Benzenamine, 4,4'-[1,3-phenylenebis(oxy)]bis- → 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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In 11.81 kg of N-methyl-2-pyrrolidone were dissolved 0.949 kg (3.25 mols) of 1,3-bis(4-aminophenoxy)benzene, 0.936 kg (2.92 mols) of 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl, and 0.081 kg (0.33 mol) of bis(aminopropyl)tetramethyldisiloxane (the sum of the diamine components: 6.5 mols ) as diamines, and 0.956 kg (3.25 mols) of diphathalic acid dianhydride and 1,443 kg (3.25 mols) of 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dihydride (the sum of the tetracarboxylic acid dianhydride components: 6.50 mols) as tetracarboxylic acid dianhydrides. The resulting solution was stirred at room temperature for 24 hours. The temperature of the solution was raised to 75° C. When the viscosity reached 5,000 c.p., heating was stopped, and the solution was allowed to stand to cool it to room temperature. 0.696 kg (1.93 mols) of an N-methyl compound was added to the solution, and a solution of a photosensitive polyimide resin precursor was prepared.

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