Method for manufacturing colorless transparent glass-fabric reinforced polyimide film for flexible displays

摘要

A method of manufacturing a colorless transparent polyimide film having reinforced glass fabric for flexible displays, suitable for use in increasing optical transmittance of a polyimide substrate having reinforced glass fabric for flexible displays. This method enables the glass fabric and the colorless transparent polyimide film to be matched in refractive index when the glass fabric is reinforced in the colorless transparent polyimide film to enhance thermal and mechanical properties of a substrate for flexible displays, thus satisfying high optical transparency and optical transmittance of 85% or more, required of a substrate for flexible displays, and thereby the colorless transparent polyimide film having reinforced glass fabric can be used as a substrate for flexible displays.

主权项

1. A method of manufacturing a colorless transparent polyimide film with glass fabric reinforced, comprising:
(1) preparing a polyamic acid solution; (2) positioning glass fabric on a substrate, and casting the polyamic acid solution on the glass fabric in a vacuum oven; (3) evaporating a solvent from the cast polyamic acid solution by controlling temperature of the vacuum oven to form a polyamic acid film on the substrate; and (4) subjecting the polyamic acid film to imidization through thermal curing, wherein the polyamic acid solution is a polyamic acid solution (C) prepared by mixing polyamic acid solution (A) with higher refractive index and polyamic acid solution (B) with lower refractive index than that of the glass fabric, upon forming the polyimide film.