High vinyl ether modified sinterable polytetrafluoroethylene

Details High vinyl ether modified sinterable polytetrafluoroethylene High vinyl ether modified sinterable polytetrafluoroethylene

2005-03-22

2005-03-22

Wu, David W. (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S250000, C428S402000, C264S117000

Reexamination Certificate

active

06870020

ABSTRACT:
Modified polytetrafluoroethylene powder of a sinterable copolymer of tetrafluoroethylene containing about 0.5 to about 10 weight % of fluorinated vinyl ether, the copolymer having a melt creep viscosity of greater than about 1×106Pa·S. In preferred embodiments, the sinterable copolymer has a melt creep viscosity of greater than about 1×107Pa·S and fluorinated vinyl ether content of from about 1 to about 7 weight %. The polymer has a combination of a high level of fluorinated vinyl ether and a melt creep viscosity which is high enough to enable the fabrication of articles by sintering.

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Modern Fluoropolymers, Chapter 12 “Modified Polytetrafluoroethylene—the Second Generation” by Klaus Hintzer and Gemot Lohr, edited by John Scheirs, (c) 1997 John Wiley & Sons, Ltd., pp. 248-249.

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