Patent ID: 8574720

Claim:
A base film comprising: A. a chemically converted polyimide in an amount from 71 to 96 weight percent of the base film, the chemically converted polyimide being derived from: a. at least 50 mole percent of an aromatic dianhydride, based upon a total dianhydride content of the polyimide, and b. at least 50 mole percent of an aromatic diamine based upon a total diamine content of the polyimide; B. a low conductivity carbon black present in an amount from 2 to 9 weight percent of the base film; and C. a matting agent with a density from 2 to 4.5 g/cc that provides a 60 degree gloss from 10 to 35, and: a. is alumina present in an amount from 7 to 10 weight percent of the base film, or barium sulfate present in an amount of 10 weight percent of the base film and b. has a median particle size from 1.3 to 10 microns.