Compositions – Electrically conductive or emissive compositions – Elemental carbon containing
Patent
1989-11-20
1991-02-05
Chaudhuri, Olik
Compositions
Electrically conductive or emissive compositions
Elemental carbon containing
252510, 4234471, 4234472, 4234474, 4234476, 423448, 264 292, 264 297, H01B 118
Patent
active
049902857
ABSTRACT:
Carbon fibers having balanced properties comprising an ultra-high modulus greater than 100 Mpsi and a high tensile strength of greater than 500 kpsi. The carbon fibers are derived from a solvent fractionated pitch having a mesophase content of greater than 90% by weight and a quinoline insolubles content of less than 1% by weight. A crude pitch feed is sequentially heat soaked, solvent fractionated, and extruded to form as-spun fibers. The latter are stabilized or infusibilized and then carbonized by multistage heat treatments involving separate precarbonization, carbonization, and graphitization steps with an intermediate cooling step.
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Chaudhuri Olik
E. I. Du Pont de Nemours and Company
Kunemura Robert M.
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