Process for preparing polytetrafluoroethylene granular powder

Solid material comminution or disintegration – Processes – With solidifying – consolidating or shaping

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241 21, 264118, 264127, B02C 1900

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active

051563436

ABSTRACT:
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.degree. C. and less than 60.degree. 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.

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