PROCESS FOR PREPARATION OF FILLER-CONTAINING POLYTETRAFLUOROETHYLENE FINE POWDER

摘要

A process for preparation of filler-containing polytetrafluoroethylene fine powder by coagulating polytetrafluoroethylene together with at least one filler selected from the group consisting of polyimide resins, polyamide-imide resins, polyamide resins and carbon fiber powders from their aqueous dispersion, characterized in that a water-insoluble organic liquid having a boiling point of from 30 DEG to 150 DEG C. and a surface tension of not more than 35 dyne/cm at 20 DEG C. is added to the aqueous dispersion under agitation at any stage from the start to the end of the coagulation.