Sumitomo Chemical Company, Limited

Jiro Iseki

Masao Minobe

Shozo Horikiri

Chikanao Kawai

A process for the production of carbon fiber, which comprises sulfonating polyethylene fiber with chlorosulfonic acid, sulfuric acid, fuming sulfuric acid or a mixture of two or more kinds thereof and carbonizing the resulting precursor fiber by heating at a temperature of 600.degree. to 3,000.degree. C, optionally while giving a tension to the fiber.

Process for production of carbon fiber

A process for the production of carbon micro-balloons and carbon micro-spheres which comprises reacting polymeric microparticles with sulfuric anhydride or chlorosulfonic acid so as to make the surface layer or the whole of the micro-particles infusible and then carbonizing the obtained micro-particles by heating them at a temperature above the decomposition point of the starting polymer.

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Toyonaka, Japan

Jiro Iseki