Polyimide based purge media and methods relating thereto
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United States of America Patent
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Nov 13, 2012
Grant Date -
Jan 5, 2012
app pub date -
Dec 21, 2010
filing date -
Dec 22, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is disclosed for the manufacture of a powdered polyimide extrudate for use as a purge media. The method includes feeding a polyimide film material into an extruder having a first zone that provides heating and a subsequent second zone that provides endothermic shearing. In one embodiment, the resulting purge media comprises a sheared polyimide powder having an average particle size in a range of about 5 to 100 microns (or any sub-range thereof). The purge media can comprises up to 35 weight percent other additives.
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