POLYAMIDE ACID, POLYAMIDE ACID SOLUTION, POLYIMIDE, POLYIMIDE FILM, LAMINATE, FLEXIBLE DEVICE, AND METHOD OF MANUFACTURING POLYIMIDE FILM

摘要

The polyamide acid according to the present invention contains 2,2-bistrifluoromethyl benzidine and trans-1,4-cyclohexane diamine as diamine components, and pyromellitic anhydride and 3,3,4,4-biphenyltetracarboxylic dianhydride as tetracarboxylic dianhydride components. The proportion of trans-1,4-cyclohexane diamine to the total diamine content is preferably 0.5–40 mol%. The polyimide is obtained through dehydration ring closure of the polyamide acid.