Showa Denko K.k.

Hirokazu Yamada

Yohsuke Hirao

Ryosuke Kamei

Masao Sumita

Yukio Fukuyama

A process for making an electroconductive polymer composition containing a matrix composed of a mixture of at least two polymers which are incompatible with each other, and an electroconductivity-imparting filler distributed predominantly in the polymer having a higher affinity with the filler. The plastic composition exhibits a higher conductivity than that obtained by blending each of the polymers as the matrix with the same filler.

Process for making an electroconductive polymer composition

A method for producing composite staple fibers whereby resin matrix and fine and short inorganic reinforcing fibers (e.g., vapor growth carbon fibers and/or potassium titanate whiskers) are processed. A resin material and fine and short inorganic reinforcing fibers having a fiber diameter of 1 .mu.m or less are blended, heated, and mixed to prepare a molten polymer containing dispersed reinforcing fibers. The molten polymer is spouted out of small apertures in a high speed rotator to form filaments. Hot gas is blown onto the spouted filaments to form composite staple fibers. Instead of using the spouting step and the hot gas blowing step, one can spin the molten polymer from spinning apertures into filaments, and simultaneously blow hot gas onto the filaments at a high flow velocity from gas discharging holes arranged near the spinning apertures to draw and cut the filaments into the staple fibers.

Method of producing composite staple fibers consisting of resin matrix

A method of producing vapor growth carbon fibers which are grown in a rection space by thermally decomposing gaseous hydrocarbon and by using transition metal fine particles as the catalyst, wherein the reaction space is filled with ceramic granules which serve as a radiation heat transfer medium and are moved to prevent an intermingling of the growing carbon fibers, so that the grown carbon fibers are conveyed from the reaction space by a gas stream.

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Oita, Japan

Hirokazu Yamada