| abstract |
(57) [Problem] To provide an elastic yarn having low hysteresis and excellent durability. SOLUTION: The breaking elongation is 300% or more, and the breaking strength is 0.5 g / Denier or more, (length after repeating 300% elongation 5 times) / (Original length) = 1.10 to 1.25, the rate of decrease in tension after holding 300% elongation for 30 seconds is 15% to 30%, and the degree of yellowing after irradiation of 7 ppm NO2 gas and carbon arc for 50 hours Elastic yarn characterized by being 10 or less as measured by a color master. |