| abstract |
(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide an impact-absorbing polyester fiber capable of reducing damage received by an impact load generated when absorbing impact energy at the time of dropping or collision, and having good breaking strength. thing. SOLUTION: The polyester is composed of ethylene terephthalate as a main repeating unit and has a strength of 5.0 g / d. Above, elongation is 25-50%, initial modulus is 40-9 0 g / d, the first yield strength is 0.7 to 1.2 g / d, And a shock absorbing polyester fiber having a 10% elongation strength of 1.0 to 1.7 g / d. |