Patents by Inventor Takahiro Ishizuka

Takahiro Ishizuka 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: 11016404
    Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed on the conductive substrate. An outermost surface layer of the electrophotographic photoreceptor contains a fluorine-based graft polymer and a fluorine-containing resin particle. The fluorine-based graft polymer includes at least a first structural unit that does not have an acidic group with a pKa of 3 or less but has a fluorine atom, a second structural unit derived from a macromonomer, and a third structural unit having the acidic group with a pKa of 3 or less.
    Type: Grant
    Filed: January 20, 2020
    Date of Patent: May 25, 2021
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Tomoya Sasaki, Masahiro Iwasaki, Ryosuke Fujii, Wataru Yamada, Takahiro Ishizuka
  • Publication number: 20210080843
    Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed on the conductive substrate. An outermost surface layer of the electrophotographic photoreceptor contains a fluorine-based graft polymer and a fluorine-containing resin particle. The fluorine-based graft polymer includes at least a first structural unit that does not have an acidic group with a pKa of 3 or less but has a fluorine atom, a second structural unit derived from a macromonomer, and a third structural unit having the acidic group with a pKa of 3 or less.
    Type: Application
    Filed: January 20, 2020
    Publication date: March 18, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Tomoya SASAKI, Masahiro IWASAKI, Ryosuke FUJII, Wataru YAMADA, Takahiro ISHIZUKA
  • Publication number: 20210018854
    Abstract: A toner set includes a color toner and a transparent toner that has a pressure phase transition property. The color toner and the transparent toner satisfy 1.0?tan ?1?4.0 and 1.2?tan ?1/tan ?2?3.0 where tan ?1 represents tan ? of the color toner at 100° C., and tan ?2 represents tan ? of the transparent toner at 100° C.
    Type: Application
    Filed: January 14, 2020
    Publication date: January 21, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takahiro ISHIZUKA, Yasunobu KASHIMA, Hajime SUGAHARA, Susumu YOSHINO
  • Publication number: 20210017424
    Abstract: A pressure sensitive adhesive particle includes a styrene resin; and a (meth)acrylate resin, wherein the (meth)acrylate resin contains two kinds of (meth)acrylates as a polymerization component in which the weight proportion of the (meth)acrylate to the total polymerization components is 90% by weight or more, and has two glass transition points in which a difference between the lowest glass transition temperature and the highest glass transition temperature is 30° C. or higher.
    Type: Application
    Filed: March 13, 2020
    Publication date: January 21, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takahiro ISHIZUKA, Satoshi KAMIWAKI, Sumiaki YAMASAKI, Yoshifumi IIDA, Sakae TAKEUCHI, Satomi KASHIWAGI, Susumu YOSHINO
  • Publication number: 20210017429
    Abstract: A pressure sensitive adhesive particle includes a styrene resin; and a (meth)acrylate resin, wherein the (meth)acrylate resin contains two kinds of (meth)acrylates as a polymerization component in which the weight proportion of the (meth)acrylate to the total polymerization components is 90% by weight or more, and has two glass transition points in which a difference between the lowest glass transition temperature and the highest glass transition temperature is 30° C. or higher.
    Type: Application
    Filed: August 26, 2020
    Publication date: January 21, 2021
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takahiro ISHIZUKA, Satoshi KAMIWAKI, Sumiaki YAMASAKI, Yoshifumi IIDA, Sakae TAKEUCHI, Satomi KASHIWAGI, Susumu YOSHINO
  • Patent number: 10604664
    Abstract: An infrared absorbing particle dispersion includes an aqueous medium; and infrared absorbing particles that are dispersed in the aqueous medium and contain a compound represented by formula (1) below and at least one polymer selected from the group consisting of polyurethane, polyester, polyamide, polyurea, and polycarbonate, each having an acid value of from 5 mg KOH/g to 50 mg KOH/g: wherein, in formula (1), Ra represents a group represented by formula (1-R) and Rb, Re, and Rd each independently represent an alkyl group, and, in formula (1-R), Re represents a hydrogen atom or a methyl group and n represents an integer of from 0 to 3.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: March 31, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Takahiro Ishizuka
  • Patent number: 10407585
    Abstract: Provided is an aqueous ink for ink jet recording that includes: water; a water-soluble organic solvent; a coloring material; and a specific compound having a structure expressed by the following General Formula (I), wherein ink pH is in a range of 6.5 to 8.5. In General Formula (I), Ra, Rb, Rc, and Rd each independently represent a structure expressed by General Formula (I-R) or an alkyl group having 1 to 6 carbon atoms which is not branched, R1 represents a hydrogen atom or a methyl group, and n represents an integer in a range of 0 to 3, and the total carbon number of the structure expressed by General Formula (I-R) is equal to or less than 6.
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: September 10, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshiro Yamashita, Takahiro Ishizuka, Mamoru Fujita, Kazuhiko Hirokawa, Shimpei Takagi
  • Patent number: 10266713
    Abstract: A particle dispersion liquid includes: an aqueous medium; at least one of a compound represented by Formula (I) and a compound represented by Formula (II), which is dispersed in the aqueous medium; and at least one of: (i) a polymer having alkyl (meth) acrylate as a structural unit, the alkyl (meth) acrylate containing an alicyclic hydrocarbon group having a bridged bond, the polymer having an acid value ranging from 6 mgKOH/g to 100 mgKOH/g, and (ii) a polyester resin containing 20% by mass or more of a unit represented by Formula (F1) in the polyester.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: April 23, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Suguru Nakaso, Naomi Miyamoto, Takahiro Ishizuka, Soichiro Kitagawa
  • Patent number: 10195641
    Abstract: An electrostatic powder coating method includes spraying a charged powder coating material including powder particles that contain a thermosetting resin and a thermosetting agent, and an external additive that includes oxide particles containing at least one of titania and alumina to electrostatically attach the powder coating material to an object to be coated, and heating the powder coating material that is electrostatically attached to the object to be coated to thereby form a coating film, wherein a content Ac of the oxide particles in the powder coating material that is electrostatically attached to the object to be coated and a content Ao of the oxide particles in the powder coating material before being sprayed satisfy a relationship of Expression: Ao×0.80?Ac?Ao×1.20.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: February 5, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takahiro Ishizuka, Takeshi Agata, Susumu Yoshino, Shigeru Seitoku
  • Patent number: 10087271
    Abstract: A polymer includes 2-carboxyethyl (meth)acrylate and alkyl (meth)acrylate as constituent units and having an acid value of 7 mg KOH/g to 100 mg KOH/g.
    Type: Grant
    Filed: May 1, 2017
    Date of Patent: October 2, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Takahiro Ishizuka
  • Publication number: 20180273785
    Abstract: A particle dispersion liquid includes: an aqueous medium; at least one of a compound represented by Formula (I) and a compound represented by Formula (II), which is dispersed in the aqueous medium; and at least one of: (i) a polymer having alkyl (meth) acrylate as a structural unit, the alkyl (meth) acrylate containing an alicyclic hydrocarbon group having a bridged bond, the polymer having an acid value ranging from 6 mgKOH/g to 100 mgKOH/g, and (ii) a polyester resin containing 20% by mass or more of a unit represented by Formula (F1) in the polyester.
    Type: Application
    Filed: July 7, 2017
    Publication date: September 27, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Suguru NAKASO, Naomi MIYAMOTO, Takahiro ISHIZUKA, Soichiro KITAGAWA
  • Patent number: 10040949
    Abstract: A thermosetting powder coating material includes powder particles containing a mixture of a vinyl resin A including a block isocyanate group and a carboxyl group and a vinyl resin B including a hydroxyl group and a carboxyl group, or a vinyl resin C including a block isocyanate group, a hydroxyl group and a carboxyl group, wherein a content of the isocyanate group is from 0.4 mmol/g to 1.4 mmol/g, and a functional group molar ratio of [NCO/(COOH+OH)], which is obtained by dividing the content of the isocyanate group by a total content of the hydroxyl group and the carboxyl group, is from 0.5 to 1.2.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: August 7, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Takahiro Ishizuka
  • Publication number: 20180086930
    Abstract: Provided is an aqueous ink for ink jet recording that includes: water; a water-soluble organic solvent; a coloring material; and a specific compound having a structure expressed by the following General Formula (I), wherein ink pH is in a range of 6.5 to 8.5. In General Formula (I), Ra, Rb, Rc, and Rd each independently represent a structure expressed by General Formula (I-R) or an alkyl group having 1 to 6 carbon atoms which is not branched, R1 represents a hydrogen atom or a methyl group, and n represents an integer in a range of 0 to 3, and the total carbon number of the structure expressed by General Formula (I-R) is equal to or less than 6.
    Type: Application
    Filed: May 11, 2017
    Publication date: March 29, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yoshiro YAMASHITA, Takahiro ISHIZUKA, Mamoru FUJITA, Kazuhiko HIROKAWA, Shimpei TAKAGI
  • Publication number: 20180057627
    Abstract: A polymer includes 2-carboxyethyl (meth)acrylate and alkyl (meth)acrylate as constituent units and having an acid value of 7 mg KOH/g to 100 mg KOH/g.
    Type: Application
    Filed: May 1, 2017
    Publication date: March 1, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Takahiro ISHIZUKA
  • Publication number: 20180057700
    Abstract: An infrared absorbing particle dispersion includes an aqueous medium; and infrared absorbing particles that are dispersed in the aqueous medium and contain a compound represented by formula (1) below and at least one polymer selected from the group consisting of polyurethane, polyester, polyamide, polyurea, and polycarbonate, each having an acid value of from 5 mg KOH/g to 50 mg KOH/g: wherein, in formula (1), Ra represents a group represented by formula (1-R) and Rb, Rc, and Rd each independently represent an alkyl group, and, in formula (1-R). Re represents a hydrogen atom or a methyl group and n represents an integer of from 0 to 3.
    Type: Application
    Filed: May 9, 2017
    Publication date: March 1, 2018
    Applicant: FUJI XEROX CO., LTD.
    Inventor: Takahiro ISHIZUKA
  • Patent number: 9862836
    Abstract: A thermosetting powder coating material includes a thermosetting resin, a thermosetting agent, and metal salt containing an alkyl group having 5 to 20 carbon atoms.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: January 9, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Susumu Yoshino, Takahiro Ishizuka, Takeshi Agata
  • Patent number: 9760034
    Abstract: There is provided a resin composition containing an infrared absorber as an inner salt, at least either a carboxylic acid ester or a phosphoric acid ester, and a resin; and an image forming material containing an infrared absorber as an inner salt, at least either a carboxylic acid ester or a phosphoric acid ester, and a thermoplastic resin.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: September 12, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Minquan Tian, Takahiro Ishizuka, Makoto Furuki, Shinji Hasegawa
  • Publication number: 20170173626
    Abstract: An electrostatic powder coating method includes spraying a charged powder coating material including powder particles that contain a thermosetting resin and a thermosetting agent, and an external additive that includes oxide particles containing at least one of titania and alumina to electrostatically attach the powder coating material to an object to be coated, and heating the powder coating material that is electrostatically attached to the object to be coated to thereby form a coating film, wherein a content Ac of the oxide particles in the powder coating material that is electrostatically attached to the object to be coated and a content Ao of the oxide particles in the powder coating material before being sprayed satisfy a relationship of Expression: Ao×0.80?Ac?Ao×1.20.
    Type: Application
    Filed: April 5, 2016
    Publication date: June 22, 2017
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Takahiro ISHIZUKA, Takeshi AGATA, Susumu YOSHINO, Shigeru SEITOKU
  • Patent number: 9550915
    Abstract: A thermosetting powder coating material contains powder particles having a core that has a sea-island structure composed of an island portion containing a surface adjusting agent and a sea portion containing a thermosetting resin and a thermosetting agent, and a resin coating portion that coats a surface of the core.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: January 24, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takeshi Agata, Susumu Yoshino, Takahiro Ishizuka
  • Patent number: 9550902
    Abstract: An aqueous ink contains a colorant, an aqueous solvent, and as an infrared absorber, a compound represented by general formula (I): where Rb, Rc, and Rd are each independently alkyl, and Ra is a group represented by general formula (I-R): where Re is hydrogen or methyl, and e is an integer of 0 to 3.
    Type: Grant
    Filed: January 28, 2016
    Date of Patent: January 24, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Akira Sakamoto, Kazuhiko Hirokawa, Takashi Kikuchi, Takahiro Ishizuka, Suguru Nakaso