Tetrafluoroethylene polymer and aqueous dispersion thereof

Details Tetrafluoroethylene polymer and aqueous dispersion thereof Tetrafluoroethylene polymer and aqueous dispersion thereof

2007-04-13

2010-10-26

Eashoo, Mark (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C524S546000, C428S421000, C428S422000

Reexamination Certificate

active

07820775

ABSTRACT:
The invention provides a TFE polymer capable of providing stretched materials excellent in membrane homogeneity. The present invention is related to 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 S2/S1is not lower than 0.90.

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