Hodogaya Chemical Co., Ltd.

Bussan Nanotech Research Institute, Inc.

Subiantoro

Takayuki Tsukada

Tsuyoshi Okubo

Jiayi Shan

Koichi Handa

An composite material is disclosed, which includes carbon fibrous structures which are capable of being included in a relatively large amount in the composite material, and which are capable of improving the physical properties, such as electric, mechanical, or thermal properties. The carbon fibrous structure comprises (a) carbon fibrous structures each of which comprises a three dimensional network of carbon fibers, each of the carbon fibers having an outside diameter of 15-100 nm, wherein the carbon fibrous structure further comprises a granular part, at which the carbon fibers are bound in a state that the carbon fibers are extended outwardly therefrom, and wherein the granular part is produced in a growth process of the carbon fibers, and (b) an material other than the carbon fibrous structures, wherein the amount of carbon fibrous structures added is more than 30% and not more than 100% by weight of the total weight of the composite.

Composite material

A composite material includes a matrix and carbon fibrous structures. The carbon fibrous structure has a three dimensional network of carbon fibers, each having an outside diameter of 15&#x2013;100 nm, and has a granular part with which carbon fibers are bound in a state such that the carbon fibers extend outwardly from the granular part, and the granular part being produced in a growth process of the carbon fibers. The additive amount of the carbon fibers is in the range of 0.1 to 30% by weight of total weight of the composite material.

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Tokyo, Japan

Subiantoro