A hygroscopic polyester copolymer and a hygroscopic fiber containing it

摘要

A hygroscopic polyester copolymer contains copolymerized units derived from (1) a hydrophilic compound and (2) a cross-linking agent and has a release parameter DELTA MR of at least 12% so as to be controlled in its moisture absorbing and releasing property. Fibers containing the polyester copolymer may be formed and these may be utilized in materials for underwear, sports wear, interlinings, etc. as highly hygroscopic woven and knitted fabrics, etc.