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A process for making polyetherimides involving reacting an aromatic bis(ether anhydride) with an organic diamine in an inert solvent to form a prepolymer solvent mixture, effecting solvent removal by thin-film evaporation, and heating the resulting prepolymer to a temperature above the glass transit

A process for making polyetherimides involving reacting an aromatic bis(ether anhydride) with an organic diamine in an inert solvent to form a prepolymer solvent mixture, effecting solvent removal by thin-film evaporation, and heating the resulting prepolymer to a temperature above the glass transition temperature of the final polyetherimide product and less than 450°C. to form the polyetherimide.

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A process for making polyetherimide, which comprises: (a) reacting an aromatic bis(ether anhydride) of the formula [Figure] with an organic diamine of the formula H2N-R-NH2 in an inert solvent under polyetherimide-forming conditions, which include a reaction temperature of from about 40°C. to about

A process for making polyetherimide, which comprises: (a) reacting an aromatic bis(ether anhydride) of the formula [Figure] with an organic diamine of the formula H2N-R-NH2 in an inert solvent under polyetherimide-forming conditions, which include a reaction temperature of from about 40°C. to about 200°C., to form a prepolymer-solvent mixture; (b) forming a thin film of the prepolymer-solvent mixture under solvent-volatilizing conditions, which includes a temperature of from about 200°C. to about 450°C., to effect substantially complete removal of solvent and water of reaction from said mixture to form a prepolymer; and (c) heating the prepolymer to a temperature above the glass transition temperature of the final polyetherimide product and less than about 450°C. to form the polyetherimide; wherein, Z is a member selected from the class consisting of (A) divalent organic radicals having the following formulas [Figure] [Figure] [Figure] [Figure] [Figure] and (B) divalent organic radicals of the general formula [Figure] wherein X is a member selected from the group consisting of divalent radicals of the formulas [Figure] where y is an integer from 1 to about 5; and R is a divalent organic radical selected from the group consisting of aromatic hydrocarbon radicals having from 6 to about 20 carbon atoms and halogenated derivatives thereof, alkylene radicals having from 2 to about 20 carbon atoms, cycloalkylene radicals having from 3 to about 20 carbon atoms, from C2 to about C8 alkylene terminated polydiorganosiloxane, and divalent radicals of the general formula [Figure] where Q is a member selected from the class consisting of [Figure] and x is an integer from 1 to about 5.