Patents Examined by Mark A. Chapman
  • Patent number: 10539896
    Abstract: A toner composition including an amorphous polyester resin; a crystalline polyester resin; a styrene acrylate copolymer; an optional wax; and an optional colorant; wherein the amorphous polyester resin comprises a rosin monomer content of from about 10 to about 25 percent rosin monomer based upon the total amount of monomer comprising the amorphous polyester resin. A toner composition including a core and at least one shell disposed thereover. A toner process including contacting an amorphous polyester resin; a crystalline polyester resin; a styrene acrylate copolymer; an optional wax; an optional colorant; and an optional aggregating agent; wherein the amorphous polyester resin comprises a rosin monomer content of from about 10 to about 25 percent rosin monomer heating to form aggregated toner particles; optionally, adding a shell resin to the aggregated toner particles, heating to coalesce the particles; and recovering the toner particles.
    Type: Grant
    Filed: January 14, 2019
    Date of Patent: January 21, 2020
    Assignee: Xerox Corporation
    Inventors: Kimberly D. Nosella, Guerino G. Sacripante, Edward G. Zwartz, Michael Steven Hawkins
  • Patent number: 10539893
    Abstract: A toner comprising a toner particle comprising a binder resin, wherein a layer comprising an organosilicon condensate is present on the surface of the toner particle; the layer comprising the organosilicon condensate further comprises a reaction product of a compound comprising at least one metal element selected from all the metal elements belonging to Groups 3 to 13, and a polyhydric acid; in a backscattered electron image of the toner captured at a magnification of 50,000 times by using a scanning electron microscope, an average value of an area of the reaction product is from 10 nm2 to 5000 nm2, and a coefficient of variation of the area of the reaction product is not more than 10.0.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: January 21, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Maho Tanaka, Kunihiko Nakamura, Kenta Kamikura, Yusuke Kosaki
  • Patent number: 10527960
    Abstract: A photoreceptor comprises a conductive substrate. An undercoat layer is disposed on the conductive substrate. The undercoat layer includes modified metal oxide particles and a binder resin, the modified metal oxide particles comprising metal oxide particles having an outer surface and hygroscopic polymers attached to the surface. The hygroscopic polymers are made by linking a hydrophilic polymer group to the metal oxide particles using a dithiofunctionalized phosphonatomethylaryl ligand that acts as the linking group. A photosensitive layer is disposed on the undercoat layer.
    Type: Grant
    Filed: October 23, 2018
    Date of Patent: January 7, 2020
    Assignee: XEROX CORPORATION
    Inventor: Jin Wu
  • Patent number: 10520844
    Abstract: A toner includes toner particles. The toner particles each include a toner core and a shell layer covering a surface of the toner core. The toner core contains composite particles. The composite particles are particles of a composite of a releasing agent, an electrically conductive polymer, and a dopant. A ratio of an amount of the composite particles to a mass of the toner cores is at least 0.5% by mass and no greater than 15.0% by mass.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: December 31, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Takatoshi Nozaki
  • Patent number: 10514621
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; a photosensitive layer provided on the conductive substrate; and an undercoating layer that is provided between the conductive substrate and the photosensitive layer and includes a charge transport material containing at least one of imide compounds represented by Formula (1) or (2): (in Formulas (1) and (2), R10, R11, R20, or R21 independently represents a group represented by Formula (3) or (4) where X represents a monovalent organic group having at least one of an alkyl group, an alkylene group, an ether group, an ester group, and a keto group, a halogen atom, a nitro group, an aralkyl group, or an aryl group, Y represents a sulfur atom or an oxygen atom, n represents an integer of 0 to 2, and when n represents 2, two X's may be the same or different), and an imide compound is represented by Formula (1A) where Ar represents an aromatic group having 6 to 18 carbon atoms except for a tetravalent perylene group, X1 and X2 each indepen
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: December 24, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masahiro Iwasaki, Ryosuke Fujii, Kenji Kajiwara, Wataru Yamada
  • Patent number: 10503091
    Abstract: A carrier for electrostatic image development includes: resin-coated magnetic particles each including a magnetic particle and a resin layer that covers the magnetic particle; and strontium titanate particles composed of primary particles having an average circularity of 0.82 to 0.94 and an 84% cumulative circularity of more than 0.92.
    Type: Grant
    Filed: September 4, 2018
    Date of Patent: December 10, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yosuke Tsurumi, Moegi Iguchi, Shintaro Anno, Toshiaki Hasegawa
  • Patent number: 10503088
    Abstract: The present invention relates to an electrophotographic photoreceptor which is a positive charging type electrophotographic photoreceptor comprising a conductive support and a photosensitive layer on the conductive support, wherein the photosensitive layer contains at least a charge generating material, a hole transport material, an electron transport material, and a binder resin in the same layer, and a residual potential VL1 at a point at which an exposure amount for forming a latent image is 0.3 ?J/cm2 is equal to or lower than 130 V when an initial surface potential V0 is set to +700 V, exposure with monochromatic light of 780 nm is performed and measurement is performed by a dynamic method.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: December 10, 2019
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Hiroe Fuchigami, Mitsuo Wada
  • Patent number: 10495996
    Abstract: A toner composition includes toner particles having a resin and a colorant, the composition further including an infrared luminescent taggant disposed on the surface of the toner particles. A method of making a toner composition includes toner particles having a resin and a colorant, the composition further including an infrared luminescent taggant disposed on the surface of the toner particles, the method includes blending toner particles with a surface additive package that includes the infrared luminescent taggant. An article includes a printed image disposed on the article, the printed image made with a toner composition including toner particles having a resin and a colorant, the composition further including an infrared luminescent taggant disposed on the surface of the toner particles, the printed image allowing authentication of the article by infrared detection of the infrared luminescent taggant.
    Type: Grant
    Filed: October 2, 2018
    Date of Patent: December 3, 2019
    Assignee: XEROX CORPORATION
    Inventors: Yu Qi, Jaclyn Janis, Eugene F. Young, Shigeng Li, Chieh-Min Cheng
  • Patent number: 10493531
    Abstract: A method includes placing an additively manufactured article having one or more internal channels in a non-reactive liquid to remove remainder powder from within the one or more internal channels, wherein the non-reactive liquid is a gas at room temperature and/or pressure. Placing the additively manufactured article in the non-reactive liquid includes can include placing the additively manufactured article in liquid nitrogen.
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: December 3, 2019
    Assignee: Delavan Inc.
    Inventors: Diana Giulietti, Eric W. Karlen, Kiley James Versluys
  • Patent number: 10488774
    Abstract: An image forming apparatus including a developing device and a fixing device is provided. The fixing device includes a fixing rotator having a fixing surface, an opposing rotator opposing the fixing rotator to form a nip portion therebetween, and a fixing surface reformer having an abutting layer to abut the fixing surface. The abutting layer contains abrasive grains having an average grain size of 2.0-6.5 ?m on a surface which abuts the fixing surface. The toner comprises a crystalline polyester resin and exhibits G? (storage elastic modulus) of 1.0×107 Pa or lower at 70° C. in a temperature rising in a viscoelasticity measurement, G? of 1.0×107 Pa or higher at 70° C. in a temperature falling in the viscoelasticity measurement, and an endothermic peak indicating an amount of heat absorption of from 2.0 to 8.0 J/g, derived from the crystalline polyester resin, in a first temperature rising in DSC.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: November 26, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Daisuke Inoue, Takahiro Honda, Masami Okamoto, Kenta Kashiwagi, Kaori Hemmi, Yoshihisa Hara
  • Patent number: 10481513
    Abstract: The toner for electrostatic charge development includes a toner particle including: a toner base particle containing a binder resin and a release agent; and an external additive containing titanium dioxide. The number fraction of the toner particle containing the titanium dioxide is 0.1% or more and 2.0% or less.
    Type: Grant
    Filed: January 7, 2019
    Date of Patent: November 19, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kenshi Miyajima, Kouji Sugama
  • Patent number: 10474046
    Abstract: The present disclosure relates generally to a method to make a chemically prepared toner that employs a crash cooling process. In particular, the crash cooling process involves the addition of a toner slurry having a temperature between 70° C. and 90° C. to an equivalent amount of cold water having a temperature between 5° C. and 20° C. Polyester and styrene acrylic toners as well as polyester core shell toners having a borax coupling agent between the toner core and toner shell made from this cooling process results in an improvement to the amount of toner waste, thereby achieving a higher toner usage efficiency for an electrophotographic printing system.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: November 12, 2019
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Kasturi Rangan Srinivasan, Rahel Bekru Bogale, Trent Duane Peter, Brian David Munson
  • Patent number: 10474051
    Abstract: Provided is a carrier for a developer of an electrostatic latent image, the carrier including a core particle, and a resin layer covering the core particle, where the resin layer includes metal compound particles, wherein the metal compound particles include magnesium compound particles or barium compound particles, and an exposed amount B (atomic %) of the magnesium or the barium on a surface of the carrier particle satisfies a relationship below: 10.0?B ?1.2.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: November 12, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Mariko Takii, Koichi Sakata, Tohru Suganuma, Masahiro Seki, Masashi Nagayama, Shinya Nakagawa, Kei Niwayama
  • Patent number: 10466603
    Abstract: An electrophotographic photosensitive member includes a support member, an electroconductive layer, and a photosensitive layer, in this order. The electroconductive layer contains a binder resin, electrically conductive first metal oxide particles, and second metal oxide particles. The refractive index Rb of the binder resin, the refractive index Rc of the first metal oxide particles, and the refractive index Rh of the second metal oxide particles satisfy the relationships: |Rb?Rc|?0.35 and |Rb?Rh|?0.65. The electroconductive layer has a volume resistivity of 1.0×106 ?·cm to 1.0×1013 ?·cm, and the ratio of the specific gravity of the first metal oxide particles to the specific gravity of the second metal oxide particles is 0.85 to 1.20.
    Type: Grant
    Filed: November 27, 2018
    Date of Patent: November 5, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takashi Anezaki, Taichi Sato, Atsushi Fujii
  • Patent number: 10459359
    Abstract: An object of the present invention is to provide a toner binder and a toner that maintains offset resistance while having high gloss and that is excellent in low-temperature fixability, grindability, image strength, and heat-resistant storage stability. The toner binder of the present invention is a toner binder containing a non-linear polyester modified resin (A), wherein the non-linear polyester modified resin (A) is a modified resin having one or more carbon-carbon bonds crosslinking polyesters, and the toner binder has a loss tangent tan ? of 2 to 20 in the entire temperature range of 110° C. to 130° C.
    Type: Grant
    Filed: November 25, 2016
    Date of Patent: October 29, 2019
    Assignee: SANYO CHEMICAL INDUSTRIES, LTD.
    Inventors: Tsuyoshi Izumi, Masaru Honda
  • Patent number: 10459357
    Abstract: An electrophotographic photoreceptor includes a conductive substrate; an undercoat layer formed on the conductive substrate and containing a polyurethane resin, metal oxide particles, a silane coupling agent, and a compound represented by General Formula (ID); and a photosensitive layer formed on the undercoat layer (where R1 to R8 each independently represent a hydrogen atom, a nitro group, a cyano group, a halogen atom, a hydroxyl group, a saturated or unsaturated aliphatic hydrocarbon group optionally having a substituent, an aromatic hydrocarbon group optionally having a substituent, an alkoxy group optionally having a substituent, an aryloxy group optionally having a substituent, a sulfo group optionally having a substituent, an amino group, an alkylamino group optionally having a substituent, or an arylamino group optionally having a substituent).
    Type: Grant
    Filed: June 14, 2018
    Date of Patent: October 29, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takahiro Nakamura, Satoshi Tomita, Shingo Suda, Kazunori Onishi, Hiroshi Hagiwara
  • Patent number: 10451989
    Abstract: Provided is a toner including toner base particles and an external additive, wherein each of the toner base particles includes a binder resin, a release agent, and silica, an average abundance ratio (Xsurf) of the silica on a region adjacent to a surface of the toner base particle is from 70% through 90%, and a projected area average value S(180) per particle of the toner when the toner is heated to 180° C. and a projected area average value S(30) per particle of the toner when the toner is 30° C. satisfy Formula (1) below, 1.4?S(180)/S(30)?1.7??Formula (1).
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: October 22, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Kojima, Satoshi Takahashi, Tatsuru Moritani, Shosuke Aoai, Tatsuki Yamaguchi
  • Patent number: 10451987
    Abstract: A toner includes a europium complex represented by the following Chemical formula where A represents 2-naphthyl group, 2-naphthyl group having a substitution group selected from the group consisting of an alkyl group, an alkoxy group, and a halogen, R represents a fluoroalkyl group having one to three carbon atoms or a methyl group, and R1, R2, R3, and R4 each, independently represent hydrogen atoms, alkyl groups, or aryl groups, wherein the toner has a hydroxyl value of from 20 to 40 mgKOH/g.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: October 22, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyoshi Sawada, Kazumi Suzuki, Yu Naito
  • Patent number: 10444649
    Abstract: A toner includes toner particles. The toner particles each include a composite core and a shell layer covering a surface of the composite core. The composite core is a composite of a toner core and organic particles located on a surface of the toner core. The toner core contains a releasing agent having a carboxyl group. The organic particles contain a resin having a carboxyl group and a mass average molecular weight of from 30,000 to 50,500. The shell layer includes a unit having a non-ring-opened oxazoline group. An amount of the non-ring-opened oxazoline group contained in 1 g of the toner as measured by gas chromatography-mass spectrometry is from 500 ?mol to 1,400 ?mol. An endothermic quantity due to melting of the releasing agent contained in 1 mg of the toner as measured by differential scanning calorimetry is from 80 mJ to 160 mJ.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: October 15, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hiroki Uemura
  • Patent number: 10437166
    Abstract: Provided is a two-component developer for developing an electrostatic latent image incorporating: toner particles each containing a toner mother particle having an external additive on a surface of the toner mother particle; and carrier particles each having a core material particle and a covering layer containing a resin on a surface of the core material particle, wherein the external additive contains inorganic particles; the inorganic particles are subjected to surface modification with silicone oil; a carbon content remained on a surface of the inorganic particle after the surface modification is within 3.0 to 10.0 mass %; a free carbon ratio on the surface of the inorganic particle is 70.0% or more; the carrier particles have a resistance in the range of 1.0×109 to 5.0×1010 ?·cm; and the resin in the covering layer contains a resin formed from a monomer containing an alicyclic methacrylic acid ester monomer.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: October 8, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Koji Shibata, Shinya Obara, Satoshi Uchino