Amorphous tetrafluoroethylene/hexafluoropropylene copolymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsColin Anolick, Viacheslav A. Petrov, Bruce E. Smart, Charles W. Stewart, Robert C. Wheland
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Abstract
Disclosed herein are novel amorphous tetrafluoroethylene/hexafluoropropylene (TFE/HFP) copolymers, which are more random than previous amorphous TFE/HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.
Claims12
A continuous polymerization process, comprising, contacting at a pressure of about 41 MPa to about 690 MPa, and a temperature of about 200.degree. C. to about 350.degree. C., tetrafluoroethylene, hexafluoropropylene, and a radical initiator, to produce an amorphous polymer which contains at least 30 mole percent of repeat units derived from said hexafluoropropylene, at least 1 mole percent of repeat units derived from said tetrafluoroethylene, and provided that said continuous polymerization has an average residence time of about 1 second to about 10 minutes.
Dependencies are inferred from the claim text.