POLYIMIDE PRECURSOR COMPOSITION, POLYIMIDE FILM AND TRANSPARENT FLEXIBLE FILM

摘要

The polyimide precursor composition according to the invention, the formula (I) [Formula 1] Of the formula (I), R _1, R ₂ are mutually _{independently, -H, - (CF 2)} n -CF 3, -0 (CF 2) as one selected from the _n -CF _3, at least one dogs group containing a fluorine-containing diamine is an (n is an integer of 0 to 7).] the fluorine-containing aromatic diamine (a1) and the trans-1,4-cyclohexyl diamine (a2) represented by the following component (a ) and an aliphatic tetracarboxylic acid is characterized in that the acid comprises a dianhydride (b1) and the aromatic tetracarboxylic dianhydride (b2) contains a polyimide precursor having a structure formed by the reaction of the anhydride component (B). High by utilizing the composition of the invention in transparency, low thermal expansion, low birefringence, high heat resistance with excellent polyimide film and a transparent flexible film is provided.