Method for producing formed article from polyphosphoric acid solution
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United States of America Patent
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May 20, 2003
Grant Date -
Jul 5, 2001
app pub date -
Dec 12, 2000
filing date -
Dec 13, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a method for producing a formed article from a dope comprising a polyphosphoric acid solvent and a polymer soluble in polyphosphoric acid, which includes using a production apparatus containing an apparatus for stirring and uniformly dispersing or homogenizing a dope and a pump apparatus for delivering the uniformly dispersed or homogeneous dope, wherein at least one of the apparatus and the pump apparatus has a part that comes into contact with the dope. According to the present invention, maintenance frequency of production facility due to the corrosion and elution of metal in a recovered solvent can be reduced, which in turn decreases the production cost.
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