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TETRAFLUOROETHYLENE POLYMER AND AQUEOUS DISPERSION THEREOF

  • US 20090281231A1
  • Filed: 04/13/2007
  • Published: 11/12/2009
  • Est. Priority Date: 04/13/2006
  • Status: Active Grant
First Claim
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1. A tetrafluoroethylene polymer having stretchability and non-melt-processability and having a standard specific gravity of 2.140 to 2.165,wherein, with regard to the heat-of-fusion curve obtained by subjecting the tetrafluoroethylene polymer in the form of an unbaked polymer to be measured having no history of being heated to a temperature of 300°

  • C. or higher to differential scanning calorimetry at a programming rate of 2°

    C./minute,the ratio between the amount of heat, S2 mJ/mg, absorbed within the temperature range of from the temperature T0°

    C., which is lower by 2.5°

    C. than the temperature Tp°

    C. corresponding to the minimum point on the curve (provided that 340≦

    Tp

    345), up to 350°

    C., and the amount of heat, S1 mJ/mg, absorbed within the temperature range of from 320°

    C. up to the above-mentioned T0°

    C., namely the ratio [S2/S1], is not lower than 0.90.

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