High melt flow fluoropolymer
View Patent ↗The present invention relates to a partially-crystalline copolymer comprising tetrafluoroethylene, hexafluoropropylene in an amount corresponding to hexafluoropropylene index (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 having less than about 50 ppm alkali metal ion, 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/10 6 carbon atoms and which can be extruded at high speed onto conductor over a broad polymer melt temperature range to give insulated wire of high quality.
1. 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 having less than about 50 ppm alkali metal ion, having a melt flow rate of within the range of about 30±3 g/10 min as determined by ASTM D1238 at 372° C., and having no more than about 50 unstable endgroups/10 6 carbon atoms.
2. The polymer of claim 1 wherein said copolymer has less than about 25 ppm alkali metal ion.
3. The polymer of claim 1 wherein said copolymer has less than about 10 ppm alkali metal ion.
4. The polymer of claim 1 wherein said copolymer has less than about 5 ppm alkali metal ion.
5. The polymer of claim 1 wherein said alkali metal ion is potassium.
6. The polymer of claim 1 having a melt flow rate of within the range of about 28 to 32 g/10 min as determined by ASTM D1238 at 372 ° C.
7. The polymer of claim 1 having no more than about 20 unstable endgroups/10 6 carbon atoms.