| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester fiber having excellent color developing properties in dyeing after postprocessing, antistatic properties, hygroscopicity, contact running friction, opacity and process passableness during yarn texturing. SOLUTION: This polyester fiber comprises a water-soluble compound having >=1,000 P melt shear viscosity at 295 deg.C and 1,000 [1/s] shear rate and has >=0.015 birefringence.
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