| abstract |
{PROBLEMS} Polyurethane elastic yarn having high strength and ductility pursued in polyurethane elastic yarn, and also having excellent durability and heat resistance, and having little fatigue at low temperature; And providing a method for producing the same. The solution is prepared from polyurethanes having polymeric diols and diisocyanates as starting materials, wherein the polyurethanes have a ratio of 1,2-bonded butadiene structures to 1,4-linked butadiene structures in the molecule of 91: 9. Polyurethane elastic yarn comprising a polyurethane A containing a polybutadiene structure in the range of 20 to 20:80. |