Production of fibers or films using specific forming solutions and the fibers of films obtainable thereby

A process for producing fibers or films, comprising the following steps:

• a) preparing an aromatic polyamide by polycondensation of dicarbonyl dihalides or mixtures thereof with at least two diamines in N-alkyllactams as solvent, optionally in the presence of a salt for enhancing the solubility of the aromatic polyamide in said solvent, the polycondensation being of at least 90 mol%, based on the total amount of discarbonyl dihalides in the reaction mixture, of compounds of the formula I or mixtures of such compounds
• Hal--OC--Ar.sup.1 --CO--Hal (I)
• with at least 90 mol%, based on the total amount of diamines in the reaction mixture, of compounds of the formula I and optionally III or mixtures of such compounds
• H.sub.2 N--Ar.sup.2 --NH.sub.2 (II), H.sub.2 N--Ar.sup.3 --NH.sub.2 (III)
• where Ar.sup.1 and Ar.sup.2 are independently of each other a bivalent aromatic radical and Ar.sup.3 is a bivalent aromatic radical the proportion of structural repeat units in the aromatic polyamide derived from the compounds of the formula II, based on the proportion of the structural repeat units derived from the compounds of the formula II and III, being at least 50 mol%, and said aromatic polyamide is soluble in organic solvents,
• b) optionally storing the reaction solution obtained in step a) at temperatures from 40.degree. to 100.degree. C.,
• c) forcing the solution of the aromatic polyamide obtained in step a) and optionally stored as per step b) through dies of the desired cross-sectional shape at temperatures from 40.degree. to 120.degree. C. to form fibers or films,
• d) removing the organic solvent to produce solvent-leaner or -free fibers or films sufficiently mechanically stable and nontacky for further processing, and
• e) optionally drawing the resulting fibers or films and wherein a neutralization step is not carried out after the aromatic polyamide has been prepared.