Process for preparing tetrafluoroethylene copolymers with other

Details Process for preparing tetrafluoroethylene copolymers with other Process for preparing tetrafluoroethylene copolymers with other

1996-01-22

1997-04-08

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526247, C08F 238

Patent

active

056188978

ABSTRACT:
The invention relates to a process for obtaining copolymers of tetrafluoroethylene with one or more perfluorinated monomers having ethylenic unsaturation, said copolymers having only carboxylic or carboxylate groups as unstable end groups, by polymerization in aqueous emulsion in the presence of a dispersing agent. The process is characterized in that CHF.sub.2 --CH.sub.3 is used as chain transfer agent, and an inorganic peroxidic compound is used as initiator. The carboxylic or carboxylate groups are successively transformed into stable groups of the --CF.sub.2 H type by known stabilizing treatments.

REFERENCES:
patent: 3085083 (1963-04-01), Schreyer
patent: 4743658 (1988-05-01), Imbalzano et al.
patent: 4864006 (1989-09-01), Giannetti et al.
patent: 5115038 (1992-05-01), Ihara et al.
patent: 5180803 (1993-01-01), Gibbard

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