| 摘要 |
PURPOSE:The titled polyester fibers, having the cooling crystallization peak temperature, peak half-width value thereof, birefringence, residual elongation and intrinsic viscosity present within respective specific ranges and suitable for high-speed warping, knitting and weaving. CONSTITUTION:Polyester fibers obtained by specifying the cooling crystallization peak temperature measured by a differential scanning calorimeter at >=195 deg.C, preferably >=200 deg.C, half-width value thereof at <=10 deg.C, preferably <=7 deg.C, birefringence at 0.09-0.130, preferably 0.09-0.120, residual elongation at 40-60% and intrinsic viscosity at 0.50-0.635, preferably 0.50-0.61. The above- mentioned fibers are produced by a method for adding a phosphonic acid compound in an amount of 0.01-1.0mol% based on an acid component constituting the polyester, spinning the resultant blend at a high speed of >=5,000m/min, etc. A high strength is attained while sustaining a high elongation.
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