Process of making partially oriented poly(trimethylene terephthalate) yarn
View Patent ↗A stable partially oriented poly(trimethylene terephthalate) yarn suitable for use in subsequent drawing and/or draw-texturing operations characterized by an elongation to break of at least 110%, and a process for false-twist texturing a partially oriented poly(trimethylene terephthalate) yarn.
1. A process for spinning a stable partially oriented yarn, comprising extruding a polyester polymer through a spinneret at a spinning speed less than 2600 mpm and a temperature between about 250° C. and 270° C., wherein said polymer comprises at least 85 mole % poly(trimethylene terephthalate) wherein at least 85 mole % of repeating units consist of trimethylene units, wherein said polymer has an intrinsic viscosity of at least 0.70 dL/g, and wherein said stable partially oriented yarn has an elongation to break of from 110 to 137.1%.
2. The process of claim 1 , wherein the spinning speed is between 1650 mpm and 2300 mpm.
3. The process of claim 1 , wherein said stable partially oriented yarn has an elongation to break of at least 120%.
4. The process of claim 1 , wherein said stable partially oriented yarn has an elongation to break of at least 130%.
5. The process of claim 1 , wherein said stable partially oriented yarn has an intrinsic viscosity of at least 0.90 dL/g.
6. The process of claim 1 , wherein said stable partially oriented yarn has an intrinsic viscosity of at least 1.0 dL/g.
7. The process of claim 2 , wherein said stable partially oriented yarn has an intrinsic viscosity of at least 0.90 dL/g.
8. The process of claim 3 , wherein said spinning speed is between 1650 and 2300 mpm.
9. The process of claim 4 , wherein said spinning speed is between 1650 and 2300 mpm.
10. The process of claim 5 , wherein said spinning speed is between 1650 and 2300 mpm.
11. The process of claim 6 , wherein said spinning speed is between 1650 and 2300 mpm.
12. The process of claim 7 , wherein said spinning speed is between 1650 and 2300 mpm.