Method of converting fluorine-containing polymer into lower mole

Details Method of converting fluorine-containing polymer into lower mole Method of converting fluorine-containing polymer into lower mole

1987-12-02

1990-03-13

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5253264, 528481, C08F 850

Patent

active

049084151

ABSTRACT:
A fluoropolymer, e.g. polytetrafluoroethylene, is easily and efficiently converted into a lower molecular weight polymer in the form of a fine powder by subjecting the fluoropolymer to contact reaction with a gas comprising molecular fluorine or a suitable fluoride such as nitrogen trifluoride or xenon difluoride at a temperature between the melting temperature of the fluoropolymer and 600.degree. C., extracting a hot reaction gas produced by the contact reaction from the reactor and cooling the extracted reaction gas to a temperature not high than 100.degree. C. to thereby precipitate the molecular weight reduced fluoropolymer contained in the hot reaction gas as vapor.

REFERENCES:
patent: 3067262 (1962-12-01), Brady
patent: 4071479 (1978-01-01), Broyde et al.
patent: 4711949 (1987-12-01), Aramaki et al.

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