Patent ID: 7981996

Claim:
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 1 is a halogen atom, a nitro group, a C 1 - C 12 aliphatic radical, C 3 -C 12 cycloaliphatic radical, or a C 3 -C 12 aromatic radical; b is independently at each occurrence 0 or an integer from 1 to 3; and W is a bond, an oxygen atom, a sulfur atom, a sulfinyl group, a sulfonyl group, a selenium atom, a hexafluoroisopropylidene group, a C 1 - C 30 aliphatic radical, a C 3 -C 30 cycloaliphatic radical, or a C 3 - C 30 aromatic radical, or a carbonyl group.