Sato, Teppei Yawada, Motoko Sakai
  • Patent number: 11156934
    Abstract: A carrier for developing an electrostatic charge image has magnetic particles and a resin coating that covers the magnetic particles and contains at least one lubricant. The resin coating has a dispersed phase of the lubricant and meets requirement (1). Requirement (1): the lubricant content in a top layer>the lubricant content in a middle layer>the lubricant content in a bottom layer The top, middle, and bottom layers are of the resin coating divided into three in the direction of thickness, and the lubricant content is the percentage area of the dispersed phase of the lubricant in a cross-section of the layer taken along the thickness thereof.
    Type: Grant
    Filed: July 31, 2020
    Date of Patent: October 26, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Kotaro Yoshihara, Asafumi Fujita, Teppei Yawada, Motoko Sakai
  • Publication number: 20210286284
    Abstract: A carrier for developing an electrostatic charge image has magnetic particles and a resin coating that covers the magnetic particles and contains at least one lubricant. The resin coating has a dispersed phase of the lubricant and meets requirement (1). Requirement (1): the lubricant content in a top layer>the lubricant content in a middle layer>the lubricant content in a bottom layer The top, middle, and bottom layers are of the resin coating divided into three in the direction of thickness, and the lubricant content is the percentage area of the dispersed phase of the lubricant in a cross-section of the layer taken along the thickness thereof.
    Type: Application
    Filed: July 31, 2020
    Publication date: September 16, 2021
    Applicant: FUJI XEROX Co., Ltd.
    Inventors: Kotaro YOSHIHARA, Asafumi FUJITA, Teppei YAWADA, Motoko SAKAI
  • Publication number: 20210157249
    Abstract: An electrostatic charge image developing toner includes toner particles having an average circularity of 0.96 to 1.00 and organic particles having an aspect ratio of 0.4 to 0.9 as an external additive.
    Type: Application
    Filed: May 13, 2020
    Publication date: May 27, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kotaro YOSHIHARA, Asafumi FUJITA, Narumasa SATO, Teppei YAWADA, Motoko SAKAI
  • Patent number: 10088763
    Abstract: An electrostatic charge image developer includes a brilliant toner that includes a toner particle having an average equivalent circle diameter D longer than an average maximum thickness C and a carrier that includes a core particle and a coating layer which covers a surface of the core particle, wherein the coating layer contains a resin and a surfactant, and a content of the surfactant is in a range of 50 ppm to 200 ppm with respect to the entire weight of the carrier.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: October 2, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Motoko Sakai, Shuji Sato, Shintaro Anno, Takuro Watanabe
  • Patent number: 9891545
    Abstract: An electrostatic charge image developer includes a toner that includes a toner particle; and a carrier, wherein the toner particle contains a brilliant pigment, an exposed amount of the brilliant pigment contained in the toner particle is from 0.5% to 5%, the carrier has a core particle and a coating layer which covers a surface of the core particle, the coating layer contains a silicone resin and a siloxane oligomer, and a content of the siloxane oligomer is from 0.1 ppm to 500 ppm with respect to a total weight of the coating layer.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: February 13, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shintaro Anno, Motoko Sakai, Takuro Watanabe, Shuji Sato
  • Publication number: 20170285504
    Abstract: An electrostatic charge image developer includes a toner that includes a toner particle; and a carrier, wherein the toner particle contains a brilliant pigment, an exposed amount of the brilliant pigment contained in the toner particle is from 0.5% to 5%, the carrier has a core particle and a coating layer which covers a surface of the core particle, the coating layer contains a silicone resin and a siloxane oligomer, and a content of the siloxane oligomer is from 0.1 ppm to 500 ppm with respect to a total weight of the coating layer.
    Type: Application
    Filed: July 29, 2016
    Publication date: October 5, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shintaro ANNO, Motoko SAKAI, Takuro WATANABE, Shuji SATO
  • Publication number: 20170255116
    Abstract: An electrostatic charge image developer includes a brilliant toner that includes a toner particle having an average equivalent circle diameter D longer than an average maximum thickness C and a carrier that includes a core particle and a coating layer which covers a surface of the core particle, wherein the coating layer contains a resin and a surfactant, and a content of the surfactant is in a range of 50 ppm to 200 ppm with respect to the entire weight of the carrier.
    Type: Application
    Filed: July 22, 2016
    Publication date: September 7, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Motoko SAKAI, Shuji SATO, Shintaro ANNO, Takuro WATANABE
  • Patent number: 9639014
    Abstract: An electrostatic charge image developer includes an electrostatic charge image developing carrier containing a ferrite particle and an electrostatic charge image developing toner containing metallic particles whose resistance is from 1010 ?cm to 1013 ?cm in an electric field of 10,000 V/cm, wherein the electrostatic charge image developing carrier satisfies the following formula (1): 0.9?RB/RA?1.0 (1), wherein RA represents the resistance of the electrostatic charge image developing carrier in an electric field of 2,400 V/cm, and RB represents the resistance of the electrostatic charge image developing carrier in an electric field of 19,200 V/cm.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: May 2, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yosuke Tsurumi, Motoko Sakai, Takuro Watanabe, Masaaki Usami
  • Publication number: 20170075242
    Abstract: An electrostatic charge image developing toner includes toner particles including a binder resin and a metallic pigment and silica particles having an equivalent circle diameter E of greater than 0.10 ?m, wherein a relationship between a number-average maximum thickness C and a number-average equivalent circle diameter D of the toner particles satisfies 0.700<C/D<1.220, a number-average equivalent circle diameter d of the silica particles satisfies 0.10 ?m<d<0.30 ?m, and the content of silica particles, having a ratio F/G of a circumferential length F to a circumference G calculated from the equivalent circle diameter E of 1.10 to 3.00, with respect to the total number of silica particles is 30% by number to 100% by number.
    Type: Application
    Filed: January 28, 2016
    Publication date: March 16, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Motoko SAKAI, Shuji SATO, Masaaki USAMI, Takuro WATANABE
  • Patent number: 9535349
    Abstract: An electrostatic charge image developing toner includes a toner particles containing a binder resin and a metallic pigment and aliphatic acid metal salt particles as an external additive in an amount of from 0.1 parts by weight to 2.0 parts by weight with respect to 100 parts by weight of the toner particles, wherein the toner particles have an average circle equivalent diameter D longer than an average C of a maximum thickness of the toner particles.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: January 3, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Motoko Sakai, Shuji Sato, Yosuke Tsurumi, Masaaki Usami, Takuro Watanabe
  • Publication number: 20160246194
    Abstract: An electrostatic charge image developer includes an electrostatic charge image developing carrier containing a ferrite particle and an electrostatic charge image developing toner containing metallic particles whose resistance is from 1010 ?cm to 1013 ?cm in an electric field of 10,000 V/cm, wherein the electrostatic charge image developing carrier satisfies the following formula (1): 0.9?RB/RA?1.0 (1), wherein RA represents the resistance of the electrostatic charge image developing carrier in an electric field of 2,400 V/cm, and RB represents the resistance of the electrostatic charge image developing carrier in an electric field of 19,200 V/cm.
    Type: Application
    Filed: August 6, 2015
    Publication date: August 25, 2016
    Inventors: Yosuke TSURUMI, Motoko SAKAI, Takuro WATANABE, Masaaki USAMI
  • Publication number: 20160216623
    Abstract: An electrostatic charge image developing toner includes a toner particles containing a binder resin and a metallic pigment and aliphatic acid metal salt particles as an external additive in an amount of from 0.1 parts by weight to 2.0 parts by weight with respect to 100 parts by weight of the toner particles, wherein the toner particles have an average circle equivalent diameter D longer than an average C of a maximum thickness of the toner particles.
    Type: Application
    Filed: July 29, 2015
    Publication date: July 28, 2016
    Inventors: Motoko SAKAI, Shuji SATO, Yosuke TSURUMI, Masaaki USAMI, Takuro WATANABE
  • Patent number: 9389581
    Abstract: A toner for developing an electrostatic image, including: toner particles containing at least a binder resin, a release agent, and a colorant; and an external additive having a volume average particle diameter (d) of from 70 nm to 400 nm, a ratio (d/?) of the volume average particle diameter (d) to a standard deviation (?) of a volumetric basis particle diameter of from 2.0 to 12, and an average circularity of from 0.5 to 0.9.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: July 12, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Katsuyuki Kitajima, Yutaka Saito, Michio Take, Yoshifumi Iida, Motoko Sakai
  • Patent number: 9207551
    Abstract: A brilliant toner includes flake shape toner particles containing a binder resin and a flake shape metallic pigment. The brilliant toner further includes tabular particles containing a Ti element.
    Type: Grant
    Filed: August 19, 2014
    Date of Patent: December 8, 2015
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Motoko Sakai, Akihiro Iizuka, Mona Tasaki
  • Publication number: 20150268570
    Abstract: A brilliant toner includes flake shape toner particles containing a binder resin and a flake shape metallic pigment. The brilliant toner further includes tabular particles containing a Ti element.
    Type: Application
    Filed: August 19, 2014
    Publication date: September 24, 2015
    Inventors: Motoko SAKAI, Akihiro IIZUKA, Mona TASAKI
  • Patent number: 8942587
    Abstract: An electrostatic image developer includes a toner containing an external additive having a volume-average particle size of about 80 to 400 nm and an average circularity of about 0.7 to 0.85. The developer is used in an image forming apparatus including an image-carrying member having a top surface layer containing fluorocarbon resin particles, and a developer-carrying member that faces the image-carrying member and carries an electrostatic image developer, in which a value obtained by dividing the amount of developer on the developer-carrying member [g/m2] by a shortest distance between the image-carrying member and the developer-carrying member [?m] is about 0.8 to 1.8, and a peripheral velocity ratio of the developer-carrying member to the image-carrying member is about 1.5 to 5.0 or the developer-carrying member moves in a direction opposite to the image-carrying member in a facing portion.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: January 27, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Sakon Takahashi, Akihiro Iizuka, Motoko Sakai, Kunihiko Sato, Kazuhiko Arai, Nobumasa Furuya, Masaaki Takahashi, Daisuke Haruyama, Koji Nishimura
  • Publication number: 20140178100
    Abstract: An electrostatic image developer includes a toner containing an external additive having a volume-average particle size of about 80 to 400 nm and an average circularity of about 0.7 to 0.85. The developer is used in an image forming apparatus including an image-carrying member having a top surface layer containing fluorocarbon resin particles, and a developer-carrying member that faces the image-carrying member and carries an electrostatic image developer, in which a value obtained by dividing the amount of developer on the developer-carrying member [g/m2] by a shortest distance between the image-carrying member and the developer-carrying member [?m] is about 0.8 to 1.8, and a peripheral velocity ratio of the developer-carrying member to the image-carrying member is about 1.5 to 5.0 or the developer-carrying member moves in a direction opposite to the image-carrying member in a facing portion.
    Type: Application
    Filed: June 7, 2013
    Publication date: June 26, 2014
    Inventors: Sakon TAKAHASHI, Akihiro IIZUKA, Motoko SAKAI, Kunihiko SATO, Kazuhiko ARAI, Nobumasa FURUYA, Masaaki TAKAHASHI, Daisuke HARUYAMA, Koji NISHIMURA
  • Patent number: 8685608
    Abstract: A two-component developer includes: a toner; a carrier having a surface energy of from about 23 dyne/cm to about 37 dyne/cm; and an external additive having a shape factor SF1 of from about 130 to about 150 and a number-average particle diameter of from about 80 nm to about 1 ?m; and an existence ratio A of the external additive on a surface of the toner and an existence ratio B of the external additive on a surface of the carrier satisfying the relationship of the following Expression 1: 0.04?B/A?0.4.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: April 1, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Sakon Takahashi, Motoko Sakai, Yutaka Saito, Katsuyuki Kitajima
  • Patent number: RE45970
    Abstract: The invention provides a toner for electrostatic image development, containing a toner particle and external additive particles adhered to the surface of the toner particle, each of the external additive particles being constituted of plural irreversibly coalesced primary particles.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: April 12, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Tetsuya Taguchi, Motoko Sakai, Jun Igarashi, Masahiro Takagi