Patents by Inventor Sakiko HIRAI

Sakiko HIRAI 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: 20210109454
    Abstract: Provided is a toner including toner particles. The toner particles has a volume particle diameter distribution index on a side of the largest diameter (GSDv (90/50)) of 1.26 or less; a number particle diameter distribution index on a side of the smallest diameter (GSDp (50/10)) of 1.28 or less; GSDv (90/50)/GSDp (50/10) of from 0.96 to 1.01; and an average circularity of 0.95 or more and 1.00 or less.
    Type: Application
    Filed: December 22, 2020
    Publication date: April 15, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Atsushi SUGAWARA, Satoshi MIURA, Akira MATSUMOTO, Sakiko HIRAI, Yasuo KADOKURA
  • Patent number: 10908523
    Abstract: Provided is a toner including toner particles. The toner particles has a volume particle diameter distribution index on a side of the largest diameter (GSDv (90/50)) of 1.26 or less; a number particle diameter distribution index on a side of the smallest diameter (GSDp (50/10)) of 1.28 or less; GSDv (90/50)/GSDp (50/10) of from 0.96 to 1.01; and an average circularity of 0.95 or more and 1.00 or less.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: February 2, 2021
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Atsushi Sugawara, Satoshi Miura, Akira Matsumoto, Sakiko Hirai, Yasuo Kadokura
  • Patent number: 10761444
    Abstract: An electrostatic charge image development toner satisfies the following: a maximum slope of an absolute value of log (loss modulus G?) from 60° C. to 90° C. is 0.07 or more and 0.16 or less; a maximum slope of an absolute value of log (loss modulus G?) from 90° C. to 130° C. is 0.08 or less; and G?(60) is 5.0×107 Pa or more and 1.0×1010 Pa or less, where G?(60) is a loss modulus at 60° C.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: September 1, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Atsushi Sugawara, Yasuo Kadokura, Daisuke Tomita, Sakiko Hirai, Satoshi Miura
  • Patent number: 10719022
    Abstract: An electrostatic charge image developing toner has a surface property index value represented by Formula S of 2.0 to 2.8, an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 2.8 and 3.5 or less, and an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 1.0 and less than 2.0 and a calculated value of a specific surface area in Formula S of 0.70 to 1.3: (Surface property index value)=(Measured value of specific surface area)/(Calculated value of specific surface area)??Formula S wherein (Calculated value of specific surface area)=(Sum of surface areas calculated from equivalent circle diameters of 4,500 toner particles in flow particle image analysis)/{(Specific gravity of toner)×(Sum of volumes calculated from equivalent circle diameters of 4,500 toner particles in flow particle image analysis)}.
    Type: Grant
    Filed: August 14, 2018
    Date of Patent: July 21, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuo Kadokura, Atsushi Sugawara, Daisuke Tomita, Sakiko Hirai, Satoshi Miura, Akira Matsumoto
  • Publication number: 20200089137
    Abstract: An electrostatic charge image development toner satisfies the following: a maximum slope of an absolute value of log (loss modulus G?) from 60° C. to 90° C. is 0.07 or more and 0.16 or less; a maximum slope of an absolute value of log (loss modulus G?) from 90° C. to 130° C. is 0.08 or less; and G?(60) is 5.0×107 Pa or more and 1.0×1010 Pa or less, where G?(60) is a loss modulus at 60° C.
    Type: Application
    Filed: January 29, 2019
    Publication date: March 19, 2020
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Atsushi SUGAWARA, Yasuo KADOKURA, Daisuke TOMITA, Sakiko HIRAI, Satoshi MIURA
  • Publication number: 20200089138
    Abstract: An electrostatic charge image development toner satisfies the following: (ln ?(T1)?ln ?(T2))/(T1?T2) is ?0.14 or less, (ln ?(T2)?ln ?(T3))/(T2?T3) is ?0.15 or more, and (ln ?(T2)?ln ?(T3))/(T2?T3) is more than (ln ?(T1)?ln ?(T2))/(T1?T2), where ?(T1) represents a viscosity ? of the toner at T1=60° C., ?(T2) represents a viscosity ? of the toner at T2=90° C., and ?(T3) represents a viscosity ? of the toner at T3=130° C.
    Type: Application
    Filed: January 24, 2019
    Publication date: March 19, 2020
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo KADOKURA, Atsushi SUGAWARA, Daisuke TOMITA, Sakiko HIRAI, Satoshi MIURA
  • Publication number: 20190317417
    Abstract: An electrostatic charge image developing toner includes a styrene-acrylic resin and exhibits a z average molecular weight Mz of 80,000 to 400,000 and a molecular weight distribution curve satisfying Expression (1): 1.3?b/a?2.0, and an electrostatic charge image developing toner includes a styrene-acrylic resin, and exhibits a z average molecular weight Mz of 100,000 to 400,000 and a molecular weight distribution curve satisfying Expression (A): 0.75?(c+d)/(2×d)?0.95, wherein a, b, c and d are defined in the specification.
    Type: Application
    Filed: August 30, 2018
    Publication date: October 17, 2019
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Atsushi SUGAWARA, Sakiko HIRAI, Yasuo KADOKURA, Daisuke TOMITA, Satoshi MIURA
  • Publication number: 20190294062
    Abstract: An electrostatic charge image developing toner has a surface property index value represented by Formula S of 2.0 to 2.8, an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 2.8 and 3.5 or less, and an electrostatic charge image developing toner has a surface property index value represented by Formula S of more than 1.0 and less than 2.0 and a calculated value of a specific surface area in Formula S of 0.70 to 1.3: (Surface property index value)=(Measured value of specific surface area)/(Calculated value of specific surface area)??Formula S wherein (Calculated value of specific surface area)=(Sum of surface areas calculated from equivalent circle diameters of 4,500 toner particles in flow type particle image analysis)/{((Specific gravity of toner)×(Sum of volumes calculated from equivalent circle diameters of 4,500 toner particles in flow type particle image analysis)}.
    Type: Application
    Filed: August 14, 2018
    Publication date: September 26, 2019
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo KADOKURA, Atsushi SUGAWARA, Daisuke TOMITA, Sakiko HIRAI, Satoshi MIURA, Akira MATSUMOTO
  • Patent number: 10423088
    Abstract: An electrostatic charge image developing toner includes a styrene-acrylic resin and exhibits a z average molecular weight Mz of 80,000 to 400,000 and a molecular weight distribution curve satisfying Expression (1): 1.3?b/a?2.0, and an electrostatic charge image developing toner includes a styrene-acrylic resin, and exhibits a z average molecular weight Mz of 100,000 to 400,000 and a molecular weight distribution curve satisfying Expression (A): 0.75?(c+d)/(2×d)?0.95, wherein a, b, c and d are defined in the specification.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: September 24, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Atsushi Sugawara, Sakiko Hirai, Yasuo Kadokura, Daisuke Tomita, Satoshi Miura
  • Publication number: 20190094728
    Abstract: Provided is a toner including toner particles. The toner particles has a volume particle diameter distribution index on a side of the largest diameter (GSDv (90/50)) of 1.26 or less; a number particle diameter distribution index on a side of the smallest diameter (GSDp (50/10)) of 1.28 or less; GSDv (90/50)/GSDp (50/10) of from 0.96 to 1.01; and an average circularity of 0.95 or more and 1.00 or less.
    Type: Application
    Filed: May 24, 2018
    Publication date: March 28, 2019
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Atsushi SUGAWARA, Satoshi MIURA, Akira MATSUMOTO, Sakiko HIRAI, Yasuo KADOKURA
  • Patent number: 10095142
    Abstract: A brilliant toner includes toner particles that contain a binder resin and a brilliant pigment which has a flake shape, wherein an average thickness of the brilliant pigment is greater than 0.5 ?m to 1.5 ?m.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: October 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Sakiko Hirai, Satomi Hara, Masaru Takahashi, Atsushi Sugawara
  • Patent number: 9989872
    Abstract: An electrostatic charge image developing toner includes toner particles each including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement to determine an area ratio of the crystalline resin on a cross section of the toner particle before and after being heated at a temperature of 50° C. and a humidity of 50% RH for three days, a relationship between an area ratio a (%) of the crystalline resin on a cross section with respect to the toner particles before being heated, and an area ratio b (%) of the crystalline resin on the cross section with respect to the toner particles after being heated satisfies Expression (1): 0.9?a/b?1.0.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: June 5, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yukiaki Nakamura, Akira Matsumoto, Yasuo Kadokura, Shinya Nakashima, Satoshi Miura, Sakiko Hirai, Shotaro Takahashi, Daisuke Tomita, Satoshi Kamiwaki, Masaru Takahashi
  • Publication number: 20180059563
    Abstract: An electrostatic charge image developing toner includes toner particles each including an amorphous resin and a crystalline resin, wherein, when the toner particles are subjected to a measurement to determine an area ratio of the crystalline resin on a cross section of the toner particle before and after being heated at a temperature of 50° C. and a humidity of 50% RH for three days, a relationship between an area ratio a (%) of the crystalline resin on a cross section with respect to the toner particles before being heated, and an area ratio b (%) of the crystalline resin on the cross section with respect to the toner particles after being heated satisfies Expression (1): 0.9?a/b?1.0.
    Type: Application
    Filed: April 20, 2017
    Publication date: March 1, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yukiaki NAKAMURA, Akira MATSUMOTO, Yasuo KADOKURA, Shinya NAKASHIMA, Satoshi MIURA, Sakiko HIRAI, Shotaro TAKAHASHI, Daisuke TOMITA, Satoshi KAMIWAKI, Masaru TAKAHASHI
  • Patent number: 9891555
    Abstract: An electrostatic charge image developing toner set includes a brilliant toner including toner particles that include a brilliant pigment and a first binder resin, a black toner including toner particles that include a second binder resin, and a color toner except a black toner, including toner particles that include a third binder resin, wherein the brilliant toner, the black toner and the color toner satisfy Expression (1): Dielectric loss factor of the brilliant Toner>Dielectric loss factor of the black toner>Dielectric loss factor of the color toner and Expression (2): 25×10?3?(Dielectric loss factor of the brilliant toner)?(Dielectric loss factor of the color toner)?95×10?3.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: February 13, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Satomi Hara, Masaru Takahashi, Atsushi Sugawara, Sakiko Hirai
  • Patent number: 9864288
    Abstract: A toner set includes a brilliant toner including a brilliant pigment; and a chromatic toner including a coloring agent that is different from the brilliant pigment, wherein the toner set satisfies the following expression: 1.2?Q1/Q2?5.0 wherein Q1 represents an endothermic quantity of the brilliant toner and Q2 represents an endothermic quantity of the chromatic toner.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: January 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shotaro Takahashi, Atsushi Sugitate, Masaru Takahashi, Sakiko Hirai, Satomi Hara
  • Patent number: 9841693
    Abstract: A brilliant toner includes release agent domains meeting conditions (1) a length of the release agent domain in a longitudinal axis direction is 300 nm to 1,500 nm, (2) a ratio between the length in the longitudinal axis direction and in a short axis direction of the release agent domain is 3.0 to 15.0, (3) an angle between (a) a tangent line passing through a contact point of (a1) a circumference of a circle that is centered at a centroid of the release agent domain and is inscribed in an outer edge of the toner particle and (a2) the outer edge and (b) a line passing through the centroid and extending in the longitudinal axis direction is 0° to 45°, and (4) a ratio of a distance between the centroid and the contact point to an equivalent circle diameter of the toner particle is 0.03 to 0.25.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: December 12, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Atsushi Sugawara, Sakiko Hirai, Masaru Takahashi, Satomi Hara
  • Publication number: 20170285518
    Abstract: An electrostatic charge image developing toner set includes a brilliant toner including toner particles that include a brilliant pigment and a first binder resin, a black toner including toner particles that include a second binder resin, and a color toner except a black toner, including toner particles that include a third binder resin, wherein the brilliant toner, the black toner and the color toner satisfy Expression (1): Dielectric loss factor of the brilliant Toner>Dielectric loss factor of the black toner>Dielectric loss factor of the color toner and Expression (2): 25×10?3?(Dielectric loss factor of the brilliant toner)?(Dielectric loss factor of the color toner)?95×10?3.
    Type: Application
    Filed: July 28, 2016
    Publication date: October 5, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Satomi HARA, Masaru TAKAHASHI, Atsushi SUGAWARA, Sakiko HIRAI
  • Publication number: 20170255118
    Abstract: A brilliant toner includes toner particles that contain a binder resin and a brilliant pigment, wherein a water surface diffusion area, which is defined by JIS K5906:2009, of the brilliant pigment is from 5 m2/g to 20 m2/g and an average longitudinal length of the brilliant pigment is from 0.5 ?m to 10 ?m.
    Type: Application
    Filed: July 21, 2016
    Publication date: September 7, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Masaru TAKAHASHI, Satomi HARA, Sakiko HIRAI, Atsushi SUGAWARA
  • Publication number: 20170255117
    Abstract: A brilliant toner includes toner particles that contain a binder resin and a brilliant pigment which has a flake shape, wherein an average thickness of the brilliant pigment is greater than 0.5 ?m to 1.5 ?m.
    Type: Application
    Filed: July 19, 2016
    Publication date: September 7, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Sakiko HIRAI, Satomi HARA, Masaru TAKAHASHI, Atsushi SUGAWARA
  • Publication number: 20170227873
    Abstract: A brilliant toner includes release agent domains meeting conditions (1) a length of the release agent domain in a longitudinal axis direction is 300 nm to 1,500 nm, (2) a ratio between the length in the longitudinal axis direction and in a short axis direction of the release agent domain is 3.0 to 15.0, (3) an angle between (a) a tangent line passing through a contact point of (a1) a circumference of a circle that is centered at a centroid of the release agent domain and is inscribed in an outer edge of the toner particle and (a2) the outer edge and (b) a line passing through the centroid and extending in the longitudinal axis direction is 0° to 45°, and (4) a ratio of a distance between the centroid and the contact point to an equivalent circle diameter of the toner particle is 0.03 to 0.25.
    Type: Application
    Filed: July 20, 2016
    Publication date: August 10, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Atsushi SUGAWARA, Sakiko HIRAI, Masaru TAKAHASHI, Satomi HARA