| abstract |
The present invention provides a polyfluorene imine membrane which is guided in a strong polyfluorene imine chain.nThe structure is incorporated, thereby exhibiting excellent heat resistance and optical characteristics. Furthermore, since the polyimide of the present invention includes a specific structure, it has excellent transparency, heat resistance, mechanical strength, and flexibility. Therefore, it can be used in, for example, a substrate for an element, a cover substrate for a display, an optical film, and a laminate. Various fields such as circuit packages, adhesive films, multilayer flexible printed circuits, tapes, touch panels, and protective films for optical discs. The invention further provides a polyfluorene imide precursor solution and a transparent polyfluorene imide substrate. |