NEOMESOPHASE PITCH

摘要

A process for increasing that fraction of an isotropic carbonaceous pitch which is capable of being thermally converted to an optically anisotropic carbonaceous pitch having less than 25 wt. % quinoline insolubles is described. Basically, the pitch is heated at elevated temperatures until spherules visible under polarized light begin to appear. Then heating is terminated and the pitch solvent extracted to provide a solvent insoluble fraction which is capable of being thermally converted to the optically anisotropic pitch.