Process for the preparation of carbon fibers
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United States of America Patent
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Nov 19, 1985
Grant Date -
N/A
app pub date -
May 17, 1984
filing date -
May 20, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the preparation of carbon fibers, including the steps of: subjecting a raw material oil to thermal cracking conditions at a temperature of between 400.degree. to 500.degree. C. while removing cracked, light hydrocarbon components to obtain a pitch product containing at least 5 weight % of mesophase and not more than 10 weight % of light hydrocarbon components with a boiling point at 60 mmHg (absolute) of 300.degree. C. or less and having a softening point of between 140.degree. and 220.degree. C., the raw material oil having a boiling point of at least 500.degree. C. and containing at least 30 weight % of a residual oil which has a boiling point of at least 500.degree. C. and a metal content of at least 200 weight ppm and which is derived from a napthene base and/or intermediate base petroleum crude; removing the mesophase having a particle size of more than 10 .mu.m from the pitch product to obtain a substantially mesophase-free carbonaceous pitch; spinning the substantially mesophase-free pitch into fibers; rendering the spun fibers infusible; and carbonizing the infusible fibers.
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