Polyamide acid, polyamide acid solution, polyimide, polyimide film, laminate and flexible device, and manufacturing method of polyimide film

摘要

The polyamide acid of the present invention is a heavy addition reaction of diamine and tetracarboxylic acid dianhydride, containing 2,2 '- bistrifluoromethylbenzidine as diamine component, and 3, 3', 4 as tetrasecarboxylic dianhydride component. 4 - biphenyl tetracarboxylic dianhydride and 9,9 - - (3,4 '- dicarboxylphenyl) fluorenous dianhydride.The amounts of 9,9 '- (3,4' - dicarboxylphenyl) fluorenolate to total tetracarboxylic acid anhydride are preferably 0.5 mol% or more and 10 mol% or less.