Patents Assigned to Tokai Carbon Co., Ltd.
  • Publication number: 20090130561
    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: Application
    Filed: June 26, 2006
    Publication date: May 21, 2009
    Applicants: MITSUBISHI CHEMICAL CORPORATION, TOKAI CARBON CO., LTD.
    Inventors: Hitoshi Matsumoto, Hideharu Satoh
  • Publication number: 20090114119
    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: Application
    Filed: June 27, 2006
    Publication date: May 7, 2009
    Applicant: TOKAI CARBON CO., LTD.
    Inventor: Toshiya Horii
  • Publication number: 20080199777
    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: Application
    Filed: August 30, 2005
    Publication date: August 21, 2008
    Applicants: MITSUBISHI CHEMICAL CORPORATION, TOKAI CARBON CO., LTD.
    Inventors: Nobuyuki Onishi, Hideharu Satoh, Keita Yamaguchi
  • Publication number: 20080168922
    Abstract: A carbon black aqueous dispersion which has excellent dispersibility and ink performance and is suitable as an aqueous black ink for an inkjet printer or the like, and a method of producing the same. The carbon black aqueous dispersion is obtained by spraying a slurry including carbon black, a surface chemical modifier, and an aqueous medium under pressure from a nozzle to cause collision between sprayed streams or between sprayed streams and a wall surface. The carbon black agglomerates have a maximum particle diameter of 1 ?m or less.
    Type: Application
    Filed: November 4, 2005
    Publication date: July 17, 2008
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Hidenao Nakata, Hironori Arai
  • Publication number: 20070228339
    Abstract: The present invention provides a low electric conductivity, high heat radiation polymeric composition which includes a polymeric material and a carbon-based filler compounded with the polymeric material, wherein the carbon-based filler has an electron withdrawing agent grafted onto a surface of the carbon-based filler.
    Type: Application
    Filed: March 29, 2007
    Publication date: October 4, 2007
    Applicants: TOYODA GOSEI CO., LTD., TOKAI CARBON CO., LTD.
    Inventors: Hideyuki Fujiwara, Yoshiki Nakamura, Satoshi Komiyama
  • Patent number: 7022176
    Abstract: The present invention provides a carbon black for coloring cement excelling in dispersibility in cement slurry, exhibiting superior adhesion to a cement matrix, and excelling in coloring characteristics and strength, and a method for coloring a cement-formed product using the carbon black. The carbon black for coloring cement is a carbon black in which humic acids are adsorbed on the surface by a surface treatment using an aqueous solution in which the humic acids are dissolved. The carbon black is preferably a carbon black on which humic acids are adsorbed by wet-granulation and drying using an aqueous solution in which the humic acids are dissolved as granulation water. The coloring method includes adding and mixing a water suspension in which carbon black, on which the humic acids are adsorbed, is dispersed in water with cement slurry, or directly adding and mixing carbon black on which the humic acids are adsorbed with the cement slurry, thereby coloring a cement-formed product.
    Type: Grant
    Filed: December 22, 1999
    Date of Patent: April 4, 2006
    Assignees: Tokai Carbon Co., Ltd., Telnite Co., Ltd., Tokyo Zairyo Co., Ltd., Toteku Co., Ltd.
    Inventors: Daisuke Inoue, Hidetake Sakurai, Masato Wake, Toshiji Ikeshima
  • Patent number: 6989083
    Abstract: A graphite cathode and a graphite anode are placed opposite each other through an insulating plate having a notch. A voltage is applied between both of the electrodes to generate arc discharge at the notch of the insulating plate. A given area of the graphite anode is evaporated from an electrode point of the arc discharge, and simultaneously an arc jet is generated from the notch. Thereby, a carbon nanoparticle comprising soot of carbon nanomaterial containing carbon nanohorn is generated. The soot is deposited on a recovering plate for recovery.
    Type: Grant
    Filed: April 4, 2003
    Date of Patent: January 24, 2006
    Assignees: Futaba Corporation, Tokai Carbon Co., Ltd.
    Inventors: Hirofumi Takikawa, Mitsukuni Ikeda, Shigeo Itoh, Tomonori Tahara
  • Patent number: 5961361
    Abstract: A method manufactures an electrode plate for a plasma processing device in which a semiconductor wafer is processed to form a highly integrated circuit. The method includes a curing step of heat-curing a liquid thermosetting resin to prepare a resin forming material one or two backing steps of carbonizing the heat-cured resin forming material by heating under a non-oxidizing atmosphere to prepare a baking material composed of glass-like carbon and a polishing step of polishing one face of the baking material, which is exposed to plasma, to a depth of 20 .mu.m to 1.25 mm.
    Type: Grant
    Filed: September 22, 1997
    Date of Patent: October 5, 1999
    Assignees: Tokyo Electron Limited, Tokai Carbon Co., Ltd
    Inventors: Shosuke Endoh, Masaaki Mitsuno
  • Patent number: 5354528
    Abstract: A process for producing a preform having a buffer layer for use in compositing a metal matrix composite where the buffer layer is provided at a boundary between a composited portion and a non-composited portion of a metallic material in the metal matrix composite. The process includes subjecting a first dispersion including a liquid medium and a ceramic whisker homogeneously dispersed in the liquid medium to filtration under pressure to form a primary processed preform having a volume fraction of 12 to 30%, depositing on the primary processed preform a second dispersion including a liquid medium and, homogeneously dispersed therein, a binder and at least one member selected from the group consisting of a short fiber and a ceramic whisker, and drying the primary processed preform to form a buffer layer having a volume fraction lower than the volume fraction of the primary processed preform and in a range from 2 to 10%.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: October 11, 1994
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Masaru Akiyama, Kenji Maniwa
  • Patent number: 5320820
    Abstract: There is disclosed carbon black for a tire tread rubber which has a nitrogen adsorption specific surface area (N.sub.2 SA) of 60 to 160 m.sup.2 /g and a dibutyl phthalate absorption (DBP) of 90 to 150 ml/100 g which belong to the respective regions of hard grades of carbon black, and an intraaggregate void volume Vp (ml/g) which is at most equal to the value calculated according to the formula.
    Type: Grant
    Filed: May 19, 1993
    Date of Patent: June 14, 1994
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Yasuharu Yoshii, Shinji Misono, Hitoshi Ue
  • Patent number: 5321072
    Abstract: A rubber composition comprising: 100 parts by weight of a rubber component and 35 to 100 parts by weight of a furnace carbon black having a nitrogen adsorption specific surface area (N.sub.2 SA) of from 60 to 100 m.sup.2 /g, a dibutyl phthalate absorption (DBP) of from 90 to 150 ml/100 g, a .DELTA.DBP (DBP24M4DBP) of from 15 to 40 ml/100 g, an aggregate size distribution (.DELTA.Dst) of from 50 to 150 nm, and an intraaggregate pore mode diameter (D.sub.P) which satisfies the following formula:D.sub.P .ltoreq.1.543Dst-55.0wherein D.sub.P represents the mode diameter of the maximum frequency in a carbon black intraaggregate pore diameter distribution determined using a differential scanning calorimeter (DSC) and Dst represents the mode Stokes diameter of carbon black aggregates determined using a disk centrifuge (DCF).
    Type: Grant
    Filed: April 6, 1993
    Date of Patent: June 14, 1994
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Shinji Misono
  • Patent number: 5265118
    Abstract: A silicon carbide whisker production apparatus manufactured by placing a plurality of lidded reaction vessels in the longitudinal direction of an Acheson furnace at intervals, packing graphite grains in the gaps between the adjacent reaction vessels and around the reaction vessels along the longitudinal direction of the furnace starting with the furnace-side ends of terminal electrodes to form a surrounding heating zone, and packing a heat insulating packing around the surrounding heating zone.
    Type: Grant
    Filed: March 18, 1992
    Date of Patent: November 23, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Takashi Takenaka, Shigeto Mori, Osamu Machida
  • Patent number: 5256243
    Abstract: A process for producing a titanium carbide whisker, comprising the steps of: mixing 100 parts by weight of a titanium source comprising titanium dioxide and/or an alkali metal titanate with 50 to 200 parts by weight of a carbon source and 1 to 30 parts by weight of a transition metal chloride; and heating the resultant mixture at 1300.degree. to 1700.degree. C. in an inert gas atmosphere.
    Type: Grant
    Filed: November 12, 1991
    Date of Patent: October 26, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Tohru Kida
  • Patent number: 5252297
    Abstract: An apparatus for producing carbon black comprises a reaction chamber which consists of a tapered throat and a downstream extension of the throat having the same diameter as that of the narrowest portion of the throat and provided with a plurality of ribs on its inner wall which define a plurality of flits parallel to the axis of the reaction chamber. The reaction chamber is equipped, on the upstream side of the extension, with means for introducing the feedstock oil perpendicularly to the axis of the chamber.
    Type: Grant
    Filed: November 8, 1991
    Date of Patent: October 12, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Kiyonari Nakai
  • Patent number: 5246894
    Abstract: A silicon carbide reinforced composite material comrpising a base material and, dispersed therein, a reinforcement comprising a silicon carbide whisker and an elliptical silicon carbide particle.
    Type: Grant
    Filed: March 26, 1992
    Date of Patent: September 21, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Hiroshi Okuda, Itsuro Imazu
  • Patent number: 5231129
    Abstract: A rubber composition comprising 100 parts by weight of a rubber ingredient compounded with 35-100 parts of a carbon black, said carbon black having a nitrogen adsorption specific surface area (N.sub.2 SA) of 60-160 m.sup.2 g and a dibutyl phthalate adsorption number (DBP) of 90-150 ml/100 g, and the intraaggregate mode diameter (Dp mode diameter) of the carbon black satisfying the following formula:Dp mode diameter .gtoreq.75.2.times.(DBP/N.sub.2 SA)+8.0 wherein the Dp mode diameter refers to a mode diameter at the maximum frequency in the pore diameter distribution of carbon black particles measured by means of a differential scanning calorimeter (DSC).
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: July 27, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Shinji Misono
  • Patent number: 5230878
    Abstract: A carbon black of the category of hard carbon blacks having a nitrogen adsorption specific surface area (N.sub.2 SA) of 120 to 165 m.sup.2 /g and a DBP absorption number of 120 ml/100 g or more and satisfying requirements respectively represented by the following formulae (1) and (2):Dst.ltoreq.(4.35.times.dn)-10.0 (1) ##EQU1## In the formulae (1) and (2), dn is the arithmetic average diameter (nm) measured by electron microscopy, .DELTA.Dst (nm) is the difference between two Stokes diameters each obtained in a frequency of 50% of the maximum frequency in a distribution curve of the aggregate Stokes diameter, Dst (nm) is the Stokes diameter of the maximum frequency in the distribution curve of the aggregate Stokes diameter, N.sub.2 SA is the nitrogen adsorption specific surface area (m.sup.2 /g) and IA is the iodine adsorption number (mg/g).
    Type: Grant
    Filed: November 27, 1991
    Date of Patent: July 27, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Kiyonari Nakai, Fumio Takemura
  • Patent number: 5225475
    Abstract: A rubber composition comprising 100 parts by weight of a rubber component which consists of a natural rubber alone or a blend of a natural rubber with a dienic synthetic rubber and from 35 to 100 parts by weight of a carbon black compounded into the rubber. The carbon black has a nitrogen adsorption specific surface area (N.sub.2 SA) of 100 to 160 m.sup.2 /g and also a true specific gravity and a mode diameter of intraaggregate pore (Dp) which satisfy, respectively, the relations1 true specific gravity.ltoreq.1.8379-0.0006.times.N.sub.2 SA(1) ##EQU1## where Dp in the formula (2) represents the mode diameter at the maximum frequency in the intraaggregate pore diameter distribution of the carbon black determined with a differential scanning calorimeter (DSC), and DBP represents the dibutyl phthalate absorption number.
    Type: Grant
    Filed: October 30, 1991
    Date of Patent: July 6, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Shinji Misono
  • Patent number: 5198205
    Abstract: There is disclosed carbon black for a tire tread rubber which has a nitrogen adsorption specific surface area (N.sub.2 SA) of 60 to 160 m.sup.2 /g and a dibutyl phthalate absorption (DBP) of 90 to 150 ml/100 g which belong to the respective regions of hard grades of carbon black, and an intraaggregate void volume Vp (ml/g) at least equal to the value calculated according to the equation: [0.00976.times.DBP-0.0358].
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: March 30, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Yasuharu Yoshii, Shinji Misono, Hitoshi Ue
  • Patent number: 5194409
    Abstract: The present invention discloses a process for producing a boron nitride-coated SiC whisker, comprising dissolving a borazine represented by the following formula (I) in hexane, dispersing a SiC whisker in the resultant solution, collecting the SiC whisker thus treated by filtration, drying and baking it in a non-oxidizing atmosphere at 1000.degree. to 1800.degree. C. to form a boron nitride coating on the surface of the SiC whisker: ##STR1## wherein R is an atom or a group selected from the group consisting of Cl, N(C.sub.2 H.sub.5).sub.2, NH.sub.2, NHCH.sub.3 and CH.sub.3, and R' is an atom or a group selected from the group consisting of H and CH.sub.3.
    Type: Grant
    Filed: June 14, 1991
    Date of Patent: March 16, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Takaomi Sugihara