CARBON FIBER, PITCH FOR USE IN PRODUCTION OF CARBON FIBER AND PRODUCTION OF SAID PITCH

摘要

PURPOSE:To provide pitch for use in production of a carbon fiber which has an excellent melt spinnability and an excellent quality, by dispersing carbonaceous pitch in an organic solvent and treating the dispersion thus obtd with a base and/or an acid so as to remove acid and/or basic components. CONSTITUTION:Pitch for use in production of a carbon fiber which is substantially free from acid and/or basic components is obtd. by dispersing carbonaceous pitch (e.g., coal pitch) in an org. solvent (e.g., chloroform) and adding a base, e.g., NaOH, and/or an acid (e.g. H2SO4) to the dispersion so as to remove an acid component (e.g. a phenol compd.) and/or a basic component (e.g. a pyridine compd.). This pitch is heat treated at 350-500 deg.C, thereby obtaining pitch for spinning having a softening point of 250-350 deg.C and a mesophase content of 65% or more. Then, this pitch for spinning is treated to impart infusibility and carbonized at 900-1,500 deg.C, optionally followed by heating at 2,000-3,000 deg.C for graphitization.