PROCESS FOR PREPARATION OF CARBON FIBERS HAVING STRUCTURE REFLECTED IN CROSS SECTIONAL VIEW THEREOF AS RANDOM MOSAIC

摘要

PROCESS FOR PREPARATION OF CARBON FIBERS HAVING STRUCTUREREFLECTED IN CROSS SECTIONAL VIEW THEREIN AS RANDOM MOSAICABSTRACT OF THE DISCLOSURE;A process is described for preparation of carbon fiberswherein pitch fibers are prepared from a mesophase-pitchcontaining not more than 80% by weight of a quinoline-insoluble component and showing, under a polarizationmicroscope, more than 70 % of optically anisotropic region,comprising the steps of subjecting a mesophase-pitch havinga viscosity of 10 to 100 poise at a spinning temperatureof 330 to 450°C, to rotating-centrifugal-spinning in arotating-centrifugal spinning machine with a nozzle periph-eral velocity of 300 to 1000 m/min and exposing the thusspun mesophase pitch fibers to a flow of a gas in thespinning direction at a temperature of 280 to 400°C andat a linear velocity of 50 to 200 m/sec, thereby prepar-ing pitch fibers showing a random mosaic cross sectionalpattern. The pitch fibers are then converted to carbonfibers by infusibilization, carbonization andgraphitization.