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US 4,358,562 AGranted
Copolyimides from tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride and a mixture of diamines
AssigneeStandard Oil Company (Indiana)
InventorsEdward E. Paschke, Tayseer S. Nimry, Ellis K. Fields
Life of this patent
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Abstract
Novel copolyimides and molding compositions are prepared from tetramethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride and mixtures of diamines. Also glass and graphite filled polyimides are prepared. The polyimides are useful as engineering plastics.
Claims31
A copolyimide of the following recurring structure ##STR3## wherein R and R' are different divalent aliphatic or aromatic hydrocarbon radicals.
Dependencies are inferred from the claim text.