Process for preparing polytetrafluoroethylene granular power

Details Process for preparing polytetrafluoroethylene granular power Process for preparing polytetrafluoroethylene granular power

1991-04-30

1993-02-23

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528499, 528502, C08F 616

Patent

active

051891433

ABSTRACT:
A process for preparing a PTFE granular powder, which comprises agitating a PTFE powder having an average particle size of not more than 200 .mu.m in a two-phase liquid medium comprising water and at least one halogenated hydrocarbon selected from the group consisting of 1,1-dichloro-2,2,2-trifluoroethane, 1,1-dichloro-2,2,3,3,3-pentafluoropropane and 1,3-dichloro-1,1,2,2,3-pentafluoropropane. The PFTE powder may contain a hydrophilic filler surface-treated with an organosilane or a silicone resin. By using the particular halogenated hydrocarbon, the problemed environmental damage can be reduced, and loss of filler can be decreased.

REFERENCES:
patent: 3781258 (1973-12-01), Kometani et al.
patent: 3915916 (1975-10-01), Leverett
patent: 3929721 (1975-12-01), Leverett
patent: 4241137 (1989-12-01), Izumo et al.
patent: 4370436 (1983-01-01), Nakamura et al.

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