Single layer polymer films and electronic devices

A process for forming a single layer polymer film comprising a crosslinked polyimide film comprising a dianhydride and a diamine, wherein:

• the dianhydride, the diamine or both the dianhydride and the diamine comprise an alicyclic monomer, an aliphatic monomer or both an alicyclic monomer and an aliphatic monomer;
• the polymer film has an L* color of 30 or less and a 60° gloss of 15 or less;
• and
• the crosslinked polyimide film is formed by:
• (a) polymerizing the dianhydride and the diamine in the presence of a solvent to obtain a polyamic acid solution;
• (b) imidizing the polyamic acid solution to form a substantially imidized solution;
• (c) adding a crosslinking agent and a colorant to the substantially imidized solution;
• (d) casting the substantially imidized solution on a removeable substrate having a textured surface with a maximum roughness (Spv) of 6 μm or more to form a film;
• (e) crosslinking the polyimide while drying the film;
• and
• (f) removing the single layer polymer film from the textured substrate.

A process for forming a single layer polymer film comprising a crosslinked polyimide film comprising a dianhydride and a diamine, wherein:

• the dianhydride, the diamine or both the dianhydride and the diamine comprise an alicyclic monomer, an aliphatic monomer or both an alicyclic monomer and an aliphatic monomer;
• the polymer film has an L* color of 30 or less and a 60° gloss of 15 or less;
• and
• the crosslinked polyimide film is formed by:
• (a) polymerizing the dianhydride and the diamine in the presence of a first solvent to obtain a polyamic acid solution;
• (b) imidizing the polyamic acid solution to form a first substantially imidized solution;
• (c) precipitating the first substantially imidized solution with an antisolvent;
• (d) filtering and drying the first substantially imidized solution to obtain a solid polyimide resin;
• (e) dissolving the solid polyimide resin in a second solvent and adding a crosslinking agent and a low conductivity carbon black to form a second substantially imidized solution;
• (f) casting the second substantially imidized solution on a removeable substrate having a textured surface with a maximum roughness (Spv) of 6 μm or more to form a film;
• (g) crosslinking the polyimide while drying the film;
• and
• (h) removing the single layer polymer film from the textured substrate.