Toho Beslon Co., Ltd.

Toho Rayon Co., Ltd.

Toho Belson Co., Ltd.

The Yokohama Rubber Co., Ltd.

Taisei Corporation

Hiroyasu Ogawa

Tetsuro Shigei

Kazuhisa Saito

Shuji Takahashi

Yasuo Suzuki

Kazuo Izumi

Kenji Shimazaki

Kazuhiro Ichimaru

Kenji Sugimoto

Yasuo Kogo

Kenji Niijima

Yutaka Tsuruta

Kozo Tanaka

Kenzi Shimazaki

Kuniomi Suzuki

Yasuo Saji

Teruo Yamamiya

Hiroto Noda

Masahide Aga

Kazuo Nonaka

Mikio Shima

Tomoaki Kanno

Hiroshi Sugeno

Tomoki Koseki

Toshikazu Matsuhashi

Hideo Kurioka

A method for producing graphite fiber comprising graphitizing carbon fiber having a strength of 500 kgf/mm.sup.2 or more and a modulus of elasticity of from 27,000 to 33,000 kgf/mm.sup.2, and having at least on the surface of the fibers, from 0.2 to 2% by weight of an epoxy resin as a sizing agent, from 0.005 to 0.10% by weight of silicon and 0.005 to 0.02% by weight of phosphorus based on the weight of carbon fiber having said epoxy resin, silicon and phosphorus.

Method for producing graphite fiber

A process for electrolytically treating the surface of a carbon fiber without using a surface treatment bath, comprising forming a flow of an electrolyte solution in the form of a liquid film or column at at least one anode and at at least one cathode which alternate along the direction of the length of the carbon fiber, and passing carbon fiber strands through the flows of the electrolyte solution to apply electric current to the carbon fiber strands.

Process for the surface treatment of carbon fiber strands

A carbon fiber-reinforced cementitious composite having high strength, which comprises continuous carbon fibers and a cured cement composition, comprising cement particles having an average particle size up to about the average diameter of the carbon fibers, the cured cement composition being substantially interposed between the individual carbon fibers; and a method for producing it.

Carbon fiber-reinforced cementitious composite and method for producing

A carbon fiber cord for rubber reinforcement, comprising (A) a carbon fiber bundle comprising carbon fibers selected from the group consisting of carbon fibers having coated thereon from 0.1 to 1% by weight of at least one epoxy resin composition and carbon fibers having coated thereon from 0.5 to 15% by weight of a metal selected from the group consisting of copper, nickel, zinc, and cobalt, and (B) a phenol-formalin-rubber latex type adhesive for rubber impregnated to said carbon fiber bundle in an amount of from 10 to 30% by weight, and said epoxy resin is selected from the group consisting of

Carbon fiber cord for rubber reinforcement and process for producing the

A carbon fiber cord for rubber reinforcement comprising a carbon fiber bundle having coated thereon from 5 to 50% by weight, based on the total weight of the carbon fiber bundle thus treated, of a resin composition comprising a mixture of 100 parts by weight of a butadiene-acrylonitrile copolymer having a carboxyl group on at least both terminals of the molecule of the copolymer and from 5 to 40 parts by weight of an epoxy resin, or a reaction mixture obtained therefrom, and a curing agent for the epoxy resin, and further coated thereon from 0.5 to 5% by weight, based on the total weight of the carbon fiber bundle and the resin composition coated thereon, of a mixture of a phenolformalin-rubber latex type adhesive for rubber. The carbon fiber cord exhibits excellent adhesion to rubber and fatigue resistance.

Carbon fiber cord for rubber reinforcement

A friction material containing from about 0.5-29 wt % of carbonaceous fibers with a bond nitrogen content of from about 14 to 21 wt %, an auxiliary material and a thermosetting resin. The material has good wear and temperature resistance characteristics and can be used in power transmissions and brakes.

Friction material

An acrylic fiber having applied thereto a polyoxyalkylene aminopolysiloxane compound having a viscosity of from 5 to 500 poises at 25.degree. C. and which is represented by formula (I) as an oiling agent: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 each represents a lower alkyl group or an aryl group,

Precursor for production of preoxidized fibers or carbon fibers

A carbonaceous fiber having a carbon content of from 70 to 90%, a high tensile strength and a high modulus of elasticity, which is produced by a method which comprises preoxidizing an acrylic fiber in an oxidizing atmosphere at a temperature of from 10.degree. to 60.degree. C. below the decomposition point of said fiber, to prepare a preoxidized fiber having a degree of orientation of not less than 78% at an angle of X-ray diffraction (2.theta.) of 25.degree. and a specific gravity of from 1.30 to 1.40, pyrolyzing the preoxidized fiber in an inert gas atmosphere by passing the fiber firstly through a lower temperature zone having a temperature of not higher than 750.degree. C. and then through a higher temperature zone having a temperature of from 750.degree. to 950.degree. C., during the pyrolysis controlling the tension of the fiber so that the change of the fiber length during pyrolyzing is from +16% to -8.8% based on the length of the preoxidized fiber.

High-strength carbonaceous fiber

An activated carbon fiber spun yarn having excellent workability and adsorptive property is disclosed. The activated carbon fiber spun yarn comprising activated carbon fibers having a specific surface area of 500 to 1,500 m.sup.2 /g, a ductility of at least 0.5%, and a tensile strength of at least 10 kg/mm.sup.2 and derived from acrylonitrile-based fibers. The spun yarn has a twist coefficient of 30 to 60.

Activated carbon fiber spun yarn

Acrylonitrile fibers suitable for production of preoxidized fibers, fibrous active carbon and carbon fibers, which have thereon a water-soluble basic aluminum salt of the formula:

Acrylonitrile fibers, a process for producing acrylonitrile fibers, as

An aqueous emulsion type sizing agent for carbon fibers is disclosed. The sizing agent contains a compound represented by the following general formula (I): ##STR1## wherein A represents (C.sub.2 H.sub.4 O).sub.l or (C.sub.2 H.sub.4 O).sub.n (C.sub.3 H.sub.6 O).sub.m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1.ltoreq.n/m.ltoreq.35)]; a compound represented by the following general formula (II): ##STR2## wherein R represents C.sub.q H.sub.2q+1 or ##STR3## (q is 10 to 18; and p is 15 to 70); and an epoxy resin, a process for preparation of the agent, and the method for using it are also disclosed. The sizing agent has excellent emulsion stability and heat stability, and it can impart excellent bundling properties to carbon fibers.

Emulsion type sizing agent for carbon fibers, process for its

A method for producing carbon fibers exhibiting excellent adhesive properties to resins and having high strength and heat-oxidation resistance, comprising electrically treating high strength carbon fiber in an aqueous solution of a sulfuric acid salt under conditions such that the current density is from about 0.05 to 0.5 A/m.sup.2 and the product of current density, voltage, and processing time is from about 0.02 to 8 A-V-min/m.sup.2, while continuously moving the carbon fiber as an anode in the aqueous solution.

Surface-treatment of carbon fiber

An acrylonitrile based fiber is disclosed which is composed of copolymers comprising at least 96 mole % of acrylonitrile and 1.times.10.sup.-2 to 70.times.10.sup.-2 mole % of a vinyl component or vinyl components containing acidic groups, and containing a specific amount of zinc. The fiber is used in production of oxidized or flame resistant fiber. The oxidized or flame resistant fiber is produced by heat-treating or oxidizing the acrylonitrile based fiber in an oxidation furnace equipped with a plurality of roller units while limiting the shrinkage of the acrylonitrile based fiber within specific limits as the oxidation proceeds. On carbonizing the above oxidized or flame resistant fiber while limiting the shrinkage thereof a carbon fiber which is of high strength and low fluffing is obtained.

Production of carbon fibers from acrylonitrile based fibers

A vertical heating apparatus for production of graphite fibers from preoxidized fibers or carbon fibers comprises of a tubular heating element which generates heat by high frequency induction. A heat-insulating material layer surrounds the tubular heating element coaxially. The layer is composed of carbon particles having specific grain diameters and angles of repose. A high frequency induction unit is provided around the heat-insulating material layer also in a coaxial relation thereof.

Apparatus for production of graphite fibers

A process for producing carbon fibers which comprises feeding an inert gas into a vertical furnace at about 500 to about 1,000.degree. C. and into a transverse furnace at about 800 to about 2,000.degree. C. connected thereto so that the inert gas flows from the transverse furnace toward the bottom of the vertical furnace and then to the top of the vertical furnace, and feeding preoxidized fibers from the top of the vertical furnace to pass the fibers countercurrent to the inert gas flow through the two furnaces to thereby carbonize the fibers. Apparatus of the type shown in the drawing for the production of carbon fibers by the above process. Carbon fibers having good performance can be produced with good efficiency.

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Shizuoka, Japan

Hiroyasu Ogawa