D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
28/1, 9/56
D21H 13/26 (2006.01) D21H 13/16 (2006.01) D21H 17/13 (2006.01)
Patent
CA 2003221
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 Image 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.
Loy Walter
Schobesberger Claus
Schobesberger Manfred
Vodiunig Robert
Weinrotter Klaus
Fetherstonhaugh & Co.
Lenzing Aktiengesellschaft
Loy Walter
Schobesberger Claus
Schobesberger Manfred
LandOfFree
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