Process for preparing polytetrafluoro-ethylene granular powder.

摘要

A process for preparing a polytetrafluoroethylene granular powder which comprises agitating primary particles of a finely divided polytetrafluoroethylene powder having an average particle size of not more than 100 mu m in an aqueous medium containing no organic liquid to form agglomerates while crushing an agglomerated powder in an apparatus having an agitating mechanism of the aqueous medium and a crushing mechanism of the agglomerates within a temperature range between not less than 20 DEG C and less than 60 DEG C. According to the present invention, the dense Polytetrafluoroethylene granular powder having the excellent electric properties and the high bulk density can be obtained without using the organic liquid which is expensive and whose use is restricted.