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

1984-08-28

1986-03-11

Metz, Andrew H.

Mineral oils: processes and products

Asphalts, tars, pitches and resins; making, treating and...

Solvent extraction

208 40, 208 44, 4234471, 4234474, C10C 302, C10C 308, D01F 914

Patent

active

045754128

ABSTRACT:
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.degree.-500.degree. 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

REFERENCES:
patent: 4184942 (1980-01-01), Angier et al.
patent: 4277324 (1981-07-01), Greenwood
patent: 4381990 (1983-05-01), Noguchi et al.
patent: 4402928 (1983-09-01), Lewis et al.
patent: 4454019 (1984-06-01), Izumi et al.

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