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Polyimide foamsCopolymide foams derived from a diester of 3,3',4,4'-benzophenonetetracarboxylic acid, an aromatic diamine, and a heterocyclic diamine. A molar concentration of the heterocyclic diamine approaching but not exceeding 0.42 is employed. This results in a flexible foam with a homogeneous cellular structure and a reduced compression set loss.
Document ID
20080007377
Acquisition Source
Johnson Space Center
Document Type
Other - Patent
Authors
Gagliani, John
Lee, Raymond
Sorathia, Usman A. K.
Date Acquired
August 24, 2013
Publication Date
June 1, 1982
Subject Category
Nonmetallic Materials
Report/Patent Number
Patent Number: US-PATENT-4,332,656
Patent Application Number: US-PATENT-APPL-SN-252902
Funding Number(s)
CONTRACT_GRANT: NAS9-15484
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,332,656
Patent Application
US-PATENT-APPL-SN-252902

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