Production of polyimide foams

Details Production of polyimide foams Production of polyimide foams

C - Chemistry, Metallurgy

08

G

403/58

C08G 73/10 (2006.01) C08J 9/00 (2006.01) C08J 9/36 (2006.01)

Patent

CA 2006949

PRODUCTION OF POLYIMIDE FOAMS Abstract of the Disclosure A polyimide precursor mixture having a solids con- tent of 50 to 77 (preferably 65 to 75) weight percent is subjected to a multistaged thermal treatment in which the precursor is heated to one or more temperatures sufficient to obtain a consolidated but friable cellular foam struc- ture, and the resultant cellular foam structure is then subjected to one or more higher temperatures sufficient to cure the cellular material into a resilient polyimide foam. There is no need for use of time-consuming and expensive spray drying and microwave radiation apparatus.

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