| 摘要 |
A process for producing 2,3,3',4'-biphenyltetracarboxylic dianhydride (a-BPDA), comprising dehydrating 2,3,3',4'-biphenyltetracarboxylic acid in an inert gas atmosphere under heating at 180 to 195° C is disclosed. This process produces high-purity a-BPDA which is suitable for production of a polyimide.
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