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    PITCH-BASED CARBON FIBERS AND PITCH COMPOSITIONS AND PRECURSOR FIBERS THEREFOR
    3.
    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.

    4.
    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.

    A METHOD FOR THE PREPARATION OF PITCHES FOR SPINNING CARBON FIBERS
    7.
    发明专利
    A METHOD FOR THE PREPARATION OF PITCHES FOR SPINNING CARBON FIBERS 未知

    公开(公告)号：DE3465748D1

    公开(公告)日：1987-10-08

    申请号：DE3465748

    申请日：1984-04-24

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： YAMADA YASUHIRO ,  IMAMURA TAKESHI ,  SHIBATA MASAO ,  ARITA SEIJI ,  HONDA HIDEMASA

    IPC: C10C3/10 ,  C10C3/00 ,  C10C3/02 ,  D01F9/15 ,  C10C1/00 ,  D01F9/14

    Abstract: The invention provides a method for the preparation of a pitch spinnable into pitch filaments as a precursor of carbon fibers starting from a pitch material such as coal tar and coal tar pitch. Different from the conventional procedure involving hydrogenation of the starting pitch, the starting pitch in the inventive method is first heated together with an aromatic oil, preferably, in the presence of a cracking catalyst such as siii- ca-aiumina and zeolite at 350 to 500°C for 10 to 60 minutes under no pressurization with hydrogen and, after removal of insoluble materials, then heated at a temperature of 430 to 600°C. The thus obtained pitch for spinning has good spinnability and the carbon fibers prepared from the pitch have a unique microscopic structure and excellent physical properties exceeding by far the conventional pitch-based carbon fibers and approximating the HP-grade carbon fibers prepared from polyacrylonitrile fibers.

    8.
    发明专利
    未知

    公开(公告)号：DE3330575A1

    公开(公告)日：1984-03-08

    申请号：DE3330575

    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 ,  C10C3/02 ,  D01F9/12

    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
    9.
    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.

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