Tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer
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United States of America Patent
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Apr 18, 2017
Grant Date -
Jul 9, 2015
app pub date -
Jun 20, 2013
filing date -
Jun 22, 2012
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Abstract
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 (Δ tan δ/ΔT) of the loss tangent (tan δ) 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.
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