| 摘要 |
<p>A composite elastic yarn having excellent heat resistance produced by performing composite spinnning, in a core-sheath arrangement, preferably a concentric core-sheath arrangement, of a polyurethane, as a core component, crosslinked by a polyisocyanate at a crosslinking density (Y) of 15 νmol/g or more to thereby have improved heat resistance and a non-polyurethane thermoplastic elastomer, as a sheath component, particularly a polyester elastomer, a polyamide elastomer or a polystyrene elastomer, under such conditions that the core to sheath composite ratio (X) is in the range of from 3/1 to 100/1, and that the relationship of Y » - X + 35 is satisfied. This elastic yarn is free of stickiness and can be wound at a high speed. Farther, the yarn is easy to unravel and its workability is excellent. This elastic yarn is suited for use in various fields, such as sock, tricot, panty stocking, swimsuit and foundation.</p> |
