| 摘要 |
<p>A synthetic fiber which is excellent in moisture-absorbing/releasing property and exhibits high elongation and high recovery percentage of elongation, characterized in that it has moisture absorption ratios of 0.5 to 4.0 wt % and 4.5 wt % or more under conditions of 20 °C X 65 %RH and 30 °C X 90%RH, respectively, and also has a difference between the absorption ratios under the two conditions of 4.0 wt % or more. The representative examples of such fibers include polyurethane synthetic fiber and polyether synthetic fiber. The synthetic fiber maintains a high tensile strength at break of an elastomer fiber component thereof also in the state of having absorbed moisture, is excellent in color fastness to rubbing, and can be used for manufacturing a stretch fiber fabric product excellent in comfortableness through blending with another fiber material. The synthetic fiber can be produced by incorporating a water-absorbing resin having a water absorbing ratio of 500 to 4,000 wt % into an elastomer fiber such as a polyurethane fiber and a polyurethaneurea fiber in a finely dispersed state in an amount of 1 to 15 wt % relative to a fiber-forming polymer.</p> |
