| abstract |
(57) [Summary] [Object] To provide a method for producing a multilayer polyimide film that can be laminated with a metal foil under mild conditions. [Structure] 3,3 ', 4, by multilayer extrusion method On one or both sides of a base polyamic solution containing 4'-biphenyltetracarboxylic dianhydride and paraphenylenediamine as essential components, 2,3,3 ', 4'-biphenyltetracarboxylic dianhydride and 1,3- A multi-layer extruded polyimide film is produced by laminating, drying and imidizing a solution of a polyimide mainly obtained from bis (4-aminiphenoxy) benzenediamine or a precursor thereof. |