Tetracarboxylic dianhydride and preparation method thereof

The invention provides novel tetracarboxylic dianhydride and a preparation method thereof. According to an exemplary embodiment of the present invention, a novel tetracarboxylic dianhydride and a method for preparing the same can be provided. The novel tetracarboxylic dianhydride is suitable for providing a polyimide film. The polyimide film has high transparency and heat resistance and has excellent thermal dimensional stability because the stress of the substrate does not increase even when heat treatment is performed at a high temperature. 本发明提供了一种新型四羧酸二酐及其制备方法。根据本发明的示例性实施方案，可以提供一种新型四羧酸二酐及其制备方法，该新型四羧酸二酐适于提供一种聚酰亚胺膜，该聚酰亚胺膜具有高透明度和耐热性并且由于即使在高温下进行热处理基底的应力也不会增加而具有优异的热尺寸稳定性。