Method for producing omni-meta aromatic polysulfonamide fiber
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United States of America Patent
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Issued Date -
Oct 2, 2008
app pub date -
Nov 13, 2007
filing date -
Mar 26, 2007
priority date (Note) -
Abandoned
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Abstract
The invention relates to a method of preparing omni-meta aromatic polysulfonamide fiber which comprises three steps of preparing spinning dope, wet spinning and post treating. The said step of preparing spinning dope comprises the following steps: (1) dissolving 3,3'-diaminodiphenyl sulphone in a polar organic solvent and cooling it to -20.about.20.degree. C.; (2) adding m-phthaloyl chloride of the same mole of the 3,3'-diaminodiphenyl sulphone to carry out a polymerization reaction; (3) then adding an inorganic base of the same mole of 3,3'-diaminodiphenyl sulphone to neutralize the hydrogen chloride produced during the polymerization reaction. The spinning dope thus prepared has a polymer solid content of 10%-20%. The fiber prepared according to the method in the present invention has a greatly improved crimpability, and evidently increased elongation at break comparing with the conventional aromatic polysulfonamide fiber, so that the spinnability of resultant yarn is improved.
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