POLYURETHANE FIBER AND STRETCH FABRIC HIGHLY RESISTANT TO ALKALI, AND METHOD FOR ALKALI REDUCTION TREATMENT OF STRETCH FABRIC

摘要

PROBLEM TO BE SOLVED: To obtain a stretch fabric slight in powderdown when subjected to alkali reduction treatment, and to provide a polyurethane fiber to be used in producing such a stretch fabric. SOLUTION: This stretchable fabric is obtained by using a polyurethane fiber >=80% in mechanical strength retention when treated at 130 deg.C for 60 min in an aqueous solution containing 50 g/L caustic soda.