Processes for making poly(trimethylene terephthalate) yarn
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United States of America Patent
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-
Feb 3, 2004
Grant Date -
Oct 25, 2001
app pub date -
Mar 1, 2001
filing date -
Mar 3, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Processes for making poly(trimethyelene terephthalate) yarn are provided. The process includes extruding a polyester polymer through a spinneret to form non-round filaments at a spinning speed less than 4500 mpm and a temperature between about 255.degree. C. and about 275.degree. C. The polyester polymer composition includes at least 85 mole percent poly(trimethylene terephthalate) wherein at least 85 mole percent of the repeating units consist of trimethylene units, and the polyester polymer has an intrinsic viscosity of at least 0.70 dl/g.
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