| 摘要 |
<p>A high-strength polyester-amide fiber made of a polyester-amide copolymer, characterized in that in dynamic viscoelastometry the fiber has a main dispersion peak at a temperature higher by at least 10°C than the temperature of the main dispersion peak of a nonoriented object made of the polyester-amide copolymer; and a process for producing high-strength polyester-amide fibers which comprises a series of steps of spinning a melt of a polyester-amide copolymer and immediately solidifying the resultant filament by cooling in an inert cooling medium having a temperature of 20°C or lower to thereby obtain a noncrystalline unstretched yarn, heightening the crystallinity of the unstretched yarn to 10 to 30 wt.%, and stretching the resultant unstretched yarn having a crystallinity of 10 to 30 wt.% in one or more steps so as to result in an overall stretch ratio of 4.5 or higher.</p> |
