Mitsubishi Rayon Company, Limited

Hiroaki Yoneyama

Munetsugu Nakatani

Yoshitaka Imai

Yoshiteru Tanuku

Yoshihiro Nishihara

A carbon fiber of a high tenacity and a high modulus of elasticity having a fiber diameter of 1 to 6 .mu.m, a strand tenacity of 430 kg/mm.sup.2 or more, a strand modulus of elasticity of 28 ton/mm.sup.2 or more and a density of 1.755 g/cm.sup.3 or more, and a process for producing the same. The above-mentioned carbon fiber has extremely useful properties as a raw material for composite materials to be used not only for sporting goods such as fishing rods or golf clubs but also in aerospace industries.

Carbon fibers having high tenacity and high modulus of elasticity and

Carbon based porous hollow fiber membrane and method for producing same

Acrylonitrile precursor fibers are subjected to a flame-resisting treatment, in an oxidizing atmosphere, while being elongated at least 3%, until a density of 1.22 g/cm.sup.3 is reached. The fibers are further treated to increase density up to 1.40 g/cm.sup.3, and then heat treated while undergoing further elongation, followed by higher temperature heat treatment while under tension. The resulting fibers have excellent properties, including high strand tenacity, high strand modulus, and high density.

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Ohtake, Japan

Hiroaki Yoneyama