NOVEL POLYAMIDEIMIDE HAVING LOW THERMAL EXPANSION COEFFICIENT

摘要

The present invention relates to a polyamideimide comprising an asymmetric dicarboxylic acid derivative wherein, from among a cyclic group A and a cyclic group B, two substitutents groups R and R' are bonded only to the cyclic group A on one side. A polymer produced by means of the present invention can have adequate solubility with respect to organic solvents, high thermal stability, a high glass transition temperature, high transparency and a low thermal expansion coefficient, and is able not only to satisfy requirements for core substrate materials of flexible displays but also to be used as a material for various soft electronic data devices.