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AssigneeE. I. Du Pont de Nemours and Company
InventorsGeorge R. Chapman, Jr., Lewis E. Crenshaw, Rita S. McMinn, Richard A. Morgan, Donnan E. Priester, Charles W. Stewart, Robert E. Tarney
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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.
A polymer blend composition having improved processibility, comprising a polyolefin and an effective amount, to improve processibility, of a partially-crystalline fluoropolymer containing no more than 2 wt % hydrogen, having a melt viscosity from about 0.1.times.10.sup.3 to 20.times.10.sup.3 Pa.s, and having the end of crystalline melting, T.sub.m (end), in the range from about 170.degree. C. to about 265.degree. C.
Dependencies are inferred from the claim text.