Showa Denko K.k.

Eiji Kanbara

Hitoshi Inoue

Tomoaki Yoshida

Kotaro Yano

Akihiro Kitazaki

Tomiharu Yamada

Masaharu Toki

Susumu Shibusawa

A vapor grown carbon fiber, each fiber filament of the carbonfiber having a branching degree of at least 0.15 occurrences/&#x3bc;m and a bulk density of 0.025 g/cmor less and a producing method of the carbon fiber by spraying a raw material solution containing a carbon source and a transition metallic compound into a reaction zone and subjecting the raw material solution to thermal decomposition, which is characterized in (1) spraying the raw material solution at a spray angle of 3&#xb0; to 30&#xb0; and (2) feeding a carrier gas through at least one site other than an inlet through which the raw material solution is sprayed, and a composite material comprising the carbon fiber.

Vapor grown carbon fiber, and production method and use thereof

A process for producing roundish alumina particles includes the steps of granulating a composition containing at least one pulverized product of electrofused alumina and sintered alumina having a mean particle size of 5 to 35 &#x3bc;m and at least one species selected from the group consisting of a halogen compound, a boron compound and an alumina hydrate to obtain a granulated product, heating the granulated product at 1,000 to 1,600&#xb0; C., and crushing the heated product.

Spherical alumina particles and production process thereof

A process for producing roundish alumina particles includes heating at 1,000 to 1,600&#xb0; C. a composition containing at least one of electrofused alumina and sintered alumina having a mean particle size greater than 35 &#x3bc;m, and at least one species selected from the group consisting of a halogen compound, a boron compound and an alumina hydrate; and crushing the composition.

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Yokohama, Japan

Eiji Kanbara