Method for producing polytetrafluoroethylene fine powder

Details Method for producing polytetrafluoroethylene fine powder Method for producing polytetrafluoroethylene fine powder

2011-07-05

2011-07-05

Boykin, Terressa M (Department: 1765)

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

Synthetic resins

Treating polymer containing material or treating a solid...

C523S201000, C524S502000, C528S326000

Reexamination Certificate

active

07973127

ABSTRACT:
The present invention provides a method for producing a polytetrafluoroethylene fine powder, which comprises emulsion polymerizing tetrafluoroethylene in the presence of an aqueous medium, a fluorinated surfactant and a radical polymerization initiator to produce an aqueous polytetrafluoroethylene emulsion, mixing and coagulating the aqueous emulsion to separate a polytetrafluoroethylene fine powder, and then drying the polytetrafluoroethylene fine powder in a wet state in an atmosphere containing ammonia.

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