Patents Examined by Christopher D. Rodee
  • Patent number: 11119422
    Abstract: A toner includes toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive. The external additive includes resin particles. The toner mother particles have a chargeability opposite to a chargeability of the resin particles. Each of the resin particles has an embedded portion embedded in a surface portion of the toner mother particle and a protruding portion protruding outward from the toner mother particle in a radial direction of the toner mother particle. In a cross section of the resin particle, a relationship 0.60?LA/(LA+LB)?0.80 is satisfied where LA represents a maximum length of the embedded portion in the radial direction of the toner mother particle and LB represents a maximum length of the protruding portion in the radial direction of the toner mother particle.
    Type: Grant
    Filed: November 19, 2019
    Date of Patent: September 14, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Sho Sumioka
  • Patent number: 11112707
    Abstract: The electrophotographic photosensitive member includes: a support; a charge-generating layer; and a charge-transporting layer, the charge-generating layer and the charge-transporting layer being arranged on the support, wherein a surface layer of the electrophotographic photosensitive member contains: inorganic particles having an average particle diameter (L?) of primary particles of 5 nm or more and 50 nm or less; and resin particles having an average particle diameter (L?) of primary particles of 0.1 ?m or more and 5.0 ?m or less, and wherein in any cross-section of the surface layer, “(Sm?)/(S?)?0.3” is satisfied, where a region within (L?/2) from a surface of each of the resin particles is defined as a region (M), a sum of cross-sectional areas of the inorganic particles in the any cross-section is represented by (S?), and a sum of cross-sectional areas of the inorganic particles that are included in the region (M) is represented by (Sm?).
    Type: Grant
    Filed: January 17, 2020
    Date of Patent: September 7, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koji Takahashi, Akifumi Matsubara, Yuya Chimoto
  • Patent number: 11112708
    Abstract: A toner comprising a toner particle including a binder resin and a colorant and an external additive, wherein the external additive contains an external additive A having a Feret diameter of 60 to 200 nm, the external additive A is inorganic fine particles or organic-inorganic composite fine particles, adhesion index of the external additive A to the toner is 0.00 to 3.00, and penetration depth b and protrusion height c satisfy Relational expressions (1) and (2) below, where b (nm) denotes penetration depth of the external additive A, at a portion of the external additive A penetrating into the toner particle interior from the surface thereof, and c (nm) denotes a protrusion height of the external additive A at that portion, in an observation of an image resulting from image processing of a cross section of the toner using TEM; 60?b+c?200??(1), 0.15?b/(b+c)?0.30??(2).
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: September 7, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kozue Uratani, Daisuke Yoshiba, Shohei Tsuda, Tomoya Nagaoka, Mariko Yamashita, Kazuki Kaneko, Ryo Nagata
  • Patent number: 11112713
    Abstract: A toner including a toner particle containing a binder resin, wherein the binder resin contains a crystalline resin, and in viscoelasticity measurement of the toner with Tp being a peak temperature of an endothermic peak derived from the crystalline resin in DSC of the toner, given G?(Tp?5, 0.01 Hz) as a storage modulus at a temperature of Tp?5° C. and a frequency of 0.01 Hz, G?(Tp?5, 10 Hz) as a storage modulus at a temperature of Tp?5° C. and a frequency of 10 Hz, and G?(Tp?30, 10 Hz) as a storage modulus at a temperature of Tp?30° C. and a frequency of 10 Hz, the following formulae are satisfied: G?(Tp?30,10 Hz)/G?(Tp?5,0.01 Hz)?1.40 G?(Tp?5,10 Hz)/G?(Tp?5,0.01 Hz)?2.20.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: September 7, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hiroki Akiyama, Shuhei Moribe, Hiroyuki Tomono, Tatsuya Saeki, Hiroki Kagawa, Atsuhiko Ohmori, Katsuhisa Yamazaki
  • Patent number: 11106150
    Abstract: A carrier for forming an electrophotographic image is provided. The carrier includes a core particle comprising a manganese-based ferrite particle having an apparent density of from 2.0 to 2.2 g/cm3 and a magnetization of from 44 to 52 emu/g in a magnetic field of 500 Oe; and a coating layer coating a surface of the core particle. The coating layer contains a carbon black, an inorganic particle A, and an inorganic particle B. The inorganic particle A and the carbon black each have a concentration gradient in a thickness direction of the coating layer. A concentration of the inorganic particle A increases toward a surface of the coating layer, and a concentration of the carbon black decreases toward the surface of the coating layer.
    Type: Grant
    Filed: November 14, 2019
    Date of Patent: August 31, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Masashi Nagayama, Hiroyuki Kishida, Masahiro Seki, Yoshimichi Ishikawa, Saori Yamada
  • Patent number: 11099494
    Abstract: Provided is a magenta toner which is more excellent in durability in a high temperature and high humidity environment than conventional ones. The magenta toner comprises a binder resin, a magenta colorant, a release agent and an external additive. The release agent has a maximum endothermic peak in a range of from 70° C. to 80° C. during temperature increase, in a DSC curve measured by a differential scanning calorimeter. Needle-shaped oxide fine particles having an average long diameter of from 30 nm to 500 nm and an aspect ratio of from 4 to 20 are contained therein. Zinc stearate particles having a number average primary particle diameter of from 0.1 ?m to 5 ?m are contained at an amount of from 0.01 part by mass to 0.5 part by mass with respect to 100 parts by mass of the colored resin particles, as the external additives.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: August 24, 2021
    Assignee: ZEON CORPORATION
    Inventors: Mayuka Chiba, Hiroshi Nakatani
  • Patent number: 11099492
    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-containing resin particle and a fluorine-based graft polymer having a fluorinated alkyl group. A ratio of an amount of a fluorine-based graft polymer separated from the fluorine-containing resin particle to a total amount of the fluorine-based graft polymer in the outermost surface layer is 15% or less.
    Type: Grant
    Filed: January 16, 2020
    Date of Patent: August 24, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Keisuke Kusano, Wataru Yamada, Masahiro Iwasaki, Ryosuke Fujii, Yuto Okazaki, Taisuke Fukui
  • Patent number: 11092904
    Abstract: A single-layer photosensitive layer of an electrophotographic photosensitive member contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The charge generating material is a phthalocyanine pigment. A content percentage of the phthalocyanine pigment relative to the mass of the photosensitive layer is at least 0.70% by mass and no greater than 1.40% by mass. A film thickness of the photosensitive layer is at least 25 ?m and no greater than 32 ?m. A charge amount difference ?Q is no greater than 6.50 ?C.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: August 17, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tomofumi Shimizu
  • Patent number: 11086242
    Abstract: The toner has a toner particle that contains a binder resin, wherein the binder resin contains a styrene-acrylic resin that has a structure derived from a crosslinking agent, the binder resin includes tetrahydrofuran-insoluble matter in an amount of from 5 mass % to 60 mass % of the binder resin, and the crosslinking agent contains a polymeric compound provided by an addition reaction at least between a particular multifunctional (meth)acrylate compound and a particular polyvalent mercapto compound.
    Type: Grant
    Filed: October 24, 2019
    Date of Patent: August 10, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Naoya Isono, Keiichiro Tsubaki, Yasuaki Murai
  • Patent number: 11079693
    Abstract: An electrophotographic photoreceptor includes: a conductive substrate; an undercoating layer that contains inorganic particles surface-treated with a surface treatment agent, and is provided in contact with an outer peripheral surface of the conductive substrate; and a photosensitive layer provided on the undercoating layer, wherein, with respect to the outer peripheral surface of the conductive substrate, a proportion of an area being in contact with the inorganic particles is from 82% to 91%.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: August 3, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventor: Eri Kunisawa
  • Patent number: 11067914
    Abstract: The present disclosure discloses a liquid electrophotographic ink. The ink can include (A) a liquid vehicle; (B) at least one colorant; (C) a resin comprising an ethylene acid copolymer; (D) an ethylene/(meth)acrylic acid C1-10 alkyl ester copolymer selected from the group consisting of an ethylene/methyl acrylate copolymer and an ethylene/butyl acrylate copolymer; and (E) a condensation product of urea and aldehyde.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: July 20, 2021
    Assignee: HP Indigo B.V.
    Inventors: Getahun Biadglin, Emad Masoud, Reut Avigdor, Albert Teishev, Tehila Ben-Ezra, Igor Shutyi, Hanit Marom Tchaicheeyan
  • Patent number: 11067909
    Abstract: A compound is represented by general formula (1). In general formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom, a methyl group, or an ethyl group, and a sum of the number of carbon atoms of the chemical group represented by R1 and the number of carbon atoms of the chemical group represented by R2 is 2. R3 and R4 each represent, independently of one another, a hydrogen atom, a methyl group, or an ethyl group, and a sum of the number of carbon atoms of the chemical group represented by R3 and the number of carbon atoms of the chemical group represented by R1 is 2. A photosensitive layer of an electrophotographic photosensitive member contains at least a charge generating material, a hole transport material, and a binder resin.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: July 20, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Kensuke Kojima, Tomofumi Shimizu, Hideki Okada
  • Patent number: 11061341
    Abstract: An electrophotographic photosensitive member includes, in sequence, a support, a conductive layer, an undercoat layer, a charge generation layer, and a charge transport layer. The conductive layer is a cured film, and the cured film contains titanium oxide particles doped with niobium. The undercoat layer contains a cured product of a composition that contains an electron transport material having a polymerizable functional group and a resin functionalized with a carboxylic acid derivative.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: July 13, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masashi Nishi, Takashi Anezaki, Taichi Sato, Atsushi Fujii, Kunihiko Sekido
  • Patent number: 11048184
    Abstract: A toner process including a) mixing reagents comprising at least one amorphous resin, an optional crystalline resin, an optional styrene, acrylate or styrene/acrylate, an optional wax, and an optional colorant to form an emulsion comprising a resin particle; b) adding at least one aggregating agent and aggregating said resin particle to form a nascent toner particle; c) optionally, adding one or more resins to form a shell on said nascent toner particle to yield a core-shell particle; d) adding a first chelating agent and a second chelating agent; wherein said first chelating agent and said second chelating agent are different; e) freezing particle growth to form an aggregated toner particle; f) coalescing said aggregated toner particle to form a toner particle; and g) optionally, collecting said toner particle.
    Type: Grant
    Filed: January 14, 2019
    Date of Patent: June 29, 2021
    Assignee: Xerox Corporation
    Inventors: Shivanthi Easwari Sriskandha, Richard P. N. Veregin, Guerino G. Sacripante, Edward G. Zwartz, Michael Steven Hawkins
  • Patent number: 11036155
    Abstract: A toner for electrostatic image development contains: toner base particles containing at least a nonionic surfactant, a binder resin, and a release agent; and an external additive. The content of the nonionic surfactant is from 0.05% by mass to 1% by mass inclusive based on the total mass of the toner, and the external additive contains tin oxide particles.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: June 15, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Kazutsuna Sasaki, Yutaka Saito, Kazuhiko Nakamura, Yuka Yamagishi
  • Patent number: 11029618
    Abstract: There is provided a carrier including a magnetic core material having a surface coated with a surfactant-containing resin mixture of an elemental fluorine-containing resin and a polyimide resin. The carrier has an elution amount of an eluted material into water in an elution test ranging from 180 ppm to 3,500 ppm.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: June 8, 2021
    Assignee: POWDERTECH CO., LTD.
    Inventors: Aya Sakuta, Makoto Ishikawa, Hiroki Sawamoto, Tetsuya Uemura
  • 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
  • Patent number: 11001662
    Abstract: A composition including a three-dimensional polymeric printing powder; an organic polymeric additive on at least a portion of an external surface of the three-dimensional polymeric printing powder; wherein the organic polymeric additive is optionally cross-linked; and optionally, an inorganic additive on at least a portion of an external surface of the three-dimensional polymeric printing powder. A process for preparing a three-dimensional polymeric printing powder having an organic polymeric additive disposed thereon. A process for employing the three-dimensional polymeric printing powder including selective laser sintering.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: May 11, 2021
    Assignee: Xerox Corporation
    Inventors: Richard P. N. Veregin, Nan-Xing Hu, Karen A. Moffat, Michael Steven Hawkins
  • Patent number: 11003104
    Abstract: Provided is a toner including a toner particle and an external additive, wherein the external additive includes a composite particle including a hydrotalcite particle covered on the surface with an organosilicon polymer fine particle, a coverage ratio of the hydrotalcite particle surface by the organosilicon polymer fine particle is from 1% to 50%, and given A (nm) as the number-average particle diameter of the primary particles of the organosilicon polymer fine particle and B (nm) as the number-average particle diameter of the primary particles of the hydrotalcite particle, the toner satisfies the following formula (I) and formula (II): A<B??(I) 20?A?350??(II).
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: May 11, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Taiji Katsura, Masamichi Sato, Shohei Kototani, Kentaro Yamawaki, Tsuneyoshi Tominaga, Masatake Tanaka
  • Patent number: 10996576
    Abstract: Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charge characteristics and strength and with which a satisfactory image free from defects can be obtained, and a developer containing the carrier. A magnetic core material for electrophotographic developer, having a sulfur component content of from 50 to 700 ppm in terms of a sulfate ion and a BET specific surface area of from 0.06 to 0.25 m2/g.
    Type: Grant
    Filed: December 25, 2017
    Date of Patent: May 4, 2021
    Assignee: POWDERTECH CO., LTD.
    Inventors: Hiroki Sawamoto, Tetsuya Uemura