AROMATIC POLYAMIC ACID AND POLYIMIDE

摘要

An aromatic polyimide which is excellent in heat resistance and dimensional stability to heat and has low hygroscopicity; and an aromatic polyamic acid which is an intermediate for the polyimide. The aromatic polyamic acid has a structural unit represented by the following general formula (1). The aromatic polyimide is obtained by imidizing this aromatic polyamic acid. The aromatic polyamic acid or aromatic polyimide can be in the form of a copolymer having other structural unit(s). (1) (In the formula, Ar1 is a tetravalent organic group derived from a tetracarboxylic acid having one or more aromatic rings; and R is a C2-6hydrocarbon.)