Petoca, Ltd.

Shin-ichi Nayuki

Hideyuki Nakajima

Toshiyuki Ito

Yoshinori Suto

Hiroyasu Ogawa

Harumitsu Enomoto

Keiichiro Okamura

Yoshiyuki Suzuki

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.

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

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Kamisu-machi, Japan

Shin-ichi Nayuki