EXTRACTABLE COMPOSITE FIBER

摘要

The fiber, comprising easily-soluble extractive polyester and a insoluble fiber-forming polymer, particularly is prepared by: a process in which extractive polyester is reformed by adding B wt. % of polyalkylene glycol system having a number average molecular weight of more than 8,000 to the polyester, the main of which is ester unit of ethylene terephthalic acid and with which A mol % of metal sulfonate-content ester unit is copolymerized so as to satisfy the following formula (1) and (2) The extractive polyester has more than 50 times as high solubility as do the general polyesters.