Metal Oxide Conmpound Adjuvant (e.g., Ai2o3'tio2'etc.) Patents (Class 430/108.6)
  • Patent number: 11243482
    Abstract: A toner includes toner particles. The toner particles each include a toner mother particle. The toner mother particles contain a binder resin and a magnetic powder. The binder resin includes a polyester resin, a vinyl resin, and a block polymer. The block polymer includes a polyester portion, a vinyl polymer portion, and a linker that links the polyester portion and the vinyl polymer portion. The linker is derived from a specific compound having a vinyl group and at least one of a carboxy group and an alcoholic hydroxyl group. The magnetic powder has an octahedral structure.
    Type: Grant
    Filed: June 19, 2020
    Date of Patent: February 8, 2022
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masami Tsujihiro, Ken Maetani
  • Patent number: 11230628
    Abstract: A resin microparticle production method includes a step of pulverizing resin particles having a thermoplastic resin as a forming material and having a BET specific surface area of equal to or more than 5 m2/g using an impact type pulverizer.
    Type: Grant
    Filed: December 25, 2017
    Date of Patent: January 25, 2022
    Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Kenji Gouda, Toshiaki Sugimura, Shinji Ohtomo
  • Patent number: 11188004
    Abstract: An electrostatic image developing toner includes toner particles, layered compound particles, and inorganic particles. The content of titanium in the electrostatic image developing toner is 0.1 ppm or more and less than 1,500 ppm.
    Type: Grant
    Filed: July 27, 2020
    Date of Patent: November 30, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Daisuke Noguchi, Yasuaki Hashimoto, Takashi Inukai, Takuro Watanabe, Sakiko Takeuchi
  • Patent number: 11181842
    Abstract: A two-component developer includes a toner including toner particles and a carrier including carrier particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The external additive includes external additive particles. The external additive particles each include a base containing strontium titanate, a conductive layer covering the base, and a surface treatment layer either directly or indirectly covering the conductive layer. The surface treated layer contains a component derived from a hydrophobizing agent.
    Type: Grant
    Filed: February 4, 2020
    Date of Patent: November 23, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Ryota Kobayashi
  • Patent number: 11156931
    Abstract: A positively charged toner for development of an electrostatic image, containing matrix particles containing at least a binder resin and a release agent, coated with inorganic fine particles, the binder resin containing a crystalline resin, the release agent containing ester wax (W) containing a dipentaerythritol unit as a constitutional component, the inorganic fine particles containing positively charged silica (S1) and negatively charged silica (S2), and the positively charged silica (S1) having an average particle diameter that is smaller than an average particle diameter of the negatively charged silica (S2), and the negatively charged silica (S2) having an average particle diameter of 10 nm or more and 90 nm or less.
    Type: Grant
    Filed: August 13, 2018
    Date of Patent: October 26, 2021
    Assignee: KAO CORPORATION
    Inventor: Shogo Watanabe
  • Patent number: 11131939
    Abstract: A toner including a toner particle that contains a binder resin, and an inorganic fine particle, wherein the inorganic fine particle contains aggregated particles; the aggregated particles contain primary particles of at least one metal salt selected from the group consisting of titanate metal salts and zirconate metal salts; the primary particles have a number-average particle diameter of from 15 nm to 55 nm; the aggregated particles have an aggregation diameter of from 80 nm to 300 nm, the aggregated particles have a volume resistivity of from 2×109 ?·cm to 2×1013 ?·cm; and the aggregated particles cover a surface of the toner particle, and a coverage ratio of the aggregated particles with respect to the surface of the toner particle is from 0.3 area % to 10.0 area %.
    Type: Grant
    Filed: August 26, 2019
    Date of Patent: September 28, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masayuki Hama, Yuto Onozaki, Takeshi Hashimoto, Megumi Shino, Ichiro Kanno, Nozomu Komatsu, Hiroyuki Fujikawa
  • Patent number: 11112710
    Abstract: A toner comprising: a toner particle that includes a binder resin, and an external additive, wherein the toner particle includes a polyester resin on the surface; the toner particle includes a polyvalent metal element; where an electrical resistivity of the polyvalent metal element at 20° C. is denoted by A ?·m, and an amount of the polyvalent metal element in the toner particle is denoted by B ?mol/g, a following relationship is satisfied: 0.025×108?(1/A)×B?4.500×108; the external additive includes silica particles; and the silica particles includes spherical silica particles having a number average particle diameter of from 20 nm to 40 nm.
    Type: Grant
    Filed: March 10, 2020
    Date of Patent: September 7, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenichi Nakayama, Takeshi Kaburagi, Shintaro Kawaguchi, Shota Amano
  • Patent number: 11112714
    Abstract: A toner comprising: a toner particle; and an external additive, wherein the external additive includes spherical silica particles and hydrotalcite particles, a number average particle diameter Da of the spherical silica particles is from 10 nm to 40 nm, a circularity of the spherical silica particles is at least 0.80, and the toner satisfies formula (1) below: {Ga×(1?Ka/100)}/{Gb×(1?Kb/100)}?0.050??(1) wherein Ga: a content of the spherical silica particles with respect to 100 parts by mass of the toner particle; Gb: a content of the hydrotalcite particles with respect to 100 parts by mass of the toner particle; Ka: a fixing ratio (%) of the spherical silica particles on a surface of the toner particle; and Kb: a fixing ratio (%) of the hydrotalcite particles on the surface of the toner particle.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: September 7, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shota Amano, Shintaro Kawaguchi, Kenichi Nakayama
  • Patent number: 11099494
    Abstract: Provided is a magenta toner which is more excellent in durability in a high temperature and high humidity environment than conventional ones. The magenta toner comprises a binder resin, a magenta colorant, a release agent and an external additive. The release agent has a maximum endothermic peak in a range of from 70° C. to 80° C. during temperature increase, in a DSC curve measured by a differential scanning calorimeter. Needle-shaped oxide fine particles having an average long diameter of from 30 nm to 500 nm and an aspect ratio of from 4 to 20 are contained therein. Zinc stearate particles having a number average primary particle diameter of from 0.1 ?m to 5 ?m are contained at an amount of from 0.01 part by mass to 0.5 part by mass with respect to 100 parts by mass of the colored resin particles, as the external additives.
    Type: Grant
    Filed: March 26, 2018
    Date of Patent: August 24, 2021
    Assignee: ZEON CORPORATION
    Inventors: Mayuka Chiba, Hiroshi Nakatani
  • Patent number: 11092907
    Abstract: A toner contains toner particles. The toner particles each include a toner mother particle containing a binder resin and an external additive attached to a surface of the toner mother particle. The external additive contains titanate compound particles doped with lanthanum and a group 5 element in the periodic table as external additive particles. The amount of the lanthanum is at least 1.50% by mass relative to the total mass of the titanate compound particles. The amount of the group 5 element in the periodic table is at least 0.01% by mass and no greater than 0.60% by mass relative to the total mass of the titanate compound particles.
    Type: Grant
    Filed: April 16, 2020
    Date of Patent: August 17, 2021
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Takeo Mizobe, Takeshi Arakawa, Masanori Sugahara, Ryota Kobayashi, Kazuki Ono, Naruo Yabe
  • Patent number: 11079694
    Abstract: A toner for electrostatic charge image development is a toner for electrostatic charge image development including toner particles containing a binder resin and an external additive, wherein the binder resin contains a crystalline polyester resin and an amorphous polyester resin, the external additive includes Al—Si composite oxide particles, and a Si element content of the Al—Si composite oxide particles is in the range of 50 to 90 mass % and a Si element ratio on surfaces of the Al—Si composite oxide particles is in the range of 3 to 35 at %.
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: August 3, 2021
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kenshi Miyajima, Shinya Obara, Ikuko Sakurada
  • Patent number: 11079700
    Abstract: An image forming apparatus is provided that includes: an image bearer; a charger; an irradiator; a developing device containing a toner; and a transfer device. The image bearer has a Martens hardness of from 185 to 250 N/m2. The toner satisfies a relation 0.13?X/Dn?0.16, where X [?m] represents an average value of an amount of deformation of the toner by micro-indentation at when a load reaches 3.00×10?4 N at a loading rate of 3.0×10?5 N/sec under an environment of 32 degrees C. and 40% RH, and Dn [?m] represents a number average particle diameter of the toner. The toner contains an external additive comprising silica particles and particles composed mainly of strontium titanate. The particles composed mainly of strontium titanate further contain a third element M selected from the group consisting of La, Mg, Ca, Sn, and Si.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: August 3, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Keiji Makabe, Tsuneyasu Nagatomo, Kohsuke Satoh, Daichi Hisakuni, Kousuke Suzuki, Shintaro Akiyama
  • Patent number: 11048183
    Abstract: An electrostatic-image developing toner includes toner particles, aggregated silica particles A treated with an oil, and aggregated or non-aggregated silica particles B rendered hydrophobic with a hydrophobizing agent other than an oil. The average particle size Da of the aggregated silica particles A and the average particle size Db of the silica particles B satisfy Da?Db. The electrostatic-image developing toner does not include any external additive other than the aggregated silica particles A or the silica particles B, or the electrostatic-image developing toner includes an external additive other than the aggregated silica particles A or the silica particles B, the other external additive having an average particle size smaller than the average particle size Da.
    Type: Grant
    Filed: February 4, 2020
    Date of Patent: June 29, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Takuro Watanabe, Yoshimasa Fujihara, Daisuke Noguchi, Shintaro Anno, Satoshi Miura
  • Patent number: 11036155
    Abstract: A toner for electrostatic image development contains: toner base particles containing at least a nonionic surfactant, a binder resin, and a release agent; and an external additive. The content of the nonionic surfactant is from 0.05% by mass to 1% by mass inclusive based on the total mass of the toner, and the external additive contains tin oxide particles.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: June 15, 2021
    Assignee: FUJIFILM Business Innovation Corp.
    Inventors: Kazutsuna Sasaki, Yutaka Saito, Kazuhiko Nakamura, Yuka Yamagishi
  • Patent number: 10877386
    Abstract: A toner comprises a toner particle and an external additive, the toner satisfies a certain relationship with regard to ?l (C/m2) and ?s (C/m2). The toner is divided into two groups i.e. a first group and a second group with inertial classifier, the first group including a larger size of the toner particles, and the second group including a smaller size of the toner particles, and the number of the toner particles in the first group being substantially equal to the number of the toner particles in the second group. Then, al (C/m2) represents an absolute value of average surface charge density of the toner included in the first group, and ?s (C/m2) represents an absolute value of average surface charge density of the toner included in the second group.
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: December 29, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ryuji Murayama, Junichi Tamura, Kentaro Kamae, Hayato Ida, Daisuke Yamashita, Masaharu Miura, Takaho Shibata, Wakiko Katsumata, Yuichi Mizo
  • Patent number: 10870105
    Abstract: Metatitanic acid particles have absorption at wavelengths of 450 nm and 750 nm in a visible absorption spectrum, have a surface to which a metal compound having a metal atom and a carbon atom is bonded through an oxygen atom, and satisfy the following inequality: 0.03?A?0.3, wherein A represents a value of {(peak intensity of C—O bond+peak intensity of C?O bond)/(peak intensity of C—C bond+peak intensity of C?C bond} in a C 1s XPS spectrum.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: December 22, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takeshi Iwanaga, Hideaki Yoshikawa, Hiroyoshi Okuno, Yasunobu Kashima, Sakae Takeuchi
  • Patent number: 10859935
    Abstract: A toner includes toner particle containing at least a strontium titanate particle on the surface of the toner particle, and the toner is a water-washed toner from which strontium titanate particle desorbable by water washing are removed by water washing. The water-washed toner contains the strontium titanate particle having a number average particle diameter of primary particle (D1) of 10 nm or more and 150 nm or less, and when the distribution of an Sr element in the water-washed toner in the depth direction is determined, (i) the Sr element abundance on the outermost surface x satisfying 0.00<x?0.80, and (ii) the difference between x and xp “xp?x” satisfying 0.00<xp?x?0.95, where xp is the maximum peak value (atomic %) of the Sr element abundance in the region from the outermost surface to 50 nm.
    Type: Grant
    Filed: August 26, 2019
    Date of Patent: December 8, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takeshi Ohtsu, Tadashi Fukuda, Mikihiro Akasaki, Akinori Miyamoto, Kota Mori, Masami Hano, Takashi Kase, Daisuke Tsujimoto, Ryuichiro Matsuo, Kazuto Hosoi, Yoshihiro Ogawa
  • Patent number: 10843932
    Abstract: The present invention relates to at least one surface-reacted calcium carbonate-comprising mineral material and/or a surface-reacted precipitated calcium carbonate that is/are coated with at least one anionic polymer to obtain a surface-coated calcium carbonate-comprising material as well as to a process for the preparation of the surface-coated calcium carbonate-comprising material. Furthermore, the present invention relates to a process for the purification of water and/or dewatering of sludges and/or suspended sediments and to the use of a surface-coated calcium carbonate-comprising material for water purification and/or dewatering of sludges and/or suspended sediments.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: November 24, 2020
    Assignee: Omya International AG
    Inventors: Martine Poffet, Pascal Jäggi, Daniel E. Gerard, Peter Hess
  • Patent number: 10802423
    Abstract: A printer includes a sheet feeder; an intermediate transfer body; a first image forming device; a second image forming device arranged downstream of the first image forming device; a secondary transfer roller arranged downstream of the second image forming device; and a processor. The processor moves the secondary transfer roller away from the intermediate transfer body, primarily transfers a second toner image onto the intermediate transfer body, rotates the intermediate transfer body until the second toner image reaches the first image forming device, primarily transfers the first toner image onto the intermediate transfer body by superimposing the first toner image on the second toner image, causes the secondary transfer roller to contact the intermediate transfer body, and secondarily transfers the first toner image and the second toner image onto the sheet using the secondary transfer roller. The printer further includes a fixing device.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: October 13, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Masaki Takahashi, Isao Yahata
  • Patent number: 10775710
    Abstract: A toner includes a toner particle containing a binder resin and a silica fine particle A on a surface of the toner particle, wherein D50 on a number basis of the toner is 3.0 to 6.0 the silica fine particle A is a particle having a particle diameter of 80 to 500 nm, the particle diameter being confirmable by observing the toner with a SEM, and when the average coverage with the silica fine particle A determined by image analysis of a particle group of a small particle diameter side of the toner with a SEM is set to Ss and the average coverage with the silica fine particle A determined by image analysis of a particle group of a large particle diameter side of the toner with a scanning electron microscope is set to S1, Ss is 20 to 70 area %, Ss and S1 satisfy S1/Ss?0.80.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: September 15, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kentaro Kamae, Ryuji Murayama, Junichi Tamura, Masaharu Miura, Hayato Ida, Takaho Shibata, Koh Ishigami, Yuichi Mizo
  • Patent number: 10747136
    Abstract: A toner comprising a toner particle having a binder resin and a colorant, and metal titanate fine particles, wherein the toner particle includes a polyvalent metal element having an electric resistivity of from 2.5×10?8 ?·m to 10.0×10?8 ?·m; the amount of the polyvalent metal element in the toner particle is from 0.080 ?mol/g to 20.000 ?mol/g; the metal titanate fine particles have a perovskite crystal structure; and the number average particle diameter of primary particles of the metal titanate fine particles is from 10 nm to 80 nm.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: August 18, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takashi Kenmoku, Shota Amano, Tomohiro Unno, Hirofumi Kyuushima
  • Patent number: 10747132
    Abstract: A toner comprising a toner particle, and strontium titanate, wherein the strontium titanate has a specific number average particle diameter, the strontium titanate has a maximum peak (a) at a diffraction angle (2?) of 32.00 deg to 32.40 deg in CuK? characteristic X-ray diffraction, the half width of the maximum peak (a) is 0.23 deg to 0.50 deg, an intensity (Ia) of the maximum peak (a) and a maximum peak intensity (Ix) in a range of a diffraction angle (2?) of 24.00 deg to 28.00 deg satisfy a specific relationship, the content of strontium oxide and titanium oxide in the strontium titanate is at least 98.0% by mass, and a sum total Et of a rotational torque and a vertical load in powder flowability analysis of the toner is 100 mJ to 2000 mJ.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: August 18, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Toru Takahashi, Hiroki Watanabe, Yoshihiro Ogawa, Daisuke Tsujimoto, Wakashi Iida
  • Patent number: 10734645
    Abstract: A particulate active material for a power storage device positive electrode having a higher energy density is provided, which includes particles of an electrically conductive polymer and a conductive agent, wherein the electrically conductive polymer particles each have a surface coated with the conductive agent.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: August 4, 2020
    Assignee: NITTO DENKO CORPORATION
    Inventors: Yohei Ando, Yoshihiro Uetani
  • Patent number: 10732529
    Abstract: Provided is a positive-charging toner having a toner particle that contains a binder resin, the binder resin contains a polymer A having a first monomer unit derived from a first polymerizable monomer, and a second monomer unit derived from a second polymerizable monomer, the first polymerizable monomer is at least one selected from the group consisting of (meth)acrylic acid esters having a C18 to C36 alkyl group, the content of the first monomer unit in the polymer A is 5.0 to 60.0 mol % and the content of the second monomer unit is 20.0 to 95.0 mol %, SP11 of the first monomer unit and SP21 of the second monomer unit satisfy 3.00?(SP21?SP11)?25.00, and the work function of the toner is 5.0 to 5.4 V.
    Type: Grant
    Filed: June 12, 2019
    Date of Patent: August 4, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Yoshiba, Tomoya Nagaoka, Takashi Matsui
  • Patent number: 10668457
    Abstract: A metatitanic acid particle includes a metal having a hydrocarbon group, which is bonded to a surface of the metatitanic acid particle through an oxygen atom, and absorbs light having a wavelength of 450 nm and light having a wavelength of 750 nm, wherein an element ratio C/Ti between carbon C and titanium Ti in a surface of the metatitanic acid particle is from 0.3 to 1.2, and a reduced amount of C/Ti on the surface of the metatitanic acid particle before and after irradiation with an ultraviolet ray having a wavelength of 352 nm and at an irradiation intensity of 1.3 mW/cm2 for 20 hours is from 0.1 to 0.9.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: June 2, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hiroyoshi Okuno, Hideaki Yoshikawa, Yasunobu Kashima, Takeshi Iwanaga, Sakae Takeuchi
  • Patent number: 10662342
    Abstract: The present invention provides a water-based ink that is excellent in adhesion to a resin printing medium formed of a resin such as polyethylene terephthalate, polyvinyl chloride, polyethylene, polypropylene, nylon, etc., gloss and anti-blocking properties upon storage of the printing medium after printing. The present invention relates to [1] a water-based ink including a colorant, polyester resin particles and modified polyolefin resin particles, in which the polyester resin particles are constituted of a resin containing an amorphous polyester having a glass transition temperature of not lower than 40° C. and not higher than 100° C.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: May 26, 2020
    Assignee: KAO CORPORATION
    Inventors: Hiroto Soma, Hiroshi Mizuhata
  • Patent number: 10599059
    Abstract: A toner is provided. The toner comprises mother particles and an external additive covering the mother particles. The mother particles comprise a binder resin, and the external additive comprises inorganic particles. The inorganic particles comprise small-size inorganic particles having an equivalent circle diameter of from 30 to 70 nm and large-size inorganic particles having an equivalent circle diameter of from 150 to 200 nm and a circularity of 0.85 or more. The large-size inorganic particles are 20 to 70 in number per 100 ?m2 image area of the toner observed with a field-emission scanning electron microscope.
    Type: Grant
    Filed: March 6, 2019
    Date of Patent: March 24, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Namie Suzuki, Kazumi Suzuki, Hisashi Nakajima, Yoshitaka Yamauchi, Kohtaroh Ogino, Akihiro Kaneko
  • Patent number: 10585368
    Abstract: Provided is an electrostatic image developing toner containing toner mother particles having external additives on a surface of the mother particle, wherein the external additives contains calcium titanate particles having an average primary particle size in the range of 50 to 150 nm, and alumina particles; and an average primary particle size of the alumina particles is less than the average primary particle size of the calcium titanate particles.
    Type: Grant
    Filed: November 19, 2018
    Date of Patent: March 10, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventors: Junya Ueda, Shinya Obara, Takuya Takahashi, Ikuko Sakurada, Satoshi Uchino
  • Patent number: 10527962
    Abstract: An electrostatic charge image developing toner includes: a toner particle having average circularity of 0.91 or more and 0.98 or less, a silica particle externally added to the toner particle, and a strontium titanate particle that is externally added to the toner particle, that has an average primary particle diameter of 10 nm or more and 100 nm or less, that has average primary particle circularity of 0.82 or more and 0.94 or less, and circularity that becomes 84% of accumulation of the primary particle of more than 0.92.
    Type: Grant
    Filed: May 3, 2018
    Date of Patent: January 7, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yuka Yamagishi, Moegi Iguchi, Yutaka Saito, Mona Tasaki, Soutaro Kakehi, Sakon Takahashi
  • Patent number: 10508202
    Abstract: The present disclosure relates to silica nanoparticle coatings and articles, such as in particular retro-reflective devices, bearing silica nanoparticle coatings thereon. The present disclosure is also directed to a method for retarding dew formation on the surface of an article, in particular an article comprising a retro-reflective support.
    Type: Grant
    Filed: May 30, 2013
    Date of Patent: December 17, 2019
    Assignee: 3M INNOVATIVE PROPERTIES COMPANY
    Inventors: Naiyong Jing, Christiane Strerath, Michael R. Jost
  • Patent number: 10501637
    Abstract: The invention provides silane-treated forsterite microparticles having a specific surface area of 5 to 100 m2/g, wherein 1 to 5 silyl groups are bound to 1 nm2 of the surface area thereof.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: December 10, 2019
    Assignee: NISSAN CHEMICAL INDUSTRIES, LTD.
    Inventors: Tadayuki Isaji, Masahiro Hida
  • Patent number: 10423087
    Abstract: An electrostatic charge image developing toner includes: a toner particle and a strontium titanate particle that is externally added to the toner particle, in which an average primary particle diameter of the strontium titanate particle that is present on a surface of the toner particle is 30 nm or more and 100 nm or less, and average primary particle circularity is 0.82 or more and 0.94 or less, and in which circularity that becomes 84% of accumulation of the primary particle is greater than 0.92.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: September 24, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Moegi Iguchi, Sakon Takahashi, Soutaro Kakehi, Yuka Yamagishi, Yutaka Saito, Mona Tasaki, Tsutomu Furuta, Tsuyoshi Murakami, Satoshi Kamiwaki
  • Patent number: 10394151
    Abstract: An electrostatic charge image developing toner includes a toner particle; a strontium titanate particle that is externally added to the toner particle and that is doped with a metal element having an electronegativity of 1.3 or less; and a silica particle that is externally added to the toner particle, in which in a case where a detected peak intensity of a metal element having an electronegativity of 1.3 or less is Me-R, a detected peak intensity of strontium is Sr—R, a detected peak intensity of silicon is Si—R, and an element proportion of strontium is Sr—P, Conditions (1) to (3) are satisfied, 0.08 kcps?Me-R?10 kcps,??(1) 0.1%?Sr—P?3.0%, and??(2) 0.15?Sr—R/Si—R?12.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: August 27, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Mona Tasaki, Sakon Takahashi, Moegi Iguchi, Yutaka Saito, Soutaro Kakehi, Yuka Yamagishi
  • Patent number: 10303075
    Abstract: A toner including a toner particle and an external additive, wherein the external additive contains an inorganic fine particle A and a silica fine particle; in a surface of the toner observed using a scanning electron microscope, a number-average particle diameter of primary particle of the silica fine particle is from 5 nm to 50 nm, a number-average particle diameter of primary particle of the inorganic fine particle A is at least 10 nm and less than 60 nm, a coverage ratio X1 of the toner surface covered by the silica fine particle is from 60 area % to 95 area %, the inorganic fine particle A is a fine particle of a titanate having a Group 2 element, and a coverage ratio X2 of the toner surface covered by the inorganic fine particle A is from 5 area % to 40 area %.
    Type: Grant
    Filed: February 23, 2018
    Date of Patent: May 28, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Keisuke Tanaka, Yojiro Hotta, Kazuo Terauchi, Koji Nishikawa, Takaaki Furui, Ryo Nagata, Kazuyuki Sato, Yu Yoshida, Yusuke Kosaki, Masami Fujimoto
  • Patent number: 10254666
    Abstract: Provided is a toner for developing electrostatic images, which is less likely to cause filming, is excellent in printing durability, and is less likely to cause fog under a high temperature and high humidity environment. The toner for developing electrostatic images is a toner containing colored resin particles that contains a binder resin, a colorant and a charge control agent, and external additives, wherein the external additives include at least: silica fine particles A, silica fine particles B, and electroconductive metal oxide fine particles C; wherein the silica fine particles. A and B are silica fine particles surface-hydrophobized with at least one hydrophobizing agent; wherein the electroconductive metal oxide fine particles C have an electrical resistance of 70 ?cm or less and contain antimony-doped tin oxide.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: April 9, 2019
    Assignee: ZEON CORPORATION
    Inventor: Takeru Chiba
  • Patent number: 10241432
    Abstract: An electrostatically charged image developing toner includes a particulate toner matrix containing an external additive on the surface of the particulate toner matrix. The external additive includes silica particles A and silica particles B. The silica particles A have a number average primary-particle diameter in the range of 40 to 100 nm and an average circularity in the range of 0.50 to 0.90, and are surface-modified with silicone oil. The silica particles B have a number average primary-particle diameter of 25 nm or more and smaller than the number average primary-particle diameter of the silica particles A, and are surface-modified with alkylalkoxysilane having a specific structure or silazane.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: March 26, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Shinya Obara, Satoshi Uchino, Junya Ueda, Takuya Takahashi
  • Patent number: 10108099
    Abstract: There is provided a toner including toner base particles and an external additive in which the external additive is prevented from being buried in the base particles. The toner can maintain a high transfer efficiency over an extended period of use. The toner includes: (1) toner base particles containing a cycloolefin copolymer and a polyethylene; or (2) toner base particles whose surfaces contain a resin having an elastic deformation rate of 70% or more and a melting temperature of 125.0° C. or less.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: October 23, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Makoto Fukatsu, Manami Haraguchi, Atsushi Nakamoto, Masayoshi Kato, Kazuhisa Kemmochi, Takahiro Kawamoto, Takeshi Yamamoto
  • Patent number: 10108101
    Abstract: The present disclosure relates to a chemically prepared toner composition including a toner particle having a core including a first polymer binder, an styrene acrylate encapsulated crystalline polyester latex, a pigment, and a shell formed around the core including a second polymer binder and method to make the same. The disclosed method of preparing the toner results in a change in the distribution of the components of the toner particle wherein the lower molecular weight resins, the pigment and the wax are located away from the surface of the toner particle and the pigment is clinging to the edge of the wax domain.
    Type: Grant
    Filed: May 1, 2017
    Date of Patent: October 23, 2018
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Jing X Sun, Cory Nathan Hammond
  • Patent number: 10095141
    Abstract: A toner includes toner particles including particles having a flaky shape and made of bright pigment material and a binder resin coated on the surfaces of the particles. A ratio of an exposed surface area of the particles with respect to a surface area of the toner particles is greater than 0% and equal to or smaller than 20%.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: October 9, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Takashi Urabe
  • Patent number: 10048607
    Abstract: A toner includes first toner particles and second toner particles. Each of the first toner particles includes a plate-like colorant particle covered with binder resin particles, and a volume average size of the plate-like colorant particle is equal to or greater than 6 ?m. Each of the second toner particles includes at least one of a binder resin and a releasing agent and not including a colorant, an aspect ratio of the second toner particles is equal to or smaller than 3, and a content ratio of the releasing agents with respect to the second toner particles is equal to or greater than 4 wt % and equal to or smaller than 24 wt %. A content ratio of the second toner particles with respect to the first toner particles is greater than 1 wt % and equal to or smaller than 75 wt %.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: August 14, 2018
    Assignees: Kabushiki Kaisha Toshiba, Toshiba TEC Kabushiki Kaisha
    Inventors: Junichi Ishikawa, Takashi Urabe, Taishi Takano, Satoshi Araki, Maiko Yoshida
  • Patent number: 10048610
    Abstract: A toner containing a toner particle containing a binding resin and a colorant and an inorganic fine particle, in which the inorganic fine particle is a silica particle containing aluminum and the content of the aluminum in the silica particle is 0.2 ppm or more and 200 ppm or less.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: August 14, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ichiro Kanno, Takeshi Hashimoto, Masayuki Hama, Hitoshi Sano, Nozomu Komatsu, Tsubasa Fujisaki, Takakuni Kobori, Hiroyuki Fujikawa
  • Patent number: 9983493
    Abstract: The present invention is to provide a toner which is able to inhibit the occurrence of fog, which is excellent in intermittent endurance, and which is excellent in followability during toner transfer and is thus excellent in top edge part uniformity in solid pattern printing. Disclosed is a toner for developing electrostatic images, comprising colored resin particles containing a binder resin, a colorant and a release agent, and an external additive, wherein static and kinetic friction coefficients obtained by measuring, using a 3-mm-diameter stainless-steel ball as a contactor, a 55-mm-diameter disk-shaped pellet obtained by pressing 4 g of the toner at 9 MPa for one minute, are 0.220 to 0.320 and 0.190 to 0.270, respectively, and a difference calculated by subtracting the kinetic friction coefficient from the static friction coefficient is 0.010 to 0.090.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: May 29, 2018
    Assignee: ZEON CORPORATION
    Inventors: Hiroshi Nakatani, Takeru Chiba
  • Patent number: 9952522
    Abstract: The present invention is to provide a toner which is able to inhibit the occurrence of fog, which is excellent in intermittent endurance, and which is excellent in followability during toner transfer and is thus excellent in top edge part uniformity in solid pattern printing. Disclosed is a toner for developing electrostatic images, comprising colored resin particles containing a binder resin, a colorant and a release agent, and an external additive, wherein static and kinetic friction coefficients obtained by measuring, using a 3-mm-diameter stainless-steel ball as a contactor, a 55-mm-diameter disk-shaped pellet obtained by pressing 4 g of the toner at 9 MPa for one minute, are 0.220 to 0.320 and 0.190 to 0.270, respectively, and a difference calculated by subtracting the kinetic friction coefficient from the static friction coefficient is 0.010 to 0.090.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: April 24, 2018
    Assignee: ZEON CORPORATION
    Inventors: Hiroshi Nakatani, Takeru Chiba
  • Patent number: 9829821
    Abstract: An image forming apparatus includes a first image forming unit that forms a transparent toner image by using a transparent toner, a second image forming unit that forms a metal-colored toner image by using a metal-colored toner containing a flat metallic pigment, and a fixing device that fixes a toner image to a recording medium as a result of a heating member contacting and heating the toner image. The image forming apparatus has a mode in which the transparent toner image is superimposed upon the metal-colored toner image, and the toner images are fixed by the fixing device.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: November 28, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Yu Tsuda
  • Patent number: 9823596
    Abstract: Provided is an electrostatic image developing toner including a toner mother particle containing a colorant and a binder resin comprising a crystalline resin and an amorphous resin; and an external additive. The external additive includes an inorganic fine particle having a number average major axis in a range of 50 to 100 nm, an average aspect ratio in a range of 3 to 10, and a volume resistivity in a range of 1×1010 to 1×1012 ?·cm in primary particles.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: November 21, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Futoshi Kadonome, Satoshi Uchino, Shinya Obara, Noriyuki Kimpara, Ikuko Sakurada, Takuya Takahashi
  • Patent number: 9726994
    Abstract: An electrostatic charge image developing toner includes toner particles containing a binder resin, and an external additive including silica particles whose compression aggregation degree is from 60% to 95% and particle compression ratio is from 0.20 to 0.40 and polishing agent particles.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: August 8, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yoshifumi Eri, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Tomohito Nakajima, Yuka Zenitani, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
  • Patent number: 9709910
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles. The toner particles each have a toner mother particle and first inorganic oxide particles disposed on a surface of the toner mother particle. The first inorganic oxide particles are contained in the electrostatic latent image developing toner in an amount of no less than 1.0% by mass and no greater than 2.0% by mass relative to mass of the toner mother particles. The toner mother particles have an average roundness of no less than 0.960. The first inorganic oxide particles have an average major axis diameter of no less than 500 nm and no greater than 3,000 nm, an average minor axis diameter of no less than 100 nm and no greater than 250 nm, and an aspect ratio of no less than 2 and no greater than 20.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: July 18, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Noriaki Sakamoto
  • Patent number: 9651882
    Abstract: Disclosed is an electrostatic image developer containing colored resin particles containing a binder resin and a colorant, and an external additive, wherein, as the external additive, the electrostatic image developer contains plate-shaped zinc oxide fine particles having an average longer length of 50 to 2,000 nm and a value S of 0.0001 to 0.03 nm?1, which is a value obtained by dividing an average thickness d of the particles by an average base area A of the particles, and a content of the plate-shaped zinc oxide fine particles is in the range from 0.05 to 1 part by mass, with respect to 100 parts by mass of the colored resin particles.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: May 16, 2017
    Assignee: ZEON CORPORATION
    Inventors: Takeru Chiba, Hiroshi Nakatani
  • Patent number: 9651884
    Abstract: A toner includes toner particles including particles having a flaky shape and made of bright pigment material and a binder resin coated on the surfaces of the particles. A ratio of an exposed surface area of the particles with respect to a surface area of the toner particles is greater than 0% and equal to or smaller than 20%.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: May 16, 2017
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Takashi Urabe
  • Patent number: 9639014
    Abstract: An electrostatic charge image developer includes an electrostatic charge image developing carrier containing a ferrite particle and an electrostatic charge image developing toner containing metallic particles whose resistance is from 1010 ?cm to 1013 ?cm in an electric field of 10,000 V/cm, wherein the electrostatic charge image developing carrier satisfies the following formula (1): 0.9?RB/RA?1.0 (1), wherein RA represents the resistance of the electrostatic charge image developing carrier in an electric field of 2,400 V/cm, and RB represents the resistance of the electrostatic charge image developing carrier in an electric field of 19,200 V/cm.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: May 2, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Yosuke Tsurumi, Motoko Sakai, Takuro Watanabe, Masaaki Usami