| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyamide-based elastic fiber capable of being produced by a melt spinning, and capable of providing a woven or knitted fabric having good elastic characteristics and dimensional stability. SOLUTION: This polyamide-based elastic fiber is composed of a polyamide elastomer having a hard segment derived from a polyamide, and a soft segment derived from a poly(alkylene oxide)glycol and/or poly(alkylene oxide)diamine, having 500-4,000 number average molecular weight, and produced by carrying out a chain extension of both segment by a 4-10C dicarboxylic acid, and containing 5-40 wt.% hard segment. The polyamide-based elastic fiber has >=90% elastic recovery after 100% elongation, <=4×10<-2> cN/dtex shrinking stress in dry heat, 1×10<-2> -5×10<-2> cN/dtex recovery stress at 60% elongation and <=60% hysteresis loss.
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