General Electric Company

Sabic Innovative Plastics IP B.v.

Philip L Angermeier

Roy Ray Odle

Robert Russell Gallucci

Thomas Link Guggenheim

Robert Edgar Colborn

John Morgan Whitney

Albert Santo Stella

Paul Edward Howson

Tara Jane Mullen

A process for preparing polyimide resins comprises stirring a diamine and a dianhydride in a solvent to form a slurry; heating the slurry to a temperature sufficient for the diamine and dianhydride to react wherein the temperature is below the melting point of the dianhydride, below the melting point of the diamine, or below the melting points of the dianhydride and diamine; and reacting the diamine and dianhydride to form a polyimide having sufficient molecular weight to precipitate from the solvent.

Precipitative process to prepare polyimides

A process for the formation of halophthalic anhydrides and halogen substituted-n-alkyl-phthalimides from the corresponding substituted-n-alkyl-tetrahydrophthalimide by passing said substituted-n-alkyl-tetrahydrophthalimide over a metal catalyst, in the gaseous phase in the presence of oxygen. By selection of the reaction temperature and reaction time, high conversions and purity of the anhydride or imide can be selectively obtained.

Preparation of substituted phthalic anhydrides and substituted phthalimides

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Mount Vernon, IN, United States of America

Philip L Angermeier