Chemically Identified Carrier For Dry Toner Patents (Class 430/111.1)
  • 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
  • Patent number: 10955763
    Abstract: Metal-oxide composite particles are used as a toner additive.
    Type: Grant
    Filed: January 5, 2017
    Date of Patent: March 23, 2021
    Assignee: Cabot Corporation
    Inventors: Dmitry Fomitchev, Eugene N. Step
  • Patent number: 10915035
    Abstract: A carrier for developing an electrostatic latent image includes a core material particle and a resin layer covering a surface of the core material particle. The resin layer includes a resin and at least one kind of a fine particle. At least one kind of the fine particles includes a chargeable fine particle. The chargeable fine particle has a long diameter of 400 to 900 nm. The chargeable fine particle has a shape factor SF-1 of 160 to 250.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: February 9, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Haruki Murata, Hiroyuki Kishida, Toyoaki Tano, Kenichi Mashiko, Masato Taikoji, Mariko Takii, Yoshihiro Murasawa
  • Patent number: 10754271
    Abstract: A magnetic core material for electrophotographic developer, satisfying a value of Expression (1): a+b×10+c+d+e+f, being from 300 to 1,300, when an amount of fluorine ion is denoted by a (ppm), an amount of chlorine ion is denoted by b (ppm), an amount of bromide ion is denoted by c (ppm), an amount of nitrite ion is denoted by d (ppm), an amount of nitrate ion is denoted by e (ppm), and an amount of sulfate ion is denoted by f (ppm), which are measured by combustion ion chromatography, and having a BET specific surface area being from 0.06 to 0.25 m2/g.
    Type: Grant
    Filed: December 25, 2017
    Date of Patent: August 25, 2020
    Assignee: POWDERTECH CO., LTD.
    Inventors: Hiroki Sawamoto, Tetsuya Uemura
  • Patent number: 10739689
    Abstract: An electrostatic charge image developer contains a carrier including a core and, on the core, a silicone resin-containing layer serving as a lower layer, and an acrylic resin-containing layer serving as an upper layer, or a carrier including a silicone resin-containing core and an acrylic resin-containing layer on the silicone resin-containing core; strontium titanate particles having an average primary particle size of 20 nm or more and 100 nm or less; and a toner. The percentage of a silicone resin exposed on a surface of the carrier is 0.5 area % or more and 20 area % or less.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: August 11, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shintaro Anno, Yosuke Tsurumi, Takuro Watanabe, Fusako Kiyono
  • Patent number: 10364344
    Abstract: The present disclosure relates to a thermoplastic resin composition and a molded article manufactured from the same. More particularly, the present disclosure relates to a thermoplastic resin composition including 10 to 59% by weight of an acrylic graft copolymer resin (a) having a graft efficiency of 50 to 95%; 1 to 20% by weight of an acrylic graft copolymer resin (b) having a graft efficiency of 5 to 49%; and 21 to 89% by weight of an aromatic vinyl compound-vinyl cyan compound copolymer resin (c), wherein a weight ratio of (a):(b) is 1:1 to 10:1, and a molded article manufactured from the same. In accordance with the present disclosure, a thermoplastic resin composition that exhibits glossy effect by injection molding and matte effect by extrusion molding while providing superior mechanical strength and thus is applicable to both glossy products and matte products, and a molded article manufactured from the same are provided.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: July 30, 2019
    Assignee: LG CHEM, LTD.
    Inventors: Chun Ho Park, Yong Yeon Hwang, Hyun Taek Oh, Min Jung Kim, Sang Mi Lee, Yeong Min Lee, Eun Soo Kang
  • Patent number: 10254674
    Abstract: A carrier for a developer of an electrostatic latent image, the carrier including: core particles having magnetism; and a coating layer coating a surface of each of the core particles, wherein the coating layer includes two or more kinds of inorganic particles, at least one kind of inorganic particles among the two or more kinds of inorganic particles is inorganic particles A having conductivity and a peak particle diameter of from 300 nm through 1,000 nm, and surface roughness of the carrier calculated by Formula 1 below is from 1.10 m2/g through 1.90 m2/g, C?F??Formula 1 where C is a BET specific surface area (m2/g) of the carrier and F is a BET specific surface area (m2/g) of the core particles.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: April 9, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Seki, Hiroyuki Kishida, Haruki Murata, Shinya Nakagawa, Kei Niwayama, Saori Yamada, Kohsuke Miyazaki
  • Patent number: 10248040
    Abstract: An electrostatic latent image developing carrier includes carrier particles each including a carrier core and first and second coat layers covering a surface of the carrier core. The first and second coat layers give a layered structure in which the first coat layer and the second coat layer are layered in order from the surface of the carrier core. The first coat layer contains a fluororesin. The second coat layer contains a silicone resin and a fluorine silane in an amount of at least 1% by mass relative to a mass of the silicone resin. An area SA of a region of a surface region of the first coat layer that is covered with the second coat layer and an area SB of a region thereof that is not covered with the second coat layer satisfy a relationship represented by “0.05?SB/(SA+SB)?0.50”.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: April 2, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu Asakawa
  • Patent number: 10248039
    Abstract: An object of the present invention is to provide a carrier low in specific gravity and less in both environmental fluctuation and change of the charge amount after aging, an electrophotographic developer using the carrier, and a method of manufacturing the carrier. To achieve the object, the carrier is manufactured by coating a core material composed of a magnetic component and a non-magnetic component with a resin, and the carrier is characterized in that water content is 200 ppm or less and cyclic siloxane content is 100 ppb or less. Further, an electrophotographic developer containing the carrier is provided.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: April 2, 2019
    Assignee: POWDERTECH CO., LTD.
    Inventors: Hiroki Sawamoto, Hajime Akiba, Tetsuya Uemura
  • Patent number: 10073368
    Abstract: A developer according to an embodiment includes a toner having a color erasable by heating and a carrier. The carrier includes a core portion and a coating portion covering at least 50% of the core portion. The coating portion includes a white-colored additive agent which suppresses an increase in electrification due to friction between the toner and the carrier, a mass of the additive agent being between 20% and 60% of a total mass of the coating portion.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: September 11, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Sunao Takenaka, Masahiro Ikuta
  • Patent number: 10031434
    Abstract: A carrier includes a resin layer including Al and Sn and covering the surface of the carrier. A detectable amount of Al is from 1.0% to 12.1% by atom and a ratio (Al/Sn) of the detectable amount of Al to that of Sn is from 2.0 to 50.0 when the carrier is subjected to an X-ray photoelectron spectroscopic (XPS) analysis.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: July 24, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Mariko Takii, Yoshihiro Murasawa, Takahiro Nakamura, Kei Niwayama, Haruki Murata, Masato Taikoji, Koichi Sakata
  • Patent number: 9989874
    Abstract: A carrier for developing electrostatic latent images is provided. The carrier includes a magnetic core particle and a resin layer coating a surface of the magnetic core particle. The resin layer includes a particulate material A having a volume average particle diameter (a) and a particulate material B having a volume average particle diameter (b). The volume average particle diameter (a) of the particulate material A is the largest among volume average particle diameters of all particulate materials included in the resin layer, and an inequation 100?(a)/(b)?5 is satisfied. The particulate material A is barium sulfate.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: June 5, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshihiro Murasawa, Toyoaki Tano, Hiroyuki Kishida, Masato Taikoji, Kenichi Mashiko, Mariko Takii, Haruki Murata
  • Patent number: 9885969
    Abstract: A carrier for two-component developer includes a magnetic particle and a resin coating layer that covers the magnetic particle and contains a resin, wherein a weight average molecular weight of the resin contained in the resin coating layer is from 1,800,000 to 5,000,000.
    Type: Grant
    Filed: August 3, 2016
    Date of Patent: February 6, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takeshi Tanabe, Toshiaki Hasegawa, Masaaki Usami, Yasunobu Kashima, Takeshi Iwanaga
  • Patent number: 9829817
    Abstract: A developer includes a toner including toner particles and a carrier including carrier particles. The carrier particles each include a carrier core and a carrier coating layer covering the carrier core. The carrier coating layer contains a fluorine-containing resin. The toner particles each include a toner mother particle and resin particles located on a surface of the toner mother particle. The resin particles have a number average primary particle diameter of at least 70 nm and no greater than 200 nm. A dispersion obtained by dispersing 0.1 g of the resin particles in 100 mL of distilled water has an electrical conductivity of at least 2.5 ?S/m and no greater than 6.0 ?S/m. A degree of aggregation Y160 of the resin particles represented by expression (1) “Y160=100×M160A/M160B” is at least 15% by mass and no greater than 40% by mass.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: November 28, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Toru Takatsuna
  • Patent number: 9811019
    Abstract: A magnetic carrier is provided which can suppress a decrease in glossiness even in a long term use for POD which requires high glossiness. A magnetic carrier includes a filled core particle in which a silicone resin is filled in pores of a porous magnetic core particle and a vinyl resin coating a surface of the filled core particle. In a pore distribution of the porous magnetic core particle measured by a mercury intrusion method, a cumulative pore volume in a pore diameter range of 0.1 to 3.0 ?m is 35.0 to 95.0 mm3/g, and in a pore distribution of the filled core particle measured by a mercury intrusion method, a cumulative pore volume in a pore diameter range of 0.1 to 3.0 ?m is 3.0 to 15.0 mm3/g. The magnetic carrier includes 1.2 to 3.0 parts by mass of the vinyl resin to 100.0 parts by mass of the filled core particle.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: November 7, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kentaro Kamae, Nozomu Komatsu, Koh Ishigami, Yoshinobu Baba
  • Patent number: 9425483
    Abstract: An electrolyte solution including a non-aqueous organic solvent and a magnesium salt represented by Formula 1: wherein in Formula 1, groups CY1, CY2, A1 to A10, and variable n are defined in the specification.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: August 23, 2016
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Basab Roy, Dong-young Kim, Youn-hee Lim, Seok-soo Lee
  • Patent number: 9304427
    Abstract: A carrier for developing an electrostatic latent image of the present invention includes a core material and a coating layer which coats the core material, wherein the coating layer includes a resin and fine particles, wherein the coating layer has an average layer thickness difference of 0.02 ?m to 3.0 ?m, and wherein the carrier for developing an electrostatic latent image has an arithmetic mean surface roughness Ra1 of 0.5 ?m to 0.9 ?m.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: April 5, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Hitoshi Iwatsuki, Shigenori Yaguchi, Toyoaki Tano, Mariko Takii, Koichi Sakata, Hiroyuki Kishida, Hiroshi Tohmatsu
  • Patent number: 9298119
    Abstract: A carrier is provided. The carrier includes a particulate magnetic core, and a cover layer located on the surface of the particulate magnetic core and including a resin and a filler. When determined from observation of cross-section of the carrier, the shape factor SF2 of the carrier is from 120 to 160, the ratio of the average domain diameter of the particulate magnetic core to the number average particle diameter of the filler is from 1:1 to 1:0.003, and the area ratio of the filler in the cover layer is from 30 to 85%.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: March 29, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Shigenori Yaguchi, Koichi Sakata, Hitoshi Iwatsuki, Toyoaki Tano, Hiroyuki Kishida, Kenichi Mashiko, Hiroshi Tohmatsu
  • Patent number: 9291926
    Abstract: A method for producing a toner for electrostatic image development, including the steps of (1) polycondensing an alcohol component, a carboxylic acid component, and polyethylene terephthalate to provide an amorphous polyester; and (2) subjecting the amorphous polyester obtained in the step (1) and components containing a crystalline polyester in an amount of from 0.3 to 2.5 times the mass of the components derived from the polyethylene terephthalate in the amorphous polyester to a process for producing a toner. The toner for electrostatic image development obtained by the method of the present invention is suitably used in development or the like of latent images formed in, for example, an electrophotographic method, an electrostatic recording method, an electrostatic printing method, or the like.
    Type: Grant
    Filed: April 30, 2014
    Date of Patent: March 22, 2016
    Assignee: Kao Corporation
    Inventors: Norihiro Fukuri, Eiji Shirai
  • Patent number: 9285699
    Abstract: Disclosed is a carrier suitable for use with an electrophotographic developer and an electrophotographic developer containing the carrier. In particular, the carrier is powder coated and comprises a copolymer of cyclohexylmethacrylate and dimethylaminoethylmethacrylate.
    Type: Grant
    Filed: May 1, 2014
    Date of Patent: March 15, 2016
    Assignee: XEROX CORPORATION
    Inventors: Bernard A. Kelly, Thomas C. Dombroski, Brian S. Giannetto, Brian E. Moore, Lloyd D. Spencer, Richard P. N. Veregin, Karen A. Moffat, Thomas E. Enright, Valerie M. Farrugia, Michael S. Hawkins, Wafa F. Bashir
  • Patent number: 9201328
    Abstract: Disclosed are a resin-filled ferrite carrier core material for an electrophotographic developer, including a porous ferrite particle having an average compression strength of 100 mN or more and a coefficient of variation of the compression strength of 50% or less, a ferrite carrier obtained by filling a resin in the voids of the ferrite carrier core material, and an electrophotographic developer using the ferrite carrier.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: December 1, 2015
    Assignee: POWDERTECH CO., LTD.
    Inventors: Hiroki Sawamoto, Takao Sugiura
  • Patent number: 9195158
    Abstract: The instant disclosure describes methacrylate coated carrier resins with aromatic substituent groups with optionally carbon atoms replaced by heteroatoms such as S, N, and O for charge control and improved RH sensitivity.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: November 24, 2015
    Assignees: Xerox Corporation, NRC of Canada
    Inventors: Richard P N Veregin, Qingbin Li, Andriy Kovalenko, Sergey Gusarov, Daryl W Vanbesien, Michael S Hawkins
  • Patent number: 9086647
    Abstract: A developing device, including: a developer bearing member, which is disposed opposite to an electrostatic latent image bearing member and which bears thereon a developer for developing an electrostatic latent image formed on the electrostatic latent image bearing member and conveys the developer to a developing region, wherein the developer includes a toner and a carrier, the toner containing: a toner base containing a binder resin and a colorant; and an external additive, wherein the external additive contains coalescent particles each made up of a plurality of coalescing primary particles, and wherein a work function Wc of the carrier and a work function Ws of the developer bearing member satisfy a relationship of the following formula (1): Ws?Wc?0.4 eV??(1).
    Type: Grant
    Filed: September 10, 2013
    Date of Patent: July 21, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Shingo Sakashita, Junichi Awamura, Tsuneyasu Nagatomo, Satoshi Kojima, Tomoki Murayama
  • Patent number: 9046800
    Abstract: Provided is the following magnetic carrier. The magnetic carrier maintains high developing performance even when the number of sheets to be output is large. Its charge-providing performance hardly reduces even when toner or an external additive is spent on the magnetic carrier. In addition, the magnetic carrier is strong in resistance against standing. The magnetic carrier includes a magnetic carrier core and a resinous coating layer formed on a surface of the magnetic carrier core, in which the resinous coating layer contains a resin composition and silica-alumina composite particles.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: June 2, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yojiro Hotta, Naoki Okamoto, Kazuo Terauchi, Ryuichiro Matsuo, Tetsuya Ida
  • Patent number: 9040217
    Abstract: The present invention provides a carrier for a two-component electrophotographic developer, comprising a core particle and a thermoset silicone resin layer coated thereon, wherein said layer comprises a charge control agent and is formed by heat-treatment at a temperature below the melting point of said charge control agent.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: May 26, 2015
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Kazuki Takatsuka, Tatsuo Imafuku, Takahiro Bito, Takeshi Satoh, Masaki Ueji
  • Patent number: 9029060
    Abstract: A carrier for electrostatic latent image developing is composed of carrier core containing a binder resin and magnetic material particles, and a shell layer that covers the carrier core. The binder has an acid value of at least a predetermined value, and contains a resin having a carboxyl group. The shell layer is composed of a resin selected from melamine resin and urea resin.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: May 12, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masami Tujihiro, Yoshio Ozawa
  • Patent number: 9029061
    Abstract: A carrier for use in a two component developer for developing an electrostatic latent image is provided. The carrier includes a particulate core material; and a cover layer located on a surface of the core material and including a silicone resin and barium sulfate. The cover layer includes Ba and Si at an atomic ratio of from 0.01 to 0.08 as determined by X-ray photoelectron spectroscopy.
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: May 12, 2015
    Assignee: Ricoh Company, Limited
    Inventors: Koichi Sakata, Minoru Masuda, Hisashi Nakajima, Kimitoshi Yamaguchi, Yutaka Takahashi, Hitoshi Iwatsuki, Saori Yamada, Toyoaki Tano
  • Patent number: 8974995
    Abstract: The disclosure describes acrylate carrier resins, optionally, with a C/O of at least about 4, comprising a heterocycle comprising sulfur, exhibiting high charge and improved RH sensitivity, carrier compositions comprising the acrylate-coated carriers and developers comprising a toner and the acrylate-coated carrier.
    Type: Grant
    Filed: April 3, 2013
    Date of Patent: March 10, 2015
    Assignee: Xerox Corporation
    Inventors: Richard P N Veregin, Qingbin Li, Andriy Kovalenko, Sergey Gusarov
  • Publication number: 20150056543
    Abstract: [Problem] To provide a sublimation transfer dyeing method capable of highly efficient dyeing of a product to be dyed by an electrophotographic process using a toner, and a dyed product dyed highly efficiently by the dyeing method. [Solution] A sublimation transfer dyeing method attaches a toner to an intermediate recording medium using an electrophotographic process and sublimation-transfers to a dyed product a dye contained in the toner attached to the intermediate recording medium. A dyed product dyed with high efficiency could be provided by a sublimation transfer dyeing method in which the intermediate recording medium has a density of greater than 1.00 g/cm3.
    Type: Application
    Filed: March 13, 2013
    Publication date: February 26, 2015
    Inventors: Yuji Suzuki, Makoto Teranishi, Hirokazu Kitayama, Yoshihiro Takai, Kousuke Takai
  • Patent number: 8945805
    Abstract: The present invention provides an image of high image quality by using a magnetic carrier coated with a novel coating resin composition. Further, the present invention stably provides a good image which is hardly influenced by environmental fluctuation and long-term use and has a superior stability of a charging amount when left to stand especially under high temperature and high humidity environments. The present invention also provides a magnetic carrier characterized in that a carrier core surface is coated with a copolymer containing at least, as copolymerization components, an acrylic monomer having a specific structure and an acrylic macromonomer having a specific structure.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: February 3, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshinobu Baba, Koh Ishigami, Naoki Okamoto, Tomoko Endo
  • Publication number: 20140370435
    Abstract: The instant disclosure describes methacrylate coated carrier resins with aromatic substituent groups with optionally carbon atoms replaced by heteroatoms such as S, N, and O for charge control and improved RH sensitivity.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Inventors: Richard PN Veregin, Qingbin Li, Andriy Kovalenko, Sergey Gusarov, Daryl W. Vanbesien, Michael S. Hawkins
  • Publication number: 20140370429
    Abstract: The instant disclosure describes methacrylate coated carrier resins with hydrophobic substituents for charge control and improved RH sensitivity.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Inventors: Richard PN Veregin, Qingbin Li, Andriy Kovalenko, Sergey Gusarov, Daryl W. Vanbesien, Michael S. Hawkins
  • Publication number: 20140370432
    Abstract: The instant disclosure describes acrylate-coated carrier resins exhibiting both high charge and improved RH sensitivity, carrier compositions comprising the acrylate coated carriers and developers comprising the carrier resins.
    Type: Application
    Filed: June 14, 2013
    Publication date: December 18, 2014
    Inventors: Richard PN Veregin, Qingbin Li, Andriy Kovalenko, Sergey Gusarov, Daryl W. Vanbesien, Michael S. Hawkins
  • Publication number: 20140370430
    Abstract: A toner particle includes a core containing a styrene-based resin; a low melting point wax; optionally an additive package; and optionally a colorant, wherein the low melting point wax has a melting point of less than about 80° C. A method of making a toner particle includes forming a slimy by mixing together an emulsion containing a resin, a low melting point wax, optionally a colorant, optionally a surfactant, optionally a coagulant, and one or more additional optional additives; and heating the slurry to form aggregated particles in the slurry, wherein the aggregated particles form a core of the toner particles; and the low melting point wax has a melting point of less than about 80° C.
    Type: Application
    Filed: June 13, 2013
    Publication date: December 18, 2014
    Inventors: Grazyna E. KMIECIK-LAWRYNOWICZ, Samir KUMAR, Robert D. BAYLEY, Maura A. SWEENEY
  • Patent number: 8903270
    Abstract: A developing device including a developer bearing member containing a magnetic field generator having multiple magnetic poles and a developer containing chamber is provided. The developer containing chamber contains a two-component developer comprising magnetic carrier particles having a saturated magnetization of 58 to 70 emu/g in a magnetic field of 1KOe and toner particles, and has a divider to define an upper supply chamber and a lower collection chamber. The supply chamber includes a supply conveyer to supply the two-component developer to the developer bearing member at an upstream side from the developing area. The collection chamber includes a collection conveyer to collect the two-component developer from the developer bearing member at a downstream side from the developing area. The multiple magnetic poles includes three developer bearing poles capable of bearing the developer on its surface.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: December 2, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Koichi Sakata, Shigenori Yaguchi, Toyoshi Sawada, Hitoshi Iwatsuki, Hiroyuki Kishida
  • Publication number: 20140302434
    Abstract: The disclosure describes acrylate carrier resins, optionally, with a C/O of at least about 4, comprising a heterocycle comprising sulfur, exhibiting high charge and improved RH sensitivity, carrier compositions comprising the acrylate-coated carriers and developers comprising a toner and the acrylate-coated carrier.
    Type: Application
    Filed: April 3, 2013
    Publication date: October 9, 2014
    Applicants: National Research Council of Canada, Xerox Corporation
    Inventors: Richard PN Veregin, Qingbin Li, Andriy Kovalenko, Sergey Gusarov
  • Publication number: 20140302435
    Abstract: The disclosure generally describes carrier resins, and in particular, resins used for carrier coatings which include at least one ester functional group and at least one cyclic aliphatic group containing at least one nitrogen atom in the cyclic ring structure. Carriers having such resins in the coating exhibit high charge and excellent relative humidity (RH) sensitivity of charge to changing environmental conditions.
    Type: Application
    Filed: April 3, 2013
    Publication date: October 9, 2014
    Applicants: National Research Council of Canada ("NRC"), XEROX CORPORATION
    Inventors: RICHARD P. VEREGIN, Qingbin Li, Andriy Kovalenko, Sergey Gusarov, Darren Makeiff, Valerie Farrugia, Michael S. Hawkins
  • Publication number: 20140287355
    Abstract: Disclosed are a resin-filled ferrite carrier core material for an electrophotographic developer, including a porous ferrite particle having an average compression strength of 100 mN or more and a coefficient of variation of the compression strength of 50% or less, a ferrite carrier obtained by filling a resin in the voids of the ferrite carrier core material, and an electrophotographic developer using the ferrite carrier.
    Type: Application
    Filed: March 19, 2014
    Publication date: September 25, 2014
    Inventors: Hiroki SAWAMOTO, Takao SUGIURA
  • Patent number: 8815486
    Abstract: A carrier for a two-component developer, includes: magnetic particles and a resin coating layer that is coated on the magnetic particles, the resin coating layer containing metal nitride particles having a volume average primary particle diameter of from about 300 to about 2,000 nm.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: August 26, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Norihito Fukushima, Toshiaki Hasegawa, Yosuke Tsurumi
  • Patent number: 8808957
    Abstract: A carrier for developing an electrostatic image, includes: magnetic core material particles and a coated layer coated on the magnetic core material particles, the coated layer containing a resin having a monomer unit represented by formula (A): wherein R1 represents a hydrogen atom or a methyl group; R2 to R4 each independently represent a hydrogen atom, an alkyl group, an aryl group or an aralkyl group; R5 independently represents an alkyl group, an aryl group or an aralkyl group; n represents an integer of from 0 to 7; and L1 represents a single bond or an alkylene group, provided that at least one of R3 and R4 is not a hydrogen atom.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: August 19, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuaki Hashimoto, Yosuke Tsurumi
  • Publication number: 20140199623
    Abstract: The disclosure describes a process to produce toner with tunable gloss levels comprising a stabilizer to freeze particle growth following aggregation, where the stabilizer does not chelate metal ions.
    Type: Application
    Filed: January 15, 2013
    Publication date: July 17, 2014
    Applicant: XEROX CORPORATION
    Inventors: Yulin Wang, Ke Zhou, Tie Hwee Ng, Edward Graham Zwartz, Cuong Vong, Shigang Qiu
  • Publication number: 20140178813
    Abstract: A method for manufacturing a fatty acid metal salt particle includes forming a coating layer including a fatty acid metal salt on a surface of a core material particle in supercritical carbon dioxide.
    Type: Application
    Filed: June 6, 2013
    Publication date: June 26, 2014
    Inventors: Hiroyoshi OKUNO, Junichi TOMONAGA, Takeshi IWANAGA, Shunsuke NOZAKI, Hideaki YOSHIKAWA
  • Publication number: 20140154623
    Abstract: The carrier core particles for electrophotographic developer include a core composition expressed by a general formula Fe3O4 as a main ingredient and 30 ppm to 400 ppm Na. Such carrier core particles can reduce environmental dependency thereof, while optimizing the resistivity.
    Type: Application
    Filed: February 7, 2014
    Publication date: June 5, 2014
    Applicants: DOWA IP CREATION CO., LTD., DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventor: Takeshi KAWAUCHI
  • Patent number: 8741525
    Abstract: The resin coated carrier is used with a toner in which an external additive having an average primary particle size of 50 nm or more is added to a toner particle, and has a carrier core and a resin coating layer on the surface of the carrier core. In the resin coated carrier, the following expression (1) is satisfied: 0.5??log {(A/C)/(B/C)}?2.5??(1) wherein A represents a volume resistance value (?/cm) of the resin coated carrier in an electric field of 1000 V/cm that is obtained by conducting a stirring test, B represents a volume resistance value (?/cm) of the resin coated carrier in an electric field of 1000 V/cm before the stirring test, and C represents a volume resistance value (?/cm) of the carrier core in an electric field of 1000 V/cm.
    Type: Grant
    Filed: July 1, 2009
    Date of Patent: June 3, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Osamu Wada, Takanori Kamoto, Tadashi Iwamatsu, Nobuyuki Yoshioka, Hiroyuki Hirakawa, Yoshinori Mutoh, Takashi Hara, Hirofumi Kanda, Yoshio Ichii
  • Patent number: 8728697
    Abstract: A carrier for electrostatic image development includes: a carrier body including a core and a resin coating layer on the core; and first spherical silica particles having a volume-average particle diameter of from 50 nm to 300 nm that adhere to the surface of the carrier body at a ratio of from 0.001 parts by weight to 0.100 parts by weight relative to 100 parts by weight of the carrier body.
    Type: Grant
    Filed: August 12, 2010
    Date of Patent: May 20, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Daisuke Ishizuka
  • Publication number: 20140134527
    Abstract: An external additive for toner that contains a resin particle and two or more kinds of particulates having different compositions present on the resin particle.
    Type: Application
    Filed: October 22, 2013
    Publication date: May 15, 2014
    Inventor: Masayuki ISHII
  • Patent number: 8685603
    Abstract: An electrostatic charge image developer includes a toner containing an external additive and a carrier comprising a resin-coated layer formed on a surface of a core material. The average shape factor SF1 of the toner is from 125 to 135, the number of particles having shape factor SF1 of less than 125 is from 5% to 30% by number with respect to the total number of toner particles, the number of particles having shape factor SF1 of greater than 135 is from 5% to 30% by number with respect to the total number of toner particles, the scratch line width in a scratch strength test of the resin used in the resin-coated layer is from 80 ?m to 200 ?m, and the scratch depth is from 60 ?m to 150 ?m.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: April 1, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Fusako Kiyono, Taichi Yamada, Yosuke Tsurumi, Akira Matsumoto, Akihiro Iizuka
  • Patent number: 8679719
    Abstract: An object of the present invention is to provide a carrier containing core material particles having magnetism and a coating layer on the surfaces of the core material particles, wherein the core material particles have a magnetization at a magnetic field of 1,000 Oersted of 40 emu/g to 100 emu/g, and the carrier has a weight average particle diameter of 20 ?m to 45 ?m, a resistance (Log R) of 11 ?·cm to 17 ?·cm and a relaxation time ? of 150 seconds to 800 seconds.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: March 25, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Kimitoshi Yamaguchi, Naoki Imahashi, Kousuke Suzuki
  • Publication number: 20140072910
    Abstract: A carrier for developing an electrostatic latent image of the present invention includes a core material and a coating layer which coats the core material, wherein the coating layer includes a resin and fine particles, wherein the coating layer has an average layer thickness difference of 0.02 ?m to 3.0 ?m, and wherein the carrier for developing an electrostatic latent image has an arithmetic mean surface roughness Ra1 of 0.5 ?m to 0.9 ?m.
    Type: Application
    Filed: June 26, 2013
    Publication date: March 13, 2014
    Inventors: Hitoshi IWATSUKI, Shigenori Yaguchi, Toyoaki Tano, Mariko Takii, Koichi Sakata, Hiroyuki Kishida, Hiroshi Tohmatsu
  • Patent number: 8652736
    Abstract: The present invention provides a carrier core material for use in the production of an electrophotographic developer which, even when applied, for example, to MFPs (multifunction printers), can realize stable, high-quality and high-speed development, and has a prolonged replacing life of magnetic carriers, and a method of manufacturing the same, a magnetic carrier including the carrier core material, and an electrophotographic developer manufactured from the magnetic carrier. An electrophotographic development carrier is prepared by adding resin particles, a binder, a dispersant, a wetting agent, and water to a raw material powder, wet pulverizing the mixture, drying the pulverized product to give granulated powder, calcinatng the granulated powder, and then sintering the granulated powder to prepare a carrier core material having an internally hollow structure, and coating the carrier core material with a resin.
    Type: Grant
    Filed: September 25, 2006
    Date of Patent: February 18, 2014
    Assignees: Dowa IP Creation Co., Ltd., Dowa Electronics Materials Co., Ltd.
    Inventors: Ryusuke Nakao, Takeshi Kawauchi