Wholly aromatic mesomorphic polyester imides, the preparation and use thereof

Abstract

Wholly aromatic mesomorphic polyester imides which form a liquid-crystalline fiber-forming melt below 320.degree. C. and are composed of (a) from 5 to 35 mol % of repeat units of the formulae I and/or II ##STR1## where x can be identical or different and each is --O--, --S--, --SO.sub.2 --, --CO--, --CH.sub.2 -- or .dbd.C(CH.sub.3).sub.2, and n is 1 or 2, (b) from 0 to 30 mol % of repeat units of the formulae III and/or IV ##STR2## (c) a molar amount corresponding to the total amount of components (a) and (b) of repeat units (c1) from 3 to 35 mol % of units of the formula V ##STR3## and one or more of the repeat units. 2 (c2) from 2 to 25 mol % of units of the formula VI ##STR4## (c3) from 0 to 25 mol % of units of the formula VII ##STR5## (c4) from 2 to 25 mol % of units of the formula VIII ##STR6## the total of the molar proportions of components (c1), (c2), (c3) and (c4) corresponding in each case to the total in mol % of components (a) and (b), (d) if desired from 5 to 25 mol % of repeat units of the formula IX ##STR7## (e) repeat units of the formula X ##STR8## the molar proportions of (a), (b), (c), (d) and (e) in each case adding up to 100 mol %, the preparation thereof and fibers, films and molding prepared therefrom.

Dependencies are inferred from the claim text.