Petoca, Ltd.

Arisawa Mfg. Co., Ltd.

Toshiyuki Ito

Hideyuki Nakajima

Yoshinori Suto

Hiroyasu Ogawa

Shin-ichi Nayuki

Harumitsu Enomoto

Sanji Arisawa

Keiichiro Okamura

Yoshiyuki Suzuki

Pitch-based carbon fibers on which silicone based spin finish oils remain in the amount of 0.1-2.0% by weight of said fibers and having a stack height of the crystallites L.sub.C (002) of 16-28.ANG., an interlayer spacing distance d.sub.002 of 3.46-3.49.ANG., a tensile strength of 5-50 Kgf/mm.sup.2 and an elongation of 0.3-8.0% are provided. The said pitch-based carbon fibers show good cohesiveness and lubricity of fiber bundles and superior in adaptation to various kinds of processes.

Method for producing pitch-based carbon fibers

Three dimensional woven fabrics containing bent parts of a small radius of curvature which bent parts comprise easily graphitized pitch-derived carbon fibers obtained by thermosetting treatment and light carbonization treatment carried out after melt-spinning of high softening point pitch and having a tensile strength of 15 250 Kgf/mm.sup.2, an elongation of 0.5-8.0% and modulus of elasticity of 400-40,000 Kgf/mm.sup.2 and a capability of increasing both of their tensile strength and modulus of elasticity to 1.1 times or greater than the above-mentioned values by additional heat treatment carried out under a relaxed state to have a tensile strength of 150 Kgf/mm.sup.2 or greater and a modulus of elasticity of 40,000 Kgf/mm.sup.2 or greater. They are superior in abrasion resistance, flexion-resisting property and scratch-resisting property and useful as one component of fiber composite materials in reinforcing plastics, metals, cements, ceramics, carbon materials, etc.

Three dimensional woven fabrics of pitch-derived carbon fibers

A method for producing mesophase pitch based carbon fibers which enables to produce high strength high modulus carbon fibers at a relatively low temperature with stabilized production manner. This method comprises carbonizing infusibilized fibers, in an inert atmosphere under no tension state or a tension of 1 mg/denier or less in the first stage to give a specified interlayer spacing and a crystallite thickness and then carbonizing under a tension of 50-300 mg/denier at a temperature of 2600.degree. C. or more in the second stage.

Method for producing high strength, high modulus mesophase-pitch based

A method for producing high strength, high modulus carbon fibers having a modulus of elasticity of 75 tonf/mm.sup.2 or more and a tensile strength of 250 kgf/mm.sup.2 or more is provided. This method comprises graphitizing mesophase-pitch-based carbon fibers at a temperature of 2600.degree. C. or more for several seconds or for several minutes while stretching said fibers with a stretching ratio which satisifies specified relations.

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Kamisu-machi, Japan

Toshiyuki Ito