Core-shell Structure Patents (Class 430/110.2)
  • Patent number: 10870307
    Abstract: The invention relates to a security pigment of core-shell particles, comprising a core based on a thermoplastic material, a shell based on a condensation polymer, and an organic or metalorganic feature substance present in dissolved or finely distributed form in the core, wherein the mass fraction of the shell amounts to more than 25%, preferably 50%, particularly more than 100%, in relation to the mass of the core. The invention further relates to a method for producing the core-shell particles and to value documents having the core-shell particles.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: December 22, 2020
    Assignee: GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH
    Inventors: Johann Kecht, Axel Schlossbauer
  • Patent number: 10821766
    Abstract: The invention relates to a security pigment of core-shell particles with an organic or metalorganic feature substance, in particular luminescent feature substance, present in dissolved or finely distributed form in the core. The invention further relates to a method for producing the core-shell particles and value documents having the core-shell particles.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: November 3, 2020
    Assignee: GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH
    Inventors: Johann Kecht, Axel Schlossbauer
  • Patent number: 10795305
    Abstract: An image forming apparatus includes an image carrier; a charging section that charges a surface of the image carrier; an electrostatic charge image forming section that forms an electrostatic charge image on the charged surface of the image carrier; a developing section that has a container containing an electrostatic charge image developer and develops the electrostatic charge image formed on the surface of the image carrier into a toner image using the electrostatic charge image developer, the electrostatic charge image developer including toner for electrostatic charge image development, the toner containing toner particles and an external additive; a transfer section that transfers the toner image formed on the surface of the image carrier to a surface of a recording medium; a cleaning section that has a cleaning blade with which the cleaning section cleans the surface of the image carrier; and a lubricant supplying section that has a lubricant supplying member that supplies a lubricant to the contact por
    Type: Grant
    Filed: August 21, 2019
    Date of Patent: October 6, 2020
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Masataka Kuribayashi, Makoto Kamisaki, Jun Sekiya, Shota Oshima
  • Patent number: 10703830
    Abstract: A process for preparing a (meth)acrylate comprising preparing an aqueous phase by combining water, one or more stabilizing agents, and one or more surfactants; preparing an oil phase by combining one or more free radical initiators, one or more monomers capable of undergoing radical polymerization, one or more crosslinking and/or graft-linking monomers, and stearyl methacrylate and/or lauryl methacrylate, wherein the free radical initiator is capable of partitioning preferentially into the oil phase; combining the aqueous and oil phases and mixing to form a suspension having oil droplets ranging in size from 1 to 10 microns; raising the temperature of the suspension to effect an initial polymerization forming a core polymer is provided.
    Type: Grant
    Filed: November 29, 2015
    Date of Patent: July 7, 2020
    Assignee: Rohm and Haas Company
    Inventors: Carlos A. Cruz, Morris C. Wills
  • Patent number: 10698327
    Abstract: Provided is a toner containing a toner particle including a binder resin, a wax, and a colorant. The softening point of the toner is at least 80° C. and not more than 140° C. The average circularity of the toner is at least 0.940. The integrated value of stress in the toner at 150° C. which is measured by using a tackiness tester is at least 78 g·m/sec.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: June 30, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuujirou Nagashima, Yusuke Hasegawa, Tomohisa Sano, Yoshitaka Suzumura, Satoshi Arimura, Kozue Uratani
  • Patent number: 10551758
    Abstract: Provided is a toner, including a toner particle having: a toner base particle containing a binder resin and a colorant; and protrusion derived from a resin fine particle in a surface of the toner base particle, wherein the protrusion is covered with a condensation product of an organosilicon compound represented by the formula (1), and wherein the resin fine particle is in direct contact with the toner base particle.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: February 4, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Maho Tanaka, Kunihiko Nakamura, Kenta Kamikura, Fumiya Hatakeyama, Akane Masumoto
  • Patent number: 10520844
    Abstract: A toner includes toner particles. The toner particles each include a toner core and a shell layer covering a surface of the toner core. The toner core contains composite particles. The composite particles are particles of a composite of a releasing agent, an electrically conductive polymer, and a dopant. A ratio of an amount of the composite particles to a mass of the toner cores is at least 0.5% by mass and no greater than 15.0% by mass.
    Type: Grant
    Filed: January 28, 2019
    Date of Patent: December 31, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Takatoshi Nozaki
  • Patent number: 10495997
    Abstract: A toner includes toner particles. The toner particles each include a toner core containing a binder resin, a first shell layer covering a surface of the toner core, and a second shell layer partially covering a surface of the first shell layer. The first shell layers include first domains composed of a first thermoplastic resin and second domains composed of a second thermoplastic resin. The first thermoplastic resin has a glass transition point of at least 35° C. and no greater than 66° C. The second thermoplastic resin has a glass transition point of at least 71° C. and no greater than 105° C. The second shell layers contain a third thermoplastic resin that is more hydrophobic than the first thermoplastic resin and the second thermoplastic resin. The third thermoplastic resin has a higher glass transition point than the first thermoplastic resin.
    Type: Grant
    Filed: April 22, 2019
    Date of Patent: December 3, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Kazuki Tsuchihashi
  • Patent number: 10481528
    Abstract: An object of the present invention is achieved by an image forming method containing the steps of: forming a toner image by developing an electrostatic latent image with a toner; transferring the toner image on a recording medium; and fixing the toner image on the recording medium, wherein the fixing step of the toner image on the recording medium further contains the steps of: irradiating light having a wavelength range of 280 to 480 nm to the toner image; and applying pressure to the toner image.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: November 19, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Seijiro Takahashi, Haruo Horiguchi, Toyoko Shibata
  • Patent number: 10444650
    Abstract: Provided is a toner that has a plurality of toner particles. Each toner particle can include a binder resin core and a shell disposed about the binder resin core. The binder resin core can include at least one binder resin. The shell can include a plurality of metal nanoparticles. The binder resin core can be prepared by forming an aggregate of the binder resin in which metallic nanoparticles are not present.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: October 15, 2019
    Assignee: XEROX CORPORATION
    Inventor: Valerie M. Farrugia
  • Patent number: 10444649
    Abstract: A toner includes toner particles. The toner particles each include a composite core and a shell layer covering a surface of the composite core. The composite core is a composite of a toner core and organic particles located on a surface of the toner core. The toner core contains a releasing agent having a carboxyl group. The organic particles contain a resin having a carboxyl group and a mass average molecular weight of from 30,000 to 50,500. The shell layer includes a unit having a non-ring-opened oxazoline group. An amount of the non-ring-opened oxazoline group contained in 1 g of the toner as measured by gas chromatography-mass spectrometry is from 500 ?mol to 1,400 ?mol. An endothermic quantity due to melting of the releasing agent contained in 1 mg of the toner as measured by differential scanning calorimetry is from 80 mJ to 160 mJ.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: October 15, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hiroki Uemura
  • Patent number: 10437175
    Abstract: An image forming method uses a toner including toner particles including a binder resin and an ultraviolet light absorber. Content of the ultraviolet light absorber is within a range of 0.1 to 50 mass % with respect to total mass of the toner particles. The method includes: transferring a toner image formed with the toner on a recording medium; and irradiating the toner image transferred on the recording medium with monochromatic light having a maximum emission wavelength within a wavelength range of 280 to 550 nm to melt and fix the toner image.
    Type: Grant
    Filed: July 5, 2018
    Date of Patent: October 8, 2019
    Assignee: KONICA MINOLTA, INC.
    Inventors: Haruo Horiguchi, Seijiro Takahashi
  • Patent number: 10379453
    Abstract: A toner includes a plurality of first particles and a plurality of second particles. The first particles and the second particles each include a core and a shell layer covering a surface of the core. The cores of the first particles contain a binder resin and a colorant. The cores of the second particles contain a releasing agent. A standard deviation of a volume-based particle size distribution of the toner is no greater than 1.28. An area ratio of regions of the cores of the second particles that are occupied by the releasing agent in a cross-sectional image of the second particles is at least 50%. A number ratio of the second particles is at least 5% and no greater than 25% relative to a total number of the first particles and the second particles.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: August 13, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Haruhiro Nishitera
  • Patent number: 10370383
    Abstract: A process for preparing isosorbide di(meth)acrylate by transesterifying alkyl (meth)acrylate with isosorbide, comprising the steps of: (i) reacting alkyl (meth)acrylate with isosorbide in the presence of a catalyst comprising titanium(IV) or zirconium(IV) and a stabilizer in the presence of an azeotroping agent which forms an azeotrope with the alcohol bound in the alkyl (meth)acrylate, (ii) continuously distilling off the azeotrope of azeotroping agent and alcohol, wherein steps (i) and (ii) are conducted simultaneously until the isosorbide has been essentially fully converted, (iii) adding water to the product mixture which comprises isosorbide (meth)acrylate and is obtained in steps (i) and (ii) and removing the hydrolyzate of the catalyst comprising titanium(IV) or zirconium(IV), (iv) distilling unconverted alkyl (meth)acrylate and azeotroping agent out of the product mixture, (v) distilling off water from the product mixture, wherein step (iv) can also be conducted before step (iii) and steps (iv) and
    Type: Grant
    Filed: February 26, 2016
    Date of Patent: August 6, 2019
    Assignee: BASF SE
    Inventors: Andrea Misske, Friederike Fleischhaker, Christoph Fleckenstein, Martin Kaller, Ritesh Nair, Ulrik Stengel, Mathieu Blanchot
  • Patent number: 10322573
    Abstract: Provided are constituent particles containing a water-soluble material with high flowability in the form of powder, the constituent particles being capable of forming a support member that can be removed with a water-containing solvent in a process for producing a three-dimensional object. The constituent particles used for the production of a three-dimensional object each include a core and a shell that covers at least part of a surface of the core, the core containing a water-soluble material most abundantly, and a material contained in the shell most abundantly having a lower water solubility than the water-soluble material contained in the core.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: June 18, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akira Sugiyama, Yukio Hanyu, Naotake Sato, Masahiko Takahashi, Tomohiro Saito
  • Patent number: 10324392
    Abstract: An electrostatic latent image developing toner includes toner particles each including a toner mother particle and an external additive. The toner mother particle includes a composite core and a shell layer. The composite core is a composite of a toner core, organic particles, and polyhedral magnetic particles. The organic particles each contain a releasing agent and adhere to a surface of the toner core. The magnetic particles include magnetic particles adhering to the surface of the toner core and magnetic particles adhering to surfaces of the organic particles. An amount of the magnetic particles is 0.5 parts by mass to 2.0 parts by mass relative to 100 parts by mass of the toner cores. In a cross-sectional image of each toner particle, an area of protruding portions of the magnetic particles, which protrude from the shell layer, accounts for 10% to 75% of an overall area of the magnetic particles.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: June 18, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hiroki Uemura
  • Patent number: 10303074
    Abstract: A toner comprising a binder resin and a colorant, wherein the toner has a Martens hardness, as measured at a maximum load condition of 2.0×10?4 N, of from 200 MPa to 1,100 MPa.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: May 28, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kentaro Yamawaki, Akane Masumoto, Tomonori Matsunaga, Kunihiko Nakamura, Sara Yoshida, Shinsuke Mochizuki, Tsuneyoshi Tominaga, Kenta Kamikura, Tsutomu Shimano, Toshihiko Katakura, Shiro Kuroki
  • Patent number: 10228627
    Abstract: Provided is a toner containing a toner particle including a binder resin, a wax, and a colorant. The softening point of the toner is at least 80° C. and not more than 140° C. The average circularity of the toner is at least 0.940. The integrated value of stress in the toner at 150° C. which is measured by using a tackiness tester is at least 78 g·m/sec.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: March 12, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuujirou Nagashima, Yusuke Hasegawa, Tomohisa Sano, Yoshitaka Suzumura, Satoshi Arimura, Kozue Uratani
  • Patent number: 10197948
    Abstract: A developing device, including: a developer containing toner and carrier; and developer bearer configured to have surface thereof bear the developer and endlessly move, and to develop latent image over surface of latent image bearer by supplying toner in developer to latent image in developing region facing the latent image bearer, wherein carrier contains fine particles, value X in volume resistivity R (=10X) (?·cm) of carrier is 11.5-16.0, developer bearer includes: magnetic field generating unit including a plurality of magnetic poles; and developing sleeve having a cylindrical shape enclosing magnetic field generating unit, and configured to bear developer over outer circumferential surface of cylindrical shape by magnetic force of the magnetic field generating unit and perform surface moving by rotating relative to developing device body, and developing device includes developing sleeve voltage applying unit configured to apply AC component-containing voltage to developing sleeve.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: February 5, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Hitoshi Iwatsuki, Koichi Sakata, Hiroshi Tohmatsu, Toyoaki Tano, Kenichi Mashiko, Mariko Takii, Hiroyuki Kishida, Yoshihiro Murasawa, Keinosuke Kondoh, Toshio Koike, Yutaka Takahashi
  • Patent number: 10197936
    Abstract: Provided is a toner including toner particles each containing an amorphous polyester resin and a wax, in which: the surface of each of the toner particles has a coating layer; and the coating layer contains one or more kinds of olefin-based copolymers each having a specific ester moiety.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: February 5, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuto Onozaki, Takeshi Hashimoto, Ichiro Kanno, Masayuki Hama, Hitoshi Sano, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa, Hayato Ida
  • Patent number: 10180633
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a toner mother particle and inorganic particles attached to a surface of the toner mother particle. The toner mother particle includes a toner core (11) and a shell layer (12) covering a surface of the toner core (11). The shell layer (12) includes film-shaped first domains (12a) and particle-shaped second domains (12b). The first domains (12a) are substantially formed from a non-cross-linked resin. The second domains (12b) are substantially formed from a cross-linked resin. The cross-linked resin has a glass transition point higher by 40° C. or more than that of the non-cross-linked resin. The first domains (12a) have a surface adsorption force of at least 20.0 nN and no greater than 40.0 nN. The second domains (12b) have a surface adsorption force of at least 4.0 nN and less than 20.0 nN.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: January 15, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu Asakawa
  • Patent number: 10175595
    Abstract: Provided is a toner including a toner particle that contains a toner base particle containing a binder resin and a wax, and a coating layer containing a 1,2-polybutadiene resin at the surface of the toner base particle, wherein the coverage ratio of the toner base particle by the coating layer is at least 50%.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: January 8, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuto Onozaki, Takeshi Hashimoto, Ichiro Kanno, Megumi Ikeda, Masayuki Hama, Nozomu Komatsu, Akifumi Matsubara, Hitoshi Sano, Takakuni Kobori, Hayato Ida, Hiroyuki Fujikawa
  • Patent number: 10151990
    Abstract: A toner comprising a toner particle that contains a binder resin, wherein the surface of the toner particle is covered with a resin A; the modulus of elasticity Ea of the resin A and the modulus of elasticity Eb of the binder resin satisfy the following formula: 0.5?(Ea/Eb)×100?50.0; and the adhesion force AT of the toner particle is at least 500 nN when a probe having spherical SiO2 attached at the tip of a cantilever is pressed into the toner particle at 3 ?N.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: December 11, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masao Suzuki, Kazuyuki Sato, Shohei Fukuya, Atsushi Nakamoto, Makoto Fukatsu, Takahiro Kawamoto, Maki Okajima, Masayoshi Kato, Yasunori Chigono, Takeshi Yamamoto
  • Patent number: 10151992
    Abstract: In accordance with an embodiment, a toner particle comprises two or more glass transition temperatures. Wherein, a first glass transition temperature is within a range from 5 degrees centigrade to 20 degrees centigrade and a second glass transition temperature is within a range from 50 degrees centigrade to 65 degrees centigrade.
    Type: Grant
    Filed: October 5, 2017
    Date of Patent: December 11, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Takashi Urabe, Taishi Takano, Junichi Ishikawa, Maiko Yoshida
  • Patent number: 10132803
    Abstract: A toner composite material includes toner particles that include a sulfonated polyester and a wax and metal nanoparticles disposed on the surface of the toner particles. A method includes providing such toner composite materials, fusing the material to a substrate and covalently linking a ligand to the surface of the silver nanoparticles via a thiol, carboxylate, or amine functional group. Detection strips include a substrate and such toner composite materials fused on the substrate.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: November 20, 2018
    Assignee: XEROX CORPORATION
    Inventors: Valerie M. Farrugia, Wendy Chi, Sandra J. Gardner
  • Patent number: 10082745
    Abstract: An electrostatic latent image developing toner includes toner particles each including a core and a shell layer. The shell layer is a collection of resin particles having the same composition (primary particle diameter of at least 90% by number of the resin particles: 20 nm-30 nm). The shell layer includes a first shell layer, which is a film including the resin particles in a non-aggregated state, and a second shell layer, which is a plurality of particle aggregates (secondary particle diameter of at least 90% by number of the particle aggregates: 100 nm-150 nm). The particle aggregates each include the resin particles in an aggregated state. The surface of the core is entirely covered with the shell layer. The second shell layer is present in a surface of the toner particle in a proportion of at least 5% by area and no greater than 15% by area.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: September 25, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Sho Sumioka
  • Patent number: 10018932
    Abstract: An electrostatic latent image developing toner includes toner particles each including a toner core (11) and a shell layer (12) disposed over a surface of the toner core (11). The toner core (11) contains a polyester resin. The shell layer (12) includes: first resin particles (12a) having a number average primary particle diameter of at least 30 nm and less than 70 nm and a glass transition point of less than 80° C.; and second resin particles (12b) having a number average primary particle diameter of 70-200 nm and a glass transition point of at least 80° C. A percentage of an area of the toner core (11) covered with the first resin particles (12a) relative to a surface area of the toner core (11) is 40-80%. A ratio of total mass of the second resin particles (12b) to total mass of the first resin particles (12a) is 0.5-2.0.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: July 10, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Seishi Ojima
  • Patent number: 10012923
    Abstract: Provided is a toner including toner particles, each of which contains a binder resin, a colorant, a releasing agent and a crystalline polyester, wherein in an observation of a cross-section each of the toner particles by transmission electron microscopy, specific toner particles each of which has domains of the crystalline polyester and domains of the releasing agent, are present at a ratio of at least 70% by number of the toner particles in the toner, an arithmetic mean of maximum diameters of the domains of the releasing agent is within prescribed range, and the specific toner particles satisfy prescribed conditions.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: July 3, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tomohisa Sano, Yusuke Hasegawa, Yoshitaka Suzumura, Satoshi Arimura, Takuma Ikejiri
  • Patent number: 10007203
    Abstract: A complex particle including a core particle and a shell particle, wherein the shell particle is disposed on the core particle, wherein the core particle includes an organic material or an inorganic material as a primary component and the shell particle includes the other of the organic material and the inorganic material as a primary component, wherein an average particle diameter of the core particle is greater than or equal to about 80 nanometers and less than or equal to about 300 nanometers, a coefficient of variation of an average particle diameter of the core particle is greater than or equal to about 2% and less than or equal to about 10%, an average particle diameter of the shell particle is greater than or equal to about 5 nanometers and less than or equal to about 30 nm, a ratio of the average particle diameter of the shell particle relative to the average particle diameter of the core particle is greater than or equal to about 0.016 and less than or equal to about 0.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: June 26, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hiroshi Miyao, Hiromichi Jin
  • Patent number: 10007204
    Abstract: An electrostatic latent image developing toner includes toner particles each including a core and a shell layer disposed over a surface of the core. The shell layer contains first resin particles having a number average particle diameter of 60 nm to 100 nm and second resin particles having a number average particle diameter of 10 nm to 50 nm. A particle diameter difference obtained by subtracting the number average particle diameter of the second resin particles from the number average particle diameter of the first resin particles is +20 nm to +50 nm. The first resin particles contain a charge control agent. The first resin particles have a higher softening point than the second resin particles. A ratio of a mass of the first resin particles to a sum of the mass of the first resin particles and a mass of the second resin particles is 0.7 to 0.9.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: June 26, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Sho Sumioka
  • Patent number: 10007202
    Abstract: A positively chargeable toner includes a plurality of toner particles each including a core and a shell layer disposed over a surface of the core. The core contains a polyester resin. The shell layer covers at least 40% and no greater than 80% of an area of the surface of the core, ?(4) is greater than 0 V. ?(6) is less than 0 V. A relationship represented by |?(3)??(4)|>|?(6)??(7)| is satisfied. ?(3), ?(4), ?(6), and ?(7) represent zeta potentials of the positively chargeable toner with the toner particles having no external additive. ?(3), ?(4), ?(6), and ?(7) are respectively measured in an aqueous medium at pH 3, pH 4, pH 6, and pH 7.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: June 26, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Seishi Ojima
  • Patent number: 9983491
    Abstract: A process for producing a toner of the present invention includes: a first step of heating a dispersion containing an aqueous medium and a binder resin containing a crystalline resin to a temperature higher than or equal to a melting point of the crystalline resin; and a second step of maintaining the dispersion at temperature T (° C.) for 30 minutes or longer in a state where a pH of the dispersion is maintained at 5.5 or higher and 9.0 or lower, in which the temperature T satisfies the following expression, Rc?25?T?Rc?5, where the Rc represents a recrystallization temperature (° C.) of the crystalline resin.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: May 29, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Junya Onishi, Shiro Hirano, Noboru Ueda, Kouji Sugama, Aya Shirai
  • Patent number: 9977355
    Abstract: A plurality of toner particles each include a toner core, a shell layer covering a surface of the toner core, and a plurality of magnetic particles penetrating the shell layer. Each of the magnetic particles has an embedded portion and a protrusion portion. The embedded portions are embedded in the surface of the toner core. The protrusion portions are located further outward than the embedded portions in a radial direction of the toner particle and protrude outward from a surface of the shell layer in the radial direction of the toner particle. An average Heywood diameter X of the magnetic particles, a shell layer thickness Y, and an average value Z of protrusion heights of the respective magnetic particles satisfy relation (1) and relation (2) shown below.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: May 22, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Toshiki Takemori
  • Patent number: 9971266
    Abstract: A method of producing a toner for developing electrostatic images includes Steps I to III is provided. The toner includes a toner matrix particle having a core-shell structure. The toner matrix particle includes a core particle including an amorphous resin A and a crystalline material, and a shell including an amorphous resin B. The shell includes a phase of the amorphous resin B that is not fused with the core particle at the interface. The amorphous resin A differs from the amorphous resin B.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: May 15, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Naoya Tonegawa, Takanari Kayamori, Masaharu Matsubara, Kouji Sekiguchi, Atsushi Iioka
  • Patent number: 9964886
    Abstract: Provided is an electrostatic latent image developing toner that, while ensuring low temperature fixability, can ensure image quality stability even during high-speed continuous printing. The toner is an electrostatic latent image developing core-shell type toner containing at least a binder resin. The binder resin includes a crystalline polyester resin, an amorphous polyester resin, and a hybrid amorphous vinyl resin in which a vinyl polymerization segment is chemically bonded to a polymerization segment other than the vinyl polymerization segment, in which a core portion of the toner contains the crystalline polyester resin and the amorphous polyester resin, whereas a shell portion of the toner contains the hybrid amorphous vinyl resin, and the hybrid amorphous vinyl resin has a vinyl polymerization segment content of from 51 to 99% by mass.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: May 8, 2018
    Assignee: KONICA MINOLTA, INC.
    Inventors: Kaori Matsushima, Tomomi Oshiba
  • Patent number: 9915887
    Abstract: The object of the present invention is to provide a toner for development of electrostatic images (hereinafter referred to as toner) which, while preventing dust during fixation, secures improved hot offset resistance and is excellent in providing good image quality. The invention relates to the toner that comprises a binder resin, a colorant and a wax, wherein the wax has, while in a state of being contained in the toner, a melting point of from 55° C. to 90° C., and the value Dt of the toner satisfies a specific formula.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: March 13, 2018
    Assignee: MITSUBISHI CHEMICAL CORPORATION
    Inventors: Masaya Ota, Shiho Sano
  • Patent number: 9891544
    Abstract: Disclosed herein include toner compositions with toner particles having a core-shell type structure, where the core comprises a first resin comprising a styrene-acrylate copolymer and an amorphous polyester resin, and the shell comprises a second resin comprising beta-carboxyethyl acrylate (b-CEA) in an amount of from about 0.05 pph to about 2.5 pph by weight of the second resin.
    Type: Grant
    Filed: July 8, 2015
    Date of Patent: February 13, 2018
    Assignee: XEROX CORPORATION
    Inventors: Richard P N Veregin, Valerie M. Farrugia, Sandra J. Gardner
  • Patent number: 9864290
    Abstract: Disclosed is a toner including toner particles each including a core portion that contains a binder resin, and a surface layer containing an organosilicon polymer, in which each of the toner particles contains a polyvalent metal element having a resistivity of 2.5×10?8 ?·m or more and 10.0×10?8 ?·m or less at 20° C., and when the toner particles are subjected to X-ray fluorescence analysis, a net intensity originating from the polyvalent metal element is 0.10 kcps or more and 30.00 kcps or less.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: January 9, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kentaro Yamawaki, Shiro Kuroki, Toshihiko Katakura, Akane Masumoto, Tsuneyoshi Tominaga
  • Patent number: 9864289
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a core containing a binder resin and a shell layer covering a surface of the core. The shell layer contains a copolymer of at least two vinyl compounds including a compound represented by the following formula (1). The toner contains a ring unopened oxazoline group in an amount of at least 0.10 ?mol/g and no greater than 100 ?mol/g.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: January 9, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Haruhiro Nishitera, Tomoyasu Asakawa
  • Patent number: 9857712
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a core and a shell layer. The shell layer is disposed over a surface of the core. The shell layer is substantially formed by a resin. The shell layer has a surface including a plurality of spot regions and a sheet region that is more hydrophobic than the spot regions. The spot regions each are more chargeable than the sheet region.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: January 2, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masami Tsujihiro, Jun Hioki, Ryotaro Komada, Yusuke Washino, Haruhiro Nishitera
  • Patent number: 9798262
    Abstract: Provided is a method of producing a toner including the steps of: mixing a resin solution comprising a resin R, a colorant, and an organic solvent, a resin fine particle comprising a resin S containing an element ?, and carbon dioxide to form a droplet having a surface covered with the resin fine particle; introducing carbon dioxide in a liquid state and pressurizing to extract the organic solvent in the droplet; and removing the extracted organic solvent together with the carbon dioxide to provide a toner particle. In the method of producing a toner, when the resin fine particle is treated with the carbon dioxide in a liquid state, a change in amount of the element ? on the surface of the resin fine particle after the treatment as compared to the amount before the treatment falls within a specific range.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: October 24, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Noritaka Toyoizumi, Yusuke Kosaki, Tetsuya Kinumatsu, Kenji Aoki, Shuntaro Watanabe, Takaaki Kaya, Atsushi Tani, Kazumichi Nakahama, Shinnosuke Koji, Takashige Kasuya
  • Patent number: 9785071
    Abstract: The toner comprising a toner particle having a core-shell structure that contains a core containing an amorphous resin A and a crystalline resin and a shell containing an amorphous resin B, wherein the amorphous resin A contains a styrene-acrylic resin, the content of the styrene-acrylic resin is at least 50% by mass based on the total mass of the amorphous resin A, a degree of compatibility A between the amorphous resin A and the crystalline resin is at least 50% and not more than 100%, and a degree of compatibility B between the amorphous resin B and the crystalline resin is at least 0% and not more than 40%.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: October 10, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tsutomu Shimano, Yoshihiro Nakagawa, Masatake Tanaka, Naoya Isono, Yu Yoshida
  • Patent number: 9785076
    Abstract: A toner set for electrostatic image development includes a cyan toner, a magenta toner, and a yellow toner, wherein the Vicat softening temperatures of the toners are respectively in the range of from about 30° C. to about 60° C., and among the toners, the difference between the Vicat softening temperature of the toner having the highest Vicat softening temperature and the Vicat softening temperature of the toner having the lowest Vicat softening temperature is from about 1° C. to about 5° C.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: October 10, 2017
    Assignee: FUJI XEROX CO., LTD.
    Inventor: Hiroko Kobayashi
  • Patent number: 9760033
    Abstract: Provided is a toner for developing electrostatic images containing toner particles. The toner particles contain a crystalline resin and an amorphous resin. The amorphous resin contains an amorphous vinyl resin component containing a polymer of monomers having a structure represented by formula (1). The content of a structural unit derived from the monomers in the toner particles is within a range of 2.4 to 13.5 mass %. H2C?CR1—COOR2??(1) In formula (1), R1 represents a hydrogen atom or a methyl group and R2 represents a branched alkyl group having a carbon number of 8 or more.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: September 12, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Junya Onishi, Shiro Hirano, Aya Shirai
  • Patent number: 9709912
    Abstract: A toner is provided. The toner includes a crystalline resin and a non-crystalline resin, and has a thermal property such that when the toner is heated after being firstly heated to 60° C. followed by cooling in differential scanning calorimetry (DSC), the toner has a clear peak specific to melting of the crystalline resin at a temperature T1, and when the toner is heated after being firstly heated to 80° C. followed by cooling in the differential scanning calorimetry (DSC), the toner does not have a clear peak specific to melting of the crystalline resin at a temperature not higher than the temperature T1.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: July 18, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuoki Fuwa, Takuya Kadota, Yoshihiro Mikuriya, Tsuyoshi Nozaki, Yoshimichi Ishikawa, Yuta Takeuchi, Tomohiro Fukao, Tomoharu Miki, Takayuki Nakamura
  • Patent number: 9703217
    Abstract: MICR toner compositions for use in offset lithography (or offset printing). Such MICR toner compositions exhibit desirable magnetic properties.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: July 11, 2017
    Assignee: XEROX CORPORATION
    Inventor: Juan A. Morales-Tirado
  • Patent number: 9696647
    Abstract: An electrostatic latent image developing toner contains toner particles each containing a toner core, and a shell layer dividedly disposed as a plurality of segments on a surface of the toner core. The shell layer contains a hydrophobic thermoplastic resin and a hydrophilic thermosetting resin. A toner core-shell layer interface formation rate is 3.78×106 m?1 or more and 7.02×106 m?1 or less. A ratio of the hydrophobic thermoplastic resin to the toner core is 0.40% by mass or more and 1.55% by mass or less.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: July 4, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hideharu Hori
  • Patent number: 9678450
    Abstract: Provided is [i] a toner including at least a colorant, a resin, and a releasing agent, wherein a spin-spin relaxation time (t2) of the toner at 90° C. obtained by Hahn Echo method of pulse NMR analysis is from 1.80 msec to 7.00 msec. Also provided is [ii] a toner according to [i], wherein the spin-spin relaxation time (t2) of the toner at 90° C. obtained by Hahn Echo method of pulse NMR analysis is from 3.80 msec to 5.90 msec.
    Type: Grant
    Filed: April 25, 2014
    Date of Patent: June 13, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Mio Kumai, Hideki Sugiura, Yuka Mizoguchi
  • Patent number: 9651885
    Abstract: An electrostatic latent image developing toner includes toner particles that each include a toner core and a shell layer disposed over a surface of the toner core. The shell layer contains a hydrophobic thermoplastic resin and a hydrophilic thermosetting resin. The hydrophobic thermoplastic resin is contained in an amount of no less than 0.2% by mass and no greater than 4.7% by mass relative to mass of the toner particles. The hydrophilic thermosetting resin is contained in an amount of no less than 0.01% by mass and no greater than 0.71% by mass relative to mass of the toner particles. The hydrophobic thermoplastic resin is exposed at a surface of each of the toner particles.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: May 16, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Ryota Kobayashi, Masami Tsujihiro, Jun Hioki, Yusuke Washino
  • Patent number: 9639018
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a toner core and a shell layer. The shell layer includes a plurality of first shell particles and a plurality of second shell particles. The first shell particles cover the toner core at a coverage of at least 25% and no greater than 50%. The second shell particles additionally cover the toner cores at a coverage of at least 5% and no greater than 30%. An SP value of the toner core is greater than an SP value of the first shell particles. The SP value of the first shell particles is greater than an SP value of the second shell particles.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: May 2, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hidetoshi Miyamoto