| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a polyester undrawn fiber (partially oriented fiber), by which the polyester undrawn fiber having a desired hue, has reduced quality irregularity, and has a degree of molecular orientation represented by a birefringence of 0.03 to 0.06. SOLUTION: This method for producing the polyester undrawn fiber having a birefringence of 0.03 to 0.06 is characterized by melting a polyethylene terephthalate-based polyester synthesized using titanium trimellitate and a specific phosphonate compound so that the phosphorus (P)/titanium (Ti) content ratio in the polyester is in the range of 2 to 15, and then cooling/solidifying and simultaneously taking up the spun fiber at a speed of 2,500 to 4,000m/min. COPYRIGHT: (C)2004,JPO
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