| 摘要 |
PCT No. PCT/JP90/01272 Sec. 371 Date May 30, 1991 Sec. 102(e) Date May 30, 1991 PCT Filed Oct. 2, 1990 PCT Pub. No. WO91/05088 PCT Pub. Date Apr. 18, 1991.A composite elastic filament yarn having excellent heat resistance is produced by conducting conjugate-spinning, in a core-sheath arrangement, preferably a concentric core-sheath arrangement, of a polyurethane, as a core component, which is crosslinked by a polyisocyanate at a crosslink density (Y) of 15 eta mol/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 polystyrene elastomer, under such conditions that the core to sheath conjugate 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 from tackiness and can be wound at a high speed. Further, the yarn is easy to unwind and its workability is excellent. This elastic yarn is suited for use in various fields, such as socks, tricots, panty hose, swimsuits and foundations.
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