Wholly aromatic mesomorphic polyester amide imides and the preparation thereof

A wholly aromatic mesomorphic polyester amide imide which forms a liquid-crystalline fiber-forming melt below 320.degree. C., composed of

• (a) from 5 to 35 mole % of repeat units of the formula I or II or mixtures thereof ##STR19## where the Xs in the formulae I and II are identical or different and each is --O--, --S--, --SO.sub.2 --, --CO--, --CH.sub.2 -- or --C(CH.sub.3).sub.2 and n is 0 or 1,
• (b) from 0 to 30 mole % of repeat units of the formulae III or IV or mixtures thereof ##STR20## (c) a molar amount corresponding to the total amount of components a and b of repeat units of the formulae V, VI, VII or IX or mixtures thereof, with the stipulation that a molar quantity greater than zero of V, VI or mixtures thereof must be present at all times ##STR21## ##STR22## from 5 to 25 mole % of repeat units of the formula X, XI or XII or mixtures thereof:
• ##STR23## (e) repeat units of the formula XIII ##STR24## the mole percentages of components (a), (b), (c), (d) and (e) adding up to 100 mole % in each case.