Patents Examined by Mark A. Chapman
  • Patent number: 11188004
    Abstract: An electrostatic image developing toner includes toner particles, layered compound particles, and inorganic particles. The content of titanium in the electrostatic image developing toner is 0.1 ppm or more and less than 1,500 ppm.
    Type: Grant
    Filed: July 27, 2020
    Date of Patent: November 30, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Daisuke Noguchi, Yasuaki Hashimoto, Takashi Inukai, Takuro Watanabe, Sakiko Takeuchi
  • Patent number: 11188003
    Abstract: An electrophotographic photoreceptor includes a cylindrical substrate; and a surface layer located on an outer surface of the cylindrical substrate. At least a substrate central portion in a cylindrical axial direction of the outer surface of the cylindrical substrate is formed as a rough surface, and a surface roughness of a surface-layer central portion in the cylindrical axial direction of an outer surface of the surface layer is larger than that of at least one of two surface-layer end portions in the cylindrical axial direction of the outer surface of the surface layer. An image forming apparatus includes the electrophotographic photoreceptor; and a peripheral member capable of contacting a surface of the electrophotographic photoreceptor.
    Type: Grant
    Filed: April 29, 2020
    Date of Patent: November 30, 2021
    Assignee: KYOCERA CORPORATION
    Inventor: Yoshiaki Fujiwara
  • Patent number: 11188002
    Abstract: The present invention relates to an electrophotographic photoreceptor including a conductive support and a photosensitive layer on the conductive support, and the photosensitive layer contains a polymer A containing a repeating structural unit represented by a specific formula, and a polymer B containing a repeating structural unit represented by a specific formula. In addition, the present invention relates to an electrophotographic photoreceptor cartridge and an image forming apparatus including the electrophotographic photoreceptor.
    Type: Grant
    Filed: April 3, 2020
    Date of Patent: November 30, 2021
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takahiro Choda, Atsushi Yoshizawa
  • Patent number: 11181845
    Abstract: A toner comprising a toner particle that contains a binder resin, a resin represented by formula (1), and wax, wherein the wax contains an ester compound that exhibits a compatibility at 100° C. of at least 5.0 mass parts per 100.0 mass parts of the binder resin: wherein in formula (1), P1 represents a macromolecular segment; L1 represents a single bond or a divalent linking group; R1 to R3 each independently represent a hydrogen atom, halogen atom, alkyl group, alkoxy group, hydroxy group, or aryl group; m represents a positive integer; and when m is equal to or greater than 2, a plurality of L1's, a plurality of R1's, a plurality of R2's, and a plurality of R3's may be the same as or different from each other.
    Type: Grant
    Filed: April 21, 2020
    Date of Patent: November 23, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Taku Shimoda, Masashi Kawamura, Takayuki Toyoda, Kenji Ookubo
  • 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
  • Patent number: 11181841
    Abstract: A toner for electrostatic image development includes: toner particles; Si-doped strontium titanate particles; and silica particles. The particle diameter D of at least one peak in a number-based particle size distribution of primary particles of the silica particles is larger than the number-based median diameter D50 of primary particles of the Si-doped strontium titanate particles.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: November 23, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Moegi Iguchi, Yasuko Torii, Sakon Takahashi
  • Patent number: 11181839
    Abstract: A toner comprising a toner particle including a binder resin, wherein the toner is such that (1) when a powder dynamic viscoelasticity measurement method is used, a measurement start temperature is set to 25° C., and a ramp rate is set to 20° C./min, on a curve of a storage elastic modulus E? (Pa) where a temperature (° C.) is plotted against an abscissa and the storage elastic modulus E? is plotted against an ordinate, a temperature at a time when the E? at a start of a measurement has decreased by 50% is from 60° C. to 90° C., and (2) a load at a yield point of a displacement-load curve which is determined by a nanoindentation method and where a load (mN) is plotted against an ordinate and a displacement amount (?m) is plotted against an abscissa, is 0.80 mN or more; and a method for producing thereof.
    Type: Grant
    Filed: May 1, 2020
    Date of Patent: November 23, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Mariko Yamashita, Tetsuya Kinumatsu, Tomohiro Unno, Ryo Nagata, Kosuke Fukudome
  • Patent number: 11181843
    Abstract: An electrostatic-image developing toner includes toner particles, layered compound particles, and a free oil. The mass ratio Ma/Mb of the content Ma of the layered compound particles to the content Mb of the free oil is 0.05 or more and 100 or less.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: November 23, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Sakiko Takeuchi, Daisuke Noguchi, Yuka Yamagishi, Yutaka Saito, Kazuhiko Nakamura
  • Patent number: 11181840
    Abstract: A toner comprising a toner particle including a binder resin and a magnetic body, wherein in cross-sectional observation of the toner with a transmission electron microscope, where an area percentage occupied by the magnetic body in a region of 200 nm or less from a contour of a cross section of the toner particle to a centroid of the cross section is taken as A1, and an area percentage occupied by the magnetic body in a region of from 200 nm to 400 nm from the contour of the cross section of the toner particle to the centroid of the cross section is taken as A2, the area percentage A1 is from 38% to 85%, the area percentage A2 is from 0% to 37%, and a ratio A2/A1 of the area percentage A2 to the area percentage A1 is from 0 to 0.75.
    Type: Grant
    Filed: May 1, 2020
    Date of Patent: November 23, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ryo Nagata, Kosuke Fukudome, Tetsuya Kinumatsu, Tomohiro Unno, Mariko Yamashita
  • Patent number: 11181842
    Abstract: A two-component developer includes a toner including toner particles and a carrier including carrier particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes external additive particles. The external additive particles each include a base containing strontium titanate, a conductive layer covering the base, and a surface treatment layer either directly or indirectly covering the conductive layer. The surface treated layer contains a component derived from a hydrophobizing agent.
    Type: Grant
    Filed: February 4, 2020
    Date of Patent: November 23, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Ryota Kobayashi
  • Patent number: 11181844
    Abstract: A toner including a toner particle that contains a binder resin and inorganic fine particles, wherein the binder resin contains a polymer A that includes a first monomer unit derived from a first polymerizable monomer and a second monomer unit derived from a second polymerizable monomer that is different from the first polymerizable monomer; the first polymerizable monomer is at least one selected from the group consisting of (meth)acrylate esters having an alkyl group having 18 to 36 carbons; the SP value of the first monomer unit and the SP value of the second monomer unit satisfy a specified relationship; each of the inorganic fine particles contains a substrate containing at least one inorganic element selected from metal elements and metalloid elements, and a coating layer; and the coating layer has a specified structure.
    Type: Grant
    Filed: May 21, 2020
    Date of Patent: November 23, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tomoya Nagaoka, Daisuke Yoshiba, Kazuyuki Sato, Yuta Komiya, Tomohisa Sano, Takashi Matsui
  • Patent number: 11175600
    Abstract: A toner comprising a toner particle, wherein the toner particle includes a binder resin, where a volume resistivity ?·cm of an unfixed solid image on a recording material on which the solid image has been formed using the toner at a toner laid-on level of 0.4 mg/cm2 is denoted by Tv, and a volume resistivity ?·cm of the solid image after fixing by applying heat and pressure to the recording material is denoted by Fv, Tv/Fv?8 is satisfied.
    Type: Grant
    Filed: July 22, 2020
    Date of Patent: November 16, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Akihiko Uchiyama, Tetsuya Sano, Tomoaki Nakai, Takashi Kenmoku, Kenta Kamikura, Yuzo Seino
  • Patent number: 11169454
    Abstract: Provided an electrophotographic electro-conductive member that can stably suppress an occurrence of fogging in an electrophotographic image. The member comprises a support having an electro-conductive outer surface, and an electro-conductive layer on the outer surface of the support, the electro-conductive layer having a matrix including a cross-linked product of a first rubber, and domains dispersed in the matrix, the domains each includes a cross-linked product of a second rubber and an electro-conductive particle, at least some of the domains is exposed to the outer surface of the electro-conductive member to constitute protrusions on an outer surface of the member, the outer surface of the electro-conductive member is constituted by the matrix and the domains exposed to the outer surface of the electrophotographic electro-conductive member, the electrophotographic electro-conductive member has an impedance of 1.0×103? or more and 1.0×108? or less, and some of the domains satisfy two specific requirements.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: November 9, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Satoru Nishioka, Kazuhiro Yamauchi, Hiroaki Watanabe, Takumi Furukawa, Yasuhiro Fushimoto, Masahiro Kurachi, Kenji Takashima, Yuichi Kikuchi, Kana Sato
  • Patent number: 11169456
    Abstract: An electrophotographic photoreceptor includes a cured outermost layer that includes a polymerized cured product including at least an inorganic filler and a phenol derivative. The inorganic filler is surface-modified with a surface modifier. The phenol derivative has a structure represented by Formula (1). In Formula (1), R1 and R3 each independently represent an alkyl group having three or more carbon atoms, R2 and R4 each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and L1 represents a linking group having at least 10 atoms with an atomic number of 12 or more.
    Type: Grant
    Filed: April 15, 2020
    Date of Patent: November 9, 2021
    Assignee: KONICA MINOLTA, INC.
    Inventors: Mayuko Matsusaki, Tomoko Sakimura, Hiroki Takao, Kengo Ikeda
  • Patent number: 11169455
    Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoating layer, and a photosensitive layer. The undercoating layer that is provided on the conductive substrate and includes a binder resin and a charge transporting material. The binder resin includes a resin obtained by polymerizing a diallyl phthalate compound. The photosensitive layer that is provided on the undercoating layer.
    Type: Grant
    Filed: July 12, 2020
    Date of Patent: November 9, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Masahiro Iwasaki, Wataru Yamada, Kenji Kajiwara, Kota Maki
  • Patent number: 11169459
    Abstract: A resin particle set includes a fluorescent color resin particle containing a fluorescent coloring agent; and a colored resin particle containing a colored coloring agent, wherein a volume average particle diameter of the fluorescent color resin particles is larger than a volume average particle diameter of the colored resin particles, and an average circularity of the fluorescent color resin particles is 0.93 or more.
    Type: Grant
    Filed: July 13, 2020
    Date of Patent: November 9, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Tomoaki Tanaka, Tsuyoshi Murakami, Kana Yoshida
  • Patent number: 11156931
    Abstract: A positively charged toner for development of an electrostatic image, containing matrix particles containing at least a binder resin and a release agent, coated with inorganic fine particles, the binder resin containing a crystalline resin, the release agent containing ester wax (W) containing a dipentaerythritol unit as a constitutional component, the inorganic fine particles containing positively charged silica (S1) and negatively charged silica (S2), and the positively charged silica (S1) having an average particle diameter that is smaller than an average particle diameter of the negatively charged silica (S2), and the negatively charged silica (S2) having an average particle diameter of 10 nm or more and 90 nm or less.
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: October 26, 2021
    Assignee: KAO CORPORATION
    Inventor: Shogo Watanabe
  • Patent number: 11156932
    Abstract: The present invention relates to a toner binder containing: a polyester resin (A); and a vinyl resin (B), wherein the polyester resin (A) has an acid value of 2 mg KOH/g or more, the vinyl resin (B) has a weight average molecular weight of 4,000 to 40,000, the vinyl resin (B) is a polymer essentially containing a monomer (m) whose homopolymer has an SP value of 11.5 to 16.5 as a constituent monomer, the weight percentage of the monomer (m) in monomers constituting the vinyl resin (B) is 1 wt % or more based on the total weight of the monomers constituting the vinyl resin (B), the polyester resin (A) and the vinyl resin (B) are present at a weight ratio (A)/(B) of 80/20 to 99.5/0.
    Type: Grant
    Filed: November 6, 2018
    Date of Patent: October 26, 2021
    Assignee: SANYO CHEMICAL INDUSTRIES, LTD.
    Inventors: Masaru Honda, Tomohisa Kato, Yasuhiro Ono
  • Patent number: 11156933
    Abstract: Provided is an image forming method, including: transferring and fixing a toner onto a recording medium, and forming an image including a plurality of layers, in which an attachment amount of the toner on the recording medium is greater than or equal to 8 g/m2 and less than or equal to 40 g/m2, a toner forming a layer in contact with a fixing member contains at least a first mold release agent containing ester wax and a second mold release agent containing microcrystalline wax, and a special color toner is contained in any layer of the plurality of layers.
    Type: Grant
    Filed: April 21, 2020
    Date of Patent: October 26, 2021
    Assignee: KONICA MINOLTA, INC.
    Inventors: Keisuke Asano, Shiro Hirano, Kazuhiko Nakajima
  • Patent number: 11150566
    Abstract: The present disclosure provides an electrophotographic photosensitive member that can simultaneously achieve the suppression of the occurrence of the black spot in a charged portion and the suppression of the deterioration in sensitivity of an exposed portion, even after stored in a high-temperature and high-humidity environment. An electrophotographic photosensitive member includes an electro-conductive support, an undercoat layer, a charge generation layer and a charge transport layer in this order, wherein an atomic concentration ratio R of the oxygen atom to the aluminum atom on the surface of the electro-conductive support, as measured by energy dispersive X-ray spectroscopy, satisfies the following Expression (1): 1.6?R??(1) and the undercoat layer includes a titanium oxide particle that is surface-treated with a particular silane compound.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: October 19, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shuhei Iwasaki, Akira Sakakibara, Jumpei Kuno, Yota Ito, Kohei Makisumi