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US 4,065,345 AGranted
Polyimide adhesives
AssigneeThe United States of America as represented by the United States National Aeronautics and Space Administration
InventorsDonald J. Progar, Vernon L. Bell, Terry L. St. Clair
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Abstract
A process of preparing aromatic polyamide-acids for use as adhesives by reacting an aromatic dianhydride to an approximately equimolar amount of an aromatic diamine in a water or lower alkanol miscible ether solvent and wherein the polyamide-acids are converted to polyimides by heating to the temperature range of 200.degree. - 300.degree. C. and wherein the polyimides are thermally stable and insoluble in ethers and other organic solvents.
Claims6
A method for preparing an adhesive solution comprising:
- reacting an aromatic dianhydride with an approximately equimolar quantity of an aromatic diamine,
- the reactants being previously dissolved in a liquid selected from the group consisting of 1,2-dimethoxyethane, bis(2-methoxyethyl)ether, 1,2,bis(2-methoxyethoxy)ethane and bis-[2-(2-methoxyethoxy) ethyl]ether.
Dependencies are inferred from the claim text.