| 摘要 |
PROBLEM TO BE SOLVED: To provide: a melt-moldable tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer whose durability is excellent, without excessive reduction of a melt flow rate and increment in content of perfluoro(alkyl vinyl ether); and a production method of the same.SOLUTION: A melt-moldable tetrafluoroethylene/perfluoro (alkyl vinyl ether) copolymer is characterized in that a gradient (&Dgr;tanδ/&Dgr;T) of a loss tangent (tanδ) between given two points which are in a temperature range of 50°C-75°C and which have a temperature difference of at least 3°C is always in a range of 0.0005-0.0030 when being measured by a parallel plate mode of a dynamic viscoelasticity measurement apparatus, while measuring frequency is fixed at 1 Hz, and while a temperature is raised from -40°C to 200°C by 5°C/min, and a production method of the same is disclosed. |
