| 摘要 |
A thermoplastic polyurethane composition comprises a thermoplastic polyurethane and a tin compound. The tin compound is contained in an amount of 0.3 to 15 ppm as converted into tin atom based on the thermoplastic polyurethane. The thermoplastic polyurethane composition has a retention ratio of long-chain hard segments when melt treated at 220.degree.C for 60 minutes of at least 85%. The thermoplastic polyurethane composition also has a retention ratio of inherent viscosity when melt treated at 220.degree.C for 6 minutes and then melt extruded and, thereafter, allowed to stand at 20.degree.C, 60% RH (relative humidity) for 24 hours of at least 85%. The thermoplastic polyurethane composition has excellent mold-ability and gives molded products being excellent in tensile strength and elongation, heat resistance, compression set, resistance to hydrolysis and like properties, and are hence useful as a raw material for various items. The thermoplastic polyurethane composition also has excellent spinnability and gives fibers having excellent hot water resistance, resistance to hydrolysis, unwindability and like properties, and are hence also useful as a material for elastic fibers.
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