Carbonaceous pitch, process for the preparation thereof and use thereof to make carbon fibers
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United States of America Patent
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Mar 12, 1985
Grant Date -
N/A
app pub date -
Feb 7, 1984
filing date -
Feb 8, 1983
priority date (Note) -
Expired
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Abstract
A novel reformed mesophase pitch having a mesophase content MC of between 40 and 100%, a quinoline-insoluble content QI of between 5 and 70 weight % and anisotropic domains forming a continuous phase. The reformed mesophase pitch is obtained by heat-treating a dormant mesophase pitch which comprises dormant anisotropic components which are partially hydrogenated, polycyclic polycondensed ring aromatic hydrocarbons derived from the mesophase of a mesophase pitch by hydrogenation of the mesophase and which are soluble in quinoline. The dormant mesophase pitch is optically isotropic in nature but, upon being subjected to shear forces in one direction, capable of being oriented in said direction. Preferably, the reformed mesophase pitch has a softening point SP in .degree.C. satisfying the following conditions: when 40 .ltoreq.MC<100, ##EQU1## and when MC=100, ##EQU2## The reformed mesophase pitch is useful as precursor materials for carbon fibers.
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