PRODUCTION OF OPTICALLY ANISOTROPIC* DEFORMABLE PITCH* OPTICAL ANISOTROPIC PITCH* AND PITCH FIBER

摘要

An improved process for preparing liquid-crystal containing pitches comprises extracting carbonaceous isotropic pitches with an organic solvent system to provide a solvent insoluble fraction which when heated for 10 minutes or less and to temperatures in the range of about 230. degree. C. to 400° C. will upon polarized light microscopy examination of cooled samples display greater than 75% of an optically anisotropic phase.