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US 9,926,415 B2Granted
Matte finish polyimide films and methods relating thereto
AssigneeE. I. Du Pont de Nemours and Company
InventorsThomas Edward Carney, Jeffrey Michael Bartolin, Meredith L. Dunbar, Scott John Herrmann
Life of this patent
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Abstract
The present disclosure is directed to a base film having a chemically converted polyimide, a particulate polyimide matting agent having a density from 1.3 to 1.5 g/cc and either a non-carbon black pigment or a dye. The particulate polyimide matting agent is present in an amount from 1.6 to 20 weight percent of the base film.
Claims6
A base film comprising:
- A. a chemically converted polyimide present in an amount from 55 to 96 weight percent of the base film, the chemically converted polyimide being derived from:
- a. 100 mole percent pyromellitic dianhydride, based upon a total dianhydride content of the chemically converted polyimide, and
- b. 100 mole percent 4,4′-oxydianiline based upon a total diamine content of the chemically converted polyimide;
- B. a non-carbon black inorganic pigment present in an amount from 2 to 35 weight percent of the base film, wherein the non-carbon black inorganic pigment is selected from the group consisting of cobalt oxide, Fe—Mn—Bi black, Fe—Mn oxide spinel black, (Fe,Mn)2O3 black, copper chromite black spinel, bone ash, bone char, hematite, micaceous iron oxide, black complex inorganic color pigments, CuCr2O4 black, (Ni,Mn,Co)(Cr,Fe)2O4 black, chromium green-black hematite, chrome iron oxide, Pigment Black 26, Pigment Black 27, Pigment Black 28, Pigment Brown 29, Pigment Black 30, Pigment Black 33, and mixtures thereof;
- and
- C. a particulate polyimide matting agent present in an amount from 1.6 to 9 weight percent of the base film, having a median particle size from 1.3 to 10 microns and having a refractive index from 1.65 to 1.85;
- and
- wherein the base film has a 60 degree gloss value from 2 to 35 on both sides.
5 more elements
A base film comprising:
- A. a chemically converted polyimide present in an amount from 55 to 96 weight percent of the base film, the chemically converted polyimide being derived from:
- a. 100 mole percent pyromellitic dianhydride, based upon a total dianhydride content of the chemically converted polyimide, and
- b. 100 mole percent 4,4′-oxydianiline based upon a total diamine content of the chemically converted polyimide;
- B. a non-carbon black inorganic pigment present in an amount from 2 to 35 weight percent of the base film, wherein the non-carbon black inorganic pigment is selected from the group consisting of cobalt oxide, Fe—Mn—Bi black, Fe—Mn oxide spinel black, (Fe,Mn)2O3 black, copper chromite black spinel, bone ash, bone char, hematite, micaceous iron oxide, black complex inorganic color pigments, CuCr2O4 black, (Ni,Mn,Co)(Cr,Fe)2O4 black, chromium green-black hematite, chrome iron oxide, Pigment Black 26, Pigment Black 27, Pigment Black 28, Pigment Brown 29, Pigment Black 30, Pigment Black 33, and mixtures thereof;
- and
- C. a particulate polyimide matting agent present in an amount from 1.6 to 9 weight percent of the base film and having a median particle size from 1.3 to 10 microns, the particulate polyimide matting agent and the chemically converted polyimide have a refractive index within and including 0.1 unit of each other;
- and
- wherein the base film has a 60 degree gloss value from 2 to 35 on both sides.
5 more elements
Dependencies are inferred from the claim text.