POLYIMIDE PRECURSOR COMPOSITION, POLYIMIDE FILM, AND TRANSPARENT FLEXIBLE FILM

摘要

The polyimide precursor composition of the present invention is characterized in comprising a polyimide precursor having a structure formed by reacting a diamine component (A) containing a fluorine-containing aromatic diamine (a1) represented by the following chemical formula (I); ;(in the formula (I), R₁ and R₂ are each independently selected from —H, —(CF₂)_n—CF₃, and —O(CF₂)_n—CF₃ (n is an integer of 0 or more and 7 or less), and at least one of R₁ and R₂ is a fluorine-containing group) and trans-1,4-cyclohexyldiamine (a2) with an acid dianhydride component (B) containing an aliphatic tetracarboxylic dianhydride (b1) and an aromatic tetracarboxylic dianhydride (b2). Use of the composition of the present invention provides a polyimide film and a transparent flexible film having high transparency, low thermal expansion properties, low birefringent properties, and high heat resistance.