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, William B. Farnham, Andrew E. Feiring, Weiming Qiu
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Abstract
Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) dipolymers, and other copolymers containing TFE, HFP and a third monomer, many of 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.
Claims20
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 400.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 5 seconds to about 30 minutes.
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 400.degree. C., tetrafluoroethylene, hexafluoropropylene, a third monomer and a radical initiator, to produce an amorphous polymer which contains at least 15 mole percent of repeat units derived frown said hexafluoropropylene, at least 0-70 mole percent of repeat units derived from said tetrafluoroethylene, and 0-70 mole percent of repeat units derived from said third monomer, and provided that:
- said continuous polymerization has an average residence time of about 5 seconds to about 30 minutes;
- and said amorphous polymer contains at least one mole percent of repeat units derived from tetrafluoroethylene,.
Dependencies are inferred from the claim text.