Coagulable polymer solution having dissolved therein aromatic high-performance polymers, a process for their production and their use

The invention relates to a wet and dry-in-wet-coagulatable, especially spinnable polymer solution based on ionic liquids and containing dissolved therein aromatic high-performance polymers in the form of aromatic polyamides, aromatic polyamideimides, aromatic polyimide and / or polybenzimidazole, with the ionic liquid were extracted from pollutant-containing textile fiber materials, especially textile fiber waste, wherein the polymer solution contains 0.5 to 30 wt .-% of high performance polymers, and more than 0.01 wt .-%, in particular 0.01 to 3 wt .-% pollutants and in particular contains a zero viscosity of from 1.5 to 30,000 Pa · s. Furthermore, the invention relates to a method for producing such a polymer solution and its advantageous use for the manufacture of fibers by wet or dry-wet spinning and for the production of films, coatings membrane by wet or dry-wet coagulation. The advantage of the products obtained in this process is that the content of toxic pollutants is greatly reduced to a negligible level, and in particular less than 20 ppm, especially less than 5 ppm.