Pitch as a raw material for making carbon fibers and process for

Details Pitch as a raw material for making carbon fibers and process for Pitch as a raw material for making carbon fibers and process for

1983-02-23

1986-07-01

Metz, Andrew H.

Mineral oils: processes and products

Products and compositions

Asphalts, tars, pitches and resins

208 39, 208 44, 4234472, C10C 300, C10C 302, D01F 912

Patent

active

045978530

ABSTRACT:
A pitch is disclosed which is used as a raw material for making carbon fibers. The pitch has a quinoline insoluble content of 7-18% by weight and a toluene insoluble content of 70-90% by weight. Further, the pitch preferably has a n-heptane soluble content of 1.0% by weight or less. A process for producing the pitch is also disclosed. The process comprises carrying out thermal modification of a petroleum heavy residual oil having a boiling point of 400.degree. C. or more (atmospheric pressure) and a sulfur content of 1.5% by weight or less. Insoluble substances are then separated and removed by heating at a temperature of 380.degree. C. or less. Thereafter, a low boiling point fraction is removed by vacuum distillation. The pitch can be utilized to producd carbon fibers without breaking of filaments in spinning or adhesion by fusion of the fibers in infusibilization. The carbon fibers produced have a high tensile strength and high modulus of elasticity.

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Carbon, vol. 16, No. 3, pp. 205-209, "The Influence of the Type of Quinoline Insolubles on the Quality of Coal Tar Binder Pitch", D. Ball.

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