Matte finish polyimide films and methods relating thereto

Abstract

The present disclosure is directed to a base film having a thickness from 8 to 152 microns, a 60 degree gloss value from 2 to 35, an optical density greater than or equal to 2 and a dielectric strength greater than 1400 V/mil. The base film comprises a chemically converted (partially or wholly aromatic) polyimide in an amount from 71 to 96 weight percent of the base film. The base film further comprises a pigment and a matting agent. The matting agent is present in an amount from 1.6 to 10 weight percent of the base film, and has a median particle size from 1.3 to 10 microns. The pigment is present in an amount from 2 to 9 weight percent of the base film. The present disclosure is also optionally directed to coverlay films comprising the base film in combination with an adhesive layer.

Dependencies are inferred from the claim text.