Monoaxially stretched shaped article of polytetrafluoroethylene and process for producing the same
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United States of America Patent
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Dec 1, 1992
Grant Date -
N/A
app pub date -
Mar 26, 1990
filing date -
Apr 6, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To produce a monoaxially stretched shaped article of polytetrafluoroethylene (PTFE), a pasty mass containing PTFE powder is continuously shaped to a shaped body, which is fed over a plurality of rollers or rolls, heated and stretched. The shaped body is heated to a temperature of between 327.degree. and 450.degree. C. prior to stretching strain, it is sintered simultaneously and is then stretched. This process allows for the production of a monoaxially stretched shaped article of PTFE which has strength values in the stretching direction of at least 500 N/mm.sup.2 and a delivery of between 1.80 and 2.30 g/cm.sup.3.
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