High-strength polyester-amide fiber and process for producing the same
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United States of America Patent
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Issued Date -
Feb 13, 2003
app pub date -
Aug 6, 2002
filing date -
Feb 5, 2001
priority date (Note) -
Abandoned
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Abstract
A high-strength polyesteramide fiber comprising a polyesteramide copolymer is characterized by having a primary peak temperature that is at least 10.degree. C. higher than that of a non-oriented material comprising the polyesteramide copolymer, as measured by dynamic viscoelastometry. A high-strength polyesteramide fiber production process is characterized by comprising a series of steps of melt spinning the polyesteramide copolymer, immediately followed by solidification by cooling in an inert cooling medium having a temperature of 20.degree. C. or lower, thereby obtaining an undrawn filament; enhancing the crystallinity of the undrawn filament to 10 to 30% by weight; and subjecting the undrawn filament having a crystallinity of 10 to 30% by weight to a single- or multi-stage drawing in such a way as to give a total draw ratio of 4.5 times or greater.
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