POLYIMIDE PRECURSOR, POLYIMIDE, AND MATERIALS TO BE USED IN PRODUCING SAME

摘要

Disclosed is a novel copolyimide precursor for producing a highly transparent polyimide. This copolyimide precursor comprises unit structures represented by general formula (A1) and unit structures represented by general formula (A2). In general formula (A1), R1 is a hydrogen atom or a C1-4 alkyl group; and R2 and R3 are each independently a hydrogen atom, a C1-6 alkyl group, or a C3-9 alkylsilyl group, while in general formula (A2), R4 is a hydrogen atom or a C1-4 alkyl group; R5 and R6 are each independently a hydrogen atom, a C1-6 alkyl group, or a C3-9 alkylsilyl group; and X is a tetravalent group except the groups represented by formulae (A3).