Aromatic co-polyamide for use in fibres and films

摘要

An aromatic copolyamide contains repeating units of formulae (I), (II) -(OC-Ar<2>-CO-NH-Ar<3>-NH)- (II) and -(OC-Ar<4>-CO-NH-Ar<5>-NH)- (III). Ar<1>, Ar<2>, Ar<3>, Ar<4> = divalent aromatic gps. with their valency bonds in p-position or in a coaxial or parallel position comparable to this; Ar<5> = divalent aromatic gp., different from Ar<3>, with valency bonds in p-position or in a comparable coaxial or parallel position to each other, or is a divalent aromatic gp. with valency bonds in m-position to each other or in a comparably angled position; Y = -O-, -S- or -NR<1>-; R<1> = monovalent organic gp., or esp. H; the Ar gps. may be substituted with 1 or 2 gps. inert to carboxylic acid chlorides.