General Electric Company

Howard M Relles

Donald S Johnson

Frank J Williams, Iii

Polyetherimides are provided which are based on the self-condensation in a dipolar aprotic solvent of a hydroxyaryl phthalimide salt having a nuclear bound leaving radical on the phthalimide ring. The polyetherimides are injection-moldable high performance thermoplastics.

Polyetherimides prepared by self-condensation of hydroxyaryl phthalimide

A liquid extraction method is provided for recovering aromatic bisimides from an organic solvent aromatic bisimide reaction mixture having a variety of reaction by-products. An organic solvent solution of the bisimide reaction mixture is extracted with water and/or an aqueous alkali metal hydroxide to effect removal of such reaction by-products, and provide an organic solvent phase of the aromatic bisimide which can be obtained in substantially pure form upon removal of the organic solvent.

Liquid extraction method for recovering aromatic bisimides

There are provided aromatic polyformal-polycarbonate block polymers and method for making such materials. The polyformal-polycarbonate block polymers can be made by phosgenating a mixture of a bisphenol and oligomeric aromatic polyformal having terminal phenolic groups. The aromatic block polymers are high performance thermoplastics having improved hydrolytic stability compared to aromatic polycarbonates and improved heat distortion temperature compared to conventional aromatic polyformal.

Aromatic polyformal-polycarbonate block polymers and method for making

Aromatic bisimides can be prepared by effecting reaction under anhydrous conditions between a 3- or 4-nitro-N-substituted phthalimide with an aromatic dihydroxy compound in the presence of a certain class of dipolar aprotic compounds as solvent and solid potassium carbonate and in the further presence of a particulate zeolite adsorbent.

Preparation of aromatic bisimides

Aromatic tetracarboxylic acids can be prepared by effecting reaction between a 4-nitro-N-alkylphthalimide with an aromatic dihydroxy compound in the presence of potassium carbonate as a catalyst and using dimethyl sulfoxide as a solvent.

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Rexford, NY, United States of America

Howard M Relles