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US 5,212,283 AGranted
Polyimides containing the cyclobutene-3, 4-dione moiety
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorTerry L. St. Clair
Life of this patent
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Abstract
Linear aromatic polyimides containing the cyclobutene-3,4-dione moiety were produced by reacting 1,2-bis(4-aminoanilino)cyclobutene-3,4-dione with several aromatic dianhydrides. The resulting polymers exhibited glass transition temperatures greater than 500.degree. C., adhered tenaciously to glass, and became more flexible after heating for 1 hour at 300.degree. C.
Claims10
A polymide having the following general structural formula:
- ##STR3## where n=10-100;
- Ar is any aromatic moiety;
- and R.sub.1 and R.sub.2 each is a hydrogen or a lower alkyl group.
Dependencies are inferred from the claim text.