| abstract |
ABSTRACT OF THE DISCLOSURE: There is disclosed a process for producing high-temperature resistant and flame-retardant paperlike materials based on polyimide polymers of the general formula which material has a weight per unit area of between 20 and 1,100 g/m2, a LOI-value of at least 32 % O2 and a TG point of at least 300°C. A pulp consisting of an aqueous suspension of polyimide fibers and, if desired, polyimide fibrids having structural units of the general formula (I) is processed on a paper machine to a nonwoven, which is wet-pressed and dried. The polyimide fibers are used in a disintegrated state, i.e., having fiber lengths of from 0.01 to 120 mm. Paperlike materials according to the invention having a weight per unit area of between 60 and 290 9/m2 are producible by contacting a manipulatable sheet-like structure of polyimide fibers with a polyimide solution, drying and, if desired, compacting the same. |