Polytrimethylene terephthalate fiber
US6423407B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2001 |
| Grant date | Jul 23, 2002 |
| Priority date | — |
| Expiry date | Apr 13, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2969
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A polytrimethylene terephthalate fiber composed of a polytrimethylene terephthalate (PTT) comprising not less than 95 mole % of a polytrimethylene terephthalate repeating unit and having an intrinsic viscosity of from 0.7 to 1.3, wherein the fiber satisfies the following features:(1) a degree of crystalline orientation of from 88% to 95%,(2) a peak value of dynamic loss tangent (tan &dgr;) max of from 0.10 to 0.15,(3) a peak temperature Tmax (°C.) of dynamic loss tangent 102 to 116° C.,(4) an elongation at break of from 36 to 50%,(5) a peak value of thermal stress being between 0.25 and 0.38 g/d,(6) a fiber to fiber dynamic frictional coefficient of from 0.30 to 0.50; andthe PTT fiber having an excellent processability can be obtained through a drawing process in which the undrawn yarn can be stably drawn.The PTT fiber can be produced by melt-spinning PTT having an intrinsic viscosity of 0.7-1.3 at a withdrawal speed of 2,000 m/min or less to obtain a undrawn yarn, and then drawing and heat-treating the undrawn yarn by means of draw-twister.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.