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US 4,391,967 AGranted
Polyimides-polyamides from tricyclo [4.2.1.0.sup.2,5 ] nonane-3,4-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride and dicarboxylic acids
AssigneeStandard Oil Company (Indiana)
InventorsTayseer S. Nimry, Ellis K. Fields
Life of this patent
Estimating the term…
Abstract
This invention relates to novel polyimides-polyamides and copolyimides-polyamides prepared from the novel nonaromatic dianhydrides or mixtures of these with other dianhydrides. Tricyclo [4.2.1.0.sup.2,5 ] nonane-3,4-dimethyl-3,4,7,8-tetracarboxylic acid dianhydride (I). I is used to prepare novel polyimides-polyamides which are useful in preparing molded articles, fibers, laminates and coatings.
Claims8
A polyimide-polyamide comprising the following recurring structure:
- ##STR7## wherein R' is the same or different divalent aliphatic, cycloaliphatic, araliphatic or aromatic hydrocarbon radicals the term "R has the same meaning as R' or is an aromatic hydrocarbon having from about 6 to about 10 carbon atoms joined directly or by a stable linkage selected from the group consisting of --O--, methylene, ##STR8## --SO--, --SO.sub.2 -- or --S-- radicals".
Dependencies are inferred from the claim text.