Patent ID: 8920922

Claim:
Polyurethane urea elastic fiber to provide fabrics suppressed in occurrence of curls and frays containing 60 wt % or more of a polyurethane urea polymer and 5 wt % to 40 wt % of a polyurethane compound, obtained by reacting a polyester diol or a polyether diol (excluding polyoxyethylene glycol), having a number average molecular weight of 500 to 2500, an isocyanate compound and a low molecular-weight polyol, wherein the polyurethane compound has no endothermic peak between 80° C. and a temperature at which decomposition of the polyurethane compound starts in differential scanning calorimetry (DSC), and a compression deformation initiation temperature according to thermomechanical analysis (TMA) of the polyurethane urea elastic fiber is not less than 150° C. and not more than 180° C. and the number of seconds up to thermal breakage at 180° C. is 30 seconds or more, wherein hardness of the polyurethane compound is 80 A or less.