| 摘要 |
An acid dianhydride, together with a diamine, is heated in an organic polar solvent in the presence of gamma-caprolactone or beta-butyrolactone as an acid catalyst to prepare a polyimide having an average molecular weight of 10,000 to 300,000. This production process can realize the production of a polyimide which is soluble in a solvent and has high processability and stability.
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