MANUFACTURING METHOD OF POLYETHER ESTER FIBER BEING ADHERED MULTI-FUNCTIONAL CROSS-LINK AGENT TO SOFT SEGMENT AND HAVING EXCELLENT ELASTIC RECOVERY RATE

PURPOSE: A manufacturing method of polyether ester fiber having excellent elastic recovery rate is characterized by adhering a multi-functional cross-link agent to soft segments to extend distance between cross-link points and to slow an increase of melt viscosity and using much cross-link agent to equalize chemical cross-links in the soft segments. CONSTITUTION: Polyether ester fiber having excellent elastic recovery rate is obtained by the steps of: ether-exchanging a cross-link agent(formula I) having three functional groups for polytetra methylene glycol as soft segment to manufacture compound in advance; and then putting and copolymerizing 5-30wt.% of the compound into a polymerizing process of polyether ester block copolymer having polybutylene terephthalate type polyester as hard segment and polyoxy butylene terephthalate type polyether as the soft segment. In the formula I, R1, R2, and R3 are hydroxyl groups, carboxyl groups or -R4OH; and R4 is alkyl group having at least one of carbon number.