| abstract |
(57) [Summary] [Structure] A polyurethane fiber comprising a polyurethane composed of a polyester diol component, an organic diisocyanate component and a chain extender component, wherein 30 mol% or more of the dicarboxylic acid units constituting the polyester diol is 3,8-Dimethyldecanedioic acid unit and / or 3,7- A polyurethane fiber comprising a dimethyldecanedioic acid unit and a polyesterdiol having a number average molecular weight of 500 to 6000. [Effect] The polyurethane fiber of the present invention is excellent in heat resistance, hot water resistance, cold resistance and hydrolysis resistance, and is capable of high temperature and high pressure dyeing. |