Method for spinning and reeling polyester multifilament yarns by using spinning additives, and polyester multifilament yarns obtained by said spinning method
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United States of America Patent
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Issued Date -
Dec 8, 2005
app pub date -
Jul 12, 2005
filing date -
Mar 28, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a process for producing and winding partially oriented polyester multifilament yarns not less than 85% by weight based on the total weight of the multifilament yarn polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT) that contain between 0.05% by weight and 2.5% by weight based on the total weight of the multifilament yarn of at least one additive polymer extensibility enhancer, which comprises providing a wound yarn package which is stable in long-term storage and insensitive to elevated temperatures during storage and transportation by heat-treating the wound polyester multifilament yarn package at a temperature in the range from >45.degree. C. to 65.degree. C. The present invention further relates to the polyester multifilament yarns obtainable by the process and to their use.
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