| 摘要 |
<p>The present invention discloses a polyester fiber having a birefringence of 0.025 or more, comprising at least 90% by weight of a poly (trimethylene terephthalate), on which a finishing agent composed essentially of (1) an aliphatic hydrocarbon ester having a molecular weight of 300 to 800 and/or a mineral oil having a Redwood viscosity at 30 DEG C of 40 to 500 seconds, (2) a polyether having a structure containing an ethylene oxide unit and a propylene oxide unit, (3) a nonionic surfactant, and (4) an ionic surfactant in a specific proportion is applied. With an application of the specific finishing agent, processability during various steps from the spinning step to the processing step, for example, processability during the spinning and drawing steps, unwinding step from yarn package, false-twist texturing, weaving, and knitting processings are drastically improved, thus obtaining a poly (trimethylene terephthalate having excellent smoothness, abrasion resistance, cohesiveness and an anti-static electricity property.</p> |
