Identified Dry Toner Physical Structure Patents (Class 430/110.1)
  • 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
  • Patent number: 10635011
    Abstract: A toner comprising a toner particle having a binder resin, a wax and a colorant, and metal titanate fine particles having a perovskite crystal structure, wherein in cross section observation of the toner using a transmission electron microscope, when a proportion of an area occupied by the wax in a surface layer region from the surface of the toner particle to a depth of 1.0 ?m is denoted by As, the As is from 5.0% to 30.0%, and a number average particle diameter of primary particles of the metal titanate fine particles is from 10 nm to 80 nm.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: April 28, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Noriyoshi Umeda, Tsuneyoshi Tominaga, Hidekazu Fumita, Taiji Katsura, Shinsuke Mochizuki
  • Patent number: 10520841
    Abstract: An electrostatic image developing toner includes a toner particle and an external additive. The toner particle contains a binder resin and a release agent that includes a hydrocarbon wax. The binder resin includes a vinyl resin and a hybrid resin in which an amorphous resin unit other than polyester resins and a crystalline polyester resin unit are chemically bound together. The toner particle has hybrid resin domains and release agent domains. An average distance Lhyb from the surface of the toner particle to the centers of the hybrid resin domains and an average distance Lwax from the surface of the toner particle to the centers of the release agent domains satisfy Lwax<Lhyb.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: December 31, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Narumasa Sato, Erina Saito, Yuka Kawamoto, Noriyuki Mizutani, Kotaro Yoshihara, Daisuke Ishizuka
  • Patent number: 10503090
    Abstract: Provided is a toner containing a colorant and a binder resin, wherein, in a wettability test of the toner with respect to a methanol/water mixed solvent, the methanol concentration when the transmittance of light at a wavelength of 780 nm is 50% is at least 5.0 volume % and not more than 30.0 volume %, and the interparticle force measured by rupturing a consolidation of the toner formed by compression of the toner with a load of 78.5 N is at least 1.0 nN and not more than 25.0 nN.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: December 10, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tsuneyoshi Tominaga, Akane Masumoto, Toshihiko Katakura, Shiro Kuroki, Kenta Kamikura, Sara Yoshida, Shinsuke Mochizuki, Tsutomu Shimano, Kentaro Yamawaki, Tomonori Matsunaga, Kunihiko Nakamura
  • Patent number: 10488777
    Abstract: A toner contains toner particles, titanate fine particles having a Group II element, and hydrotalcite compound fine particles as an external additive and satisfying 10?Lt?80 and 100?Lh?Weight average particle diameter (D4) of toner particles×0.50, when the number average particle diameter (D1) of primary particles of the titanate fine particles is defined as Lt (nm) and the number average particle diameter (D1) of primary particles of the hydrotalcite compound fine particles is defined as Lh (nm).
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: November 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuo Terauchi, Yojiro Hotta, Koji Nishikawa, Masami Fujimoto, Takaaki Furui, Ryo Nagata, Keisuke Tanaka
  • Patent number: 10268129
    Abstract: A pressure fixation toner for developing an electrostatic charge image includes a styrene resin, a (meth)acrylic acid ester resin, and an oxidative polymerizable compound. The pressure fixation toner has a sea-island structure configured by a sea portion including the styrene resin and island portions including the (meth)acrylic acid ester resin. The (meth)acrylic acid ester resin has a glass transition temperature being lower than a glass transition temperature of the styrene resin by 30° C. or greater.
    Type: Grant
    Filed: November 2, 2017
    Date of Patent: April 23, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Shiori Chonan, Sumiaki Yamasaki, Satoshi Hiraoka, Yasuo Matsumura
  • Patent number: 10175596
    Abstract: An electrostatic latent image developing toner includes plural toner particles containing a crystalline resin, a non-crystalline resin, and a plurality of releasing agent domains. The number of releasing agent domains having a dispersion diameter of at least 50 nm and no greater than 700 nm is at least 15 and no greater than 50 per one toner particle in cross-sections of the toner particles. A total area of the releasing agent domains having a dispersion diameter of at least 50 nm and no greater than 700 nm in the cross-sections of the toner particles is at least 5% and no greater than 20% relative to an area of the cross sections of the toner particles.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: January 8, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Kazuki Tsuchihashi
  • Patent number: 10156800
    Abstract: Provided is a toner comprising a toner particle including a binder resin, an amorphous polyester, and a colorant, wherein the binder resin includes a vinyl resin, the toner has a softening point of at least 110° C. and not more than 140° C., an amount of the amorphous polyester is at least 4.0 parts by mass and not more than 30.0 parts by mass with respect to 100 parts by mass of the binder resin, and a temperature T at which an area increasing rate of one toner particle sample becomes 1.40, is not more than 110° C., and a slope of the area increasing rate with respect to a temperature in the range of the area increasing rate of 1.40 to 2.00 is not more than 0.07.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: December 18, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Tsuda, Naoki Okamoto, Takashi Matsui, Yuujirou Nagashima, Keisuke Tanaka
  • Patent number: 10009515
    Abstract: A calibration system includes an imaging device, an image forming apparatus, and a table generating unit. The table generating unit: calculates a first weighting coefficient based on dispersion of color values of pixels inside the patch in a captured image for each of the patches where the captured image is generated by simultaneously capturing the test chart of the sheet generated by the image forming apparatus and a preliminary prepared reference chart with the imaging device; calculates a representative value for each tone of the color value of each of the patches in the test chart and the reference chart based on an average of a weighted average of the color value of the plurality of patches; and generates the gamma correction table based on the respective representative values in the test chart and the reference chart.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: June 26, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Yoshitaka Kishi
  • Patent number: 9964881
    Abstract: A toner comprising toner particles, each of which contains a binder resin and a colorant, wherein an onset temperature Te (° C.) of a storage elastic modulus E? obtained in a powder dynamic viscoelastic measurement on the toner is at least 50° C. and not more than 70° C., and a value at Te (° C.) of a storage elastic modulus G? obtained in a pellet dynamic viscoelastic measurement on the toner is at least 4.0×107 Pa and not more than 1.0×1010 Pa.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: May 8, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takuma Ikejiri, Yusuke Hasegawa, Tomohisa Sano, Yoshitaka Suzumura, Shohei Yamashita
  • Patent number: 9785077
    Abstract: The present invention provides a toner having a toner particle that contains a binder resin and an organic silicon polymer, wherein the organic silicon polymer has a specific structure, the proportion of the specific structure to the number of a silicon atom in the organic silicon polymer contained in the toner particle is at least 5.0%, the toner particle contain a polyester resin of from at least 1.0% by mass to less than 80% by mass, and the polyester resin is a specific polymer.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: October 10, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koji Abe, Yuhei Terui, Katsuyuki Nonaka, Tsuneyoshi Tominaga
  • Patent number: 9785065
    Abstract: A toner including: binder resin; and release agent, wherein the release agent is 1% to 8% by mass to the toner, as equivalent mass of endothermic amount of the release agent determined by DSC, wherein the release agent present in region from surface of the toner to 0.3 ?m depth is 0.1% to 4% by mass, as determined by FTIR-ATR, and wherein, in TEM image of torn surface of the toner, WDa<WDb<WDc is satisfied, WDa denoting number-average-particle-diameter of the release agent in region Aa that is from surface of the toner to depth that is one-sixth of diameter d of the toner (?d), WDc denoting number-average-particle-diameter of the release agent in central region Ac that is circular region having center located at center of the toner and radius of ?d, WDb denoting number-average-particle-diameter of the release agent in region Ab that is other than region Aa or Ac.
    Type: Grant
    Filed: March 24, 2015
    Date of Patent: October 10, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Ryota Inoue, Yoshihiro Moriya, Masahiko Ishikawa, Satoshi Takahashi, Tatsuki Yamaguchi, Satoshi Kojima
  • Patent number: 9684257
    Abstract: Disclosed herein include styrene-acrylic-based binder compositions containing an antiplasticizer with particles having a core-shell type structure and methods for their preparation.
    Type: Grant
    Filed: June 20, 2016
    Date of Patent: June 20, 2017
    Assignee: XEROX CORPORATION
    Inventors: Valerie M. Farrugia, Richard P. N. Veregin, Michael S. Hawkins
  • Patent number: 9645518
    Abstract: A toner contains toner particles having a surface layer containing an organosilicon polymer. The organosilicon polymer has a particular partial structure. The surface layer has a particular average thickness Dav. The ratio of silicon ions to carbon ions emitted from the toner particles in response to irradiation of the toner particles with primary ions in mapping measurement by FIB-TOF-SIMS is specified.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: May 9, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji Abe, Yuhei Terui, Taiji Katsura, Naoya Isono, Katsuyuki Nonaka
  • Patent number: 9632441
    Abstract: The present invention is a toner that has toner particles that have a surface layer that contains an organosilicon polymer, wherein this organosilicon polymer has a specific substructure and the ratio [ST3], in a 29Si-NMR measurement of a tetrahydrofuran-insoluble matter of the toner particles, of the peak area for this substructure to the total peak area for the organosilicon polymer satisfies the relationship ST3?0.40.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: April 25, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koji Abe, Yuhei Terui, Taiji Katsura, Katsuyuki Nonaka
  • Patent number: 9442403
    Abstract: Provided is a toner, including: a crystalline resin; and a colorant, wherein the toner has a sea island structure in which a crystal region containing the crystalline resin is formed as a sea, and a non-crystalline region containing the colorant is formed as an island.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: September 13, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Azumi Miyaake, Kazumi Suzuki, Masana Shiba, Tatsuya Morita, Yoshitaka Yamauchi
  • Patent number: 9377703
    Abstract: According to one implementation, a toner includes a toner mother particle and a convex portion on a surface of the toner mother particle. The toner mother particle includes at least a resin (1). The convex portion is formed from a resin particle including at least a resin (2). An average value of a length of a long side of the convex portion is within a range of 0.1 to 0.5 ?m. A ratio between a Young's modulus of a non-convex portion of the toner mother particle (ER (1)) and a Young's modulus of a convex portion of the toner mother particle (ER (2)) is a value (ER (1)/ER (2)) within the range of 1.2 to 2.0.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: June 28, 2016
    Assignee: KONICA MINOLTA, INC.
    Inventors: Junichi Furukawa, Shiro Hirano, Kenshi Miyajima, Naoya Tonegawa, Asao Matsushima, Tatsuya Nagase
  • Patent number: 9063444
    Abstract: According to one embodiment, a method of manufacturing a color erasable developing agent including preparing a dispersion containing a fine particle containing a leuco dye and a developer, a fine particle containing a color erasing agent, a toner binder resin fine particle and a medium, aggregating the fine particles in the medium, and heat fusing the aggregate to form a toner particle is provided.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: June 23, 2015
    Assignee: Toshiba Tec Kabushiki Kaisha
    Inventors: Takahito Kabai, Tsuyoshi Itoh, Takayasu Aoki
  • Patent number: 9034548
    Abstract: A toner containing colorant, releasing agent, and binder resin containing crystalline polyester resin, and non-crystalline polyester resin containing urethane bond, urea bond, or both, the non-crystalline polyester resin containing first and second non-crystalline polyester resins, both containing urethane bond, or urea bond, or both, wherein monomers constituting the first non-crystalline polyester resin contains isocyanate monomer for forming the urethane bond, the urea bond, or the both, in an amount of 0.5 mol % or greater to total amount of the monomers, monomers constituting the second non-crystalline polyester resin contain isocyanate monomer for forming the urethane bond, the urea bond, or the both, in an amount of 0.5 mol % or greater to total amount of the monomers, the first non-crystalline polyester resin has Tg of ?60° C. or higher but lower than 10° C., and the second non-crystalline polyester resin has Tg of 30° C. or higher but lower than 70° C.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: May 19, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Tatsuru Moritani, Hiroshi Yamashita, Tsuyoshi Sugimoto, Daisuke Asahina, Rintaro Takahashi, Susumu Chiba
  • Patent number: 9023570
    Abstract: A toner contains a binder resin, a colorant, and a releasing agent, wherein the toner contains toner particles, and wherein a proportion of the toner particles containing one or more voids having diameters D1 of larger than 0.0 ?m but 0.5 ?m or smaller is more than 5.0% to 60%, and a proportion of the toner particles containing one or more voids having diameters D2 of 1.0 ?m or larger is 10% or less.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: May 5, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Masana Shiba, Ryuta Chiba, Tsuneyasu Nagatomo
  • Patent number: 9017914
    Abstract: A toner for developing an electrostatic latent image includes toner particles. An average aspect ratio of the toner particles, having predetermined diameters of at least 3 ?m and less than 10 ?m, is in the range from about 0.820 to about 0.900, and the difference between the maximum value and minimum value among the average aspect ratios D3, D4, D5, D6, D7, D8, and D9 is up to 0.07. Dn represents an average aspect ratio of those toner particles having a diameter of at least n ?m and less than n+1 ?m.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: April 28, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Takanori Tanaka
  • Publication number: 20150111144
    Abstract: Composite materials such as composite particles have a solid non-elastomeric continuous phase made of an organic polymer having a glass transition temperature of at least 25° C. Dispersed within this solid non-elastomeric continuous phase are many multi-compartment porous chemically crosslinked elastomeric particles that have a mode particle size of at least 1 ?m and up to and including 10 ?m. The composite particles can be used as toner particles in electrophotographic imaging methods to provide fused toner images and especially stacked fused toner images.
    Type: Application
    Filed: October 18, 2013
    Publication date: April 23, 2015
    Inventors: Mridula Nair, Joseph Salvatore Sedita, Peter David Rollinson
  • Patent number: 9012118
    Abstract: Toners are provided which possess excellent blocking characteristics. The toners include cores including amorphous resins having low glass transition temperatures, amorphous resins having high glass transition temperatures, and crystalline resins, and shells including amorphous resins having high glass transition temperatures.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: April 21, 2015
    Assignee: Xerox Corporation
    Inventors: Allan K. Chen, Tie Hwee Ng, Edward Graham Zwartz, Michael S. Hawkins
  • Patent number: 9005867
    Abstract: A process includes forming a filter cake from a slurry of emulsion aggregation toner particles and washing the filter cake with an alcohol to create porous toner particles.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: April 14, 2015
    Assignee: Xerox Corporation
    Inventors: Mark E. Mang, Grazyna E. Kmiecik-Lawrynowicz, Mark A. Arnould, Dieu Nguyen
  • Patent number: 9005866
    Abstract: Disclosed are a toner and a preparation method thereof. The toner of the invention has honeycomb-shaped core-shell structured particles. The honeycomb-shaped core-shell structured particles comprise two or more core layers. Each core layer is completely covered by a shell layer.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: April 14, 2015
    Assignee: ICMI (China) Limited
    Inventors: Lanlan Cheng, Xiushan Zhang, Fugen Tang
  • Patent number: 8999620
    Abstract: A toner for electrostatic latent image development, containing toner particles composed of toner core particle containing at least a binder resin and a shell layer coating the toner core particle. Average circularities D4 to D7 of toner particles within predetermined particle diameter ranges are each no less than 0.960, the difference (Dmax?Dmin) between a maximum value Dmax among D4 to D7 and a minimum value Dmin among D4 to D7 is no greater than 0.015. The shell layer is smoothened to a predetermined level. And, cracks in a direction approximately perpendicular to a surface of the toner core particles are observable inside the shell layer when cross-section of the toner particle is observed using a transmission electron microscope.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: April 7, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Takanori Tanaka, Yukinori Nakayama, Hiroaki Moriyama, Takeo Mizobe, Hiroki Uemura
  • Patent number: 8999619
    Abstract: A toner for electrostatic latent image development is comprised toner particles containing toner core particle containing at least a binder resin and a shell layer coating the toner core particle. The shell layer is smoothened to a predetermined level. The average particle diameter of the resin fine particles is from 45 nm to 300 nm. And, when cross-sections of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observable inside the shell layer.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: April 7, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hiroaki Moriyama, Yukinori Nakayama, Takeo Mizobe, Takanori Tanaka, Hiroki Uemura
  • Patent number: 8980515
    Abstract: A magnetic toner for electrostatic latent image development includes toner particles containing toner core particle containing at least a binder resin and a magnetic powder, and a shell layer coating the toner core particle. In the toner, in the case where the surfaces of the shell layers are observed using a scanning electron microscope, the magnetic powder is not observed, and approximately spherical particles derived from the resin fine particles are not observed on the surfaces of the shell layers for toner particles having a particle diameter in a specific range. In the toner, in the case where the cross-sectional surfaces of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observed inside the shell layers.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: March 17, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Takeo Mizobe, Yukinori Nakayama, Hiroaki Moriyama, Takanori Tanaka, Hiroki Uemura
  • Patent number: 8980517
    Abstract: A toner having good development durability, storage stability, environmental stability, and low-temperature fixability is provided. The toner contains toner particles each including a surface layer that contains an organic silicon polymer. The organic silicon polymer contains a unit having a specific structure. The average thickness Dav. of the surface layers is a specific value and the silicon concentration determined by ESCA is 2.5% or more. The toner has a shape factor SF-2 of 140 or more and 260 or less and an average circularity of 0.970 or more and 0.990 or less.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: March 17, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shintaro Kawaguchi, Katsuyuki Nonaka, Koji Abe, Naoya Isono, Yuhei Terui, Taiji Katsura, Akira Sugiyama
  • Patent number: 8980514
    Abstract: A toner for electrostatic latent image development is comprised toner particles containing toner core particle containing at least a binder resin and a shell layer coating the toner core particle. The shell layer is smoothened to a predetermined level. And, when cross-sections of the toner particles are observed using a transmission electron microscope, cracks approximately perpendicular to surfaces of the toner core particles are observable inside the shell layer.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 17, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Yukinori Nakayama, Hiroaki Moriyama, Takeo Mizobe, Takanori Tanaka, Hiroki Uemura
  • Patent number: 8980516
    Abstract: An electrostatic charge image development toner contains a plurality of toner particles. The plurality of toner particles are each formed to have resin particulates in a surface layer. The resin particulates each include a particulate core and a coating layer covering the particulate core. The particulate core contains a quaternary ammonium salt functional group-containing resin. The coating layer contains one or more resins selected from the group consisting of (meth)acrylic resins and styrene-(meth)acrylic resins.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: March 17, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Seiji Kikushima
  • Patent number: 8962230
    Abstract: An electrostatic-image developing toner contains an amorphous polyester resin that has repeating units having a backbone derived from dehydroabietic acid in a main chain thereof and that has a weight average molecular weight of about 30,000 to about 80,000; and at least one of a crystalline polyester resin containing a dicarboxylic acid (C10) and a diol (C9) as polymerization components and a crystalline polyester resin containing a dicarboxylic acid (C9) and a diol (C10) as polymerization components.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: February 24, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Shigeru Seitoku
  • Patent number: 8936895
    Abstract: To provide a toner, which contains: base particles each having a core-shell structure, where a core of the base particle contains crystalline polyester, non-crystalline polyester, a colorant, and a releasing agent, and a shell of the base particle contain a resin, wherein the toner has thermal hardness of 0.5 to 1.8, wherein the toner has a softening index of 80° C. to 95° C., and wherein the toner has thermal retentiveness of 30° C. to 50° C.
    Type: Grant
    Filed: October 7, 2011
    Date of Patent: January 20, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Hideki Sugiura
  • Patent number: 8900784
    Abstract: To provide a toner which contains a binder resin, a colorant, and capsules, wherein the binder resin contains a thermoplastic elastomer, and wherein the capsules each encapsulate a plasticizer capable of softening the thermoplastic elastomer and the capsules are fractured upon application of predetermined pressure.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: December 2, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuo Katano, Yukimichi Someya, Shinji Tezuka, Fuminari Kaneko, Kohji Takeuchi, Kohji Matsuoka, Takuma Nakamura, Tsuneo Kurotori, Hidekazu Yaginuma
  • Publication number: 20140342279
    Abstract: A method for making polymer-encapsulated metallic ink particles is disclosed herein. An ethylene-based polymeric resin powder is formed, and is mixed with a metallic pigment powder to form a powder mixture. The powder mixture is melted to form a metallic polymer melt. A non-polar carrier is added to the metallic polymer melt to form a slurry. The slurry is processed in a microfluidizer.
    Type: Application
    Filed: January 5, 2012
    Publication date: November 20, 2014
    Inventors: Doris Chun, Hou T. Ng, Albert Teishev
  • Patent number: 8889330
    Abstract: A toner including a mother toner particle having a core-shell structure formed of a core containing a binder resin, a coloring agent, and an optional releasing agent, and a shell having a layer thickness of from 0.01 to 2.00 ?m, the core having a softening index of from 60 to 85° C. as measured by a flow tester, and the shell having a thermal hardness of from 0.7 to 1.8 m, and an optional external additive.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: November 18, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideki Sugiura, Yuka Mizoguchi
  • Patent number: 8871418
    Abstract: A toner containing: a core containing at least a first binder resin, a colorant, and a releasing agent; and a shell containing at least a second binder resin; wherein the toner has a core-shell structure, and has a softening index of 86° C. to 95° C. and a thermal hardness of 0.7 to 1.8.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: October 28, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideki Sugiura, Yuka Mizoguchi
  • Patent number: 8865387
    Abstract: The present invention relates to, in the toner including toner particles having a biding agent resin, colorings and a release agent, an electrostatic image developing toner, its composition, and a preparation method thereof. The electrostatic image developing toner is prepared by the method comprising: (1) preparing an inorganic dispersion medium; (2) dispersing/dissolving a polymerizable monomer mixture; (3) micronizing the liquid obtained in step (2) in the liquid obtained in step (1) with high shear force in order to create droplets; (4) performing radical polymerization of the micronized droplets obtained in step (3); (5) aggregating particles obtained in step (4); (6) fusing the aggregate obtained in step (5); (7) cleaning and drying the toner obtained by step (6); and (8) adding additives to impart electrification and fluidity to a toner obtained by step (7).
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: October 21, 2014
    Assignee: Park & OPC Co., Ltd
    Inventors: Jae-Goang Yu, Ho-Geun Jo
  • Publication number: 20140308611
    Abstract: It is an object of the present invention to provide a toner capable of being fixed at low energy and forming an image with high resistance to external forces, such as rubbing and scratching. The object is achieved by a toner including toner particles that contain a binder resin and a colorant, a sea-island structure including a sea portion composed of the crystalline resin C serving as a main component and island portions composed of the amorphous resin A serving as a main component is observed at the observation of a cross section of each of the toner particles.
    Type: Application
    Filed: June 27, 2014
    Publication date: October 16, 2014
    Inventors: Tsutomu Shimano, Shintaro Noji, Hitoshi Itabashi
  • Patent number: 8859176
    Abstract: A toner contains a binder resin and a polyalkylene, wherein the following formula is satisfied: 2?A/B?100 where A represents a reflectance at a light-receiving angle of +30° and B represents a reflectance at a light-receiving angle of ?30°, A and B being measured when a solid fixed image formed by the toner is irradiated with incident light at an incident angle of ?45° using a goniophotometer.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: October 14, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Kadokura, Masaru Takahashi, Shotaro Takahashi, Shuji Sato
  • Patent number: 8852836
    Abstract: A toner including: a base resin; and charge-controlling resin particles contained in the base resin, wherein the toner is in shape of particles, and the charge-controlling resin particles are present in a region of each toner particle which is 500 nm in depth from a surface of the toner particle and an average of amounts of the charge-controlling resin particles present in the regions of the toner particles is 20% by volume to 70% by volume, wherein an average of embedment rates of the charge-controlling resin particles in the toner particles is 90% or higher, where each embedment rate is an average of embedment rates of the charge-controlling resin particles in each toner particle, and wherein the charge-controlling resin particles have a charge amount of 60 ?C/m2 or more as measured by a blow-off method.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: October 7, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Seki, Yoshitaka Sekiguchi, Ryota Inoue, Kazuoki Fuwa
  • Patent number: 8835089
    Abstract: A toner containing toner base particles and an external additive, wherein regions with different tribocharging polarities with respect to a magnetic carrier are present in a domain-matrix structure on the surface of the toner base particles. The island region B has a predetermined height, the external additive has a reverse polarity to the region B in terms of tribocharging polarity to the magnetic carrier, the external additive contains a first external additive having a number-average primary particle size of 80-150 nm and a second external additive having a number-average primary particle size of 10-60 nm, and an average coverage Cb (%) with the first external additive in the region B is 27-100% and a coverage Ca (%) with the first external additive in the sea region A is 12% or less.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: September 16, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Emi Hagiwara, Yasunori Chigono, Hirokazu Usami, Manami Haraguchi, Ryo Inoue, Shintaro Ishida, Tomoaki Miyazawa
  • Patent number: 8802344
    Abstract: A process for making toner particles is provided. In embodiments, a suitable process includes adding a washing aid agent to toner particles at the time of washing the toner particles prior to their drying and recover. The washing aid agent assist in the removal of ionic species, including surfactants and ions that are part of the emulsion aggregation process, from the resulting toner particles. Utilization of the washing aid agent produces toner particles having improved charging characteristics.
    Type: Grant
    Filed: December 13, 2010
    Date of Patent: August 12, 2014
    Assignee: Xerox Corporation
    Inventors: Zhen Lai, Chieh-Min Cheng, Zhaoyang Ou, Christopher D. Blair
  • Patent number: 8795938
    Abstract: To provide a toner, which contains: toner base particles each containing a binder resin and a colorant; and an external additive containing inorganic particles and fatty acid metal salt particles, wherein the inorganic particles contain at least hydrophobic silica particles, wherein a liberation ratio Ya of the hydrophobic silica particles from the toner is 1% by mass to 20% by mass, and wherein a libration ratio Yb of the fatty acid metal salt particles from the toner is 30% by mass to 90% by mass.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: August 5, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Osamu Uchinokura, Tomoyuki Satoh, Takahiro Honda, Daisuke Inoue, Mamoru Hozumi
  • Patent number: 8785094
    Abstract: An electrostatic latent image developing toner contains toner particles that contain a binder resin and a pigment; and an external additive that contains inorganic particles, a ratio (C/D) of an average maximum thickness C to an average equivalent circle diameter D in the toner particles is from 0.05 to 0.7, the inorganic particles include silicone oil-treated inorganic particles in which the amount of free silicone oil with respect to the inorganic particles is from 0.1% by weight to 10% by weight, and the amount of the silicone oil-treated inorganic particles added with respect to 100 parts by weight of the toner particles is from 0.1 part by weight to 10 parts by weight.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: July 22, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Shuji Sato, Atsushi Sugitate, Masaru Takahashi, Shotaro Takahashi
  • Publication number: 20140199625
    Abstract: A process for making a latex emulsion including contacting at least one amorphous polyester resin with at least two organic solvents to form a resin mixture, adding a neutralizing agent, and deionized water to the resin mixture, removing the solvent from the formed latex, and separating the solvent from water. Further, the process is carried out above the resin Tg for making the latex, which drives the latex particle size under 100 nm, where toners made from the latex show improved charging performance.
    Type: Application
    Filed: January 15, 2013
    Publication date: July 17, 2014
    Applicant: XEROX CORPORATION
    Inventors: Shigang Qiu, Richard PN Veregin, Kimberly D. Nosella, Santiago Faucher, Cuong Vong, Enno E. Agur
  • Patent number: 8771914
    Abstract: The present invention provides a toner which, despite its spherical shape, makes it possible to prevent an external additive from being embedded in the toner easily or by a load generating low stress, reduce variation in image density, maintain cleaning ability and transfer ability throughout its long-term use and obtain excellent image quality, and further, provides a two-component developer, an image forming method and an image forming apparatus with the use of the toner. There is a toner including: base particles including a colorant and a resin, and hard fine particles, wherein the base particles and the hard fine particles are mixed together, and protruding portions formed of fine organic resin particles which are different in composition from a resin contained as a main component in the base particles are provided on surfaces of the base particles.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: July 8, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Akihiro Kotsugai, Hiroshi Yamashita
  • Patent number: 8765218
    Abstract: The presently disclosed embodiments are directed generally to methods for making the core-shell fluorinated particles which are incorporated into the overcoat layers of an electrophotographic imaging member to reduce torque and cleaning failures during the photoreceptor cleaning process. The core-shell fluorinated particles are core-shell fluorinated nano- or micro-particles encapsulated in a melamine shell. The present embodiments also pertain to processes for making the overcoat layer comprising the core-shell fluorinated particles.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: July 1, 2014
    Assignee: Xerox Corporation
    Inventors: Woo Soo Kim, Nan-Xing Hu, Jennifer A. Coggan, Yvan Gagnon
  • Patent number: 8765346
    Abstract: A magnetic single-component developer includes a spherical toner containing at least a magnetic powder and not containing a release agent in a binder resin, and a nonspherical toner containing at least a magnetic powder and a release agent in a binder resin. According to measurements taken from a scanning electron microscope image taken from 100 toner particles in the magnetic single-component developer, the spherical toner has a circularity of 0.980 or more, the nonspherical toner has a circularity of 0.960 or less, and a particle number ratio (A)/(B) of the number (A) of particles of the spherical toner to the number (B) of particles of the nonspherical toner is 3/7 or more and 5/5 or less.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: July 1, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventors: Takanori Tanaka, Hiroki Uemura
  • Patent number: 8741523
    Abstract: A toner for developing electrostatic image comprising a toner particle containing a binding resin is disclosed. which, and In the toner the binding resin has a domain-matrix structure composed of a high elastic resin composing a domain and a low elastic resin composing a matrix, an arithmetic mean value of ratio (L/W) of the Length L to Width W of the domains is 1.5 to 5.0, domains having Length L in the range of 60 to 500 nm exist 80 number % or more, and domains having Width Win the range of 45 to 100 nm exist 80 number % or more, in a viscoelastic image of a cross section of the toner particle observed via an atomic force microscope.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: June 3, 2014
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Anju Hori, Noboru Ueda, Hiroshi Nagasawa