As a dibasic acid component, terephthalate acid is used, as a diol component, having ethyleneglicol used, while as the second diol element, 2,2'-bis[4-(2-hydroxy-2-alkylethoxy)phenyl propane is employed to produce a copolymer polyester resin. These elements are compounded to obtain a slurry, which is spun at the highest speed, 5000, by the spin draw method, 6500m/min to produce a polyester fiber with differant dyeability.
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