Polyurethane having excellent elastic recovery and elastic filament of the same

摘要

A polyurethane having excellent elastic recovery is obtained by reacting an organic diisocyanate with a polycaprolactone polyester-diol prepared from a dihydric alcohol, a dibasic acid, an ester thereof or an anhydride thereof and epsilon -caprolactone or/and hydroxycaproic acid and having a hydroxyl value of 35 to 150 KOH mg/g and a content of epsilon -caprolactone and hydroxycaproic acid of 69 to 95% by weight.