LINEAR POLYIMIDE PRECURSOR HAVING ASYMMETRIC STRUCTURE, POLYIMIDE, AND THEIR PRODUCTION METHODS

摘要

A linear polyimide precursor includes a repeating unit represented by at least one formula selected from the group consisting of General Formula (1) and General Formula (2), the linear polyimide precursor having an intrinsic viscosity of 0.5 dL/g or more.
In General Formulas (1) and (2), X is a divalent aromatic group or a divalent aliphatic group excluding residues of 1,4-bis(4-aminophenoxy)benzene and bis(4-amino-3-methylphenyl)methane. The linear polyimide precursor has good solubility and thermoplasticity together with high glass transition temperature and toughness. Therefore, it is suitably used as a raw material of an asymmetric polyimide that is useful, for example, as a resin used for a flexible printed circuit (FPC) adhesive.