| 摘要 |
PROBLEM TO BE SOLVED: To provide a spandex filament excellent in elasticity recovery, strength, hydrolysis resistance and thermostability, a polyurethane given therefor, and further a polyester diol used therefor. SOLUTION: This spandex filament is composed of the polyurethane obtained from a lactone polyester diol, containing a specific alicyclic ether,ε-caprolactone and a dibasic acid, as at least a constitutional component unit, and an organic diisocyanate. |
