Toner Having Identified External Additive On Outside Of Toner Particle (e.g., External Fluidity Agent, External Charge Control Agent, Etc.) Patents (Class 430/123.51)
  • Patent number: 11181843
    Abstract: An electrostatic-image developing toner includes toner particles, layered compound particles, and a free oil. The mass ratio Ma/Mb of the content Ma of the layered compound particles to the content Mb of the free oil is 0.05 or more and 100 or less.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: November 23, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Sakiko Takeuchi, Daisuke Noguchi, Yuka Yamagishi, Yutaka Saito, Kazuhiko Nakamura
  • Patent number: 11036156
    Abstract: A toner is provided which includes: a toner base particle including a binder resin; and an external additive including inorganic particles. A particle size distribution of primary particles of the inorganic particles has a plurality of peaks in the range of from 5 nm through 50 nm. The particle size distribution of the primary particles satisfies all of expressions (1) to (3) below: n1d>n2d??(1); 10<(n1d+n2d)??(2); and 30?{(n2h/n1h)×100}<100??(3), where n1d is a particle diameter (nm) at a peak n1 which is the highest peak among the plurality of peaks and n2d is a particle diameter (nm) of a peak n2 which is the second highest peak among the plurality of peaks, and n1h is a height of the peak n1 and n2h is a height of the peak n2.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: June 15, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Kohtaroh Ogino, Masayuki Ishii, Masayuki Kakimoto, Shohichi Sugimoto
  • Patent number: 9114604
    Abstract: An approach is provided for applying a release agent to a substrate having at least a first surface and a second surface. The approach involves determining a presence of at least one ink image applied to at least one portion of at least one of the first surface and the second surface of the substrate by way of at least one step of a printing process. The approach also involves causing, at least in part, the release agent to be applied to the substrate so as to cover the at least one portion of at least one of the first surface and the second surface of the substrate upon which the at least one ink image is applied.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: August 25, 2015
    Assignee: Xerox Corporation
    Inventors: Jason LeFevre, Paul McConville, James Michael Chappell, Jennifer Rea, James Edward Williams
  • 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: 9005864
    Abstract: A toner including: toner base particles; and an external additive, the toner base particles each comprising a binder resin and a colorant, wherein the external additive comprises non-spherical particles and spherical particles, wherein the non-spherical particles are each a secondary particle in which spherical primary particles are coalesced together, and wherein the non-spherical particles and the spherical particles in the external additive satisfy a relationship expressed by the following formula (1): 3Ca(%)<Cb(%)??Formula (1) where Ca is greater than 10% but smaller than 20% and Cb is greater than 40% but smaller than 70%, and Ca and Cb are values given by: Ca = ( an ? ? amount ? ? of ? ? the ? ? non ? - ? spherical ? ? particles ? ? ( % ? ? by ? ? mass ) / 100 ) × ( a ? ? projected ? ? area ? ? of ? ? the ? ? non ? - ? spherical ? ? particles ? ? ( cm 2 ? / ? g ) ) ( an ? ? amount ? ? of ? ? the
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: April 14, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Syouko Satoh, Tsuneyasu Nagatomo, Satoshi Kojima, Osamu Uchinokura, Junichi Awamura, Daisuke Ito, Satoshi Ogawa, Kiwako Hirohara, Takahiro Honda, Daisuke Inoue
  • Patent number: 9005865
    Abstract: A toner containing toner particles, each of which contains a binder resin and a colorant, and silica particles, wherein the silica particles have a volume average particle diameter (Dv) of 70 nm or more and 500 nm or less, the variation coefficient of diameters of the silica particles, based on volume distribution thereof, is 23% or less, and wherein when the silica particles are heated from 105° C. to 200° C., the ratio of mass decrease is 0.60% or less.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: April 14, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naotaka Ikeda, Emi Watanabe, Yuhei Terui, Taiji Katsura
  • Patent number: 8980519
    Abstract: A toner composition includes a resin, optionally a wax, a colorant, and an acicular surface additive. The toner composition is suitable for use in a single component development system and which composition possesses excellent charging, stability, and flow characteristics.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: March 17, 2015
    Assignee: Xerox Corporation
    Inventors: Juan A. Morales-Tirado, Samir Kumar, Michael F. Zona
  • Patent number: 8974999
    Abstract: Toner compositions that having spherical particles and provide stable density. The toner compositions also comprise and deliver a silicone oil to the cleaning subsystem in the image forming apparatus by incorporating an inorganic fine powder additive package that has been mixed with silicone oil in a manner such that the toner is blended with the inorganic fine powder and silicone oil.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: March 10, 2015
    Assignee: Xerox Corporation
    Inventors: Juan A. Morales-Tirado, Mark E. Mang, Michael F. Zona, Samir Kumar, Susan J. LaFica
  • Patent number: 8956796
    Abstract: Provided is an electrostatic charge image developing toner including toner base particles which contain a polyester resin and a vinyl resin and does not have a coating layer and wherein the concentration of the polyester resin on the particle surface is higher than the concentration of the polyester resin in the inside of the particles, and a sol-gel silica which has an average circularity of from 0.75 to 0.9, on the surface of the toner base particles.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: February 17, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Kadokura, Kazufumi Tomita, Hideaki Yoshikawa
  • Patent number: 8951708
    Abstract: The present embodiments relate to methods of making a toner composition. More specifically, the present embodiments relate to methods of including a functional material into a toner composition.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: February 10, 2015
    Assignee: Xerox Corporation
    Inventors: Yu Liu, Cuong Vong, Sarah Vella, Gregory McGuire, Richard Klenkler, Nan-xing Hu, Paul Gerroir
  • Patent number: 8945806
    Abstract: An electrostatic charge image developing toner includes toner particles that contain a colorant, a binder resin and a release agent, and an external additive, in which the external additive contains inorganic particles including an aliphatic alcohol having 5 or more carbon atoms and a melting point of 20° C. or lower on the surfaces thereof.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: February 3, 2015
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Eiji Kawakami, Shintaro Anno, Hirokazu Hamano, Michio Take
  • Patent number: 8911923
    Abstract: The toner for developing an electrostatic charge image includes toner particles containing a colorant, a binder resin, and a release agent, and an external additive, wherein the external additive contains inorganic particles having fluorine atom-containing oil on the hydrophobization-treated surfaces.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: December 16, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yoshifumi Iida, Eiji Kawakami, Shintaro Anno, Masahiro Takagi
  • Publication number: 20140363762
    Abstract: A two-component developing agent for developing an electrostatic latent image includes toner particles composed of toner base particles and an exterior additive attached on the toner base particles, and carrier particles composed of carrier core particles and a coating resin provided on the carrier core particles. The coating resin includes a sulfur atom and a resin obtained by polymerizing an isobutyl methacrylate monomer, and the toner base particles include a sulfur atom.
    Type: Application
    Filed: May 28, 2014
    Publication date: December 11, 2014
    Applicant: Konica Minolta, Inc.
    Inventors: Kosuke NAKAMURA, Yoshiyasu MATSUMOTO, Satoshi UCHINO, Hidehito HARUKI, Hiroyuki KOZURU
  • Patent number: 8846288
    Abstract: When being blended in a toner, a barium titanate external additive for toner enhances, in particular, the toner fluidity, electrical properties, and other relevant performance; concurrently achieves high image density and reduced background fog in a printer using the toner; and further reduces image defects, such as void, fading, and the like. An industrially advantageous producing method of the barium titanate external additive for toner is also provided. The external additive for toner of the present invention includes spherical barium titanate having a specific gravity of 5.6 g/ml or less.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: September 30, 2014
    Assignee: Nippon Chemical Industrial Co., Ltd.
    Inventors: Kazuo Ochiai, Shinji Tanabe, Naoaki Narishige
  • Publication number: 20140234766
    Abstract: A toner T1 develops an electrostatic latent image, the toner T1 having relieved charge-up characteristics, improved development characteristics, and improved transfer characteristics. The toner T1 may ensure high charge stability against environmental condition changes, and an appropriate amount of charges at a high printing speed, may reduce background contamination on a photoreceptor, may prevent undesirable fusing onto a blade even after prolonged printing, and may have high transfer efficiency and high image uniformity. The toner T1 may have effective flowability and transportability, and may have good storage stability, so as to be unlikely to cause blocking when stored for an extended time.
    Type: Application
    Filed: January 29, 2014
    Publication date: August 21, 2014
    Applicant: SAMSUNG Electronics Co., Ltd.
    Inventors: Se-young YOON, Sung-jin PARK, Seung-sik WOO, Hae-ree JOO
  • Patent number: 8758967
    Abstract: A transparent toner for developing an electrostatic latent image includes toner particles containing a binder resin; and an external additive containing cerium oxide, in which a content of cerium in all toner particles is from 0.05% by weight to 0.20% by weight, the cerium oxide contains a praseodymium, and a content of praseodymium in all toner particles is from 0.001% by weight to 0.050% by weight.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: June 24, 2014
    Assignee: Fuji Xerox Co., Ltd
    Inventors: Koji Sasaki, Masanobu Ninomiya, Tetsuya Taguchi, Atsushi Sugawara, Yukiaki Nakamura
  • Patent number: 8741528
    Abstract: An electrostatic charge image developing toner including toner particles containing a colorant, a binder resin and a release agent; and an external additive, in which the external additive contains inorganic particles having hydrocarbon oil that contains a saturated hydrocarbon having a ring structure on the surfaces thereof.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: June 3, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Shintaro Anno, Yoshifumi Iida, Eiji Kawakami, Masahiro Takagi
  • Patent number: 8735034
    Abstract: A toner for electrostatic image development containing toner matrix particles having at least a resin binder and a colorant, and an external additive, the external additive having composite oxide particles (an external additive A) that have titania and silica, wherein the external additive A has a core-shell structure in which a core portion has the titania and a shell portion has the silica, wherein the titania is present in the external additive A in an amount of from 75 to 95% by weight, and the resin binder comprising a polyester obtained by polycondensing a carboxylic acid component comprising an isophthalic acid compound and an alcohol component (a polyester A).
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: May 27, 2014
    Assignee: Kao Corporation
    Inventors: Masahito Yamazaki, Satoshi Kunii
  • Patent number: 8735036
    Abstract: An electrostatic charge image developing toner includes: toner particles; and an external additive having an average particle diameter of from about 70 nm to about 420 nm, an average circularity of equal to or less than about 0.9, and a standard deviation of the circularity of greater than 0.2.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: May 27, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Katsuyuki Kitajima, Yutaka Saito, Sakon Takahashi, Michio Take
  • Patent number: 8728695
    Abstract: An electrostatic charge image developing toner includes toner particles containing a colorant, a binder resin, and a release agent; and an external additive, wherein the external additive contains inorganic particles which include a compound represented by Formula (1) below on the surfaces thereof: wherein in Formula (1), R1 and R8 each independently represents an alkyl group, R2 to R7 each independently represents an alkyl group or a substituted or unsubstituted phenyl group, and at least three groups of R2 to R7 each independently represents a substituted or unsubstituted phenyl group.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: May 20, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Eiji Kawakami, Shintaro Anno, Hirokazu Hamano
  • Patent number: 8722301
    Abstract: A transparent electrostatic charge image developing toner satisfies the relationships of the following Formulas (1), (2), and (3) wherein Dt (?m) is a volume average particle diameter, upper GSDv is an upper volume particle size distribution index, and lower GSDp is a lower number particle size distribution index: 18?Dt?30;??Formula (1): 1.05?upper GSDv?1.20;??Formula (2): 1.29?lower GSDp?1.50??Formula (3).
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: May 13, 2014
    Assignee: Fuji Xerox Co., Ltd
    Inventors: Tsuyoshi Murakami, Satoshi Yoshida
  • Patent number: 8722293
    Abstract: An electrostatic charge image developing toner includes toner particles, and an external additive. The toner particles are (1) prepared by forming aggregated particles by aggregating resin particles in a raw material dispersion in which the resin particles are dispersed, and causing the aggregated particles to coalesce by heating an aggregated particle dispersion in which the aggregated particles are dispersed so as to form the toner particles, or (2) obtained by kneading and pulverizing a material including a binder resin and a release agent, and the external additive is silica particles having an average diameter in the range of 100 nm to 500 nm, an average circularity in the range of 0.5 to 0.85, and an average of a ratio of a circle-equivalent diameter Da obtained by plane image analysis to a maximum height H obtained by 3-D image analysis of greater than 1.5 and less than 1.9.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: May 13, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yoshifumi Iida, Hideaki Yoshikawa
  • Patent number: 8715898
    Abstract: An electrostatic charge image developer includes a toner for developing an electrostatic charge image, containing toner particles including a polyester resin having a rosin skeleton and an external additive, and a carrier having core material particles and a coating resin layer which coats the surface of the core material particles, in which the hardness of the coating resin layer is from 1.2 times to 2.0 times that of the toner particles.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: May 6, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Kazuhiko Yanagida
  • Patent number: 8703375
    Abstract: To provide a toner A containing: base particles, each containing polyester, microcrystalline wax, and a colorant; and spherical silica particles having an average primary particle diameter of 100 nm to 150 nm, wherein the microcrystalline wax has an onset temperature of 45° C. to 60° C. as determined by DSC, and a carbon number distribution of 25 to 55.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: April 22, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Naohito Shimota, Takahiro Honda, Tsuneyasu Nagatomo, Ryuta Chiba
  • Patent number: 8673532
    Abstract: A method for producing dry toner particles that have similar particle size and shape characteristics as chemically produced toners. The method includes melt-mixing a toner resin with a colorant and, optionally, a wax, to form a toner; grinding the toner to form toner particles; classifying the toner particles into particles averaging 4 to 10 microns in size; blending the classified toner particles with additives in a high-speed blender; and then processing the mixture with optional additional surface additives in a conical mixer. The method produces toner particles that have high circularity and sharper particle size distribution. The surface processing of the toner particles does not affect the internal constituents of the toner particles.
    Type: Grant
    Filed: June 26, 2012
    Date of Patent: March 18, 2014
    Assignee: Xerox Corporation
    Inventors: Paul Casalmir, Bryan L. Norcott
  • Patent number: 8652737
    Abstract: A toner which has i) toner base particles containing at least a binder resin and a colorant and ii) a fatty acid metal salt composition as an external additive. The fatty acid metal salt composition contains a nonionic surface-active agent and a fatty acid metal salt. This toner and an image forming process making use of the toner can keep the toner from adhering to a toner carrying member throughout running, promise a stable chargeability of the toner and can keep any deterioration of halftone image quality from being caused by excess charging of the toner and any image fog from being caused by insufficient charging of the toner.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: February 18, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Handa, Naoya Isono, Katsuyuki Nonaka, Koji Abe, Yasuhiro Hashimoto, Akira Sugiyama, Yuhei Terui
  • Patent number: 8652739
    Abstract: The present invention provides a toner for developing an electrostatic charge image including toner particles having residual ammonium ions and silica particles containing a chlorine compound as an external additive.
    Type: Grant
    Filed: February 9, 2011
    Date of Patent: February 18, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hiroko Kobayashi, Yasuhiro Arima
  • Patent number: 8647805
    Abstract: The present disclosure provides processes for producing toners. In embodiments, flow aids are added to a wet cake including the toner particles, prior to drying. The addition of the flow aid improves flow characteristics of the toner, thereby enhancing overall drying time, reducing the amount of coarse particles, and improving yield, without adversely affecting fusing and charging of the toner particles.
    Type: Grant
    Filed: September 22, 2010
    Date of Patent: February 11, 2014
    Assignee: Xerox Corporation
    Inventors: Kimberly D. Nosella, Melanie Lynn Davis, Cuong Vong, Abdisamed Sheik-Qasim
  • Patent number: 8632933
    Abstract: A developer for electrostatic latent image development including a positively chargeable toner and a fatty acid metal salt is used, in which the fatty acid metal salt is a metal salt selected from the group consisting of zinc, calcium, and magnesium salts of fatty acids of 12 to 20 carbon atoms and has a certain volume average particle diameter and particle size distribution.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: January 21, 2014
    Assignee: Kyocera Document Solutions Inc.
    Inventors: Masami Tujihiro, Yukinori Nakayama
  • Publication number: 20140017607
    Abstract: An electrostatic charge image developing toner includes toner particles, and silica composite particles that contain silicon oxide and from 0.001% by weight to 10% by weight of titanium, and have an average particle size of from 30 nm to 500 nm, a particle size distribution index of from 1.10 to 1.50, and an average circularity of from 0.50 to 0.85.
    Type: Application
    Filed: May 9, 2013
    Publication date: January 16, 2014
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi IIDA, Takeshi IWANAGA, Yuka ZENITANI, Daisuke TOMITA
  • Patent number: 8530129
    Abstract: Provided is an image forming method in which hydrophobized calcium carbonate particles having a number average particle diameter of 30 to 300 nm and hydrophobized strontium titanate particles having a number average particle diameter of 30 to 300 nm are applied to the surface of an image bearing member.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: September 10, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masayuki Hama, Masaya Kawada, Masaharu Miura
  • Publication number: 20130216793
    Abstract: A transparent toner for developing an electrostatic latent image includes toner particles containing a binder resin; and an external additive containing cerium oxide, in which a content of cerium in all toner particles is from 0.05% by weight to 0.20% by weight, the cerium oxide contains a praseodymium, and a content of praseodymium in all toner particles is from 0.001% by weight to 0.050% by weight.
    Type: Application
    Filed: July 9, 2012
    Publication date: August 22, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Koji SASAKI, Masanobu NINOMIYA, Tetsuya TAGUCHI, Atsushi SUGAWARA, Yukiaki NAKAMURA
  • Patent number: 8512931
    Abstract: A toner comprising toner particles having at least one type of surface additive, the toner particles having an FPIA average circularity of at least 0.95, whereby at least 80% wt of the total amount of surface additives stays onto the surface of the toner particles when an ultrasonic treatment of 4500 to 4700 J/gram of toner is applied; a substrate printed or marked with the above-described toner; and a method for manufacturing a toner, said method including the steps of: mixing a binder resin, a colorant and optionally other additives, thereby forming a mixture, melting, kneading and milling said mixture, thereby obtaining a melted kneaded product, pulverizing said melted kneaded product, adding at least one surface additive before or while bringing the FPIA average circularity of said toner particles to 0.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: August 20, 2013
    Assignee: Xeikon Manufacturing N.V.
    Inventors: Lode Deprez, Werner Op De Beeck, Karlien Torfs
  • Patent number: 8486601
    Abstract: A toner for electrostatic latent image development is disclosed comprising colored particles containing a binder resin and a colorant and external-additive particles attached to the surfaces of the colored particles, wherein the external-additive particles comprise resin particles covered with an inorganic layer, and the resin particles are bound to the inorganic layer by a siloxane bond. A preparation method of the toner is also disclosed.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: July 16, 2013
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Yukio Hosoya, Mikio Kouyama, Kenji Hayashi, Hiroaki Obata, Koji Shibata
  • Patent number: 8372569
    Abstract: A toner is provided including toner particles A having a circularity of greater than 0.93 and not greater than 1.00 and toner particles B having a circularity of from 0.85 to 0.93, wherein the following relationships are satisfied: 70?RA?95, 5?RB?30, 0.014?SD?0.025, and 0.940?ED?0.950, wherein RA (% by number) represents a ratio of a number of the toner particles A to a total number of toner particles included in the toner, RB (% by number) represents a ratio of a number of the toner particles B to the total number of toner particles included in the toner, SD represents a standard deviation of circularity of the toner particles A, and ED represents an average envelope degree of the toner particles B.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: February 12, 2013
    Assignees: Ricoh Company, Ltd., Xeikon Manufacturing N.V.
    Inventors: Hideyuki Yamaguchi, Hachiroh Tosaka, Tomoyuki Satoh
  • Publication number: 20130029259
    Abstract: A developer for electrostatic latent image development including a positively chargeable toner and a fatty acid metal salt is used, in which the fatty acid metal salt is a metal salt selected from the group consisting of zinc, calcium, and magnesium salts of fatty acids of 12 to 20 carbon atoms and has a certain volume average particle diameter and particle size distribution.
    Type: Application
    Filed: July 20, 2012
    Publication date: January 31, 2013
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Masami Tujihiro, Yukinori Nakayama
  • Patent number: 8192910
    Abstract: An image forming method, including charging the surface of an electrostatic latent image bearer by a charger; irradiating the surface of the electrostatic latent image bearer to form an electrostatic latent image thereon; developing the same with a toner to form a toner image; transferring the toner image onto a recording medium; and fixing the toner image thereon, wherein the charger is a charging roller contacting the electrostatic latent image bearer to charge the same, having a ten-point surface roughness of 5 to 30, and the toner includes a binder resin, a colorant, a release agent and an external additive including a composite oxide including titanium oxide in an amount of 80 to 95% by weight and silicon oxide, having a core-shell structure formed of a core including the titanium oxide and a shell including the silicon oxide and has a BET specific surface area of 50 to 100 m2/g.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: June 5, 2012
    Assignee: Ricoh Company, Limited
    Inventors: Hiroaki Katoh, Naoki Nakatake, Masayuki Hagi, Yoshitaka Sekiguchi, Kazuoki Fuwa, Yoshihiro Mikuriya, Hideaki Yasunaga
  • Patent number: 8163450
    Abstract: A toner including toner particles; and external additives including a fatty acid metal salt having an average primary particle diameter of from 0.5 to 1.5 ?m; a positively chargeable particulate inorganic material; and a negatively chargeable particulate inorganic material. An image forming apparatus including a photoreceptor bearing an electrostatic image, and a center feed developing device configured to develop the electrostatic image with a developer including the toner to form a toner image, and a transfer device configured to transfer the toner image onto a receiving material preferably fed at a speed of from 500 to 1700 mm/s. An image forming method including forming an electrostatic image, developing the electrostatic image with the center feed developing device using the toner to form a toner image, and transferring the toner image onto a receiving material preferably fed at a speed of from 500 to 1700 mm/s.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: April 24, 2012
    Assignee: Ricoh Company Limited
    Inventor: Hiroyuki Kishida
  • Patent number: 8163456
    Abstract: An image forming method and image forming apparatus based on the application thereof wherein comet-like deposits do not appear on the surface of the photoreceptor even after prolonged use of small-diameter toner, and there is no dropout or damage on the photoreceptor surface in the image forming process using an intermediate transfer member. This image forming method contains a process wherein the toner developed on an electrophotographic photoreceptor is transferred onto an intermediate transfer member, and the toner contains at least a metallic oxide and metallic soap added as external additive agents, and the protective layer contains a resin component obtained by reaction of at least a curable compound, and alumina particles.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: April 24, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Hirofumi Hayata, Masahiko Kurachi, Toshiyuki Fujita
  • Patent number: 8153343
    Abstract: A toner in which even a toner containing crystalline polyester exhibits excellent fixing property, chargeability, color reproducibility, and long-term stability, as well as a two-component developer, a developing device, and an image forming apparatus are provided. The toner includes toner base particles which contain a colorant and a binder resin containing at least crystalline polyester and an amorphous resin; and a mixed oxide of aluminum oxide and silicon dioxide externally added to the toner base particles, and the toner is so adjusted that the binder resin contains 20% by weight to 50% by weight of the crystalline polyester and that a compositional proportion of aluminum oxide in the mixed oxide of aluminum oxide and silicon dioxide falls within a range of 35% by weight or more and less than 50% by weight.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: April 10, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masahiko Kubo, Satoru Ariyoshi
  • Patent number: 8105743
    Abstract: The present invention provides an organic silicone fine particle for latent electrostatic image developing toners, wherein the organic silicone fine particle has a volume average particle diameter of 0.05 ?m to 6.0 ?m which is obtained by measurement based on Coulter principle, and has a hemispherical polysiloxane cross-linked structure. By mixing an appropriate amount of an organic silicone resin particle formed in a deformed shape (a hemispherical shape) in a toner or developer, the present invention prevents movement of the organic silicone resin particle from surface functional sites, the movement caused by a phenomenon such as detachment thereof from a toner surface or rolling movement on the toner surface, by the effect of its shape, and makes it possible to effectively achieve the expected function.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: January 31, 2012
    Assignee: Ricoh Company, Ltd.
    Inventors: Masayuki Ishii, Ryota Inoue, Yoshihiro Moriya, Shingo Sakashita
  • Patent number: 8092965
    Abstract: Provided is a method for forming an image containing the steps of: (a) forming an electrostatic latent image on an electrostatic latent image carrier; and (b) developing the electrostatic latent image by a two component developer comprising a toner and a carrier, wherein the two component developer is continually replenished in the developing step (b); and the toner includes: colored particles; and external additive particles comprising a complex oxide incorporating silicon atoms and at least one of titanium atoms and aluminum atoms, and a surface existing ratio of the silicon atoms (R2) in a surface of the external additive particles being larger than an average existing ratio of the silicon atoms (R1) in an entirety of the external additive particles.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: January 10, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Masahiro Anno, Masahiko Nakamura, Tsuyoshi Uchida, Kenichi Onaka, Junya Onishi, Naoya Tonegawa
  • Patent number: 8080357
    Abstract: When being blended particularly in a color toner, a barium titanate external additive for toner enhances the toner fluidity, electrical properties, and other relevant performance; concurrently achieves high image density and reduced background fog in a color printer using the toner; and further retains high image quality even under a high-temperature high-humidity environment and a low-temperature low-humidity environment. An industrially advantageous producing method of the barium titanate external additive for toner is also provided. The external additive for toner of the present invention includes spherical barium titanate having undergone coating treatment with a hydrophobicizing agent.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: December 20, 2011
    Assignee: Nippon Chemical Industrial Co., Ltd.
    Inventors: Kazuo Ochiai, Shinji Tanabe, Naoaki Narishige
  • Patent number: 7939235
    Abstract: A toner includes a polyol-based resin having multiple hydroxyl groups in a molecular chain thereof in which a ratio of epoxy group to hydroxyl group is from 0.990 to 1.010. A stirring and transfer device satisfies 1000000??×?×??16000000, wherein ? represents a number of rotation per minute, ? (mm) represents a pitch and ? (mm) represents a transfer path length of the stirring and transfer device. A temperature Tin (° C.) in a development device during stirring and transfer of a two component developing agent satisfies 3020 C.<Tin<60° C., and the toner satisfies Y??0.5X+45, 5?X<40, 5?Y?35, wherein X (%) represents a degree of agglomeration of a mother toner particle and Y (%) represents a degree of agglomeration of the toner which has been preserved at 55° C. for 24 hours.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: May 10, 2011
    Assignee: Ricoh Company Limited
    Inventors: Takahiro Honda, Hiroyuki Fushimi, Fumihiro Sasaki, Hisashi Nakajima, Hiroshi Yamada, Yasuo Asahina
  • Publication number: 20110045401
    Abstract: An image forming apparatus, wherein a surface resistivity Rse[?] of a charger and a volume resistivity Rsw [?·cm] of the composition having a low softening point satisfy the following relationship: 0.8×10?1Rse<Rvw<1.5×10Rse is provided. The image forming apparatus contains a photoreceptor; a charger configured to charge the photoreceptor with a charger contacting thereto; an irradiator configured to irradiate the photoreceptor to form an electrostatic latent image thereon; an image developer configured to develop the electrostatic latent image with a toner to form a toner image on the photoreceptor; a transferer configured to transfer the toner image onto a recording material directly or through an intermediate transferer; and a fixer configured to fix the toner image on the recording material, wherein the toner comprises: a binder resin; a colorant; a composition having a low softening point; and an external additive.
    Type: Application
    Filed: October 26, 2010
    Publication date: February 24, 2011
    Inventors: Hiroyuki MURAKAMI, Masahide Inoue, Chiyoshi Nozaki, Tsuyoshi Nozaki, Atsushi Yamamoto, Takuya Kadota, Mitsuyo Matsumoto, Katsunori Kurose, Yoshimichi Ishikawa
  • Patent number: 7867685
    Abstract: An image forming method, including charging a photoreceptor with a charger contacting thereto; irradiating the photoreceptor to form an electrostatic latent image thereon; developing the electrostatic latent image with a toner to form a toner image on the photoreceptor; transferring the toner image onto a recording material directly or through an intermediate transferer; and fixing the toner image on the recording material, wherein the toner includes a binder resin; a colorant; a composition having a low softening point; and an external additive, and wherein a surface resistivity Rse [?] of the charger and a volume resistivity Rsw [?·cm] of the composition having a low softening point satisfy the following relationship: 0.8×10?1Rse<Rvw<1.5×10Rse.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: January 11, 2011
    Assignee: Ricoh Company, Limited
    Inventors: Hiroyuki Murakami, Masahide Inoue, Chiyoshi Nozaki, Tsuyoshi Nozaki, Atsushi Yamamoto, Takuya Kadota, Mitsuyo Matsumoto, Katsunori Kurose, Yoshimichi Ishikawa
  • Patent number: 7862977
    Abstract: A method to form an image using a trickle developing system, wherein (a) the toner comprises colorant particles with a volume median diameter of 3 to 8 ?m having first inorganic particles on surfaces of the colorant particles to form toner particles; (b) the carrier comprises magnetic particles with a weight average particle diameter (D4) of 20 to 40 ?m having second inorganic particles on surfaces of the magnetic particles to form carrier particles; and (c) an area ratio of element (A) based on a total area of surfaces of the carrier particles is 0.5 to 3.0 area % determined by using an X-ray analysis, provided that element (A) represents one or more elements commonly contained in the first inorganic particles and in the second inorganic particles.
    Type: Grant
    Filed: April 3, 2007
    Date of Patent: January 4, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Makoto Kobayashi, Yoshiyasu Matsumoto
  • Publication number: 20100330488
    Abstract: The present invention is to provide a positively-chargeable toner for developing electrostatic images, which is excellent in reproductivity of thin lines and in durability and has a stable charging ability and flowability over time. A positively-chargeable toner comprises a colored resin particle and external additives, wherein a spherical colloidal silica particle having a number average primary particle diameter of 30 to 80 nm and a triboelectric charge amount of ?50 to +300 ?C/g, and a fumed silica particle having a number average primary particle diameter of 5 to 25 nm are contained as the external additives, and wherein a content of the spherical colloidal silica particle is in the range from 0.3 to 2 parts by weight and a content of the fumed silica particle is in the range from 0.1 to 1 parts by weight with respect to 100 parts by weight of the colored resin particle.
    Type: Application
    Filed: September 26, 2008
    Publication date: December 30, 2010
    Applicant: ZEON CORPORATION
    Inventor: Osamu Ieda
  • Patent number: 7838193
    Abstract: A toner including toner particles including a binder resin, a colorant and a release agent, and an external additive including a first particulate inorganic material having a formula of MgxSiyOx+2y where each of x and y is an integer, and a number average secondary particle diameter of from 0.02 ?m to 2 ?m, wherein the first atomic ratio (Mg/Si)s in a surface portion of the first particulate inorganic material is not greater than (preferably less than) the second atomic ratio (Mg/Si)e in the entire first particulate inorganic material. Alternatively, a toner including toner particles including a binder resin and a colorant, and an external additive which includes a particulate inorganic material having a formula of MgxSiyOx+2y where each of x and y is an integer and which has a surface treated with a fatty acid.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: November 23, 2010
    Assignee: Ricoh Company Limited
    Inventors: Masayuki Hagi, Takuya Kadota, Hiroaki Katoh, Atsushi Yamamoto, Katsunori Kurose, Yoshihiro Mikuriya, Masahide Inoue, Hideaki Yasunaga, Minoru Nakamura, Yoshimichi Ishikawa, Hiroyuki Murakami
  • Patent number: 7826772
    Abstract: An image forming apparatus includes a developing apparatus for developing an electrostatic image with a developer comprising at least a toner and a first external additive, the developing apparatus including a plurality of developing devices, containing toners different in color or lightness from each other, in which at least two developing devices contain a dark color toner and a light color toner which have an identical hue and different lightnesses and the developing device containing the light color toner is subjected to a developing operation prior to another developing device; a first transfer apparatus for sequentially transferring toner images, which have been developed by the plurality of developing devices, onto an intermediary transfer member; and a second transfer apparatus for transferring the toner images from the intermediary transfer member all together onto a transfer medium The first external additive includes particles having an aspect ratio of not less than 1.0 and not more than 1.
    Type: Grant
    Filed: August 7, 2009
    Date of Patent: November 2, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Fumitake Hirobe, Yuichiro Toyohara, Tatsuomi Murayama, Akihiro Noguchi