| abstract |
The high-strength copolymer aramid fiber of the present invention is composed of an aramid copolymer containing an aromatic group substituted with a cyano group (—CN), and has a cord modulus of 700 to 1,100 g / d. . The high-strength copolymer aramid fiber of the present invention has an orientation degree of 10 to 25 ° and an excellent strength of 20 to 35 g / d. In the present invention, when the radiation dope passes through the spinneret, the shear rate at the inner wall of the spinneret is appropriately adjusted, or the aramid yarn passing through the coagulation tube is stretched simultaneously with coagulation, etc. And has a higher cord modulus and strength than conventional aramid fibers, thereby being useful as various industrial materials. [Selection] Figure 1 |