Patents by Inventor Kana YOSHIDA

Kana YOSHIDA 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: 20180143550
    Abstract: A toner for developing an electrostatic image includes toner particles that each include a binder resin and a release agent. The ratio B/A of a half-width B of an exothermic peak Tc resulting from the release agent which is determined in a first cooling step by differential scanning calorimetry to a half-width A of an endothermic peak Tm resulting from the release agent which is determined in a first heating step prior to the first cooling step by differential scanning calorimetry is 1.5 or more and 4 or less.
    Type: Application
    Filed: August 4, 2017
    Publication date: May 24, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Atsushi SUGAWARA, Kana YOSHIDA, Tsuyoshi MURAKAMI, Masaki IWASE
  • Publication number: 20180113392
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin and a white pigment, wherein, in a particle size distribution of a maximum Feret diameter of particles of the white pigment present in the toner particle, a ratio of particles of the white pigment having a maximum Feret diameter of 200 nm or more and less than 400 nm is 50% by number or more with respect to the entire particles of the white pigment, and a maximum value of a frequency with respect to particles of the white pigment having a maximum Feret diameter of 650 nm or more and less than 1,000 nm is larger than a minimum value of a frequency with respect to particles of the white pigment having a maximum Feret diameter of 500 nm or more and less than 650 nm.
    Type: Application
    Filed: April 21, 2017
    Publication date: April 26, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Masaki IWASE, Atsushi SUGAWARA, Tsuyoshi MURAKAMI, Kana YOSHIDA
  • Patent number: 9946182
    Abstract: An electrostatic charge image developing toner includes toner particles including a binder resin and a white pigment, wherein a maximum frequent value in distribution of eccentricity B of the white pigment represented by the following Expression (1) is from 0.75 to 0.95, and a skewness in the distribution of the eccentricity B is from ?1.20 to 0.00: Expression (1): eccentricity B=2d/D, wherein D represents an equivalent circle diameter (?m) of a toner particle in observation of the cross section of the toner particle, and d represents a distance (?m) from the centroid of the toner particle to the centroid of the white pigment in observation of the cross section of the toner particle.
    Type: Grant
    Filed: February 6, 2017
    Date of Patent: April 17, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Tsuyoshi Murakami, Atsushi Sugawara, Kana Yoshida, Masaki Iwase
  • Publication number: 20180067414
    Abstract: An electrostatic charge image developing toner includes toner particles including a binder resin and a white pigment, wherein a maximum frequent value in distribution of eccentricity B of the white pigment represented by the following Expression (1) is from 0.75 to 0.95, and a skewness in the distribution of the eccentricity B is from ?1.20 to 0.00: Expression (1): eccentricity B=2d/D, wherein D represents an equivalent circle diameter (?m) of a toner particle in observation of the cross section of the toner particle, and d represents a distance (?m) from the centroid of the toner particle to the centroid of the white pigment in observation of the cross section of the toner particle.
    Type: Application
    Filed: February 6, 2017
    Publication date: March 8, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Tsuyoshi MURAKAMI, Atsushi SUGAWARA, Kana YOSHIDA, Masaki IWASE
  • Patent number: 9904196
    Abstract: A white toner for developing an electrostatic charge image includes a white toner particle containing a binder resin and a white pigment particle, wherein, when a number average circle equivalent diameter of the white pigment particles, which are observed in a sectional image of the white toner particle, is taken as A, and a number average circle equivalent diameter of the white pigment particles, which are present in a surface layer portion within 35% from a surface of the white toner particle with respect to a particle diameter thereof, is taken as B, a relationship expressed by A>B is satisfied.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: February 27, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kana Yoshida, Atsushi Sugawara, Tsuyoshi Murakami, Masaki Iwase
  • Patent number: 9835962
    Abstract: There is provided an electrostatic image-developing toner containing a binder resin, a coloring agent and a release agent having a melting temperature of 85° C. to 120° C., the toner having a sea-island structure involving a sea part containing the binder resin and an island part containing the release agent, wherein a mode value of the distribution of the eccentricity degree B of the release agent-containing island part, represented by the specific formula, is from 0.75 to 1.00 and a skewness of the distribution of the eccentricity degree B is from ?1.30 to ?0.50.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: December 5, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Satoshi Kamiwaki, Akira Matsumoto, Tsuyoshi Murakami, Satoshi Miura, Atsushi Sugawara, Yukiaki Nakamura, Kana Yoshida, Yutaka Saito, Sakon Takahashi, Yasuaki Hashimoto, Koji Sasaki, Tsutomu Furuta
  • Publication number: 20170285501
    Abstract: An image forming apparatus includes a first image forming unit that forms a yellow image by an electrostatic charge image developing yellow toner; a second image forming unit that forms a magenta image by an electrostatic charge image developing magenta toner; a transfer unit that transfers the yellow image and the magenta image to a recording medium; and a fixing unit that fixes the yellow image and the magenta image to the recording medium, wherein a maximum absorption wavelength ?max (M) of the electrostatic charge image developing magenta toner at a wavelength of 360 nm to 760 nm is from 530 nm to 580 nm, and when an absorbance of the maximum absorption wavelength ?max (M) is standardized to 1, an absorbance at a wavelength of 450 nm is 0.20 or less and an absorbance at a wavelength of 400 nm is 0.10 or less.
    Type: Application
    Filed: August 2, 2016
    Publication date: October 5, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kana YOSHIDA, Akira MATSUMOTO, Satoshi MIURA
  • Patent number: 9671708
    Abstract: An electrostatic charge image developing toner includes a toner particle that has a sea-island structure including a sea portion containing a binder resin and an island portion containing a release agent and having at least two maximum values of distribution of a degree of uneven distribution B of the island portion shown by the following Equation (1): degree of uneven distribution B=2d/D??Equation (1) in Equation (1), D represents an equivalent circle diameter (?m) of the toner particle obtained by cross section observation of the toner particle, and d represents a distance (?m) between the center of gravity of the toner particle and the center of gravity of the island portion containing the release agent obtained by cross section observation of the toner particle.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: June 6, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Kana Yoshida, Atsushi Sugawara, Tsuyoshi Murakami, Yukiaki Nakamura
  • Patent number: 9529288
    Abstract: An electrostatic charge image developing toner includes a toner particle containing a binder resin, a release agent, and an inorganic mineral, wherein 80% or more of the entire release agent is present in a portion within 400 nm from the surface of the toner particle and 80% or more of the entire inorganic mineral is present in a portion within 400 nm from the surface of the toner particle.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: December 27, 2016
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Atsushi Sugawara, Kana Yoshida, Tsuyoshi Murakami, Yukiaki Nakamura
  • Publication number: 20160124334
    Abstract: An electrostatic charge image developing toner includes a toner particle that has a sea-island structure including a sea portion containing a binder resin and an island portion containing a release agent and having at least two maximum values of distribution of a degree of uneven distribution B of the island portion shown by the following Equation (1): degree of uneven distribution B=2d/D??Equation (1) in Equation (1), D represents an equivalent circle diameter (?m) of the toner particle obtained by cross section observation of the toner particle, and d represents a distance (?m) between the center of gravity of the toner particle and the center of gravity of the island portion containing the release agent obtained by cross section observation of the toner particle.
    Type: Application
    Filed: May 13, 2015
    Publication date: May 5, 2016
    Inventors: Kana YOSHIDA, Atsushi SUGAWARA, Tsuyoshi MURAKAMI, Yukiaki NAKAMURA
  • Publication number: 20160085165
    Abstract: There is provided an electrostatic image-developing toner containing a binder resin, a coloring agent and a release agent having a melting temperature of 85° C. to 120° C., the toner having a sea-island structure involving a sea part containing the binder resin and an island part containing the release agent, wherein a mode value of the distribution of the eccentricity degree B of the release agent-containing island part, represented by the specific formula, is from 0.75 to 1.00 and a skewness of the distribution of the eccentricity degree B is from ?1.30 to ?0.50.
    Type: Application
    Filed: February 24, 2015
    Publication date: March 24, 2016
    Inventors: Satoshi KAMIWAKI, Akira MATSUMOTO, Tsuyoshi MURAKAMI, Satoshi MIURA, Atsushi SUGAWARA, Yukiaki NAKAMURA, Kana YOSHIDA, Yutaka SAITO, Sakon TAKAHASHI, Yasuaki HASHIMOTO, Koji SASAKI, Tsutomu FURUTA