PURPOSE: To mass produce carbon fibers of good quality economically with ease, by modifying asphalt obtained by deasphalting a vacuum distillation bottom residue with butane, pentane, etc. as a solvent under heating and mild reaction conditions, melt spinning the resultant modified asphalt as a raw material, making the resultant fibers infusible, and calcining the resultant infusible fibers.
CONSTITUTION: A petroleum type heavy oil, e.g. obtained by deasphalting a vacuum distillation bottom residue with butane, pentane, hexane or a mixture consisting essentially thereof as a solvent, is oxidized with an oxidizing agent, e.g. hydrogen peroxide, oxygen, air or ozone, and modified under heating at 350W420°C and under ordinary pressure W10kg/cm2.G pressure for 0.5W8hr to give a heat modified asphalt containing 50% or more benzene-insoluble substances, which is then molded by the melt spinning. The resultant fibers are then made infusible and calcined to prepare the aimed carbon fibers.
KAWAMATA NAOYUKI
HAYASHIDANI MASAO
MIYAGAWA TSUGIO
ISOZAKI HIDEO
KAWASAKI STEEL CO
KAWATETSU KAGAKU KK
| JPS4946007A | 1974-05-02 |