中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

57 records (took 0.026 seconds)

    1.
    发明专利
    未知

    公开(公告)号：AT93490T

    公开(公告)日：1993-09-15

    申请号：AT89309617

    申请日：1989-09-21

    Applicant: AGENCY IND SCIENCE TECHN ,  KOA OIL CO LTD

    Inventor： YAMADA YASUHIRO ,  FUJII MASAKI ,  SHIMOMURA SEIJI

    IPC: C01B31/04 ,  C04B35/536 ,  C04B38/00 ,  C04B35/54

    Abstract: A method for producing an elastic graphite material having a packing density of 1.0 g/cm or lower and a recovery of 50% or higher at a compressibility of 10 to 90% is provided, which comprises: heating a carbonaceous material rapidly while bringing the carbonaceous material into contact with nitric acid for expansion and foaming, and graphitizing the thus expanded and foamed carbonaceous material.

    PITCH-BASED CARBON FIBERS AND PITCH COMPOSITIONS AND PRECURSOR FIBERS THEREFOR
    5.
    发明专利
    PITCH-BASED CARBON FIBERS AND PITCH COMPOSITIONS AND PRECURSOR FIBERS THEREFOR 未知

    公开(公告)号：GB2129825A

    公开(公告)日：1984-05-23

    申请号：GB8322788

    申请日：1983-08-24

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： YAMADA YASUHIRO ,  IMAMURA TAKESHI ,  HONDA HIDEMASA ,  SAWAKI TORU ,  SASAKI HIDEHARU

    IPC: C10C1/00 ,  C10C3/00 ,  D01F9/15

    Abstract: The invention provides carbon fibers having mechanical properties equivalent to or even better than those of the polyacrylonitrile-based carbon fibers from a bituminous material, e.g. coal tar pitch, as the starting material. The starting pitch is first partially hydrogenated in tetrahydroquinoline under specific conditions followed by a heat treatment to give a pitch composition suitable for spinning which can be characterized by several parameters including the proportions of the carbons and hydrogens having different chemical shifts in the NMR analysis. The pitch composition for spinning is then subjected to spinning under specific conditions including the temperature condition for controlling the viscosity behavior of the molten pitch composition determined by use of the Andrade's equation and the pitch filament is then infusibilized in an oxidative atmosphere and carbonized in an inert atmosphere into carbon fibers having a tensile strength of at least 200 kg/mm2 and a tensile modulus of at least 10 tons/mm2.

    6.
    发明专利
    未知

    公开(公告)号：FR2532322A1

    公开(公告)日：1984-03-02

    申请号：FR8313618

    申请日：1983-08-23

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： YAMADA YASUHIRO ,  IMAMURA TAKESHI ,  HONDA HIDEMASA ,  SAWAKI TORU ,  SASAKI HIDEHARU

    IPC: C10C1/00 ,  C10C3/00 ,  D01F9/15 ,  D01D5/10 ,  D01F9/14

    Abstract: The invention provides carbon fibers having mechanical properties equivalent to or even better than those of the polyacrylonitrile-based carbon fibers from a bituminous material, e.g. coal tar pitch, as the starting material. The starting pitch is first partially hydrogenated in tetrahydroquinoline under specific conditions followed by a heat treatment to give a pitch composition suitable for spinning which can be characterized by several parameters including the proportions of the carbons and hydrogens having different chemical shifts in the NMR analysis. The pitch composition for spinning is then subjected to spinning under specific conditions including the temperature condition for controlling the viscosity behavior of the molten pitch composition determined by use of the Andrade's equation and the pitch filament is then infusibilized in an oxidative atmosphere and carbonized in an inert atmosphere into carbon fibers having a tensile strength of at least 200 kg/mm2 and a tensile modulus of at least 10 tons/mm2.

    PITCH-BASED CARBON FIBERS AND PITCH COMPOSITIONS AND PRECURSOR FIBERS THEREFOR
    7.
    发明专利
    PITCH-BASED CARBON FIBERS AND PITCH COMPOSITIONS AND PRECURSOR FIBERS THEREFOR 未知

    公开(公告)号：GB2129825B

    公开(公告)日：1987-01-07

    申请号：GB8322788

    申请日：1983-08-24

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： YAMADA YASUHIRO ,  IMAMURA TAKESHI ,  HONDA HIDEMASA ,  SAWAKI TORU ,  SASAKI HIDEHARU

    IPC: C10C1/00 ,  C10C3/00 ,  D01F9/15

    Abstract: The invention provides carbon fibers having mechanical properties equivalent to or even better than those of the polyacrylonitrile-based carbon fibers from a bituminous material, e.g. coal tar pitch, as the starting material. The starting pitch is first partially hydrogenated in tetrahydroquinoline under specific conditions followed by a heat treatment to give a pitch composition suitable for spinning which can be characterized by several parameters including the proportions of the carbons and hydrogens having different chemical shifts in the NMR analysis. The pitch composition for spinning is then subjected to spinning under specific conditions including the temperature condition for controlling the viscosity behavior of the molten pitch composition determined by use of the Andrade's equation and the pitch filament is then infusibilized in an oxidative atmosphere and carbonized in an inert atmosphere into carbon fibers having a tensile strength of at least 200 kg/mm2 and a tensile modulus of at least 10 tons/mm2.

    PROCESS FOR THE PRODUCTION OF ASHLESS LIQUID FUELS
    8.
    发明专利
    PROCESS FOR THE PRODUCTION OF ASHLESS LIQUID FUELS 未知

    公开(公告)号：CA1055250A

    公开(公告)日：1979-05-29

    申请号：CA219690

    申请日：1975-02-10

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： HONDA HIDEMASA ,  YAMADA YASUHIRO ,  KAKIYAMA HITOO

    IPC: C10G1/04 ,  C10L1/32

    Abstract: PROCESS FOR THE PRODUCTION OF ASHLESS LIQUID FUELS An ashless liquid fuel of good quality is produced by combining powdery coal with a heavy oil of the petroleum series in an amount of at least 50 parts by weight of heavy oil per 100 parts by weight of the powdery coal, subjecting the mixture to a heat treatment conducted at 400-450.degree.C and thereafter, removing a solid coagualted material formed in the treated product. An especially good result is obtained when a heavy oil of petroleum series having an atomic ratio C/H of at least 0.9 is used.

Patent Agency Ranking