Patent · US Expired

Low-melting tetrafluoroethylene copolymer and its uses

US5464904A · kind A · utility

42Cited by

5References

6Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

George R. Chapman, Jr. · Boothwyn, US
Lewis E. Crenshaw · Wilmington, US
Rita S. McMinn · Newark, US
Richard A. Morgan · Vienna, US
Donnan E. Priester · Wilmington, US
Charles W. Stewart · Newark, US
Robert E. Tarney · Hockessin, US

Key dates

Filing date	Nov 16, 1994
Grant date	Nov 7, 1995
Priority date	—
Expiry date	Nov 16, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L27/20
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Copolymers of tetrafluoroethylene (TFE) and hexafluoropropylene (HFP) having high HFP content and end-of-melting temperature, T.sub.m (end), as low as 200.degree. C. are disclosed. Exceptional performance as a processing aid in polyolefins results from having T.sub.m (end) of the TFE/HFP copolymer close to the processing temperature of the polyolefin. These TFE/HFP copolymers are soluble in fluorinated cyclic solvents. Copolymer/solvent systems copolymer at significant concentrations in selected solvents are fluid and stable at room temperature.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.