Process for modifying aliphatic polyamides with polyurea
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United States of America Patent
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Nov 2, 1999
Grant Date -
N/A
app pub date -
Apr 30, 1998
filing date -
Oct 16, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The end groups of an aliphatic polyamide may be changed by reacting a polyurea with a molten aliphatic polyamide at temperatures of about 260.degree. C. or more. Carboxyl end groups are controllably converted to amine end groups. This is especially useful for controlling the dyeability of fibers spun from such aliphatic polyamides.
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