Patents Examined by Thorl Chea
  • Toner
    Patent number: 10012923
    Abstract: Provided is a toner including toner particles, each of which contains a binder resin, a colorant, a releasing agent and a crystalline polyester, wherein in an observation of a cross-section each of the toner particles by transmission electron microscopy, specific toner particles each of which has domains of the crystalline polyester and domains of the releasing agent, are present at a ratio of at least 70% by number of the toner particles in the toner, an arithmetic mean of maximum diameters of the domains of the releasing agent is within prescribed range, and the specific toner particles satisfy prescribed conditions.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: July 3, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tomohisa Sano, Yusuke Hasegawa, Yoshitaka Suzumura, Satoshi Arimura, Takuma Ikejiri
  • Toner
    Patent number: 10012917
    Abstract: There is provided a toner comprising a binder resin, a wax, a charge control resin and a colorant. As a result of gas chromatography analysis, a first total amount of components detected in a range of a peak detecting time of hydrocarbons having 5 to 9 carbons is 500 ppm or less in terms of styrene; a second total amount of components detected in a range of a peak detecting time of hydrocarbons having 10 to 18 carbons is 5,000 ppm or less in terms of styrene; and an amount of a component corresponding to a maximum peak of peaks of hydrocarbons having 10 to 18 carbons is 3,000 ppm or less in terms of styrene.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: July 3, 2018
    Assignee: ZEON CORPORATION
    Inventors: Takeru Chiba, Hiroshi Nakatani
  • Styrene acrylate hybrid toner process utilizing a low VOC (volatile organic compound) coalescent agent in toner shells
    Patent number: 10007205
    Abstract: Disclosed herein include processes of preparing hybrid toner compositions with toner particles having a core-shell type structure, where the shell contains a non-volatile coalescent agent. More particularly, embodiments relate to processes of preparing styrene acrylate hybrid toner compositions.
    Type: Grant
    Filed: July 8, 2015
    Date of Patent: June 26, 2018
    Assignee: XEROX CORPORATION
    Inventors: Richard P N Veregin, Valerie M. Farrugia, Nan-Xing Hu, Sandra J. Gardner
  • Electrophotographic photosensitive member, process cartridge, and image forming apparatus
    Patent number: 10001714
    Abstract: An electrophotographic photosensitive member includes a conductive base; an organic photosensitive layer disposed on the conductive base, the organic photosensitive layer including a layer that constitutes a surface and contains a charge transport material, a binder resin having a viscosity-average molecular weight less than about 50,000, and silica particles in an amount of about 40% by weight or more; and an inorganic protective layer disposed on the organic photosensitive layer.
    Type: Grant
    Filed: January 15, 2016
    Date of Patent: June 19, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masaki Hirakata, Takeshi Iwanaga, Nobuyuki Torigoe, Hideya Katsuhara, Yoichi Kigoshi, Takashi Imai, Fumiaki Mera
  • Electrostatic latent image developing toner
    Patent number: 10001717
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including 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 a plurality of organic particles each adhering to a surface of the toner core. The shell layer contains a first resin having a glass transition point of at least 50° C. and no greater than 90° C. The organic particles each contain a releasing agent and a second resin having a glass transition point of at least 90° C. and no greater than 110° C.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: June 19, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hiroki Uemura, Kohei Yamauchi
  • Toner and method for manufacturing the same
    Patent number: 9996018
    Abstract: In a toner containing a resin, a pigment, and a pigment dispersant, the resin contains a polar resin having an acid value of 2.0 to 30.0 mgKOH/g, and the pigment dispersant has the structure represented by the following formula (1) and a polymer moiety bonded thereto.
    Type: Grant
    Filed: August 30, 2016
    Date of Patent: June 12, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Haruko Kubo, Yu Yoshida, Yuhei Terui, Hitoshi Itabashi
  • Image formation apparatus, transparent developer and developer cartridge
    Patent number: 9989870
    Abstract: An image formation apparatus includes a first development device configured to form a color developer image with a color developer, and a second development device configured to form a transparent developer image with a transparent developer. The ratio of the viscosity of the transparent developer to the viscosity of the color developer is not greater than a certain amount.
    Type: Grant
    Filed: September 26, 2014
    Date of Patent: June 5, 2018
    Assignee: Oki Data Corporation
    Inventor: Yoshihiro Hashimoto
  • Toner compositions with antiplasticizers comprising purine derivative
    Patent number: 9989873
    Abstract: Disclosed herein include styrene-acrylic-based compositions containing a purine derivative antiplasticizer with particles having a core-shell type structure and methods for their preparation.
    Type: Grant
    Filed: April 27, 2017
    Date of Patent: June 5, 2018
    Assignee: XEROX CORPORATION
    Inventors: Valerie M. Farrugia, Richard Philip Nelson Veregin
  • Electrostatic image developing toner
    Patent number: 9983495
    Abstract: An electrostatic image developing toner including a toner particle, wherein the toner particle contains a vinyl resin which is a polymer of a vinyl monomer having an acid group, a polyester resin, at least one of aluminum (Al) and magnesium (Mg), and tin (Sn), and when net intensities of Al, Mg and Sn in the toner particle measured by fluorescent X-ray analysis are respectively expressed as IAl, IMg and ISn, a ratio (IAl+IMg)/ISn is within a range of 0.5 to 2.5.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: May 29, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Junya Ueda, Kenshi Miyajima, Takaki Kawamura
  • Toner, toner housing unit, and image forming apparatus
    Patent number: 9977367
    Abstract: A toner includes a toner base particle including a binder resin; a release agent; and an inorganic fine particle, and an external additive. The inorganic fine particle is silica having an average abundance ratio at the surface of the toner base particle of from 70% to 90%. The toner base particle has a BET specific surface area of from 1.0 m2/g to 2.5 m2/g after the external additive is removed from the toner.
    Type: Grant
    Filed: November 1, 2016
    Date of Patent: May 22, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Kojima, Satoshi Takahashi, Tatsuru Moritani, Shosuke Aoai, Tatsuki Yamaguchi
  • Cold pressure fix toner compositions based on crystalline polyester and amorphous organic compound mixtures
    Patent number: 9977356
    Abstract: A cold pressure fix toner composition includes at least one crystalline polyester material having a melting point in a range from about 30° C. to about 130° C. and at least one C16 to C80 amorphous organic material having a Tg of from about ?30° C. to about 70° C. A method of cold pressure fix toner application includes providing the cold pressure fix toner composition, disposing the cold pressure fix toner composition on a substrate, and applying pressure to the disposed composition on the substrate under cold pressure fixing conditions. A latex can be formed from the cold pressure fix toner composition.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: May 22, 2018
    Assignee: XEROX CORPORATION
    Inventors: Richard Philip Nelson Veregin, Kentaro Morimitsu, Guerino G. Sacripante, Ke Zhou, Nan-Xing Hu
  • Toner for developing electrostatic latent image
    Patent number: 9964875
    Abstract: Disclosed is a toner for developing an electrostatic latent image, the toner comprising a plurality of toner particles, each toner particle includes: a core particle that contains a binding resin, a coloring agent, and a releasing agent; and an external additive attached to the surface of the core particle, wherein the toner has two endothermic peaks in a heat curve, which is obtained at the time of the secondary temperature rise in differential scanning calorimetry of the toner, and a stepped endothermic curve; and first and second melting temperatures, which are determined to be the locations of vertices of the two endothermic peaks, a glass transition temperature, which is determined to be the midpoint of a linear portion of the stepped endothermic curve, and first and second heat of melting, which are determined to be the areas of the two endothermic peaks, satisfy the condition set forth herein.
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: May 8, 2018
    Assignee: S-PRINTING SOLUTION CO., LTD.
    Inventors: Se-young Yoon, Hae-ree Joo, Sung-jun Cho
  • Electrophotographic photoreceptor and image forming apparatus and image forming method using the same
    Patent number: 9964870
    Abstract: An electrophotographic photoreceptor includes at least a photosensitive layer and a protective layer sequentially layered on a conductive support, wherein the protective layer contains a cured product of a curable composition containing p-type semiconductor fine particles, an n-type organic semiconductor, and a polymerizable compound.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: May 8, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Masanori Yumita, Hirofumi Hayata
  • Coated photoconductors
    Patent number: 9933715
    Abstract: The present disclosure is related to coated photoconductors. In an example, a coated photoconductor can comprise a photoconductor including a substrate having a charge generation layer and charge transport layer adhered thereto and a top coating adhered to the photoconductor.
    Type: Grant
    Filed: June 13, 2016
    Date of Patent: April 3, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Krzysztof Nauka, Zhang-Lin Zhou, Hou T. Ng
  • Electrophotographic toner and method for producing the same
    Patent number: 9933721
    Abstract: Disclosed is a decolorizable electrophotographic toner, including: a binder resin; and a colorant which contains at least a color developable compound and a color developing agent and is covered with an outer shell so as to have a capsule structure, wherein the number ratio of particles having an equivalent circle diameter of 0.6 ?m or more and 2.5 ?m or less of the toner when measured using a flow particle image analyzer after the toner is dispersed in an aqueous medium at a ratio of 0.08% by weight and the resulting dispersion is subjected to a stirring treatment in which stirring is performed at 5000 rpm for 30 minutes using a homogenizer (T-25 digital ULTRA-TURRAX (manufactured by IKA Japan K.K., provided with a shaft generator S25N-10G)) is 30% by number or less.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: April 3, 2018
    Assignees: TOSHIBA TEC KABUSHIKI KAISHA, KABUSHIKI KAISHA PILOT CORPORATION, THE PILOT INK CO., LTD.
    Inventors: Masahiro Ikuta, Takahito Kabai, Takayasu Aoki, Tsuyoshi Itou
  • Toner
    Patent number: 9915885
    Abstract: The present invention provides a toner that excels in low-temperature fixability and also maintains charging performance, storability, and anti-hot offset property even in long-term image output. The toner comprising a toner particle containing an amorphous polyester resin, a crystalline polyester resin, wax, and a colorant, wherein a weight-average molecular weight (Mw) of the crystalline polyester resin is 5000 to 14,000, and the crystalline polyester resin includes 0.5 mass % to 15.0 mass % of a segment derived from one or more aliphatic compounds selected from the group consisting of aliphatic monocarboxylic acids with a carbon number of 8 to 20 and aliphatic monohydric alcohols with a carbon number of 8 to 20.
    Type: Grant
    Filed: May 2, 2016
    Date of Patent: March 13, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Wakiko Katsumata, Kentaro Kamae, Masaharu Miura, Takeshi Ohtsu, Koh Ishigami, Ryuichiro Matsuo, Yosuke Iwasaki, Yuichi Mizo
  • Coated silver colored colorant
    Patent number: 9914836
    Abstract: A coated silver colored colorant includes a silver colored pigment, and a primer polymer at least partially coating the silver colored pigment. The primer polymer has a glass transition temperature that is less than 40° C. A passivating polymer is attached to the primer polymer. The passivating polymer has a glass transition temperature that is greater than 40° C.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: March 13, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Sivapackia Ganapathiappan, Hou T. Ng, Albert Teishev
  • Cold pressure fix toner compositions based on small molecule crystalline and amorphous organic compound mixtures
    Patent number: 9910373
    Abstract: A cold pressure fix toner composition includes at least one C16 to C80 crystalline organic material having a melting point in a range from about 30° C. to about 130° C. and at least one C16 to C80 amorphous organic material having a Tg of from about ?30° C. to about 70° C. A method of cold pressure fix toner application includes providing the cold pressure fix toner composition, disposing the cold pressure fix toner composition on a substrate and applying pressure to the disposed composition on the substrate under cold pressure fixing conditions. The cold pressure fix toner compositions can be formed into latexes.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: March 6, 2018
    Assignee: XEROX CORPORATION
    Inventors: Richard Philip Nelson Veregin, Nan-Xing Hu, Guerino G. Sacripante, Karen A. Moffat, Jennifer L. Belelie
  • Toner
    Patent number: 9897933
    Abstract: Provided is a toner that is excellent in development durability and has excellent solid followability even when the amount of the toner in a toner cartridge is small. The toner includes toner particles each having a surface layer containing an organosilicon polymer, in which: the organosilicon polymer includes a siloxane-based polymer having partial structures represented by the following formulae (1) and (2); and in a chart obtained by 29Si-NMR measurement of a tetrahydrofuran-insoluble matter of the toner particles, an area RT3 of a peak assigned to the partial structure represented by the following formula (1) and an area RfT3 of a peak assigned to the partial structure represented by the following formula (2) satisfy the following formula (3). 0.300>(RfT3/RT3)?0.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: February 20, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Sara Yoshida, Katsuyuki Nonaka, Koji Abe, Toshihiko Katakura, Akane Masumoto, Maho Tanaka
  • Electrostatic charge image developing toner, electrostatic charge image developer, and toner cartridge
    Patent number: 9880480
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin and a release agent and an external additive containing fatty acid metal salt particles and abrasive particles, wherein a ratio (B/A) of an isolation amount B of the abrasive particles isolated from the toner particles after an ultrasonic isolation treatment to an isolation amount A of the fatty acid metal salt particles isolated from the toner particles after the ultrasonic isolation treatment is from 0.3 to 2.0.
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: January 30, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hiroki Omori, Mona Tasaki, Yuka Yamagishi, Yutaka Saito, Fusako Kiyono