| 摘要 |
High modulus shaped articles such as fibers and films, composed of a wholly aromatic copolyamide, are provided. The wholly aromatic copolyamide is comprised of recurring units of the formulae: -NH-AR1-NH-CO-Ar2-CO-(A) and -NH-Ar3-CO-(B) wherein Ar1, Ar2 and Ar3 independently stand for divalent groups selected from <IMAGE> (a) <IMAGE> (b) <IMAGE> (c) <IMAGE> in which X's independently stand for a group selected from halogeno, alkyl, aralkyl, aromatic, alkoxy, acetyl and cyano, n is 1 to 3 and Y is selected from <IMAGE> in which R' stands for an 1-5C alkyl group, and the copolymerization ratio expressed by the molar ratio of the total of Ar1, Ar2 and Ar3 fails within the square hatched region in a triangular coordinate of FIG. 1, and said copolyamide has an intrinsic viscosity of at least 1.5. The shaped articles are prepared by a process wherein a solution comprised of the above-defined wholly aromatic copolyamide, a halide of a metal of Group I or II of the Periodic Table and an amide type organic solvent is subjected to wet or dry shaping; and then, the shaped article is stretched at a stretch ratio of at least 1.5 at an elevated temperature. |
