Polyimide varnish for film formation for front plate for surface protection of flexible display, manufacturing method of polyimide film for front plate for surface protection of flexible display using the same Polyimide film for front plate for surface protection of flexible display

摘要

An object of the present invention is to provide a polyimide varnish which can form a film having a good appearance and good flexibility, and is a polyimide varnish containing a polyimide polymer, a solvent and water, The polymer is a transparent polyimide polymer having a total light transmittance of 85% or more and a yellowness of 5 or less when a film having a thickness of 50 μm is formed from the polyimide polymer. The polyimide-based varnish is capable of dissolving the polyimide-based polymer and has a water content of 0.60 to 4.5% by mass based on the total mass of the polyimide-based varnish.