Patents by Inventor Yasuo Kadokura

Yasuo Kadokura 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: 11181847
    Abstract: A carrier for electrostatic image development includes: a core material; and a coating resin layer that contains inorganic particles and covers the core material. The content of the inorganic particles is 10% by mass or more and 60% by mass or less based on the total mass of the coating resin layer. The volume average diameter D (?m) of the inorganic particles and the thickness T (?m) of the coating resin layer satisfy the following relational expression (1): 0.007?D/T?0.24.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: November 23, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Shintaro Anno, Takuro Watanabe, Yasuaki Hashimoto, Yasuo Kadokura, Kazutsuna Sasaki, Jumpei Iwasaki
  • Publication number: 20210278773
    Abstract: An electrostatic charge image developing carrier includes: magnetic particles; and a resin layer coating the magnetic particles and containing inorganic particles, in which an average particle diameter of the inorganic particles is 5 nm or more and 90 nm or less, an average thickness of the resin layer is 0.6 ?m or more and 1.4 ?m or less, and a ratio B/A of a surface area B of the electrostatic charge image developing carrier to a plan view area A of the electrostatic charge image developing carrier is 1.020 or more and 1.100 or less when a surface of the electrostatic charge image developing carrier is three-dimensionally analyzed.
    Type: Application
    Filed: July 31, 2020
    Publication date: September 9, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Jumpei IWASAKI, Yasuo Kadokura, Shintaro Anno, Kazutsuna Sasaki, Satoshi Miura
  • Publication number: 20210271180
    Abstract: An electrostatic charge image developing carrier includes: magnetic particles; and a resin layer coating the magnetic particles and containing inorganic particles, in which an exposed area ratio of the magnetic particles is 0.1% or more and 4.0% or less, an average particle diameter of the inorganic particles is 5 nm or more and 90 nm or less, and a ratio B/A of a surface area B of the electrostatic charge image developing carrier to a plan view area A of the electrostatic charge image developing carrier is 1.020 or more and 1.100 or less when a surface of the electrostatic charge image developing carrier is three-dimensionally analyzed.
    Type: Application
    Filed: July 31, 2020
    Publication date: September 2, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Kazutsuna SASAKI, Yasuo KADOKURA, Shintaro ANNO, Satoshi MIURA, Jumpei IWASAKI
  • 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
  • Publication number: 20210088924
    Abstract: A carrier for electrostatic image development includes: a core material; and a coating resin layer that contains inorganic particles and covers the core material. The content of the inorganic particles is 10% by mass or more and 60% by mass or less based on the total mass of the coating resin layer. The volume average diameter D (?m) of the inorganic particles and the thickness T (?m) of the coating resin layer satisfy the following relational expression (1): 0.007?D/T?0.24.
    Type: Application
    Filed: April 6, 2020
    Publication date: March 25, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Shintaro ANNO, Takuro WATANABE, Yasuaki HASHIMOTO, Yasuo KADOKURA, Kazutsuna SASAKI, Jumpei IWASAKI
  • 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: 10807058
    Abstract: A silica-titania composite aerogel particle includes: a base particle including silicon and titanium whose element ratio Si/Ti is more than 0 and 6 or less; and a surface layer present on the base particle and including a metal compound having a metal atom and a hydrocarbon group. The silica-titania composite aerogel particle has absorption at wavelengths of 450 nm and 750 nm in a visible absorption spectrum, has a BET specific surface area in the range of 200 m2/g to 1,200 m2/g, and has a value A in the range of 0.03 to 0.3. The value A is calculated by formula: A=(peak intensity of C—O bond+peak intensity of C?O bond)/(peak intensity of C—C bond+peak intensity of C?C bond). The peak intensity is obtained from a C is XPS spectrum.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: October 20, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuo Kadokura, Yuka Zenitani, Hiroyoshi Okuno, Hideaki Yoshikawa, Yasunobu Kashima, Takeshi Iwanaga, Shunsuke Nozaki, Sakae Takeuchi
  • Patent number: 10807070
    Abstract: Provided is a silica titania composite aerogel particle including a base particle in which an element ratio Si/Ti of silicon to titanium is greater than 0 and equal to or lower than 6. A BET specific surface area of the silica titania composite particle is within a range of 200 m2/g to 1200 m2/g, and the silica titania composite particle has absorption at wavelengths of 450 nm and 750 nm.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: October 20, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasunobu Kashima, Hideaki Yoshikawa, Yasuo Kadokura, Takeshi Iwanaga, Shunsuke Nozaki, Sakae Takeuchi, Yuka Zenitani, Hiroyoshi Okuno
  • Publication number: 20200292951
    Abstract: An electrostatic-image developing toner includes toner particles including a binder resin including an amorphous resin including a polyester resin segment and a styrene acrylate resin segment and a release agent. The content of 5?-chloro-3-hydroxy-2?-methoxy-2-naphthanilide in the electrostatic-image developing toner is 1,000 ppm by mass or less.
    Type: Application
    Filed: July 22, 2019
    Publication date: September 17, 2020
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo KADOKURA, Daisuke TOMITA, Atsushi SUGAWARA
  • 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: 10754269
    Abstract: An electrostatic-image developing toner includes toner particles including a binder resin including an amorphous resin including a polyester resin segment and a styrene acrylate resin segment and a release agent. The content of 5?-chloro-3-hydroxy-2?-methoxy-2-naphthanilide in the electrostatic-image developing toner is 1,000 ppm by mass or less.
    Type: Grant
    Filed: July 22, 2019
    Date of Patent: August 25, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuo Kadokura, Daisuke Tomita, Atsushi Sugawara
  • Patent number: 10732532
    Abstract: An electrostatic image developing toner includes toner base particles including at least a binder resin and a release agent, wherein the binder resin includes a hybrid resin having a polyester resin segment and a styrene-acrylic copolymer segment, and a molecular weight distribution curve of the toner satisfies Formula (1): 1.3?b/a?2.5, where, in the molecular weight distribution curve in which a perpendicular line is drawn from a baseline to a peak top having a peak top height to divide the molecular weight distribution curve into a lower-molecular-weight region and a higher-molecular-weight region, a represents a width of the lower-molecular-weight region at a height of 15% of the peak top height, and b represents a width of the higher-molecular-weight region at a height of 15% of the peak top height.
    Type: Grant
    Filed: July 22, 2019
    Date of Patent: August 4, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Atsushi Sugawara, Yasuo Kadokura, Daisuke Tomita
  • 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
  • Patent number: 10656546
    Abstract: An electrostatic-image developing toner includes toner particles including a binder resin including an amorphous resin including a polyester resin segment and a styrene acrylate resin segment and a release agent. The content of 1-amino-2-methoxybenzene in the electrostatic-image developing toner is 200 ppm by mass or less.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: May 19, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Daisuke Tomita, Yasuo Kadokura, Atsushi Sugawara
  • 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: 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
  • 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: 10563018
    Abstract: A titanium oxide aerogel particle has absorption at wavelengths of 450 nm and 750 nm in a visible absorption spectrum, a surface to which a metal compound containing a metal atom and a hydrocarbon group is bonded via an oxygen atom, a BET specific surface area in a range of 120 m2/g to 1,000 m2/g, and a value A is in the range of 0.03 to 0.3. The value A is calculated by formula: A={(peak intensity of C—O bond+peak intensity of C?O bond)/(peak intensity of C—C bond+peak intensity of C?C bond)}. In the formula, the peak intensity is a value determined from a C 1s XPS spectrum.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: February 18, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hideaki Yoshikawa, Hiroyoshi Okuno, Yasunobu Kashima, Takeshi Iwanaga, Sakae Takeuchi, Yuka Zenitani, Shunsuke Nozaki, Yasuo Kadokura
  • Patent number: 10538434
    Abstract: A titanium oxide aerogel particle includes a metallic compound that has a metal atom and a hydrocarbon group, the metallic compound being bonded to a surface of the aerogel particle via an oxygen atom. The titanium oxide aerogel particle has a BET specific surface area of 120 m2/g to 1000 m2/g, and has absorption at wavelengths of 450 nm and 750 nm.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: January 21, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Sakae Takeuchi, Hiroyoshi Okuno, Hideaki Yoshikawa, Yasuo Kadokura, Yasunobu Kashima, Takeshi Iwanaga, Shunsuke Nozaki, Yuka Zenitani
  • 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