Patent ID: 6423407
Filing Date: 2002-07-23
Classification: D01F,Y10T

Abstract:
A polytrimethylene terephthalate fiber composed of a polytrimethylene terephthalate comprising not less than 95 mole % of a polytrimethylene terephthalate repeating unit and not more than 5 mole % of the other ester repeating unit and having an intrinsic viscosity of from 0.7 to 1.3, wherein the fiber satisfies the following features (1) to (6):(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 (Â°C.) of dynamic loss tangent from 102 to 116Â° 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, and (6) a fiber to fiber dynamic frictional coefficient of from 0.30 to 0.50.