Patent ID: 7981996
Filing Date: 2011-07-19
Classification: C07D

Abstract:
1. A method for making a bisimide, the method comprising: (a) adding a molten first reactant to a mixture comprising a solvent having a boiling point greater than 120° degrees Celsius at 1 atmosphere and a second reactant to provide a uniform reaction mixture wherein said first reactant is an anhydride and said second reactant is a diaminodiphenylsulfone; (b) agitating the uniform reaction mixture while removing water formed in an imidization reaction to afford a uniform product mixture comprising a product bisimide, the product bisimide being present in an amount corresponding to at least 20 percent solids, the product bisimide having a solubility in ortho-dichlorobenzene of less than about 10 percent by weight at a temperature of about 180° C.; said adding and said agitating being carried out at a temperature of 210-230° C., wherein the dianhydride comprises a haloaromatic anhydride, a phthalic anhydride, a nitrophthalic anhydride, 4-cyanophthalic anhydride, or a dianhydride of structure (VI) wherein R