To provide a polyester fiber having improved abrasion resistance which is a problem in prior arts, and most suitable for apparel use, especially for woven or knitted fabric to use a fine-denier fiber: and to provide a method for producing the polyester fiber.
The polyester fiber is produced by melt-spinning of a polyester containing ethylene terephthalate as a main repeating unit and satisfies the following requirements (1) to (5). (1) The fineness is ≥8 dtex and ≤100 dtex; (2) the single fiber fineness is ≥1 dtex and ≤4 dtex; (3) the breaking strength is ≥4 cN/dtex; (4) the breaking elongation is ≥20% and ≤50%; and (5) the minimum differential Young's modulus is ≤20 cN/dtex in an elongation range of ≥2% and ≤5% on a stress-strain curve of the fiber.
YAMASHITA AKIRA
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Takashi Ishida
Tetsuji Koga
Kazuhiro Nakamura
Hiroyuki Onoda
Toko Saito