| 摘要 |
PURPOSE:To obtain carbon fibers of a radial structure with cleavage on the surface thereof and further a high elasticity, by melt spinning an optically anisotropic pitch at a specific shear rate in spinneret holes and orientation forming parameter. CONSTITUTION:A pitch containing >=60% optically anisotropic component is melt spun at >=550sec<-1> shear rate in spinneret holes expressed by formula I [Q is the flow rate of the pitch (cm<3>/sec); D is the spinneret hole diameter (cm)] and >=100 orientation forming parameter (f) expressed by formula II [t is the average residence time in the spinneret holes (sec)] to give fibers, which are then infusibilized in the presence of oxygen and carbonized or further graphitized in an atmosphere of an inert gas to afford the aimed carbon fibers.
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