3,6-di(3',5'-bis(trifluoromethyl)benzene)pyromellitic dianhydride, and process for preparing them

摘要

The present invention relates to fluorine-containing 3,6-di(3',5'-bis(trifluoromethyl)benzene)pyromellitic dianhydride as a monomer which can be used in preparing polyimides with high glass transition temperature, low dielectric constant and excellent processability, and preparing method thereof.