Matte finish polyimide films and methods relating thereto

A chemically converted polyimide film comprising:

• (1) a chemically converted polyimide in an amount from 71 to 96 weight percent of the film, the chemically converted polyimide being derived from pyromellitic dianhydride and an aromatic diamine;
• (2) a low conductivity carbon black present in an amount from 2 to 9 weight percent of polyimide film;
• and
• (3) an alumina or matting agent present in an amount from 7 to 10 weight percent or a barium sulfate matting agent present in an amount of 10 weight percent to provide a 60 degree gloss from 2 to 35, wherein the matting agent has a median particle size from 1.3 to 10 microns, and a density from 2 to 4.5 g/cc.

A reduced gloss, chemically converted polyimide film, comprising:

• (1) a chemically converted polyimide being derived from pyromellitic dianhydride and an aromatic diamine, wherein,
• (i) the polyimide film contains a low conductivity carbon black present in an amount from 2 to 9 weight percent of the film with a mean particle size from 0.2 to 1 micron and a volatile content greater than or equal to 5%;
• (ii) the film contains as a matting agent, alumina, in an amount from 7 to 10 weight percent of the polyimide film or barium sulfate in an amount of 10 weight percent of the polyimide film with a median particle size from 1.3 to 10 microns and a density from 2 to 4.5 g/cc;
• and
• (2) the polyimide film has a thickness from 10 to 40 microns, a 60 degree gloss from 10 to 35;
• and an optical density greater than or equal to 2.