Process for producing aromatic polyimide filaments
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United States of America Patent
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-
Jan 25, 1983
Grant Date -
N/A
app pub date -
May 8, 1981
filing date -
May 9, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Aromatic polyimide fibers having an enhanced mechanical strength are produced by a process comprising the steps of: preparing a spinning dope solution of at least one aromatic polyimide having 90 molar % or more of a recurring unit of the formula (I): ##STR1## wherein R is a divalent aromatic radical, in a phenolic solvent; converting the dope solution into at least one filamentary stream thereof; solidifying the filamentary dope solution stream by removing the solvent therefrom to provide at least one undrawn filament, and; drawing the undrawn filament at a temperature of 20.degree. to 600.degree. C. at a draw ratio of 1.5 to 5.0.
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