| abstract |
The present invention discloses a novel polyimide copolymer precursor used for obtaining a polyimide with high transparency. This polyimide copolymer precursor comprises unit structures represented by general formula (A1) below, and unit structures represented by general formula (A2) below. [In formula A1, R1 represents a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, and each of R2 and R3 independently represents a hydrogen atom, an alkyl group of 1 to 6 carbon atoms, or an alkylsilyl group of 3 to 9 carbon atoms. ] [In formula A2, R4 represents a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, each of R5 and R6 independently represents a hydrogen atom, an alkyl group of 1 to 6 carbon atoms, or an alkylsilyl group of 3 to 9 carbon atoms, and X represents a tetravalent group other than those represented by general formula (A3) below. |