Title:
EETERUKETSUGOSHITA ARIIRUTETORAKARUBONSANNIMUSUIBUTSUNO HORIIMIDONO SEIHO
Document Type and Number:
Japanese Patent JPS5133190
Kind Code:
A
Abstract:
1472724 Polyimide NATIONAL AERONAUTICS & SPACE ADMINISTRATION 11 July 1975 [11 July 1974] 29187/75 Heading C3R A polyimide comprises repeating units wherein Rf is -(CF 2 ) n - or n is 2 to 10; m is 1 to 10; x and y are each 0 to 3; and x+y=0 to 5. They may be prepared conventionally by reacting the appropriate dianhydride and diamine (the preparations of which are described), optionally together with a trifunctional branching agent, e.g. 2 to 20 equivalent per cent of mellitic trianhydride, but the initial reaction stage to form the polyamide-acid intermediate proceeds more slowly than with conventional polyimides. The polyimide is stated to have suitable properties for use as fuel tank sealants in aerospace structures.
More Like This:
| JPS57167324 | CURABLE RESIN COMPOSITION |
Inventors:
JEIMUZU ARUBAATO UEBUSUTAA
Application Number:
JP8459475A
Publication Date:
March 22, 1976
Filing Date:
July 11, 1975
Export Citation:
Assignee:
NASA
International Classes:
C08G73/00; C08G73/10; C07D209/48; (IPC1-7): C07C63/32; C07C91/44; C08G73/10