Patents Examined by Mark A. Chapman
  • Toner and two-component developer
    Patent number: 10859931
    Abstract: A toner having an inorganic fine particle and a toner particle containing a binder resin, wherein the binder resin contains a polymer A having 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 selected from the (meth)acrylic acid esters each having a C18-36 alkyl group, the content of the first monomer unit in the polymer A is within a specific range, the SP value of the first monomer unit and the SP value of the second monomer unit are in a specific relationship to one another, the inorganic fine particle is surface treated with a compound having an alkyl group, and the volume resistivity of the inorganic fine particle is within a specific range.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: December 8, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takeshi Hashimoto, Kentaro Kamae, Kazuhisa Shirayama, Hayato Ida, Takashi Matsui
  • Magnetic toner
    Patent number: 10859933
    Abstract: A magnetic toner comprising a magnetic toner particle including a binder resin, a magnetic body and a crystalline polyester, wherein the dielectric loss tangent at 100 kHz is 1.0×10?2 or more, a variation coefficient CV3 of an occupied area ratio of the magnetic body when a cross section of the magnetic toner particle is divided by a square grid having a side of 0.8 ?m in cross-sectional observation of the magnetic toner particle using a transmission electron microscope TEM is from 30.0% to 80.0%, and where a storage elastic modulus of the magnetic toner at 40° C. is taken as E?(40) [Pa] and a storage elastic modulus of the magnetic toner at 85° C. is taken as E?(85) [Pa], the following formulas (1) and (2) are satisfied: E?(85)?5.5×109??(1) [E?(40)?E?(85)]×100/E?(40)?30??(2).
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: December 8, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tetsuya Kinumatsu, Kosuke Fukudome, Yusuke Hasegawa
  • Toner
    Patent number: 10852652
    Abstract: A toner containing a toner particle, in which the toner particle contains a binder resin and a pigment, and As and Al satisfy a specific relation, in a case when the toner is divided into two groups i.e. a first group and a second group with an inertial classifier, the first group including a larger size of the toner particles, and the second group including a smaller size of the toner particles, and the number of the toner particles in the first group being substantially equal to the number of the toner particles in the second group. Each of As and Al is a change rate of a surface potential of a pellet type molded product obtained by molding each of the toner in the first group and the toner in the second group under specific conditions is observed using a surface potentiometer under a specific conditions.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: December 1, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Yamashita, Masaharu Miura, Takaho Shibata, Wakiko Katsumata, Yuichi Mizo
  • Toner and method for producing the toner
    Patent number: 10852650
    Abstract: A toner has a toner particle including a binder resin, a colorant, and a wax, in which in a cross section of the toner particle observed under a scanning transmission electron microscope, a proportion of the number of toner particles having a void with a long diameter of 0.50 ?m or less is 60 number % or more, and a proportion of the number of toner particles having a void in a region from an outline of the cross section of the toner particle inward to 1.00 ?m in a total number of the toner particles having a void is 30 number % or less.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: December 1, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koki Inoue, Takeshi Tsujino, Yasuhiro Hashimoto, Junya Asaoka, Yuu Sasano, Kenta Katayama, Shota Amano
  • Carrier and two-component developer
    Patent number: 10852654
    Abstract: A carrier includes carrier particles. The carrier particles include first carrier particles and second carrier particles. The first carrier particles each include a first carrier core and a first coat layer covering a surface of the first carrier core. The second carrier particles each include a second carrier core and a second coat layer covering a surface of the second carrier core. The first coat layers contain no fatty acid metal salt. The second coat layer contains a coat layer binder resin and a fatty acid metal salt. The second coat layers contain the fatty acid metal salt in a proportion of from 85 mass % to 95 mass % relative to a total mass of the second coat layers. The second carrier particles are contained in a proportion of from 7 mass % to 15 mass % relative to a total mass of the first carrier particles and the second carrier particles.
    Type: Grant
    Filed: November 5, 2019
    Date of Patent: December 1, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Kohei Terasaki
  • Electrostatic-image developer and process cartridge
    Patent number: 10852651
    Abstract: An electrostatic-image developer includes a toner and a resin-coated carrier. The toner includes toner particles including a binder resin, a release agent, and a non-ionic surfactant. The resin-coated carrier includes magnetic particles and a resin layer covering the magnetic particles. The resin layer includes inorganic particles having a volume resistivity of 1×100 ?·cm or more and 1×104 ?·cm or less.
    Type: Grant
    Filed: August 14, 2019
    Date of Patent: December 1, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yasuaki Hashimoto, Yosuke Tsurumi, Hiroaki Saijo
  • Magnetic carrier, two-component developer, developer for replenishment, and image forming method
    Patent number: 10852653
    Abstract: A magnetic carrier includes a magnetic carrier particle including a magnetic carrier core particle having an amino group on a surface thereof and a resin covering layer disposed on the surface of the magnetic carrier core particle, in which the resin covering layer contains a vinyl-based copolymer and a trialkoxyalkylsilane.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: December 1, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ryuichiro Matsuo, Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida
  • Toner and method for producing toner
    Patent number: 10845722
    Abstract: A toner comprising an external additive and a toner particle including a binder resin, a colorant and inorganic fine particles A, wherein the external additive contains an external additive B, a number average particle diameter of primary particles of the external additive B is 30 to 200 nm, an adhesion index of the external additive B to the toner particle is 0.00 to 3.00, a number average particle diameter of primary particles of the inorganic fine particles A is greater than that of the external additive B, and in SEM observations of the toner under specific condition, the number of particles (Na) of the external additive B in a 2 ?m square region of the toner surface and the number of particles (Nb) of the external additive B observed in a state of overlapping with the inorganic fine particles A in the region satisfy Nb/Na of 0.20 or more.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: November 24, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koji Nishikawa, Kosuke Fukudome, Takaaki Furui, Tetsuya Kinumatsu
  • Magnetic carrier, two-component developer, replenishing developer, and image forming method
    Patent number: 10838317
    Abstract: A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and based on the resin components of the resin coating layer, the amount of the resin A is from 20% by mass to 99% by mass, and the amount of the resin B is from 1% by mass to 80% by mass.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: November 17, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Nobuyoshi Sugahara, Ryuichiro Matsuo, Hironori Minagawa, Wakashi Iida
  • Image forming apparatus
    Patent number: 10838316
    Abstract: An image forming apparatus in which occurrence of an image failure in association with contamination caused by an external additive, such as silica, adhering to a charging unit is suppressed. The image forming apparatus is configured to charge an image bearing member through use of the charging unit, and uses toner having, on a surface thereof, strontium titanate particles and silica particles having predetermined physical properties.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: November 17, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Akinori Miyamoto, Kota Mori, Masami Hano, Takashi Kase, Tadashi Fukuda, Mikihiro Akasaki, Takeshi Ohtsu
  • Electrophotographic photosensitive member and method for producing electrophotographic photosensitive member
    Patent number: 10831118
    Abstract: A method for producing an electrophotographic photosensitive member having a photosensitive layer and a protective layer above a support in this order includes: forming a coating film for a protective layer by coating a coating liquid for the protective layer for forming the protective layer on the photosensitive layer and curing the coating film for the protective layer, in which the coating liquid for the protective layer contains a solvent, a compound represented by a general formula (1), a compound represented by a general formula (2), and a compound represented by a general formula (3) at a specific ratio. In addition, in an electrophotographic photosensitive member having a photosensitive layer and a protective layer above a support in this order, the protective layer is obtained by curing a coating liquid for the protective layer.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: November 10, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Hiroyuki Watanabe, Tsutomu Nishida, Yuka Ishiduka, Atsushi Okuda, Hideharu Shimozawa, Nobuhiro Nakamura, Koichi Nakata, Haruki Mori, Kenichi Kaku
  • Electrostatic-image developer and process cartridge
    Patent number: 10831119
    Abstract: An electrostatic-image developer includes a toner and a resin-coated carrier. The toner includes toner particles including a binder resin, a release agent, and a non-ionic surfactant. The resin-coated carrier includes magnetic particles and a resin layer covering the magnetic particles. The resin-coated carrier has an absolute specific gravity of 3 g/cm3 or more and 4 g/cm3 or less.
    Type: Grant
    Filed: August 13, 2019
    Date of Patent: November 10, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yosuke Tsurumi, Yasuaki Hashimoto, Hiroaki Saijo
  • Toner
    Patent number: 10809639
    Abstract: A toner having a toner particle including a binder resin and a wax, wherein the wax includes a specific diester compound; a proportion As of an area occupied by the wax in a region from a surface of the toner particle to 0.5 ?m is 15.0% or less; wax domains are observed in the cross section of the toner particle, and an average number of the domains per cross section of one toner particle is from 10 to 2000; when a mass concentration of a polyvalent metal element in the toner particle determined by fluorescent X-ray analysis is denoted by Mi (ppm), Mi is from 3.5 ppm to 1100 ppm; and when a mass concentration of a polyvalent metal element in the toner particle determined by X-ray photoelectron spectroscopy is denoted by Ms (ppm), Mi>Ms.
    Type: Grant
    Filed: October 31, 2019
    Date of Patent: October 20, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kentaro Yamawaki, Satoshi Otsuji, Masamichi Sato, Hidekazu Fumita
  • Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge
    Patent number: 10795274
    Abstract: An electrostatic charge image developing toner includes a continuous phase containing a binder resin (i); and a discontinuous phase that has a core containing a binder resin (ii) and a coating layer covering the core and containing a binder resin (iii), and is dispersed in the continuous phase.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: October 6, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shinya Nakashima, Shinya Sakamoto, Tomohiro Shinya, Naomi Miyamoto, Masaki Iwase, Ryutaro Kembo, Tomohito Nakajima
  • Toner
    Patent number: 10768543
    Abstract: A toner having a toner particle, which contains a binder resin, and inorganic fine particles, the toner being characterized in that the binder resin contains a polyester resin, the polyester resin has, at a terminal, an alkyl group having an average number of carbon atoms of from 4 to 102, the number average particle diameter of primary particles of the inorganic fine particles is from 10 to 90 nm, the dielectric constant of the inorganic fine particles is from 55.0 to 100.0 pF/m, as measured at 25° C. and 1 MHz, and the inorganic fine particles are surface-treated with an alkylalkoxysilane represented by formula (1) below: CnH2n+1—SiOCmH2m+1)3??(1) in formula (1), n denotes an integer of from 4 to 20, and m denotes an integer of from 1 to 3.
    Type: Grant
    Filed: August 26, 2019
    Date of Patent: September 8, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daisuke Tsujimoto, Toru Takahashi, Hiroki Watanabe, Yoshihiro Ogawa, Wakashi Iida
  • Electrostatic charge image development toner and electrostatic charge image developer
    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
  • Naphthol as-pigments
    Patent number: 10752779
    Abstract: Naphthol AS-pigments of formula (I), wherein R1 represents methyl or C3-C8-alkyl; R2 represents hydrogen or C1-C4-alkyl; Y represents C1-C4-alkyl or C1-C4-alkoxy; and Z? represents hydrogen, phenyl, naphthyl, or substituted phenyl or substituted naphthyl, wherein the number of substituents can be 1, 2, 3 or 4 and are selected from the group consisting of halogen, nitro, cyano, C1-C4-alkoxycarbonyl, carbamoyl, C1-C4-alkylcarbamoyl, di(C1-C4)-alkylcarbamoyl, phenylcarbamoyl, sulfamoyl, phenylsulfannoyl, C1-C4-alkylsulfamoyl, di(C1-C4)-alkylsulfamoyl, C1-C4-acylamino, C1-C4-alkyl and C1-C4-alkoxy.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: August 25, 2020
    Assignee: Clariant Plastics & Coatings Ltd
    Inventors: Ulrike Rohr, Joachim Eichhorn
  • Toner for electrostatic image development, electrostatic image developer, and toner cartridge
    Patent number: 10754268
    Abstract: A toner for electrostatic image development includes: a binder resin; and a coloring agent. When an image with a toner mass per unit area of 4.0 g/m2 is formed using the toner, the image has a color that satisfies the following conditions (A), (B), and (C): (A) L* is from 37 to 50 inclusive; (B) a* is from ?12 to 8 inclusive; and (C) b* is from ?49 to ?40 inclusive.
    Type: Grant
    Filed: July 19, 2019
    Date of Patent: August 25, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Tsutomu Furuta, Masaru Takahashi
  • Electrostatic-image developing toner, electrostatic-image developer, and toner cartridge
    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
  • Toner, production method of toner, image forming method, image forming apparatus, and process cartridge
    Patent number: 10754270
    Abstract: Provided is a toner including a binder resin, and a charge-controlling agent, wherein a volume average particle diameter X of the toner after a stress treatment satisfies Formula (1), and an amount Y of fine toner particles having particle diameters of 3 micrometers or smaller and circularity of 0.70 or less satisfies Formula (2).
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: August 25, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Naoko Kitada, Satoshi Ogawa, Yoshitaka Sekiguchi, Masayuki Ishii, Shohta Kobayashi