| abstract |
Kind Code: A1 A polyimide precursor that provides a polyimide useful as a base material for a flexible film liquid crystal display having a good balance of properties such as high transparency, high glass transition temperature, low birefringence, and high toughness, and a method for producing these polyimides. Provided is a 3,3 ′, 4,4′-diphenylsulfonetetracarboxylic dianhydride and a general formula (1) [Wherein, R 1 represents hydrogen or a linear or branched alkyl group having 1 to 4 carbon atoms. ] General formula (2) obtained from a trans-1,4-diaminocyclohexane compound represented by formula (2) [Wherein, R 1 has the same meaning as in general formula (1). ] And a polyimide obtained from the polyimide precursor and having a reduced viscosity of 0.5 dL / g or more. |