COAL TAR-BASED IMPREGNATING PITCH AND PRODUCTION THEREOF

摘要

PURPOSE:To obtain the subject pitch used for producing carbonaceous materials, such as graphite electrodes, or carbon/carbon composite materials by regulating pitch so as to provide low contents of portions, soluble in hexane and insoluble in benzene without containing any portion insoluble in quinoline. CONSTITUTION:The subject pitch, obtained by adding and mixing (A) 1 pts.wt. coal tar with (B) =2 pts.wt. one or more selected from benzene, toluene and xylene, allowing the resultant mixture to stand, separating the formed superna tant liquid and heat-treating the obtained supernatant liquid at a temperature within the range of 300-380 deg.C and having 5wt.% content of a portion soluble in hexane and =5wt.% content of a portion insoluble in benzene substantially without containing any portion insoluble in quinoline.