Polyamic acid solution composition and polyimide film made therefrom.

摘要

Disclosed is an aromatic polyamic acid solution composition comprising an aromatic polyamic acid dissolved in an amount of 5 to 40% by weight in an organic polar solvent. The aromatic polyamic acid is prepared by polymerizing substantially equimolar amounts of an aromatic tetracarboxylic acid component comprising 15 to 85 mole% of a biphenyltetracarboxylic acid or its functional derivative and 15 to 85 mole% of a pyromellitic acid or its functional derivative and an aromatic diamine component comprising 30 to 100 mole% of a phenylenediamine and 0 to 70 mole% of a diaminodiphenyl ether. The aromatic polyamic acid solution composition is formed into an aromatic polyimide film having a relatively small thermal expansion coefficient, high mechanical strength and good flexibility.