| abstract |
A polyester fiber made of a copolyester satisfying the following requirements (a) to (c): the proportions of terephthalic acid and 2,6-naphthalene- dicarboxylic acid to the whole dicarboxylic acid component are 0 to 100 mole % and 100 to 0 mole % respectively , the proportions of trimethylene glycol and 1,4-cyclo- hexanedimethanol to the whole glycol component are 0 to 100 mole % and 100 to 0 mole % respectively, and the total content of 2,6-naphthalenedicarboxylic acid and 1,4-cyclohexanedimethanol is 2 mole % or above. |