abstract |
The present invention provides a polyimide and a polyimide for a flexible element.nFilm, polyimide substrate, and diamine. The present invention describes a polyfluorene imide prepared from a diamine including a spiro ring group or a phenolphthalein group in the molecular structure. The polyfluorene imine can improve dimensional stability at a higher temperature, and therefore, it can provide a Polyimide film effective for flexible substrates. |