High melt flow fluoropolymer
AssigneeE. I. Du Pont de Nemours and Company
InventorsThomas Robert Earnest, Jr., Daniel A. Favereau, Niall D. McKee, Patricia A. Tooley
Life of this patent
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Abstract
The present invention relates to a partially-crystalline copolymer comprising tetrafluoroethylene, hexafluoropropylene in an amount corresponding to HFPI of from about 2.8 to 5.3, and preferably from about 0.2% to 3% by weight of perfluoro(alkyl vinyl ether), said copolymer being polymerized and isolated in the absence of added alkali metal salts, having a melt flow rate of within the range of about 30±3 g/10 min, and having no more than about 50 unstable endgroups/106 carbon atoms can be extruded at high speed onto conductor over a broad polymer melt temperature range to give insulated wire of high quality.
Claims6
Cable for the transmission of data at a frequency of at least 10 GHz, comprising electrical conductor and insulation covering said conductor, said insulation comprising a partially-crystalline copolymer comprising tetrafluoroethylene, hexafluoropropylene in an amount corresponding to hexafluoropropylene index (HFPI) of from about 2.8 to 5.3, said copolymer being substantially free of alkali metal salt, having a melt flow rate of within the range of about 30±3 g/10 min, and having no more than about 50 unstable endgroups/106 carbon atoms, said copolymer exhibiting a dissipation factor at 10 GHz of no greater than 0.00025.
Process for transmitting data at a frequency of at least 10 GHz by a cable comprising an electrical conductor and insulation covering said conductor, comprising forming said insulation from a partially-crystalline copolymer comprising tetrafluoroethylene, hexafluoropropylene in an amount corresponding to hexafluoropropylene index (HFPI) of from about 2.8 to 5.3, said copolymer being substantially free of alkali metal salt, having a melt flow rate of within the range of about 30±3g/10 min, and having no more than about 50 unstable endgroups/106 carbon atoms having a dissipation factor of no greater than 0.00025 at 10 GHz.
Dependencies are inferred from the claim text.