| abstract |
A polyester fiber having a superior stainproof property comprises at least one fiber-forming polyester copolymer comprising a backbone polyester polymer and at least one type of terminal substituent which blocks at least some of the terminals of the molecules of the backbone polyester polymer and which substituent consists of a polyoxyalkyleneglycol monoether group of the formula (I): R1-O-R2-On (I) wherein R1 is a monovalent organic radical free from active hydrogen atom, R2 is an alkylene radical, and _n is an integer of 2 or more. |