| 摘要 |
PURPOSE:To enable the stable melt spinning of a blended polyurethane fiber, by setting the melt flow rate ratio of a thermoplastic polyurethane to polystyrene within a specific range, and carrying out the melt spinning under a specific spinning condition. CONSTITUTION:The ratio of the melt flow rate of (A) a thermoplastic polyurethane having a melt flow rate of 0.5-10 at 210 deg.C to (B) a polymer composed mainly of polystyrene and having a melt flow rate of 1-5, is set between 0.5 and 10. The melt spinning of the mixture is carried out under the spinning condition to give the ratio of the melt viscosity of the polyurethane before spinning (eta0A) to that of the polyurethane after spinning (etaA) of within 0.7-1.0. The lowering of the elastic property of the fiber can be prevented by this process.
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