HIGH MELTING PTFE POLYMERS FOR MELT-PROCESSING

摘要

Provided are a tetrafluoroethylene copolymers having a melting point of at least 317° C., a melt flow index (MFI) at 372° C. and a 5 kg load (MFI 372/5) of from about 0.60 g/10 min up to about 15 g/10 min. Also provided are methods of forming a shaped article using the copolymers described above, shaped articles made with those copolymers and compositions containing such copolymers.

主权项

1. A tetrafluoroethylene copolymer comprising repeating units derived from tetrafluoroethylene and from 0.12 to 1.40% by weight, based on the total weight of the copolymer, of units derived from a comonomer of the general formula:
CF2═CF—(CF2)n′—O—Rf′—O—(CF2)m—CF═CF2 wherein n′ and m represent, independently from each other, either 1 or 0; and Rf′ represents a linear, branched, cyclic or acyclic perfluorinated alkylene unit that may contain one or more ether oxygen atoms and that has up to 8 carbon atoms;
further wherein the copolymer has a melting point of at least 317° C., a melt flow index at 372° C. and a 5 kg load of from about 0.60 g/10 min up to about 15 g/10 min.