Dry Toner Containing A Chemically Identified Magnetic Component Patents (Class 430/106.1)
  • Patent number: 10782623
    Abstract: A toner comprising: a toner particle that contains a binder resin and a colorant: and an external additive, wherein (1) the average circularity of the toner is at least 0.960; (2) the fixing ratio of the external additive on the toner particle is from 75% to 100%; and (3) in a differential curve obtained by the differentiation, by load, of a load-displacement curve where the horizontal axis is load (mN) and the vertical axis is displacement (?m), the load-displacement curve being provided by measurement of the strength of the toner by a nanoindentation procedure, a load A that provides a maximum value in the differential curve in a load region from 0.20 mN to 2.30 mN is from 1.15 mN to 1.50 mN.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: September 22, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Yoshiba, Shohei Tsuda, Mariko Yamashita, Kozue Uratani, Ryo Nagata
  • Patent number: 10450409
    Abstract: Disclosed is a polymer powder having an average particle diameter of 20 ?m to 300 ?m, with a particle diameter of less than 10 ?m of 10 mass % or less, and a particle diameter of greater than 300 ?m of 10 mass % or less. Further, disclosed is a method for preparing a polymer powder, comprising: forming a melt of a polymer; introducing a supercritical fluid into the melt of the polymer to form a mixed composition; and spraying the mixed composition to prepare the polymer powder.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: October 22, 2019
    Assignee: LG HAUSYS, LTD.
    Inventors: Kyoung-Min Kang, Sung-Yong Kang, Jun-Beom Shin, Deok-Ryul Hwang
  • Patent number: 10295920
    Abstract: Provided is toner that contains a toner particle, and an external additive containing a strontium titanate particle, wherein the toner has an average circularity of at least 0.935 and not more than 0.995, the strontium titanate particle has a number-average primary particle diameter of at least 10 nm and not more than 60 nm, the strontium titanate particle has a peak in the range of 39.700°±0.150° and a peak in the range of 46.200°±0.150° in a CuK? x-ray diffraction spectrum obtained in the 2? range of at least 10° and not more than 90° where ? is the Bragg angle, and the ratio of the area Sb of the peak at 46.200°±0.150° to the area Sa of the peak at 39.700°±0.150° is at least 1.80 and not more than 2.30.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: May 21, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Koji Nishikawa, Yojiro Hotta, Kazuo Terauchi, Takaaki Furui, Ryo Nagata, Keisuke Tanaka, Kazuyuki Sato, Yu Yoshida, Yusuke Kosaki, Masami Fujimoto
  • Patent number: 10279577
    Abstract: A 3-D printer includes development stations that electrostatically transfer first and second materials to an intermediate transfer surface. The development stations can each include a photoreceptor supplying the materials to the intermediate transfer surface, and a boosted developer roll supplying the materials to the photoreceptor. The boosted developer roll comprises an outer roll rotating in a first rotational direction to move with movement of the photoreceptor, and a magnetic roll within the outer roll rotating in a second rotational direction opposite the first rotational direction. The magnetic roll comprises alternating permanent magnets. The intermediate transfer surface transfers a layer of the materials to a platen each time the platen contacts the intermediate transfer surface to successively form a freestanding stack of layers on the platen. A bonding station is positioned to apply light and/or heat to the freestanding stack to bond the layers to one another.
    Type: Grant
    Filed: April 22, 2016
    Date of Patent: May 7, 2019
    Assignee: Xerox Corporation
    Inventors: Robert W. Phelps, John R. Uchal, James E. Williams, Paul F. Sawicki
  • Patent number: 10216111
    Abstract: Toner particles contain a core-shell resin particle containing at least one (sulfo) polyester containing a metal on nanoparticle, and a shell containing a metal ion nanoparticle.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: February 26, 2019
    Assignee: Xerox Corporation
    Inventors: Valerie M Farrugia, Alana R Desouza, Sandra J Gardner, Wendy Chi
  • Patent number: 10025210
    Abstract: An electrostatic charge image developing toner includes toner particles, silica particles having an average particle diameter of 80 nm to 200 nm, lubricant particles N which has negatively chargeable property, and lubricant particles P which has positively chargeable property, wherein a content (s) of the silica particles, a content (n) of the lubricant particles N, and a content (p) of the lubricant particles P satisfy relationships of Expression (1): 0.002?p/s?0.2; and Expression (2): 0.02?n/s?0.5.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: July 17, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takeshi Tanabe, Sakon Takahashi, Yasuaki Hashimoto, Masaaki Usami, Yuka Zenitani, Hiroshi Kamada, Moegi Iguchi, Yuta Saeki, Hiroaki Saijo
  • Patent number: 10025213
    Abstract: A toner including a binder resin, wherein the toner includes a tetrahydrofuran (THF)-insoluble component in a range of from 10% by mass through 40% by mass, wherein the toner has a main peak in a range of from 12,000 through 18,000 in a molecular weight distribution of a THF-soluble component as measured by gel permeation chromatography (GPC), wherein the main peak has a half value width in a range of from 20,000 to 50,000, and wherein the toner includes a component having a molecular weight of 2,000 or less in a range of from 10.0% by mass through 20.0% by mass and a component having a molecular weight of 100,000 or more of 8.0% by mass or less.
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: July 17, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahiro Seki, Yoshitaka Sekiguchi, Satoshi Ogawa, Naoko Kitada
  • Patent number: 9971264
    Abstract: The magnetic toner contains a magnetic toner particle having a binder resin and a magnetic body, and inorganic fine particles, wherein the average circularity of the magnetic toner is at least 0.955 and, when classifying the inorganic fine particles, in accordance with the fixing strength thereof to the magnetic toner particle and in the sequence of the weakness of the fixing strength, as first inorganic fine particles, second inorganic fine particles, and third inorganic fine particles, the content of the first inorganic fine particles, the ratio of the second inorganic fine particles to the first inorganic fine particles, and the coverage ratio X are in prescribed ranges.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: May 15, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tomohisa Sano, Yusuke Hasegawa, Shuichi Hiroko, Yoshitaka Suzumura, Keisuke Tanaka
  • Patent number: 9971262
    Abstract: A magnetic toner containing a magnetic toner particle having a binder resin and a magnetic body, and inorganic fine particles, wherein when the inorganic fine particles are classified as first inorganic fine particles, second inorganic fine particles, and third inorganic fine particles in accordance with fixing strength thereof to the magnetic toner particle and in the sequence of the weakness of the fixing strength, the content of the first inorganic fine particles, the ratio of the second inorganic fine particles to the first inorganic fine particles, and the coverage ratio X of coverage of the magnetic toner surface by the third inorganic fine particles are in prescribed ranges.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: May 15, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yusuke Hasegawa, Tomohisa Sano, Shuichi Hiroko, Yoshitaka Suzumura, Keisuke Tanaka
  • Patent number: 9926398
    Abstract: The invention provides composite particles comprising core particles having organosilica particles disposed about the core particles. The invention also provides a process for making the composite particles.
    Type: Grant
    Filed: March 18, 2014
    Date of Patent: March 27, 2018
    Assignee: Cabot Corporation
    Inventors: Qingling Zhang, Bennett Greenwood, Ravi Sharma, Geoffrey D. Moeser
  • Patent number: 9732266
    Abstract: An encapsulated composition for polymerization includes an initiator composition for initiating a polymerization reaction, and a capsule prepared from an elemental metal or fusible alloy having a melting temperature from about 20° C. to about 200° C. A fluid for polymerization includes the encapsulated composition and a monomer. When the capsule melts or breaks open, the initiator is released.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: August 15, 2017
    Assignee: Los Alamos National Security, LLC
    Inventor: Robert E. Hermes
  • Patent number: 9454096
    Abstract: A magnetic toner contains magnetic toner particles containing a binder resin and a magnetic body, and inorganic fine particles present on the surface of the magnetic toner particles, wherein the inorganic fine particles present on the surface of the magnetic toner particles contain metal oxide fine particles, the metal oxide fine particles containing silica fine particles, and optionally containing titania fine particles and alumina fine particles, and a content of the silica fine particles being at least 85 mass % with respect to a total mass of the silica fine particles, the titania fine particles and the alumina fine particles, when a coverage ratio A (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles and a coverage ratio B (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles that are fixed to the magnetic toner particles' surface, the magnetic toner has a coverage ratio A and a coverage ratio B/coverage ratio A in pr
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: September 27, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yusuke Hasegawa, Tadashi Dojo, Michihisa Magome
  • Patent number: 9417542
    Abstract: A magnetic toner contains magnetic toner particles containing a binder resin, a release agent, and a magnetic body, and inorganic fine particles present on the surface of the magnetic toner particles, wherein a ratio of coverage of the magnetic toner particles' surface by the inorganic fine particles is in a prescribed range for the magnetic toner, the inorganic fine particles contain prescribed metal oxide fine particles, with at least 85 mass % of the metal oxide fine particles being silica fine particles, the coefficient of variation on the coverage ratio A is in a prescribed range, the binder resin contains a styrene resin, in a GPC measurement of a THF-soluble matter in the magnetic toner, a peak molecular weight (Mp) of a main peak is in a prescribed range, and a prescribed fatty acid ester compound is incorporated as a release agent.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: August 16, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shuichi Hiroko, Michihisa Magome, Yusuke Hasegawa, Yoshitaka Suzumura
  • Patent number: 9354545
    Abstract: Provided is a developing apparatus, including: a toner for developing an electrostatic latent image; a toner carrier for carrying the toner; and a regulating member for regulating a layer thickness of the toner carried by the toner carrier, in which: the toner includes a toner containing toner particles each containing a binder resin and a magnetic material, and inorganic fine particles present on surfaces of the toner particles; the toner has a dielectric loss factor (??) at a frequency of 100 kHz and a temperature of 30° C. of 0.03 pF/m or more and 0.30 pF/m or less; the toner carrier includes a substrate, an elastic layer, and a surface layer containing a urethane resin; and the urethane resin has a partial structure derived from a reaction between a compound represented by the structural formula (1) and a polyisocyanate.
    Type: Grant
    Filed: December 11, 2014
    Date of Patent: May 31, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takashi Matsui, Michihisa Magome, Kozue Uratani, Atsuhiko Ohmori, Masaki Yamada, Minoru Ito
  • Patent number: 9250550
    Abstract: An electrostatic charge image developing toner includes a toner core including at least a binder resin and a shell layer configured to cover the toner core. The shell layer includes an inner layer and an outer layer. A difference obtained by subtracting a SP value of a material for the inner layer from a SP value of the binder resin, ?SP1, is 0.3 or larger and 1.4 or lower. A difference obtained by subtracting a SP value of a material for the outer layer from the SP value of the material for the inner layer, ?SP2, is 0.5 or larger and 1.6 or lower. The ?SP1 is below the ?SP2.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: February 2, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Syo Sumioka
  • Patent number: 9244371
    Abstract: A magnetic toner contains magnetic toner particles containing a binder resin, a release agent, and a magnetic body and inorganic fine particles present on the surface of the magnetic toner particles, wherein the inorganic fine particles present on the surface of the magnetic toner particles contain metal oxide fine particles, as described in the specification. The coverage ratio of the magnetic toner particles' surface by the inorganic fine particles and the coverage ratio by the inorganic fine particles fixed to the magnetic toner particles' surface reside in a prescribed relationship, the binder resin contains a polyester resin, the release agent contains an ester compound, and an endothermic peak for the magnetic toner has a prescribed value.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: January 26, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yoshitaka Suzumura, Yusuke Hasegawa, Michihisa Magome, Kozue Uratani
  • Patent number: 9235151
    Abstract: A magnetic toner containing: magnetic toner particles containing a binder resin and a magnetic body; and inorganic fine particles, as described in the specification, present on the surface of the magnetic toner particles. A coverage ratio A of the magnetic toner particles' surface by the inorganic fine particles, as described in the specification, and a coverage ratio B of the magnetic toner particles' surface by the inorganic fine particles each of which is fixed to the magnetic toner particles' surface, as described in the specification, have prescribed values and a prescribed relationship in the magnetic toner. The alumina fine particles and/or titania fine particles are present on the surface of the magnetic toner particles as described in the specification.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: January 12, 2016
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Keisuke Tanaka, Michihisa Magome, Yusuke Hasegawa, Tomohisa Sano
  • Patent number: 9217943
    Abstract: The magnetic toner contains magnetic toner particles containing a binder resin and a magnetic body, and inorganic fine particles present on the surface of the magnetic toner particles. The coverage ratio of the magnetic toner particle surface by the inorganic fine particles resides in a prescribed range for this magnetic toner; the binder resin is a styrene resin; the weight-average molecular weight and radius of gyration of the magnetic toner reside in a prescribed relationship; and the viscosity of the magnetic toner at 110° C. resides in a prescribed range.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: December 22, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takashi Matsui, Yusuke Hasegawa, Shotaro Nomura, Michihisa Magome
  • Patent number: 9152065
    Abstract: A magnetic toner includes: magnetic toner particles containing a binder resin and a magnetic body; and inorganic fine particles that are present on the surface of the magnetic toner particles and are not a magnetic iron oxide and magnetic iron oxide particles that are present on the surface of the magnetic toner particles, wherein the inorganic fine particles present on the surface of the magnetic toner particles contain metal oxide fine particles, the metal oxide fine particles containing silica fine particles, and optionally containing titania fine particles and alumina fine particles, and a content of the silica fine particles being at least 85 mass % with respect to a total mass of the silica fine particles, the titania fine particles and the alumina fine particles; when a coverage ratio A (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles and a coverage ratio B (%) is a coverage ratio of the magnetic toner particles' surface by the inorganic fine particles th
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: October 6, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tomohisa Sano, Michihisa Magome, Yusuke Hasegawa, Atsuhiko Ohmori
  • Patent number: 9097997
    Abstract: A magnetic toner is provided that exhibits an excellent electrostatic offset resistance both initially and after long-term use. The magnetic toner contains: magnetic toner particles containing a binder resin and a magnetic body; and inorganic fine particles present on the surface of the magnetic toner particles, wherein the inorganic fine particles present on the surface of the magnetic toner particles contain a prescribed metal oxide fine particle in a prescribed proportion; the magnetic toner has prescribed numerical value ranges for a coverage ratio A of the magnetic toner particle surface covered by the inorganic fine particles and for a coverage ratio B by the inorganic fine particles that are fixed to the magnetic toner particle surface; the magnetic toner particle contains a crystalline polyester; and measurement of the magnetic toner with a differential scanning calorimeter provides a characteristic differential scanning calorimetric curve.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: August 4, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shotaro Nomura, Michihisa Magome, Yusuke Hasegawa, Takashi Matsui
  • Patent number: 9029055
    Abstract: A magnetic toner which has superior charging stability and charging uniformity, maintains stable developing performance without any dependence on service environments and may less cause any decrease in image density and any image defects such as fog and ghost, the magnetic toner has magnetic toner particles, each of the magnetic toner particles has magnetic toner base particle containing a binder resin and a magnetic material, and an inorganic fine powder, (a) the magnetic toner having, at a frequency of 100 kHz and a temperature of 30° C., a dielectric loss factor (??) of 2.5×10?1 pF/m or more and 7.0×10?1 pF/m or less and a dielectric dissipation factor (tan ?L) of 3.0×10?2 or less, (b) the magnetic toner having, in a dielectric dissipation factor (tan ?) thereof at a frequency of 100 kHz, a maximum value (tan ?H) within the temperature range of 60° C. to 140° C.; and the tan ?H and the tan ?L satisfying (tan ?H?tan ?L)?3.0×10?2.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: May 12, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kozue Aoki, Yusuke Hasegawa, Yoshitaka Suzumura
  • Publication number: 20150086917
    Abstract: Provided are a toner and a two-component developer each of which: shows a small fluctuation in charge quantity and a small fluctuation in image density even under a high-temperature and high-humidity environment; and does not cause any member contamination even after endurance and hence can stably output an image. The toner and the two-component developer each have a feature in that positively chargeable strontium titanate fine particles are added to toner particles having fixed thereto negatively chargeable silica fine particles.
    Type: Application
    Filed: September 11, 2014
    Publication date: March 26, 2015
    Inventors: Yosuke Iwasaki, Nozomu Komatsu, Takakuni Kobori, Kohji Takenaka, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Hiroyuki Fujikawa
  • Patent number: 8883389
    Abstract: An object of the present invention is to provide a developing apparatus which is less affected by usage environments, has high development efficiency for long term use and can provide a high quality image without image density non-uniformity. The present invention relates to a developing apparatus wherein a magnetic toner-carrying member has a work function value at the surface thereof within a specific range, a toner regulating member which regulates toner carried on the magnetic toner-carrying member is made of a specific material at a portion contacting the magnetic toner, the magnetic toner has an average circularity of 0.950 or more and the magnetic toner has a surface tension index within a specific range.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: November 11, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Matsui, Michihisa Magome, Shotaro Nomura, Atsuhiko Ohmori
  • 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
  • Patent number: 8841054
    Abstract: An image-forming method is provided which can provide stable image density irrespective of use environments and does not cause image defects such as fogging, tailing, or transfer voids, even when being applied to a developing sleeve with a reduced diameter. In the image-forming method, a latent image bearing member and a toner bearing member bearing a magnetic toner on its surface and having inside a unit for generating a magnetic field are placed with a predetermined interval, and an alternating field is applied between the latent image bearing member and the toner bearing member, and an electrostatic latent image borne by the latent image bearing member is developed with the magnetic toner. The toner bearing member has a specific diameter, and the magnetic toner has a specific circularity and a specific compressibility. The total energy of the toner measured with a powder flowability measuring apparatus satisfies a specific value.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: September 23, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tadashi Dojo, Michihisa Magome, Eriko Yanase, Takashi Matsui, Tomohisa Sano, Akira Sakakibara, Shuichi Hiroko
  • Patent number: 8835090
    Abstract: An object of the present invention is to provide a developing apparatus which is less affected by usage environments, has high development efficiency for long term use and can provide a high quality image without image density non-uniformity. The present invention relates to a developing apparatus wherein a magnetic toner-carrying member has a work function value at the surface thereof within a specific range, a toner regulating member which regulates toner carried on the magnetic toner-carrying member is made of a specific material at a portion contacting the magnetic toner, the magnetic toner has an average circularity of 0.950 or more and the magnetic toner has a surface tension index within a specific range.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: September 16, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Matsui, Michihisa Magome, Shotaro Nomura, Atsuhiko Ohmori
  • Patent number: 8828633
    Abstract: To obtain a toner which has excellent charge rise and stability, tends to have a sharp charge distribution, has excellent pigment dispersion properties, exhibits no disarray in an image even during a high-speed copying operation, and can stably output high-resolution images. A toner comprising toner particle containing a binder resin, a colorant, resin PA, and resin PB, wherein the resin PA has unit A represented by Formula (1), the resin PB has unit B represented by Formula (2), a content “a” of the unit A in the toner particle is 2.00 ?mol/g or more, and a molar ratio b/a of the content “a” and a content “b” of the unit B in the toner particle is 0.10 or more and 10.00 or less.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: September 9, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hitoshi Itabashi, Takashi Kenmoku, Harumi Takada
  • Publication number: 20140227638
    Abstract: A carrier for use in a two-component developer for developing an electrostatic latent image is provided. The carrier includes a particulate magnetic core; and a cover layer located on a surface of the particulate magnetic core and including a resin and a particulate electroconductive material. The carrier has a BET specific surface area of from 0.8 to 1.6 m2/g.
    Type: Application
    Filed: December 16, 2013
    Publication date: August 14, 2014
    Inventors: Hiroyuki KISHIDA, Shigenori Yaguchi, Hiroshi Tohmatsu, Koichi Sakata, Hitoshi Iwatsuki, Toyoaki Tano, Kenichi Mashiko
  • Patent number: 8735041
    Abstract: A method for producing a low density resin-coated carrier having a small resin amount to a carrier core material and having a uniform resin coating layer formed on the carrier core material is provided. A resin-coated carrier has a carrier core material and a resin coating layer formed on the surface of the carrier core material. The carrier core material has pores and an apparent density of 1.6 g/cm3 to 2.0 g/cm3 and a remanent magnetization of 10 emu/g of less. The resin coating layer is formed by a dry process of adhering resin particles to a surface of the carrier core material and applying heat and impact force to the resin particles. A volume average particle size of the resin particles is less than 1 ?m. A two-component developer containing the resin-coated carrier is charged in a developing device in an image forming apparatus, and an image is formed.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: May 27, 2014
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takanori Kamoto, Takayuki Yamanaka, Osamu Wada, Tadashi Iwamatsu, Nobuyuki Yoshioka
  • Patent number: 8709696
    Abstract: A curable sublimation marking material including at least one curable component and at least one sublimation colorant. Also disclosed is a transfer printing method including applying a curable sublimation marking material in a desired pattern onto a transfer substrate to form an image on the transfer substrate at a first temperature which is below the sublimation temperature of the sublimation colorant; wherein the curable sublimation marking material comprises at least one curable component and at least one sublimation colorant; curing the image on the transfer substrate; and optionally, bringing the transfer substrate into contact with a final image-receiving substrate, optionally applying pressure, and heating to a second temperature which is sufficient to cause the sublimation colorant to sublime and form a permanent image on the final image-receiving substrate.
    Type: Grant
    Filed: August 16, 2010
    Date of Patent: April 29, 2014
    Assignee: Xerox Corporation
    Inventors: Yulin Wang, Ke Zhou, Tie Hwee Ng, Marko Saban
  • Patent number: 8658339
    Abstract: A negative charge controlling agent, wherein: the negative charge controlling agent comprises polycondensation product obtained by a polycondensation reaction of phenols and aldehydes; and the phenols comprises a (A) mononucleus phenolic compound which has one phenolic hydroxy group in which a hydrogen is bonded at the ortho position of a hydroxyl group of the phenolic hydroxy group and a (B) multinucleus phenolic compound which has at least two phenolic hydroxy groups in which a hydrogen is bonded at the ortho position of a hydroxyl group of each of the phenolic hydroxy group; and the content of the (B) phenolic compound in the phenols is 1 to 30 mol %.
    Type: Grant
    Filed: January 21, 2004
    Date of Patent: February 25, 2014
    Assignee: Fujikura Kasei Co., Ltd.
    Inventors: Takayuki Ishimoto, Yutaka Kukimoto, Shinji Yatabe
  • Publication number: 20140017606
    Abstract: A material expressed as a composition formula MXFe3-XO4 (where M is at least one of Mg and Mn, and 0?X?1) is a main component, and as a total amount, 0.1 to 2.5 weight percent of at least one of a Sr element and a Ca element is contained. Here, when ferrite particles are used as a carrier, in terms of obtaining a higher image density, the fluidity of the ferrite particles magnetized under a magnetic field of 1000/(4?) kA/m (1000 oersteds) is preferably 40 seconds or more. The residual magnetization ?r is preferably 3 Am2/kg or more.
    Type: Application
    Filed: March 19, 2012
    Publication date: January 16, 2014
    Applicants: DOWA IP CREATION CO., LTD, DOWA ELECTRONICS MATERIALS CO., LTD.
    Inventors: Tomoya Yamada, Tomohide Iida
  • Patent number: 8617776
    Abstract: A method and system for printing documents with one or more embedded security features is provided. Security features are embedded in the document by co-printing magnetic and non-magnetic toner on a receiver before fixation by a fixing station. The combination of magnetic and non-magnetic toners in the image results in image elements that easily show alteration or are undetectable by visual means.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: December 31, 2013
    Assignee: Eastman Kodak Company
    Inventors: Jason Morgan, John F. Crichton, Raymond Rossborough, Timothy G. Armstrong, Matthias H. Regelsberger
  • Publication number: 20130280648
    Abstract: A toner composition including at least one phosphorescent pigment that absorbs energy released by natural or artificial light, and is able to be seen in a dark environment through luminescence of a certain color created by the energy released as light, and a method of forming and using the toner are described. The phosphorescent toner has a particle size in the range of about 15-40 microns, which allows the toner to have the ability to absorb and then release the needed amount of light energy to be noticeable in a dark environment.
    Type: Application
    Filed: April 18, 2012
    Publication date: October 24, 2013
    Applicant: TROY GROUP, INC.
    Inventors: Carrie A. Gilson, Kevin L. Heilman, Michael R. Rlley
  • Patent number: 8545713
    Abstract: The present invention relates to black magnetic iron oxide particles comprising magnetite as a main component, wherein when the black magnetic iron oxide particles are molded into a tablet shape, an electric resistance value of the tablet in an alternating current electric field is controlled to produce an impedance of not less than 2×106 ?cm as measured in a characteristic frequency range thereof. The black magnetic iron oxide particles according to the present invention can provide a toner capable of exhibiting a good charging performance and a uniform charging property under the high-temperature and high-humidity conditions, so that when developing an electrostatic latent image therewith, it is possible to obtain toner images having a high resolution or definition, and further the use of heavy metal elements in the black magnetic iron oxide particles can be minimized.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: October 1, 2013
    Assignee: Toda Kogyo Corporation
    Inventors: Ryo Iwai, Mamoru Kamigaki, Nobuya Shimo, Naoki Uchida
  • Patent number: 8541152
    Abstract: A magnetic toner for a single component developer includes in a polyester resin at least a nigrosine dye that is immiscible with the polyester resin, a nigrosine dye that is miscible with the polyester resin, and a magnetic powder. The nigrosine dye that is immiscible with the polyester resin has an average diameter of 0.2 to 4 ?m when dispersed in the polyester resin.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: September 24, 2013
    Assignee: Kyocera Document Solutions Inc.
    Inventor: Akinori Koyama
  • Patent number: 8518620
    Abstract: To provide a magnetic toner which: enables a stable image density to be obtained irrespective of a use environment; and exhibits excellent low-temperature fixability, little image deterioration upon fixation, high coloring power, and a reduced toner consumption. The present invention relates to a magnetic toner containing at least: a binder resin; and a magnetic body. The binder resin contains a polyester unit. The toner has a weight average particle size of 5.0 to 9.0 ?m, a true specific gravity of 1.3 to 1.7 g/cm3, and a saturated magnetization of 20 to 35 Am2/kg in a magnetic field of 796 kA/m. The dielectric loss tangent (tan ?) of the toner satisfies (tan ?H?tan ?L)/tan ?L?0.20 at 100 kHz.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: August 27, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tadashi Dojo, Nene Dojo, Tomohisa Sano
  • Patent number: 8512925
    Abstract: Provided is a magnetic toner capable of preventing electrostatic offset while attaining a high image quality by a high speed machine. The magnetic toner comprises magnetic toner particles, each of which contains a binder resin and a magnetic material, and a fine inorganic powder, in which the binder resin contains a polyester unit, and the magnetic toner has a dielectric loss factor at 40° C. and 100 kHz of 0.40 pF/m or more but 1.00 pF/m or less and a dielectric loss factor at 150° C. and 100 kHz of 0.50 pF/m or more but 4.00 pF/m or less.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: August 20, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuhei Moribe, Katsuhisa Yamazaki, Toru Takahashi, Daisuke Tsujimoto, Masami Fujimoto
  • Patent number: 8507166
    Abstract: A toner composition includes resin core particles having outer surfaces, and surface treatment, wherein the surface treatment includes at least first metal oxide particles having a surface area equivalent average particle diameter of greater than 25 nm and a surface energy of less than 28 erg/cm2, as determined by methanol wettability midpoint at 22° C., tacked to the outer surfaces of the resin core particles, at a concentration to provide a total projected area of the first metal oxide particles sufficient to cover at least 10% of the resin core particle outer surfaces area, and wherein the toner composition comprises less than 0.013 g non-tacked surface treatment per square meter of resin core particles outer surface. A developer for developing electrostatic images includes magnetic carrier particles and toner as described above, wherein the developer comprises less than 0.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: August 13, 2013
    Assignee: Eastman Kodak Company
    Inventors: Kevin D. Lofftus, Peter S. Alexandrovich
  • Patent number: 8501377
    Abstract: Provided is a magnetic toner capable of providing a stable image by suppressing sleeve contamination even under a high-temperature and high-humidity environment and under a normal-temperature and low-humidity environment and further suppressing large-particle fogging caused after the toner is left alone for a week. The magnetic toner contains toner particles, each of which contains a binder resin and a magnetic iron oxide particle, in which the binder resin has a polyester unit, the toner has i) a dielectric loss factor at 40° C. and 100 kHz of 0.50 pF/m or more but 0.90 pF/m or less, and ii) a true specific gravity of 1.50 g/cm3 or more but 1.85 g/cm3 or less.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: August 6, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toru Takahashi, Katsuhisa Yamazaki, Shuhei Moribe, Daisuke Tsujimoto, Masami Fujimoto
  • Publication number: 20130196258
    Abstract: A toner includes a binder resin including an amorphous polyester resin (A), a crystalline polyester resin (B), and a polyurethane thermoplastic elastomer (C).
    Type: Application
    Filed: July 24, 2012
    Publication date: August 1, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yoshihiro INABA, Daisuke YOSHINO, Akira IMAI, Takako KOBAYASHI, Koji HORIBA, Masahiro OKI, Ryosaku IGARASHI
  • Patent number: 8475985
    Abstract: Compositions including carbon nanofoam are suitable for printing and magnetic ink.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: July 2, 2013
    Assignee: Xerox Corporation
    Inventors: William G. Herbert, Gary Maier
  • Publication number: 20130157186
    Abstract: A magnetic carrier having excellent charge-imparting ability includes a magnetic particle and a coating layer disposed on a surface of the magnetic particle. The coating layer includes at least a resin component including an acrylic polymer and hydrotalcite dispersed in a form of particles having a predetermined number-average particle. A content of the hydrotalcite CH (parts by weight) is in a range of approximately 3 or more to approximately 30 parts by weight or less based on 100 parts by weight of the resin component. A content of the acrylic monomer unit CA (mol %) with respect to a total monomer unit included in the resin component and the content of the hydrotalcite CH satisfy the following relationship: 78?CH×0.38+CA?99.
    Type: Application
    Filed: December 18, 2012
    Publication date: June 20, 2013
    Applicant: Samsung Electronics Co., Ltd.
    Inventor: Samsung Electronics Co., Ltd.
  • Publication number: 20120322002
    Abstract: The invention provides a toner composition comprising resin particles, a colorant, and a toner additive, wherein the toner additive comprises carbon-silica dual phase particles, wherein the carbon-silica dual phase particles comprise aggregates of carbon black comprising at least one silicon-containing region, and wherein the carbon-silica dual phase particles are distributed on the surface of the resin particles. The invention also provides a method of preparing the aforesaid toner composition.
    Type: Application
    Filed: June 16, 2011
    Publication date: December 20, 2012
    Inventors: Hairuo Tu, Dmitry Fomitchev, Jinsong Liu, Zhifeng Li, James Boswell
  • Publication number: 20120308923
    Abstract: A toner composition includes resin core particles having outer surfaces, and surface treatment, wherein the surface treatment includes at least first metal oxide particles having a surface area equivalent average particle diameter of greater than 25 nm and a surface energy of less than 28 erg/cm2, as determined by methanol wettability midpoint at 22° C., tacked to the outer surfaces of the resin core particles, at a concentration to provide a total projected area of the first metal oxide particles sufficient to cover at least 10% of the resin core particle outer surfaces area, and wherein the toner composition comprises less than 0.013 g non-tacked surface treatment per square meter of resin core particles outer surface. A developer for developing electrostatic images includes magnetic carrier particles and toner as described above, wherein the developer comprises less than 0.
    Type: Application
    Filed: June 30, 2011
    Publication date: December 6, 2012
    Inventors: Kevin D. Lofftus, Peter S. Alexandrovich
  • Patent number: 8298669
    Abstract: A coated carrier that peeling and wearing of a coating layer are hard to be generated and a method of manufacturing the coated carrier are provided. The coated carrier includes a core particle including a magnetic body, a first resin layer coating the core particle, a resin particle layer including a resin particle fixed to the first resin layer as a single layer, and a second resin layer. The first resin layer includes a first resin having a first reactive group. The resin particle layer is formed of resin particles including a cross-linking resin having a second reactive group which can undergo a cross-linking reaction with the first reactive group. The second resin layer is provided so as to fill gaps between the resin particles.
    Type: Grant
    Filed: May 19, 2010
    Date of Patent: October 30, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Yui Kawano
  • Publication number: 20120270146
    Abstract: The present disclosure relates to a process for preparing a polyester-based magnetic toner composition. The toner composition includes one or more polyester amorphous binder resins, optionally a crystalline polyester resin, and spherical barium iron oxide particles. In embodiments, the toner is prepared from barium iron oxide particles that are in a dispersion including water and a dispersant. In yet other embodiments, the process may be conducted under an inert gas such as argon to avoid oxidation of the ferromagnetic particles during toner preparation.
    Type: Application
    Filed: April 20, 2011
    Publication date: October 25, 2012
    Applicant: XEROX CORPORATION
    Inventors: Ke Zhou, Suxia Yang, Cuong Vong, Paul J. Gerroir, Karen Ann Moffat, Gabriel Iftime
  • Publication number: 20120231384
    Abstract: A magnetic toner which has superior charging stability and charging uniformity, maintains stable developing performance without any dependence on service environments and may less cause any decrease in image density and any image defects such as fog and ghost, the magnetic toner has magnetic toner particles, each of the magnetic toner particles has magnetic toner base particle containing a binder resin and a magnetic material, and an inorganic fine powder, (a) the magnetic toner having, at a frequency of 100 kHz and a temperature of 30° C., a dielectric loss factor (??) of 2.5×10?1 pF/m or more and 7.0×10?1 pF/m or less and a dielectric dissipation factor (tan ?L) of 3.0×10?2 or less, (b) the magnetic toner having, in a dielectric dissipation factor (tan ?) thereof at a frequency of 100 kHz, a maximum value (tan ?H) within the temperature range of 60° C. to 140° C.; and the tan ?H and the tan ?L satisfying (tan ?H?tan ?L)?3.0×10?2.
    Type: Application
    Filed: May 25, 2011
    Publication date: September 13, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kozue Aoki, Yusuke Hasegawa, Yoshitaka Suzumura
  • Publication number: 20120202147
    Abstract: An anisotropic magnetic material-dispersed resin carrier including: fine magnetic particles; and a binder resin in which at least the fine magnetic particles are dispersed, wherein the anisotropic magnetic material-dispersed resin carrier has a magnetic anisotropy where magnetic fields of the fine magnetic particles are orientated in the same direction, and wherein the anisotropic magnetic material-dispersed resin carrier has a saturation magnetization of 16 emu/g to 30 emu/g, a coercive force of 15 kA/m to 40 kA/m, and a number average particle diameter of 15 ?m or more but less than 100 ?m.
    Type: Application
    Filed: January 31, 2012
    Publication date: August 9, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Kazumi SUZUKI, Masaki Yoshino, Hisao Kurosu, Tatsuya Morita, Tomoko Kino, Shingo Sakashita
  • Publication number: 20120196219
    Abstract: Provided is a magnetic toner capable of preventing electrostatic offset while attaining a high image quality by a high speed machine. The magnetic toner comprises magnetic toner particles, each of which contains a binder resin and a magnetic material, and a fine inorganic powder, in which the binder resin contains a polyester unit, and the magnetic toner has a dielectric loss factor at 40° C. and 100 kHz of 0.40 pF/m or more but 1.00 pF/m or less and a dielectric loss factor at 150° C. and 100 kHz of 0.50 pF/m or more but 4.00 pF/m or less.
    Type: Application
    Filed: January 19, 2012
    Publication date: August 2, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Shuhei Moribe, Katsuhisa Yamazaki, Toru Takahashi, Daisuke Tsujimoto, Masami Fujimoto