Preparation of bisphenol-A bisimides
AssigneeGeneral Electric Company
InventorsDonald S. Johnson, Frank J. Williams, III
Life of this patent
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Abstract
A process for purifying a bisphenol-A bisimide which comprises treating the latter with a polar solvent selected from the class consisting of methanol, acetonitrile, acetone, and diethyl ether.
Claims1
The process for purifying a 4-isomer bisimide of the formula ##STR7## which contains as impurities, at least one of an imide compound selected from the class consisting of ##STR8## which process comprises dissolving at a temperature from 20.degree. to 100.degree. C. the aforementioned 4-isomer bisimide in methanol, for a period of time sufficient to take up in said solvent these impurities, and separating the purified 4-isomer bisimide substantially free of the impurities.
Dependencies are inferred from the claim text.