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    PRECURSOR FOR PRODUCING CARBON FIBER
    22.
    发明专利
    PRECURSOR FOR PRODUCING CARBON FIBER 失效

    公开(公告)号：JPH0284505A

    公开(公告)日：1990-03-26

    申请号：JP10814989

    申请日：1989-04-26

    Applicant: TORAY INDUSTRIES

    Inventor： KOBAYASHI MAKOTO ,  OHARA HARUO ,  TSUNODA ATSUSHI

    IPC: C08F220/04 ,  C08F220/00 ,  C08F220/10 ,  C08F220/18 ,  C08F220/44 ,  D01F6/18 ,  D01F6/38 ,  D01F9/22

    Abstract: PURPOSE:To provide the subject precursor having an oxygen concentration ratio of =85% of acrylonitrile, 1-10% of a polymerizable unsaturated carboxylic acid ester (e.g., normal butyl methacrylate) and 0.25-5% of a polymerizable unsaturated carboxylic acid (e.g., itaconic acid) is copolymerized in a solvent such as dimethyl sulfoxide to prepare a spinning raw solution, which is spun out in an aqueous dimethyl sulfoxide solution from a spinneret, followed by drawing the produced fiber and subsequently subjecting the drawn fiber to a fire-resisting treatment at 260 deg.C for 5min and further at 280 deg.C for 5min in air at atmospheric pressure to provide the objective carbon fiber precursor having an oxygen concentration ratio of

    PRODUCTION OF IMPROVED GRAPHITE FIBER
    23.
    发明专利
    PRODUCTION OF IMPROVED GRAPHITE FIBER 失效

    公开(公告)号：JPH01292119A

    公开(公告)日：1989-11-24

    申请号：JP12133288

    申请日：1988-05-18

    Applicant: TORAY INDUSTRIES

    Inventor： MIZUGUCHI TOYOKAZU ,  ONO KEIZO ,  TSUNODA ATSUSHI

    IPC: D01F9/22 ,  D01F9/14

    Abstract: PURPOSE:To obtain a graphite fiber while preventing the clogging of a furnace caused by deposited metal, the fluffing of the treated yarn and the lowering of the fiber strength, etc., by graphitizing a carbon fiber under the supply of an inert gas and chlorine gas as the atmospheric gas in the graphitizing furnace. CONSTITUTION:The objective graphite fiber can be produced by graphitizing a carbon fiber in a graphitizing furnace at a maximum heat-treatment temperature of >=2000 deg.C under the supply of an inert gas (preferably nitrogen) and chlorine gas as the atmospheric gas in the furnace. The chlorine concentration in the mixed gas is preferably 0.001-0.1%.

    MELT-SPINNING OF ACRYLONITRILE POLYMER
    24.
    发明专利
    MELT-SPINNING OF ACRYLONITRILE POLYMER 失效

    公开(公告)号：JPH01266213A

    公开(公告)日：1989-10-24

    申请号：JP8969988

    申请日：1988-04-12

    Applicant: TORAY INDUSTRIES

    Inventor： MIZUGUCHI TOYOKAZU ,  TSUNODA ATSUSHI ,  ONO KEIZO

    IPC: D01F6/38 ,  C08F220/00 ,  C08F220/44 ,  D01F6/18

    Abstract: PURPOSE:To obtain the subject fiber having void-free dense texture and excellent strength and dyeability, without using water and a plasticizer, by emulsion- polymerizing an acrylonitrile-type unsaturated monomer, subjecting the resultant polymer to coagulation, washing with water and drying and extruding the product in molten state with pressure under specific condition. CONSTITUTION:A polymer having a relative viscosity of 1.4-1.9 is produced by the emulsion polymerization of unsaturated monomers composed mainly of 70-95mol% of acrylonitrile and 5-30mol% of a monomer copolymerizable with said acrylonitrile [e.g. (meth)acrylic acid or methyl (meth)acrylate]. The obtained polymer is coagulated, washed with water and dried by conventional method. The objective fiber is produced by extruding the dried product at 190-280 deg.C, preferably 210-260 deg.C in molten state under pressure into atmosphere of normal temperature while keeping the residence time of the polymer in the heating part of the extruder to 1-10min, preferably 1-5min.

    CARBON FIBER
    27.
    发明专利
    CARBON FIBER 失效

    公开(公告)号：JPH0931758A

    公开(公告)日：1997-02-04

    申请号：JP16314696

    申请日：1996-06-24

    Applicant: TORAY INDUSTRIES

    Inventor： KOBAYASHI MAKOTO ,  OHARA HARUO ,  TSUNODA ATSUSHI

    IPC: C08F220/46 ,  C08F220/42 ,  D01F6/18 ,  D01F6/38 ,  D01F9/22

    Abstract: PROBLEM TO BE SOLVED: To obtain a carbon fiber having an improved tensile strength and elastic modulus and having high strength and high quality by subjecting an acrylic copolymer having a specific composition to a flame resistance treatment followed by baking. SOLUTION: A dense acrylic fiber is produced by subjecting a copolymer produced from >=85% of acrylonitrile, 1-10% of at least one kind of a polymerizable unsaturated carboxylic acid alkyl ester selected from an n-propyl ester, an n-butyl ester, an isobutyl ester, a secondary butyl ester and a >=5C alkyl ester of (meth)acrylic acid and 0.25-5% of at least one kind of a polymerizable unsaturated carboxylic acid selected from (meth)acrylic acid and itaconic acid to wet spinning followed by elongation and drying. Subsequently, the acrylic fiber is subjected to a flame resistance treatment at 260 deg.C for 5min in air under normal, pressure and further at 280 deg.C for 5min to obtain an acrylic fiber having an oxygen concentration ratio between the inner layer and the outer layer of a single yarn determined by secondary ion mass spectrometry of =389kgf/mm .

    CARBON FIBER EXCELLENT IN ADHESION TO RESIN
    29.
    发明专利
    CARBON FIBER EXCELLENT IN ADHESION TO RESIN 失效

    公开(公告)号：JPH03100025A

    公开(公告)日：1991-04-25

    申请号：JP23828589

    申请日：1989-09-13

    Applicant: TORAY INDUSTRIES

    Inventor： MIZUGUCHI TOYOKAZU ,  MATSUKI TOMIJI ,  TSUNODA ATSUSHI

    IPC: C08J5/06

    Abstract: PURPOSE:To improve the adhesion to a resin, heat resistance, handling properties, and bundling properties by attaching a specific hot water-sol. copolyester to a carbon fiber. CONSTITUTION:An acid component comprising terephthalic acid, 8-16mol% 5-sodium sulfoisophthalic acid, 5-30mol% aliph. dicarboxylic acid (e.g. malonic acid) 5-40mol% isophthalic acid, and a polyacid anhydride (e.g. polydodecanedionic anhydride) obtd. from a 3-28C aliph. dicarboxylic acid in an amt. of 0-20wt.% based on the total resulting copolyester is reacted with a glycol component comprising ethylene glycol and a polyalkylene glycol (deriv.) (e.g. polyethylene glycol) having a number-average mol.wt. of 400-6000 in an amt. of 0-20wt.% based on the total resulting copolyester to give a hot water-sol. copolyester. The resulting copolyester in an amt. of 0.3-15wt.% is attached to a carbon fiber.

    PROVISION OF FLAME RESISTANCE
    30.
    发明专利
    PROVISION OF FLAME RESISTANCE 失效

    公开(公告)号：JPH01118624A

    公开(公告)日：1989-05-11

    申请号：JP27038487

    申请日：1987-10-28

    Applicant: TORAY INDUSTRIES

    Inventor： AKIMOTO TATSUO ,  TSUNODA ATSUSHI ,  OGASAWARA MASASHI

    IPC: D01F9/22 ,  D01F9/14 ,  D01F9/32

    Abstract: PURPOSE:To provide precursor fiber assembly with flame resistance while preventing fusing among single fibers, by applying, in advance, a silicone compound to said assembly to be subjected to heating process in a fluidized bed consisting of heating medium granules. CONSTITUTION:A precursor fiber assembly 101 is afforded with a silicone compound before feeding to the heating medium fluidized bed 5 in an oven 1 for provision of flame resistance. Said silicone compound can be applied either in the form of a lubricant or incorporated in the raw polymer. The amount of said silicone compound to be given uniformly is such as to be 0.1-5wt.% based on the fiber. Thus, even when subjected to heating process at high temperatures, fusing among single fibers will be prevented.

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