Process for preparing polytetrafluoroethylene powder

Details Process for preparing polytetrafluoroethylene powder Process for preparing polytetrafluoroethylene powder

1991-05-06

1992-06-02

Schofer, Joseph L.

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

Synthetic resins

Treating polymer containing material or treating a solid...

526255, C08F 600

Patent

active

051187884

ABSTRACT:
Polytetrafluoroethylene powder having an average particle size of 1 to 30 .mu.m and a specific surface area of 2 to 6 m.sup.2 /g is prepared by heating unsintered polytetrafluoroethylene powder having a melting point of 313.degree. to 330.degree. C. at a temperature in a range from a temperature 70.degree. C. lower than the melting point to a temperature lower than the melting point and comminuting the heated powder.

REFERENCES:
patent: 2847711 (1958-08-01), Hibbard
patent: 4675380 (1987-06-01), Buckmaster et al.
patent: 4714756 (1987-12-01), Buckmaster
Chemical Abstracts, vol. 78, No. 16, Apr. 23, 1973, p. 33, Abstr. No. 98466q.
Database WPI, Accession No. 73-075104, Derwent Publications Ltd., London, GB & SU-A-3427 779.

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