The present invention provides a novel polyimide containing a diamine component having a fluorene skeleton and a novel polyimide-based polymer electrolyte membrane containing this polyimide as a main component and having properties based on this polyimide ...

A binder composition for an electrode of an electric storage device is provided. The binder composition comprises (A) at least one polymer selected from the group consisting of polyamic acids and imidized polymers thereof having an imidization rate of 50% ...

An electrolyte membrane (1) includes a material layer (1) containing a hydrocarbon-based electrolyte as a main component, and a surface layer (5) laminated with the material layer (1). The surface layer (5) is a layer containing, as a main component, a pol...