Polytetrafluoroethylene and method for producing same
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United States of America Patent
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Nov 28, 2023
Grant Date -
Feb 2, 2012
app pub date -
Mar 30, 2010
filing date -
Mar 30, 2009
priority date (Note) -
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Abstract
It is an object of the present invention to provide polytetrafluoroethylene suitable for forming a porous polytetrafluoroethylene film using a high water-soluble surfactant with high volatility. Polytetrafluoroethylene has non-melt-secondary-processability, standard specific gravity of 2.160 or less, an average primary particle size of 150 nm or more, stress relaxation time of 500 seconds or more, and break strength of 29.7 N or more. The polytetrafluoroethylene is obtainable by emulsion polymerization of tetrafluoroethylene in the presence of a fluorinated surfactant with Log POW of 3.4 or less.
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