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US 6,620,502 B1Granted
Polytrimethylene terephthalate fiber and process for producing the same
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsKatsuhiro Fujimoto, Jinichiro Kato
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AssigneeAsahi Kasei Kabushiki Kaisha
InventorsKatsuhiro Fujimoto, Jinichiro Kato
Estimating the term…
A polytrimethylene terephthalate fiber, a method for producing the same, a cheese-shaped package formed thereof, a false-twist textured yarn using the fiber and a fabric using the false-twist textured yarn are provided. The fiber is composed of 90 mol % or more of trimethylene terephthalate repeating units having a density in a range from 1.320 to 1.340 g/cm3, a birefringence in a range from 0.030 to 0.070, a peak value of thermal stress in a range from 0.01 to 0.12 cN/dtex, a boiling water shrinkage in a range from 3 to 40%, and an elongation at break in a range from 40 to 140%. The inventive polytrimethylene terephthalate fiber has both of proper crystallinity and orientation and is free from the package tightness due to yarn shrinkage and the bulge. The inventive fiber can be produced on an industrial scale.
A polytrimethylene terephthalate fiber composed of 90 mol % or more of trimethylene terephthalate repeating units and satisfying the following conditions defined in (A) to (E):
A method for producing a polytrimethylene terephthalate fiber by melt-spinning polytrimethylene terephthalate composed of 90 mol % or more of trimethylene terephthalate repeating units, wherein a melted multifilamentary yarn extruded from a spinneret is quickly cooled to be a solidified multifilamentary yarn which, after being heated to a temperature in a range from 50 to 170° C., is then wound on a bobbin at a winding tension in a range from 0.02 to 0.20 cN/dtex and a speed in a range from 2000 to 4000 m/min.
Dependencies are inferred from the claim text.