Patent ID: 11926705
Assignee: TAIMIDE TECHNOLOGY INCORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A black matte polyimide film, comprising:
polyimide, which is present in an amount of 75 to 93 wt % of the polyimide film, wherein the polyimide is obtained by polymerization of a dianhydride and a diamine to form a polyimide precursor, followed by chemical cyclization of the polyimide precursor, wherein the dianhydride is pyromellitic dianhydride, and the diamine comprises 5˜7 mol % of p-phenylenediamine and 95˜93 mol % of 4,4′-diaminodiphenyl ether;
carbon black, which is present in an amount of 2 to 8 wt % of the polyimide film; and polyimide fine powder having a particle size between 2 and 10 μm and being present in an amount of 5 to 10 wt % of the polyimide film,
wherein the polyimide film has a 60° glossiness between 5 and 30 and a thermal expansion coefficient of less than 41 ppm/° C.,
wherein the black matte polyimide film has an optical transmittance variation of less than 0.1% and a glossiness variation of less than 21% after soaking in 10 wt % NaOH at 50° C. for 10 minutes.