| 摘要 |
PURPOSE:To obtain a carbon fiber having different optical properties between the peripherals part and the core part, by melt-spinning a specific spinning pitch produced by adding an optically isotropic pitch to an optically anisotropic pitch and subjecting the spun fiber to infusibilization, carbonization and graphitization. CONSTITUTION:A freshly prepared optically isotropic pitch is added to an optically anisotropic pitch prepared from coal tar pitch to obtain a spinning pitch having a meso-phase content of 60-95vol% and a benzene-insoluble content of 80-95wt% and containing a matrix phase exhibiting bulk meso-phase when observed by a polarization microscope. A pitch fiber produced by the melt-spinning of the pitch is infusibilized, carbonized and, if necessary, graphitized to obtain the objective fiber having a peripheral part composed of an optically isotropic component and a core part composed of an optically anisotropic component which may contain an isotropic component as a part thereof.
|
