| abstract |
(57) [Summary] [Structure] A polyester obtained by copolymerizing a hydrophilic compound, which contains a polar group-containing compound and / or a cross-linking agent and is excellent in hygroscopicity, and a synthetic fiber using the same. [Effect] Since the copolyester of the present invention has a high hygroscopicity, it can be used as a comfortable material for underwear, sportswear, lining, etc. as a woven or knitted fabric or the like made of a composite fiber as a constituent. |