PREPARATION OF PITCH CARBON FIBER

PURPOSE:To obtain carbon fibers having a high elasticity and high strength from a uniform low-melting pitch in melt spinning, by using an optically isotropic pitch exhibiting a specific reflectance as a raw material. CONSTITUTION:An optically isotropic pitch, exhibiting 9.0-11.0% reflectance, and co...

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Bibliographische Detailangaben
Hauptverfasser:	HIROSE TAKAO, KATOU OSAMU, KAMIMURA SEIICHI, YAMAMOTO SHIYUNICHI, TAKASHIMA HIROAKI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMISTRY FUELS LUBRICANTS METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES PEAT PETROLEUM, GAS OR COKE INDUSTRIES PYROLIGNEOUS ACID SPINNING TECHNICAL GASES CONTAINING CARBON MONOXIDE TEXTILES WORKING-UP PITCH, ASPHALT, BITUMEN, TAR
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain carbon fibers having a high elasticity and high strength from a uniform low-melting pitch in melt spinning, by using an optically isotropic pitch exhibiting a specific reflectance as a raw material. CONSTITUTION:An optically isotropic pitch, exhibiting 9.0-11.0% reflectance, and containing the mesophase is used as a raw material. For example, a petroleum, e.g. naphtha or kerosene, is steam cracked at 700-1,200 deg.C to prepare an olefin. A heavy oil, produced in the process as a byproduct, and having 200- 450 deg.C boiling point is molten in an inert gaseous atmosphere to form a liquid, which is then formed into a thin film of