| 摘要 |
PURPOSE: A producing method of a multilayer polyimide film, and the multilayer polyimide film are provided to prevent damage to a thermoplastic polyimide film by un-dried residues on an internal layer. CONSTITUTION: A producing method of a multilayer polyimide film comprises the following steps: supplying more than two kinds of polyimide resin solutions or polyimide precursor resinous solutions to a multilayer co-extrusion die(7) through plural flow paths; and expanding and compliably multilayer extruded materials discharged from the multilayer co-extrusion die. The polyimide resin solutions or polyimide precursor resinous solutions contain an imide functional group or an imide precursor functional group.
|
