Hedman, Casella, Gibson, Costigan
Polyetherimide resin and electrical conductors insulated therewith
 Novel high molecular weight resins, useful for electrically insulating conductors, are prepared by polycondensation of a dianhydride, or a mixture of two or more dianhydrides, and a diisocyanate in an inert organic solvent, preferably in the presence of a catalytic amount of 2-methylimidazole. 
General Electric Company
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Y10T H01B H01B C08G C08G C08G Y10T Y10T C08G C08L
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Yue-Guey L.
Lee