Patent ID: 8960271
Filing Date: 2015-02-24
Classification: C08L,H01B

Abstract:
1. In a downhole well wherein the temperature is 290° C. or greater, a communications cable positioned within said well, at least a portion of said cable thereby being exposed to said temperature, said cable including as a component thereof a composition consisting essentially of 65 to 85 wt % melt-fabricable tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, said perfluoroalkyl containing 1 to 5 carbon atoms, and 15 to 35 wt % melt flowable polytetrafluoroethylene, to total 100 wt % based on the combined weight of said tetrafluoroethvIene/perfluoro(alkyl vinyl ether) copolymer and said polytetrafluoroethylene, wherein the melt flow rate of said tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer and the melt flow rate of said polytetrafluoroethylene are within the range of 20 g/10 min from each other, said polytetrafluoroethylene by itself having no tensile strength, said composition of said component retaining at least 90% of its tensile modulus after said exposure to said temperature for a time period of at least 1 week.