Polyimide multilayer body and method for producing same

A method for producing a polyimide laminate by a coextrusion-casting method, the polyimide laminate having a layer of a highly heat-resistant polyimide and a layer of a thermoplastic polyimide on at least one side of the layer of the highly heat-resistant polyimide, the method comprising:

• coextruding a solution containing a precursor of the highly heat-resistant polyimide, and a solution containing a precursor of the thermoplastic polyimide in order to cast the solutions onto a supporter,
• the precursor of the highly heat-resistant polyimide and the precursor of the thermoplastic polyimide having a reactive functional group or reactive functional groups respectively, each of which is capable of forming a bond therebetween, each bond being independently at least one bond selected from the group consisting of an imide bond, an amide bond, and a benzimidazole bond.

A method for producing a polyimide laminate by a coextrusion-casting method, the polyimide laminate having a layer of a highly heat-resistant polyimide and a layer of a thermoplastic polyimide on at least one side of the layer of the highly heat-resistant polyimide, the method comprising:

• coextruding a solution containing a precursor of the highly heat-resistant polyimide, and a solution containing the thermoplastic polyimide in order to cast the solutions onto a supporter,
• the precursor of the highly heat-resistant polyimide and the thermoplastic polyimide having a reactive functional group or reactive functional groups respectively, each of which is capable of forming a bond therebetween, each bond being independently at least one bond selected from the group consisting of an imide bond, an amide bond, and a benzimidazole bond.