| abstract |
(57) [Summary] [Purpose] While exhibiting excellent bathochromic properties and vividness, To provide a polyester fiber having good friction durability and a method for producing the same. [Structure] A polyester fiber containing 0.1 to 10% by weight of a polyoxyalkylene glycol derivative having both ends blocked by the following general formula is weight-reduced with an aqueous solution of an alkali compound to form fine pores on the fiber surface. . Z [-O- (AO) m- X] 2 (In the formula, Z is selected from the group consisting of an aliphatic diol having 5 to 10 carbon atoms, an alicyclic diol having 3 to 15 carbon atoms, a bisphenol and a dihydric phenol. A divalent hydroxy group-containing compound residue, A is an alkylene group having 2 to 4 carbon atoms, m is a positive integer, and X is a monovalent hydroxy group-containing compound residue.) |