Patents Assigned to Tokai Carbon Co., Ltd.
  • Publication number: 20130217826
    Abstract: A polyurethane resin-bonded pigment may exhibit excellent image density, dispersibility, storage stability, and resolubility, and may form an ink film that exhibits marker resistance and rubfastness. The polyurethane resin-bonded pigment is produced by bringing (I) a pigment having a surface acidic group into contact with (II) a basic compound having two or more amino groups selected from a primary amino group and a secondary amino group in its molecule in an aqueous medium to obtain a pigment having an unreacted surface amino group, and bringing the pigment having an unreacted surface amino group into contact with (III) a water-dispersible polyurethane resin having an isocyanate end group and (IV) a polyisocyanate compound to bond the pigment having an unreacted surface amino group and the water-dispersible polyurethane resin (III) having an isocyanate end group via a urea bond.
    Type: Application
    Filed: July 1, 2011
    Publication date: August 22, 2013
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Shigehiro Tanaka, Asami Takenaka, Yukari Ishibashi
  • Patent number: 8497317
    Abstract: A method of producing a polyurethane resin-bonded pigment aqueous dispersion includes causing (I) a pigment having a surface acidic group to come in contact with (II) a basic compound having two or more amino groups selected from a primary amino group and a secondary amino group in its molecule in an aqueous medium so that the pigment has an unreacted surface amino group, and causing the pigment to come in contact and react with (III) a polyurethane resin having an isocyanate end group. A polyurethane resin-bonded pigment aqueous dispersion produced by the method exhibits excellent image density, dispersibility, and storage stability.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: July 30, 2013
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Makoto Sekiyama, Shigehiro Tanaka
  • Publication number: 20130165584
    Abstract: A pigment that exhibits excellent image density, dispersibility, storage stability, and resolubility, and forms an ink film that exhibits marker resistance and rubfastness is provided. A polyurethane resin-bonded pigment is produced by bringing (I) a pigment having a surface acidic group into contact with (II) a water-dispersible polyurethane resin having a tertiary amino group and an anionic polar group or a nonionic polar chain in an aqueous medium. The pigment (I) is preferably self-dispersible carbon black having a surface acidic group.
    Type: Application
    Filed: May 30, 2011
    Publication date: June 27, 2013
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Yukari Ishibashi, Asami Takenaka, Shigehiro Tanaka
  • Patent number: 8404383
    Abstract: A negative electrode material for a nonaqueous secondary battery capable of realizing a nonaqueous secondary battery having a small charging/discharging irreversible capacity at an initial cycle and exhibiting an excellent high-rate charging/discharging characteristics and an excellent cycle performances is provided. The main component of the material is graphite particles. The median diameter is 5 ?m or more, and 40 ?m or less in the volume-basis particle size distribution based on the laser diffraction/scattering particle size distribution measurement. The tapping density is 0.7 g/cm3 or more. The specific surface area measured by a BET method is 0.2 m2/g or more, and 8 m2/g or less. The average circularity is 0.83 or more, and 1.00 or less. When an electrode is produced by a predetermined method for manufacturing an electrode and, the resulting electrode is subjected to X-ray diffraction, the graphite crystal orientation ratio I110/I004 on the electrode is 0.
    Type: Grant
    Filed: August 30, 2005
    Date of Patent: March 26, 2013
    Assignees: Mitsubishi Chemical Corporation, Tokai Carbon Co., Ltd.
    Inventors: Nobuyuki Onishi, Hideharu Satoh, Keita Yamaguchi
  • Publication number: 20130030108
    Abstract: Carbon black includes primary particles having an average particle size of 15 to 40 nm, microprotrusions having an average length of 2 to 10 nm being formed on a surface of the primary particles. A method for producing carbon black includes introducing an oxygen-containing gas and fuel into a fuel combustion zone, mixing and combusting the oxygen-containing gas and the fuel to produce a high-temperature combusted gas stream, introducing a raw material hydrocarbon in a first stage of a raw material introduction zone and introducing the raw material hydrocarbon and an oxygen-containing gas in a second stage of the raw material introduction zone while introducing the high-temperature combusted gas stream into the raw material introduction zone to produce a carbon black-containing gas which is introduced into a reaction termination zone while spraying a coolant.
    Type: Application
    Filed: February 1, 2011
    Publication date: January 31, 2013
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Ryusuke Harada, Takeshi Akahane
  • Publication number: 20120190789
    Abstract: A method of producing a polyurethane resin-bonded pigment aqueous dispersion includes causing (I) a pigment having a surface acidic group to come in contact with (II) a basic compound having two or more amino groups selected from a primary amino group and a secondary amino group in its molecule in an aqueous medium so that the pigment has an unreacted surface amino group, and causing the pigment to come in contact and react with (III) a polyurethane resin having an isocyanate end group. A polyurethane resin-bonded pigment aqueous dispersion produced by the method exhibits excellent image density, dispersibility, and storage stability.
    Type: Application
    Filed: September 1, 2010
    Publication date: July 26, 2012
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Makoto Sekiyama, Shigehiro Tanaka
  • Publication number: 20120187422
    Abstract: A semiconductor substrate that includes a semiconductor layer that exhibits high crystallinity includes a graphite layer formed of a heterocyclic polymer obtained by condensing an aromatic tetracarboxylic acid and an aromatic tetramine, and a semiconductor layer that is grown on the surface of the graphite layer, or includes a substrate that includes a graphite layer formed of a heterocyclic polymer obtained by condensing an aromatic tetracarboxylic acid and an aromatic tetramine on its surface, a buffer layer that is grown on the surface of the graphite layer, and a semiconductor layer that is grown on the surface of the buffer layer.
    Type: Application
    Filed: September 7, 2010
    Publication date: July 26, 2012
    Applicants: TOKAI CARBON CO., LTD., THE UNIVERSITY OF TOKYO
    Inventors: Hiroshi Fujioka, Tetsuro Hirasaki, Hitoshi Ue, Junya Yamashita, Hiroaki Hatori
  • Publication number: 20120171104
    Abstract: A method of producing a surface-treated carbon black powder dispersion includes subjecting carbon black fine particles having a volume average particle size of 100 nm to 20 ?m to wet granulation and drying by heating to obtain granulated carbon black having a hardness of 12 cN or less and a pH of less than 7, grinding the granulated carbon black to obtain a ground product having a volume average particle size of 20 nm to 20 ?m, and subjecting the ground product to wet oxidization in an aqueous medium. The resulting surface-treated carbon black powder dispersion exhibits excellent print density, print quality, discharge stability, and storage stability when used as an inkjet printer aqueous black ink.
    Type: Application
    Filed: July 9, 2010
    Publication date: July 5, 2012
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Hironori Arai, Masanobu Maeda
  • Publication number: 20120161352
    Abstract: A method of producing a fuel cell separator includes pressing a compact part-forming material that includes a carbonaceous powder and a thermosetting resin binder at a temperature equal to or higher than the softening temperature of the thermosetting resin binder and less than the curing temperature of the thermosetting resin binder to obtain a compact part-forming preformed sheet, preparing a porous part-forming powder that includes a carbonaceous powder and a thermosetting resin binder, placing the compact part-forming preformed sheet and the porous part-forming powder in a forming die that has a concave-convex forming surface corresponding to the shape of a gas passage so that the concave-convex forming surface faces the porous part-forming powder, and hot-pressing the compact part-forming preformed sheet and the porous part-forming powder using the forming die at a temperature equal to or higher than the curing temperature of the thermosetting resin binder included in the compact part-forming material or
    Type: Application
    Filed: May 27, 2010
    Publication date: June 28, 2012
    Applicant: TOKAI CARBON CO., LTD.
    Inventor: Kazuhiro Yamamoto
  • Patent number: 8153303
    Abstract: A negative electrode material for lithium ion secondary batteries includes core-shell composite particles prepared by covering the surface of a graphite powder with an amorphous carbon powder via a carbide of binder pitch, the graphite powder having an average particle diameter of 5 to 30 ?m and an average lattice spacing d(002) of less than 0.3360 nm, and the amorphous carbon powder having an average particle diameter of 0.05 to 2 ?m and an average lattice spacing d(002) of 0.3360 nm or more. A method to produce the negative electrode material includes mixing a graphite powder with pitch having a softening point of 70 to 250° C., adding an amorphous carbon powder to the resulting product, kneading the mixture while applying a mechanical impact to soften the pitch and carbonizing the pitch by heat treatment of the mixture at 750 to 2250° C. in a non-oxidizing atmosphere.
    Type: Grant
    Filed: November 8, 2007
    Date of Patent: April 10, 2012
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Kenta Ishii
  • Patent number: 8026319
    Abstract: Dispersible surface-modified carbon black that is surface-modified by causing a functional group on the surface of the carbon black to be bonded to a diol-modified end-containing polymer through a triisocyanate compound exhibits excellent dispersibility in a non-polar solvent, a low-polar solvent, and a resin. The dispersible surface-modified carbon black is characterized in that a surface functional group of the carbon black is bonded to one isocyanate end group of a triisocyanate compound having three isocyanate end groups, and the remaining two isocyanate end groups are respectively bonded to hydroxyl groups of a diol-modified end-containing polymer.
    Type: Grant
    Filed: May 29, 2007
    Date of Patent: September 27, 2011
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Tomoaki Kirino, Makoto Sekiyama
  • Patent number: 7951241
    Abstract: A carbon black aqueous dispersion exhibits excellent dispersibility in an aqueous medium and exhibits excellent rubbing resistance (quick-drying properties), discharge stability, and the like as an aqueous black ink for an inkjet printer or the like. The carbon black aqueous dispersion includes an aqueous medium and carbon black dispersed in the aqueous medium, acidic groups produced on the surface of the carbon black by liquid-phase oxidation being neutralized with a basic amino acid and a basic compound other than the basic amino acid, and hydrogen atoms of the acidic groups being replaced by the basic amino acid and the basic compound.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: May 31, 2011
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Toshiya Horii
  • Patent number: 7922801
    Abstract: A carbon black aqueous dispersion which has excellent dispersibility in an aqueous medium and is suitable as an aqueous black ink, such as an inkjet printer ink and a method of producing the same. The carbon black aqueous dispersion includes an aqueous medium and a carbon black pigment dispersed in the aqueous medium, wherein some or all of the hydrogen atoms of the acidic groups produced by liquid-phase oxidation of the carbon black are replaced with a basic amino acid salt group by neutralization with a basic amino acid. The method of producing a carbon black aqueous dispersion includes subjecting carbon black to liquid-phase oxidation, removing reduced salts from the resulting slurry, neutralizing the slurry with a basic amino acid to replace some or all of the hydrogen atoms of the acidic groups with a basic amino acid salt group to form a basic amino acid salt compound, and purifying the resulting product.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: April 12, 2011
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Shigemi Toda, Makoto Sekiyama
  • Patent number: 7897283
    Abstract: To provide a nonaqueous secondary battery ensuring that a charge-discharge irreversible capacity at an initial cycle is sufficiently small even when an active material layer comprising a negative electrode active material on a current collector is increased in a density for obtaining a high capacity. This object is attained by a graphite composite particle for a nonaqueous secondary battery, which satisfies the requirements (1) and (2): (1) DL/DS is more than 1 and 2 or less, wherein DL ?m means a volume-based median size measured by a laser diffraction/scattering-type particle size distribution measuring apparatus, and DS ?m means an average circle-equivalent particle size which is determined from a measured area S of particles each having a contour not overlapped with a contour of another particle in a SEM; and (2) a Raman R value is 0.04 or more and 0.
    Type: Grant
    Filed: June 26, 2006
    Date of Patent: March 1, 2011
    Assignees: Mitsubishi Chemical Corporation, Tokai Carbon Co., Ltd.
    Inventors: Hitoshi Matsumoto, Hideharu Satoh
  • Patent number: 7855249
    Abstract: A surface-modified carbon black pigment suitable as electronic paper black particles, a silicone oil dispersion of the carbon black pigment, and a process for producing the carbon black pigment are disclosed. The carbon black pigment includes surface-modified carbon black, a diphenylmethane group that is bonded to the carbon black via a urethane bond through a functional group on the surface of the carbon black being bonded to a polysiloxane group. The carbon black dispersion includes a silicone oil and the carbon black pigment, the carbon black pigment being dispersed in the silicone oil at a concentration of 1 to 20 wt %.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: December 21, 2010
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Tomoaki Kirino
  • Publication number: 20100269732
    Abstract: A carbon black aqueous dispersion that is suitable as an aqueous black ink for inkjet printers, and a method of producing the same are disclosed. A surface-treated carbon black aqueous dispersion includes an aqueous medium and surface-treated carbon black that is dispersed in the aqueous medium, the surface-treated carbon black having been chemically modified by causing a hydrophilic surface functional group of the carbon black and an amino group-containing compound to undergo a dehydration-condensation reaction in the presence of a triazine condensing agent to form an amide bond.
    Type: Application
    Filed: December 25, 2008
    Publication date: October 28, 2010
    Applicant: TOKAI CARBON CO., LTD.
    Inventor: Makoto Sekiyama
  • Patent number: 7754177
    Abstract: A hollow carbon nanoballoon structure having a relatively large closed space, and a method of producing a carbon nanoballoon structure capable of easily and stably producing such a structure. The carbon nanoballoon structure is obtained by heating soot prepared by an arc discharge using carbon electrodes, soot prepared by vaporizing carbon by laser irradiation, or carbon black having a specific surface area of 1000 m2/g or more and a primary particle diameter of 20 nm or more at a high temperature in an inert gas atmosphere, and includes graphite sheets linked to form a curved surface.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: July 13, 2010
    Assignees: Tokai Carbon Co., Ltd., Futaba Corporation
    Inventors: Hirofumi Takikawa, Akira Kondo, Kazuo Yoshikawa, Shigeo Itoh
  • Patent number: 7740990
    Abstract: A separator material suitable for a polymer electrolyte fuel cell and a method of producing the same. The separator material exhibiting gas impermeability, strength, dimensional stability during long-term use, and only a small degree of dissolution of organic substances which hinder the cell reaction. The separator material includes a graphite/cured resin molded product produced by binding a graphite powder using a mixed resin prepared by mixing an epoxy resin with a specific epoxy equivalent and a phenolic resin with a specific hydroxyl equivalent at a specific equivalent ratio and adding an imidazole compound without an amino group as a curing accelerator. The graphite/cured resin molded product has, when immersed in hot water at 90° C., a water absorption elongation percentage after 500 hours of immersion of a specific value or less and an amount of ammonium ions dissolved and an amount of TOC dissolved after 50 hours of immersion of specific values or less.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: June 22, 2010
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Tomonori Tahara, Nobuyuki Hirano
  • Patent number: 7682436
    Abstract: A carbon black aqueous dispersion which exhibits excellent dispersibility in an aqueous medium, a small amount of feathering, excellent rubbing resistance (quick-drying properties), excellent discharge stability, and the like, and is suitable as an ink for inkjet printers and the like, and a method of producing the same are disclosed.
    Type: Grant
    Filed: October 11, 2006
    Date of Patent: March 23, 2010
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Hidenao Nakata, Toshiya Horii
  • Publication number: 20090214954
    Abstract: A negative electrode material for a nonaqueous secondary battery capable of realizing a nonaqueous secondary battery having a small charging/discharging irreversible capacity at an initial cycle, exhibiting an excellent high-rate charging/discharging characteristics and an excellent cycle performances, and having no electrodeposition problem is provided. The main component of the material is graphite particles. The median diameter of the graphite particles is 5 ?m or more, and 40 ?m or less in the volume-basis particle size distribution based on the laser diffraction/scattering particle size distribution measurement. The tapping density of the negative electrode material is 0.7 g/cm3 or more. The specific surface area measured by a BET method is 0.2 m2/g or more, and 8 m2/g or less.
    Type: Application
    Filed: August 30, 2005
    Publication date: August 27, 2009
    Applicants: MITSUBISHI CHEMICAL CORPORATION, TOKAI CARBON CO., LTD
    Inventors: Nobuyuki Onishi, Hideharu Satoh, Keita Yamaguchi