Process for preparing tetrafluoroethylene-ethylene copolymers

Details Process for preparing tetrafluoroethylene-ethylene copolymers Process for preparing tetrafluoroethylene-ethylene copolymers

1989-11-17

1991-08-06

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526212, 526250, C08F 216

Patent

active

050379143

ABSTRACT:
The present invention relates to a process for preparing copolymers of tetrafluoroethylene with ethylene, and optionally with a third monomer, of vinylic character.
The process is characterized in that tetrafluoroethylene is caused to react with ethylene and with the optional third, vinylic, monomer in an aqueous emulsion with the aid of a polymerization initiator of peroxy type, at a temperature within the range between 30.degree. and 95.degree. C. and under a pressure within the range of from 1.5 to 4.0 MPa, in the presence of tert.-butyl alcohol and of 1,1,2,2-tetrachloro-1,2-difluoroethane.

REFERENCES:
patent: 2479367 (1949-08-01), Joyce et al.
patent: 2490712 (1949-12-01), Schulze et al.
patent: 3313863 (1967-04-01), Schnell et al.
patent: 3462401 (1969-08-01), Kometami et al.
patent: 3637631 (1972-01-01), Sianesi et al.
patent: 3658742 (1972-04-01), Fish et al.
patent: 4426501 (1984-01-01), Khan
patent: 4555556 (1085-11-01), Beresniewicz

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