Polyetherimides
AssigneeGeneral Electric Company
InventorTohru Takeoshi
Life of this patent
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Abstract
Polyetherimides are provided and a method for making such materials involving the reaction of organic diamines and 2,2',3,3'-tetracarboxydiphenyl ether dianhydride in the presence of an organic solvent. In instances where a phenolic solvent is employed, useful polyetherimide solutions can be made which can be employed in wire coating applications.
Claims5
Polyetherimides having the formula ##STR8## where R is a divalent organo radical selected from the class consisting of (a) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (b) alkylene radicals, C.sub.(2-8) alkylene terminated polydiorganosiloxane cycloalkylene radicals having from 2-20 carbon atoms, and (c) divalent radicals included by the formula, ##STR9## where Q is a member selected from the class consisting of --O--, ##STR10## --S--, --C.sub.x H.sub.2x -- and x is a whole number from 1 to 5 inclusive, m is 0 or 1 and n is an integer equal to from 2 to 2500 inclusive.
a wire coating formulation comprising a solution of a polyetherimide in a phenolic solvent, where the polyetherimide has the formula, ##STR13## where R is a divalent organo radical selected from the class consisting of (a) aromatic hydrocarbon radicals having from 6-20 carbon atoms and halogenated derivatives thereof, (b) alkylene radicals, C.sub.(2-8) alkylene terminated polydiorganosiloxane cycloalkylene radicals having from 2-20 carbon atoms, and (c) divalent radicals included by the formula, ##STR14## where Q is a member selected from the class consisting of --O--, ##STR15## --S--, --C.sub.x H.sub.2x -- and x is a whole number from 1 to 5 inclusive, m is 0 or 1 and n is an integer equal to from 2 to 2500 inclusive.
Dependencies are inferred from the claim text.