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.

主权项

1. A polyimide precursor composition comprising a polyimide precursor having a structure formed by reacting (i) a diamine component (A), including a fluorine-containing aromatic diamine (a1) represented by the following chemical formula (I),wherein in the formula (I), R1 and R2 are each independently selected from —H, —(CF2)n—CF3, and —O(CF2)n—CF3, wherein 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 (ii) an acid dianhydride component (B) including an aliphatic tetracarboxylic dianhydride (b1) and an aromatic tetracarboxylic dianhydride (b2), and
wherein the diamine component (A) includes the trans-1,4-cyclohexyldiamine (a2) in an amount of 50 mol % or more and 95 mol % or less, and wherein the aliphatic tetracarboxylic dianhydride (b1) is 3,3′,4,4′-bicyclohexyl tetracarboxylic dianhydride, and the aromatic tetracarboxylic acid dianhydride (b2) is 3,3′,4,4′-biphenyltetracarboxylic dianhydride.