| 摘要 |
PURPOSE: A polyimide film is provided to apply the polyimide film for an optical member requiring the low birefringence and the high permeability, by securing the optical property. CONSTITUTION: A polyimide film is obtained by imidizing polyamic acid. The polyamic acid is obtained by reacting a di-anhydride class containing at least 10mol% of 1,1'bicyclohexane-3,4,3,4-tetracarboxylic dianhydride and diamines. The polyimide film has the birefringence less than 0.01, and the glass transition temperature less than 250 deg C.
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