Acetic Anhydride → 5,5'-Carbonyldi(2-benzofuran-1,3-dione)--1-(4-aminophenyl)-1,3,3-trimethyl-2,3-dihydro-1H-inden-5-amine (1/1)

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A 300 ml flask fitted with a thermometer, a stirrer, a condenser, and a nitrogen inlet tube was charged with 2.71 g (0.045 mols) of 1,12-diaminododecane, 5.77 g (0.01 mols) of a polyetherdiamine (ED2000 (a product name), manufactured by BASF Corporation, molecular weight: 1,923), 3.35 g (0.045 mols) of 1,3-bis(3-aminopropyl)tetramethyldisiloxane (LP-7100 (a product name), manufactured by Shin-Etsu Chemical Co., Ltd.), 15.62 g (0.1 mols) of 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) that had been purified in advance by recrystallization from acetic anhydride (and exhibited a difference between the endothermic start temperature and the endothermic peak temperature as determined by DSC of 2.5° C.), and 113 g of N-methyl-2-pyrrolidone, and the resulting reaction liquid was then heated to 180° C. under constant stirring while nitrogen gas was blown through the system, thereby allowing the reaction to progress. The water generated within the reaction liquid was then removed, yielding a solution of a polyimide resin (PI-C). Measurement of the polyimide resin by GPC revealed polystyrene equivalent values of Mn=22,600 and Mw=121,400.

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