Patents Examined by Boone Alexander Evans
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Patent number: 12259681Abstract: Provided are an electrophotographic photoconductor that is less likely to cause transfer ghosting even when mounted in an electrophotographic apparatus with high transfer voltage set for high-speed or cleanerless processes, as well as a method of manufacturing the electrophotographic photoconductor, and an electrophotographic apparatus. The electrophotographic photoconductor includes a conductive substrate; an undercoat layer provided on the conductive substrate, and a photosensitive layer provided on the undercoat layer. In the electrophotographic photoconductor, the undercoat layer contains a resin binder and a first filler; and the first filler contains zinc oxide particles that are surface-treated with an N-acylated amino acid or an N-acylated amino acid salt.Type: GrantFiled: January 3, 2022Date of Patent: March 25, 2025Assignee: FUJI ELECTRIC CO., LTD.Inventors: Fengqiang Zhu, Shinjiro Suzuki, Masaru Takeuchi, Kazuki Nebashi
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Patent number: 12259682Abstract: A toner including a toner particle containing a binder resin and an ester compound, wherein the binder resin contains a styrene-acrylic-based resin, the styrene-acrylic-based resin contains a specific unit, the ester compound has a specific structure, and a molar ratio of the specific unit to the ester compound is 0.5 to 1.5.Type: GrantFiled: December 13, 2021Date of Patent: March 25, 2025Assignee: CANON KABUSHIKI KAISHAInventors: Kozue Uratani, Kenta Kamikura, Kosuke Fukudome, Tetsuya Kinumatsu, Takuya Mizuguchi, Yuta Komiya
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Patent number: 12253823Abstract: The present invention relates to an electrophotographic photoreceptor having a plurality of layers containing at least one outermost layer, wherein at least one of the outermost layer contains a polymer having a first structure where at least one carbonyl group is bonded to an aromatic group and a second structure represented by Formula (A).Type: GrantFiled: October 20, 2021Date of Patent: March 18, 2025Assignee: Mitsubishi Chemical CorporationInventors: Akira Ando, Atsushi Yoshizawa
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Patent number: 12253824Abstract: A toner comprising a toner particle and a silica particle on a surface of the toner particle, wherein an area formed by a polyester resin and an area formed by a styrene-acrylic resin are present on the surface of the toner particle; the silica particle has the number-average particle diameter of 15 to 60 nm; the silica particle has the average pore diameter of 5.0 to 20.0 nm; and the silica particle has the total pore volume of 0.20 to 1.50 cm3/g.Type: GrantFiled: September 3, 2021Date of Patent: March 18, 2025Assignee: CANON KABUSHIKI KAISHAInventors: Kenichi Nakayama, Naoya Isono, Yoshiaki Shiotari, Hirofumi Kyuushima
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Patent number: 12253825Abstract: The present invention relates to a ferrite particle, containing a crystal phase component containing a perovskite crystal represented by the compositional formula: RZrO3 (provided that R represents an alkaline earth metal element), and having an apparent density in a range represented by the following formula: 1.90?Y?2.45 provided that Y in the formula is the apparent density (g/cm3) of the ferrite particle.Type: GrantFiled: February 20, 2020Date of Patent: March 18, 2025Assignee: POWDERTECH CO., LTD.Inventors: Makoto Ishikawa, Tetsuya Uemura
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Patent number: 12235606Abstract: A process cartridge includes a photosensitive member, a toner, and a developing roller, a surface layer of the photosensitive member has a Martens hardness of 245 to 300 N/mm2, the developing roller has a single-layered surface layer containing a substrate and a binder resin; when an elastic modulus of the binder resin in a first region is E1, and an elastic modulus of the binder resin in a second region is E2, E1?200 MPa and 10 MPa?E2?150 MPa are satisfied; the elastic modulus in the second region continuously decreases from that in the first region; the toner comprises a toner particle and an external additive A; the external additive A is a silica particle having a major diameter of 40 to 400 nm; and a coverage of the external additive A with respect to surface of the toner particle is 5.0% or more.Type: GrantFiled: September 21, 2021Date of Patent: February 25, 2025Assignee: CANON KABUSHIKI KAISHAInventors: Masatake Tanaka, Tomoya Uesugi, Shintaro Kawaguchi, Masamichi Sato
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Patent number: 12228884Abstract: A resin binder composition for toners, containing a polyester resin A having a constituting unit derived from an alcohol component containing an alkylene oxide adduct of bisphenol A and a constituting unit derived from a carboxylic acid component containing an amorphous acid modified product A of an ?-olefin polymer having 4 or more carbon atoms and 18 or less carbon atoms; a resin binder composition for toners containing a polyester resin A which is a polycondensate of an alcohol component containing an alkylene oxide adduct of bisphenol A and a carboxylic acid component containing an amorphous acid modified product A of an ?-olefin polymer having 4 or more carbon atoms and 18 or less carbon atoms; and a toner for electrostatic image development, containing these resin binder composition for toners.Type: GrantFiled: April 30, 2020Date of Patent: February 18, 2025Assignee: Kao CorporationInventors: Kota Ijichi, Kunihiro Kano, Nobumichi Kamiyoshi, Akitaka Mitsuji
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Patent number: 12222677Abstract: A fine particle of a silicon polymer having a siloxane group and a silanol group, wherein a moisture adsorption amount of the fine particle at a temperature of 30° C. and a humidity of 80% RH is from 1.0 mg/g to 22.0 mg/g, an amount of the silanol group of the fine particle measured by a titration method using KOH is from 0.012 mmol/g to 0.120 mmol/g, and a number average particle diameter of primary particle of the fine particle is from 0.05 ?m to 0.30 ?m.Type: GrantFiled: January 19, 2022Date of Patent: February 11, 2025Assignee: CANON KABUSHIKI KAISHAInventors: Hiroki Watanabe, Ichiro Kanno, Masaharu Miura, Hayato Ida
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Patent number: 12204280Abstract: The present invention relates to a carrier including: a magnetic core material; and a resin coating layer coating a surface of the magnetic core material, in which the resin coating layer contains a binder resin, and fluorine element-containing resin particles dispersed in the binder resin, the resin coating layer has a coefficient of variation of a film thickness of 25% or less, and the resin coating layer has an average value of the number of the fluorine element-containing resin particles being 3 particles/?m2 or more and 350 particles/?m2 or less per unit area in a cross section of the resin coating layer, and has a coefficient of variation thereof being 20% or less.Type: GrantFiled: February 13, 2020Date of Patent: January 21, 2025Assignee: POWDERTECH CO., LTD.Inventors: Aya Sakuta, Makoto Ishikawa, Hiroki Sawamoto, Tetsuya Uemura
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Patent number: 12204279Abstract: A toner based on fly-ash rich carbon and method of producing are disclosed. The process includes preparing a latex and preparing a pigment including fly ash, where the fly ash has been ground to nanoparticle size. The latex, pigment including fly ash, and polyethylene wax are combined in an emulsion aggregation process. The latex is formed by a mixing process including combining ammonium bicarbonate, sodium dodecylbenzene sulfonate, styrene, acrylic acid, and methyl methacrylate. The emulsion aggregation process includes steps of dispersing a mixture of the polyethylene wax, pigment including fly ash, and latex in water, adding zinc oxide, nitric acid, adding Ethylenediaminetetraacetic acid (EDTA), elevating the temperature, neutralizing the product mixture with NaOH solution and cooling the mixture, Centrifuging, washing and drying are performed to achieve a finished toner which includes fly ash pigment, polyethylene wax, poly(styrene-methyl methacrylate-acrylic acid) latex, zinc oxide and a chelating agent.Type: GrantFiled: February 8, 2024Date of Patent: January 21, 2025Assignee: KING SAUD UNIVERSITYInventors: Seham Soliman Alterary, Athar Mohamed Elhadi
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Patent number: 12189334Abstract: An electrostatic charge image developing toner includes a toner particle that contains a binder resin having an acid value of 5 mgKOH/g or more and 25 mgKOH/g or less, and a pigment having an isoindoline skeleton, in which a total Net intensity NA of an alkali metal and an alkaline earth metal, which is measured by fluorescent X-ray analysis, in the toner particle is 1.50 kcps or more and 4.00 kcps or less.Type: GrantFiled: October 13, 2021Date of Patent: January 7, 2025Assignee: FUJIFILM Business Innovation Corp.Inventors: Satoshi Miura, Yoshimasa Fujihara, Atsushi Sugawara, Shintaro Anno, Daisuke Noguchi
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Patent number: 12181836Abstract: An electrostatic charge image developing carrier, contains: a magnetic particle; and a coating resin layer coating the magnetic particle and containing inorganic particles, in which an area ratio of the inorganic particles that is a ratio of a total area of the inorganic particles to an area of the coating resin layer in a cut surface of the coating resin layer along a thickness direction of the coating resin layer is 10% or more and 50% or less.Type: GrantFiled: July 27, 2021Date of Patent: December 31, 2024Assignee: FUJIFILM Business Innovation Corp.Inventors: Yasuo Kadokura, Yosuke Tsurumi, Takuro Watanabe, Kazutsuna Sasaki, Karin Sakai
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Patent number: 12174583Abstract: An electrostatic charge image developing carrier includes a magnetic particle and a coating resin layer that covers the magnetic particle and contains a silica particle, and a ratio of Si on a surface of the coating resin layer, determined by an X-ray photoelectron spectroscopy (XPS), is 6 atom % or more and 12 atom % or less.Type: GrantFiled: August 24, 2021Date of Patent: December 24, 2024Assignee: FUJIFILM Business Innovation Corp.Inventors: Takuro Watanabe, Kazutsuna Sasaki, Yosuke Tsurumi, Yasuo Kadokura, Karin Sakai
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Patent number: 12174584Abstract: An electrostatic charge image developing toner includes: toner base particles containing a binder resin and a metal pigment; and an external additive containing lanthanum-containing strontium titanate particles.Type: GrantFiled: December 20, 2021Date of Patent: December 24, 2024Assignee: KONICA MINOLTA, INC.Inventor: Keiji Arai
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Patent number: 12164265Abstract: A magnetic carrier including a magnetic core and a coating resin configured to coat the surface of the magnetic core. The coating resin contains a graft resin A and a graft resin B. The coating resin (i) contains 1.0 mass % or more and 50.0 mass % or less of the graft resin A, and (ii) contains 50.0 mass % or more and 99.0 mass % or less of the graft resin B. The graft resin A has a unit Y1 represented by formula (1) and a unit Y2 represented by formula (2). The graft resin B (i) is a comb-shaped polymer having, as a branch, at least one moiety selected from, for example, a styrene-based polymer moiety and a (meth)acrylate-based polymer moiety, and (ii) contains the polysiloxane structure moiety at a content of 0.1 mass % or less.Type: GrantFiled: January 26, 2022Date of Patent: December 10, 2024Assignee: Canon Kabushiki KaishaInventors: Yuto Onozaki, Ryuji Murayama, Nobuhiro Yoshida, Hironori Minagawa
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Patent number: 12158725Abstract: A toner comprises a toner particle comprising a core particle comprising a resin component, a shell coating the surface of the core particle, and a polyvalent metal. The resin component comprises a polyester resin, and the shell comprises an amino resin; in an electron image of a cross section of the toner acquired using a transmission electron microscope, a polyvalent metal content P(M) obtained by energy-dispersive x-ray analysis at the core/shell interface and in the vicinity of this interface is 0.0010 to 2.00 atomic %; and the surface storage elastic modulus of the toner at a load of 30 ?N at 25° C., according to nanoindentation measurement of the toner, is from 6.50 GPa to 12.00 GPa.Type: GrantFiled: November 1, 2021Date of Patent: December 3, 2024Assignee: CANON KABUSHIKI KAISHAInventors: Mai Kato, Hirofumi Kyuushima, Naoya Isono, Kenichi Nakayama, Yoshiaki Shiotari
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Patent number: 12135507Abstract: Provided is an electrophotographic member that includes a surface with excellent abrasion resistance and allows toner to have an increased charge amount, thereby eliciting uniform and high transfer efficiency. This electrophotographic member is provided with a surface layer including at least one of an acrylic resin and methacrylic resin, the surface layer further including a positively chargeable charge control agent, wherein a surface of the surface layer is free from a convex portion having a height of more than 15 ?m resulting from the charge control agent.Type: GrantFiled: September 22, 2021Date of Patent: November 5, 2024Assignee: CANON KABUSHIKI KAISHAInventors: Noriaki Egawa, Tomoaki Nakai
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Patent number: 12130586Abstract: A method for producing a resin fine particle includes dissolving or melting an oily mixture containing at least a polyester resin, a base, and a basic dye while applying a shearing force to the oily mixture, and emulsifying the dissolved or molten oily mixture by adding a surfactant and an aqueous medium while applying a shearing force to the dissolved or molten oily mixture to prepare a dispersion liquid of the resin fine particle. The resin fine particle includes the polyester resin and the basic dye, has a volume average particle diameter of 0.05 ?m or more and 1 ?m or less, and has a ratio of a concentration of the basic dye in a center of gravity portion of the resin fine particle to a concentration of the basic dye in a surface layer portion having a depth of 10 nm or less from a surface of the resin fine particle of 0.8 or more.Type: GrantFiled: July 27, 2022Date of Patent: October 29, 2024Assignee: FUJIFILM BUSINESS INNOVATION CORP.Inventors: Daisuke Tomita, Takahiro Yamashita, Yukiaki Nakamura, Takahisa Tatekawa, Masaru Takahashi
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Patent number: 12130587Abstract: The toner includes a toner particle that comprising a core particle containing a resin component and a shell on a surface of the core particle, wherein the resin component comprises more than 50.0 mass % of a polyester resin comprising a monomer unit that contains a heterocyclic group, and the shell comprises at least one resin selected from the group consisting of prescribed (meth)acrylic resins and melamine resins.Type: GrantFiled: March 18, 2021Date of Patent: October 29, 2024Assignee: CANON KABUSHIKI KAISHAInventors: Naoya Isono, Kenichi Nakayama, Hirofumi Kyuushima, Mai Kato
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Patent number: 12124212Abstract: A toner comprising a toner particle that comprises a core particle comprising a binder resin and a surface layer comprising inorganic fine particles and an organosilicon polymer, wherein the organosilicon polymer has T3 structure represented by R—Si(O1/2)3, in 29Si-NMR measurement of THF insoluble-matter of the toner particle, a proportion of a peak area assigned to the T3 structure relative to a total peak area for the organosilicon polymer is at least 5.0%, and in observation of a cross section of the toner particle using TEM, the toner has a prescribed surface layer thickness, a prescribed number of inorganic fine particles in contact with the core particle in the surface layer, and a prescribed number of inorganic fine particles present in the core particle and not in contact with the surface layer.Type: GrantFiled: May 25, 2021Date of Patent: October 22, 2024Assignee: CANON KABUSHIKI KAISHAInventors: Shintaro Kawaguchi, Masatake Tanaka, Tatsuya Saeki, Masamichi Sato