METHOD OF MANUFACTURING AN OPTICAL FUNCTIONAL FILM, OPTICAL FUNCTIONAL FILM, POLARIZING PLATE, OPTICAL ELEMENT AND IMAGE DISPLAY DEVICE

摘要

A process for producing an optical functional film having a polyimide layer is provided, which includes an application step of applying a coating liquid containing polyimide and having a viscosity gamma of 100gamma3000 mPa.s on a substrate film by a die coater having an upstream die lip and a downstream die lip, thereby forming a polyimide layer on the substrate film, in which D2=50 mum and 0D1-D2=200 mum are satisfied, in which D1 represents a distance between a leading end of the upstream die lip and the substrate film and D2 represents a distance between a leading end of the downstream die lip and the substrate film.