| 摘要 |
PURPOSE:Easily dyeable polyester fibers, having specific relationships between the crystallinity and birefringence and dynamic loss tangent and temperature, and dyeable in deep colors under boiling conditions and ordinary pressure. CONSTITUTION:Copolyester fibers, consisting of 80-98% ethylene terephthalate in repeating units, and having the relationship between the crystallinity (Xc) and birefringence (DELTAn) thereof satisfying formula I and a temperature (Tmax) at which the dynamic loss tangent (tandelta) shows the maximum at 110Hz measuring frequency within the range of formula II and the maximum of tandelta (tandelta)max within the range of formula III. For example, a copolyester is melt spun at >=5,000m/ min winding speed, passed through a heating zone kept at 150-300 deg.C for >=5cm length from the undersurface of a spinneret, and collected with a collecting guide provided in a zone at <=5cm below the point of completing the thinning of monofilaments under <=0.4g/denier tension at a position 5cm below the guide.
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