Patents Assigned to Tokai Carbon Co., Ltd.
  • Patent number: 10308511
    Abstract: A method for easily producing a graphite powder for use as a lithium secondary battery negative electrode material with small specific surface area while reducing energy consumption, and achieving high graphitization efficiency, includes melt-mixing a coke powder and a carbon precursor binder so that an amount of fixed carbon included in the carbon precursor binder is 5 to 15 parts by mass based on 100 parts by mass of the coke powder, to prepare a mixture, and pressing the mixture to prepare a compact, the coke powder being obtained by heating a green coke powder at 600 to 1450° C. in a non-oxidizing atmosphere, the green coke powder having a cumulative particle size at 50% in a volumetric cumulative particle size distribution of 5 to 50 ?m; heating the compact in a non-oxidizing atmosphere to effect carbonization and graphitization to obtain a graphitized compact; and grinding the graphitized compact.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: June 4, 2019
    Assignee: TOKAI CARBON CO., LTD.
    Inventors: Kazuhiro Yamamoto, Mayuri Komoriya, Motohiro Yamaki, Tomohito Fukugawa, Akihiro Kuroyanagi
  • Patent number: 9975779
    Abstract: A CVD-SiC formed body has low light transmittance and high resistivity, and may suitably be used as a member for an etcher that is used for a semiconductor production process, for example. The SiC formed body is formed using a CVD method, and includes 1 to 30 mass ppm of boron atoms, and more than 100 mass ppm and 1000 mass ppm or less of nitrogen atoms. The SiC formed body preferably has a resistivity of more than 10 ?·cm and 100,000 ?·cm or less, and a light transmittance at a wavelength of 950 nm of 0 to 1%.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: May 22, 2018
    Assignee: TOKAI CARBON CO., LTD.
    Inventors: Takaomi Sugihara, Masaaki Asakura, Takeshi Tokunaga, Tetsuya Sadaki
  • Patent number: 9914835
    Abstract: Carbon black is used as a component of a rubber composition, ensures that the resulting rubber exhibits improved processability, is reinforced in an improved manner, and exhibits low heat buildup, and may suitably be used for a rubber member (e.g., tire tread) and the like for which high abrasion resistance is required. The carbon black includes primary particles having an average particle size of 15 to 35 nm, and forms aggregates having a Stokes mode diameter measured using a centrifugal sedimentation method of 140 to 180 nm, and having a spherical shape when observed using a transmission electron microscope.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: March 13, 2018
    Assignee: TOKAI CARBON CO., LTD.
    Inventors: Masashi Tsuruta, Takeshi Akahane, Hiroki Uchiyama
  • Publication number: 20180037760
    Abstract: Provided is a method for conveniently producing a water dispersion of oxidized carbon black particles that exhibits excellent dispersibility and storage stability, in the case of producing a water dispersion of oxidized carbon black particles by liquid-phase oxidation of carbon black particles using a persulfate. In the method for producing a water dispersion of oxidized carbon black particles by bringing at least one persulfate and carbon black particles into contact to perform liquid-phase oxidation, in the presence of an inorganic alkali in an amount equal to or greater than an amount theoretically necessary for neutralizing an acidic product produced by the liquid-phase oxidation, the persulfate and the carbon black particles are brought into contact in water and subjected to liquid-phase oxidation treatment while being heated.
    Type: Application
    Filed: January 20, 2016
    Publication date: February 8, 2018
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Tomoaki Kirino, Tohru Takei, Yoshihiro Sato, Hironori Nawate
  • Publication number: 20180022926
    Abstract: Provided is a method for easily producing an oxidized carbon black aqueous dispersion that can highly remove multivalent metal ions and exhibit excellent dispersion stability. A method for producing an oxidized carbon black aqueous dispersion by successively performing on an aqueous slurry of oxidized carbon black having one or more anionic functional groups on a surface thereof a neutralization step of mixing an alkali metal hydroxide and performing heating/neutralization in the presence of one or more selected from a water-soluble chelating agent and a salt thereof or after mixing an alkali metal hydroxide and performing heating/neutralization, mixing one or more selected from a water-soluble chelating agent and a salt thereof and a separation and removal step of separating and removing a multivalent metal ion chelate complex from a mixed solution obtained at the neutralization step using a separation membrane.
    Type: Application
    Filed: January 20, 2016
    Publication date: January 25, 2018
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Takuya Sakoda, Yoshihiro Sato
  • Publication number: 20170051124
    Abstract: A novel carbon black can improve rubber properties (e.g., degree of reinforcement and heat buildup). The carbon black has an aggregate void modal diameter Dmp determined by mercury porosimetry of 25 to 60 nm, and has a ratio (?Dmp/modal diameter Dmp) of a half-width ?Dmp of an aggregate void diameter distribution determined by mercury porosimetry to the aggregate void modal diameter Dmp of 0.30 to 0.56.
    Type: Application
    Filed: November 26, 2014
    Publication date: February 23, 2017
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Kengo Kurisu, Hiroki Uchiyama
  • Patent number: 9490157
    Abstract: Semiconductor processing and equipment are disclosed. The semiconductor equipment and processing provide semiconductor wafers with reduced defects.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: November 8, 2016
    Assignee: TOKAI CARBON CO., LTD.
    Inventors: Jitendra S. Goela, Michael A. Pickering, James T. Fahey, Melinda S. Strickland
  • Publication number: 20160177102
    Abstract: Carbon black is used as a component of a rubber composition, ensures that the resulting rubber exhibits improved processability, is reinforced in an improved manner, and exhibits low heat buildup, and may suitably be used for a rubber member (e.g., tire tread) and the like for which high abrasion resistance is required. The carbon black includes primary particles having an average particle size of 15 to 35 nm, and forms aggregates having a Stokes mode diameter measured using a centrifugal sedimentation method of 140 to 180 nm, and having a spherical shape when observed using a transmission electron microscope.
    Type: Application
    Filed: July 24, 2013
    Publication date: June 23, 2016
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Masashi TSURUTA, Takesh AKAHANE, Hiroki UCHIYAMA
  • Patent number: 9145482
    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: Grant
    Filed: February 1, 2011
    Date of Patent: September 29, 2015
    Assignee: TOKAI CARBON CO., LTD.
    Inventors: Ryusuke Harada, Takeshi Akahane
  • Publication number: 20150251911
    Abstract: A method for easily producing a graphite powder for use as a lithium secondary battery negative electrode material with small specific surface area while reducing energy consumption, and achieving high graphitization efficiency, includes melt-mixing a coke powder and a carbon precursor binder so that an amount of fixed carbon included in the carbon precursor binder is 5 to 15 parts by mass based on 100 parts by mass of the coke powder, to prepare a mixture, and pressing the mixture to prepare a compact, the coke powder being obtained by heating a green coke powder at 600 to 1450° C. in a non-oxidizing atmosphere, the green coke powder having a cumulative particle size at 50% in a volumetric cumulative particle size distribution of 5 to 50 ?m; heating the compact in a non-oxidizing atmosphere to effect carbonization and graphitization to obtain a graphitized compact; and grinding the graphitized compact.
    Type: Application
    Filed: July 23, 2013
    Publication date: September 10, 2015
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Kazuhiro Yamamoto, Mayuri Komoriya, Motohiro Yamaki, Tomohito Fukugawa, Akihiro Kuroyanagi
  • Patent number: 9102840
    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: Grant
    Filed: July 1, 2011
    Date of Patent: August 11, 2015
    Assignee: TOKAI CARBON CO., LTD.
    Inventors: Shigehiro Tanaka, Asami Takenaka, Yukari Ishibashi
  • Publication number: 20150151975
    Abstract: A CVD-SiC formed body has low light transmittance and high resistivity, and may suitably be used as a member for an etcher that is used for a semiconductor production process, for example. The SiC formed body is formed using a CVD method, and includes 1 to 30 mass ppm of boron atoms, and more than 100 mass ppm and 1000 mass ppm or less of nitrogen atoms. The SiC formed body preferably has a resistivity of more than 10 ?·cm and 100,000 ?·cm or less, and a light transmittance at a wavelength of 950 nm of 0 to 1%.
    Type: Application
    Filed: September 13, 2012
    Publication date: June 4, 2015
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Takaomi Sugihara, Masaaki Asakura, Takeshi Tokunaga, Tetsuya Sadaki
  • Patent number: 9045583
    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: Grant
    Filed: May 30, 2011
    Date of Patent: June 2, 2015
    Assignee: TOKAI CARBON CO., LTD.
    Inventors: Yukari Ishibashi, Asami Takenaka, Shigehiro Tanaka
  • Patent number: 9018317
    Abstract: A method for producing a pigment dispersion composition having excellent image density, dispersibility, and storage stability, has high resolubility, and forms an ink film having excellent marker resistance and scratch resistance. The method includes bringing a pigment (I) having a surface acidic group and a basic compound (II) having two or more ammo groups selected from a primary amino group and a secondary amino group in its molecule, into contact with each other in an aqueous medium to prepare a pigment having an unreacted surface amino group, bringing the pigment into contact with a polyisocyanate polyurethane resin (III) having two or more isocyanate end groups so that the pigment and the polyisocyanate polyurethane resin are bonded via a urea bond to prepare a dispersion of a polyurethane resin-bonded pigment (A), and heating the dispersion of the polyurethane resin-bonded pigment (A) at 40 to 100° C. for 1 to 30 days.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: April 28, 2015
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Asami Takenaka, Shigehiro Tanaka, Yukari Ishibashi
  • Patent number: 9000449
    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: Grant
    Filed: September 7, 2010
    Date of Patent: April 7, 2015
    Assignees: The University of Tokyo, Tokai Carbon Co., Ltd., National Institute of Advanced Industrial Science and Technology
    Inventors: Hiroshi Fujioka, Tetsuro Hirasaki, Hitoshi Ue, Junya Yamashita, Hiroaki Hatori
  • Patent number: 8728432
    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: Grant
    Filed: July 9, 2010
    Date of Patent: May 20, 2014
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Hironori Arai, Masanobu Maeda
  • Patent number: 8709147
    Abstract: A method for producing a surface-treated carbon black particle aqueous dispersion that exhibits excellent blackness and dispersibility, exhibits excellent storage stability, suppresses feathering, exhibits an excellent discharge capability and rubfastness (quick-drying capability), and suppresses metal corrosion when used in an aqueous black pigment (colorant) ink, is disclosed. The method for producing a surface-treated carbon black particle aqueous dispersion includes providing an aqueous dispersion of oxidized carbon black particles obtained by forming acidic hydroxyl groups on a surface of carbon black particles having a DBP absorption of 120 cm3/100 g or more, neutralizing 5% or more and less than 50% of the acidic hydroxyl groups with a polyvalent cation, and neutralizing the remainder of the acidic hydroxyl groups with a monovalent cation.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: April 29, 2014
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Makoto Sekiyama, Tetsuya Saitoh, Tomoaki Kirino
  • Publication number: 20140000488
    Abstract: A method for producing a surface-treated carbon black particle aqueous dispersion that exhibits excellent blackness and dispersibility, exhibits excellent storage stability, suppresses feathering, exhibits an excellent discharge capability and rubfastness (quick-drying capability), and suppresses metal corrosion when used in an aqueous black pigment(colorant) ink, is disclosed. The method for producing a surface-treated carbon black particle aqueous dispersion includes providing an aqueous dispersion of oxidized carbon black particles obtained by forming acidic hydroxyl groups on a surface of carbon black particles having a DBP absorption of 120 cm3/100 g or more, neutralizing 5% or more and less than 50% of the acidic hydroxyl groups with a polyvalent cation, and neutralizing the remainder of the acidic hydroxyl groups with a monovalent cation.
    Type: Application
    Filed: March 9, 2012
    Publication date: January 2, 2014
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Makoto Sekiyama, Tetsuya Saitoh, Tomoaki Kirino
  • Publication number: 20130338319
    Abstract: A method for producing a pigment dispersion composition having excellent image density, dispersibility, and storage stability, has high resolubility, and forms an ink film having excellent marker resistance and scratch resistance. The method includes bringing a pigment (I) having a surface acidic group and a basic compound (II) having two or more amino groups selected from a primary amino group and a secondary amino group in its molecule, into contact with each other in an aqueous medium to prepare a pigment having an unreacted surface amino group, bringing the pigment into contact with a polyisocyanate polyurethane resin (III) having two or more isocyanate end groups so that the pigment and the polyisocyanate polyurethane resin are bonded via a urea bond to prepare a dispersion of a polyurethane resin-bonded pigment (A), and heating the dispersion of the polyurethane resin-bonded pigment (A) at 40 to 100° C. for 1 to 30 days.
    Type: Application
    Filed: February 7, 2012
    Publication date: December 19, 2013
    Applicant: TOKAI CARBON CO., LTD.
    Inventors: Asami Takenaka, Shigehiro Tanaka, Yukari Ishibashi
  • Patent number: 8524129
    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: Grant
    Filed: May 27, 2010
    Date of Patent: September 3, 2013
    Assignee: Tokai Carbon Co., Ltd.
    Inventor: Kazuhiro Yamamoto