General Electric Company

Patrick E Gallagher

Ronald A Greenberg

James Anthony Cella

Gary Keith Shank

A process for making certain polyimides involves dissolving substantially equimolar amounts of an aromatic dianhydride and an organic diamine in a high-boiling, aprotic solvent, heating the reaction solution to form an insoluble polyimide prepolymer and to distill out water of reaction, separating the solid polyimide prepolymer and melt polymerizing the polyimide prepolymer to form the desired polyimide.

Process for preparing polyimides

Silicone-polyimides having improved flexibility can be obtained, by sequentially intercondensing organic diamine, aminoorgano terminated polydiorganosiloxane and aromatic bisanhydride. A decrease in flexural modulus and an increase in elongation percent is effected while flame retardance remains substantially unchanged.

Silicone-polyimides, and method for making

The present invention provides a process for the production of random copolymers containing repeating polyimide units and repeating polyetherimide units. The process is a reverse addition process and utilizes at least two dianhydrides of varying reactivity.

Process for the production of a random copolymer containing repeating

This invention is concerned with a new class of polyetherimide copolymers. More particularly, the invention is concerned with polyetherimide copolymers containing polyetherimide repeating units and repeating polyimide units. The polyetherimide compositions have improved solvent resistance and good heat properties.

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Pittsfield, MA, United States of America

Patrick E Gallagher