Process for making fibres from poly(p-phenylene terephthalamide)
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United States of America Patent
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Mar 16, 1999
Grant Date -
N/A
app pub date -
Oct 27, 1997
filing date -
May 2, 1995
priority date (Note) -
In Force
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Abstract
The invention relates to an improvement of the known process for spinning poly(p-phenylene terephthalamide) via an air gap spinning process. It comprises mixing poly(p-phenylene terephthalamide) with concentrated sulphuric acid by a freezing process, heating the solid mixture, and passing the resulting solution to the spinning orifices under pressure. It involves the use of a mixing kneader to convert the solid mixture into a spinning solution.
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