High strength porous polytetrafluoroethylene product having a coarse microstructure
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United States of America Patent
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Jul 1, 1986
Issued Date -
N/A
app pub date -
Mar 27, 1984
filing date -
Sep 10, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Porous polytetrafluoroethylene materials having high strength and coarse microstructure are produced by densifying the materials after removal of lubricant and then stretching. The term, 'coarse,' is used to indicate that the nodes are larger, the fibrils are longer, and the effective pore size is larger than conventional materials of the same matrix tensile strength. Densification can be achieved through the use of such devices as a densification die, a calender machine, or a press. This invention can be used to produce all kinds of shaped articles.
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