TETRAFLUOROETHYLENE/PERFLUORO (ALKYL VINYL ETHER) COPOLYMER

摘要

Purpose: To provide a melt-moldable tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer with excellent durability without causing an excessive decrease of the melt flow rate and an increase of the perfluoro(alkyl vinyl ether) content. Solution means: A melt-moldable tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, which is characterized in that in a parallel plate mode of a dynamic viscoelasticity measuring device, when the temperature is raised from -40°C to 200°C at 5°C/min while fixing the measuring frequency to 1 Hz, the slope (”tan ´/”T) of the loss tangent (tan ´) measured between two arbitrary points in a range of 50-75°C and at a temperature difference of 3°C or higher is always in a range of 0.0005-0.0030, and its preparation method.