Method for producing a precursor pitch for carbon fiber

Details Method for producing a precursor pitch for carbon fiber Method for producing a precursor pitch for carbon fiber

C - Chemistry, Metallurgy

10

C

196/39

C10C 3/00 (2006.01)

Patent

CA 1234548

KAWASAKI STEEL 58-38,182 Abstract of the Disclosure Precursor pitch to be used for formation of carbon fiber is produced by heating a coal tar soft or middle pitch at a temperature of 350-500°C at a first stage to form mesophase, extracting the thus treated pitch with a solvent, separating and removing the solvent insoluble portion including mesophase to obtain a pitch containing no free carbon and further at the second stage heat-treating the pitch containing no free carbon in an inert gas atmosphere under atmospheric pressure or a reduced pressure under the following condition 600-1.2 T ? 0 ? 1,800-3.6 T (provided that 350 ? T ? 500) wherein T(°C) is the temperature of the heat treatment and .theta. (min) is the time for which said temperature is held, to form bulk mesophase pitch containing 20-60% by weight of quinoline insoluble portion.

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