Multi-layer polyimide film and method of manufacturing the same

摘要

This invention relates to a multi-layer polyimide film and a method of manufacturing the same. The multi-layer polyimide film may include a functional filler. The multi-layer polyimide film is manufactured according to the method of this invention. The method includes adding tetracarboxylic acid dianhydride to a diamine solution at an equal mole ratio to form a polyamic acid solution; mixing some of the polyamic acid solution with a functional filler; adding the polyamic acid solution having the functional filler and the polyamic acid solution without the functional filler respectively to mix with aliphatic carboxylic acid anhydride and tertiary amine contained in mixing tanks to form two mixed solutions; supplying the two mixed solutions respectively to at least two reservoirs of a slot die coating device; extruding the two mixed solutions simultaneously from the slot die coating device onto a conveyor belt, then transporting the conveyor belt coated with the two mixed solutions to an oven for heating to form a self-supporting film; and carrying out thermal curing or infrared curing for the self-supporting film to convert remaining amide groups to imide groups completely to form a multi-layer polyimide film.