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US 2004/0071990 A1Published application
Electrically conductive polyimide compositions having a carbon nanotube filler component and methods relating thereto
AssigneeDuPont-Toray Co. Ltd.
InventorsHideki Moriyama, Kenji Uhara
Life of this patent
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Abstract
This invention is directed to polyimide films having a carbon nanotube filler to provide a surface resistivity in a range from 50 ohm/square to 1.0×1015 ohms/square. The electrically conductive polyimides of the present invention have an excellent balance of properties relative to conventional polyimides having a conductive filler, due at least in part to the film's water content, degree of imidization and polymer orientation.
Claims12
An electrically conductive layer, comprising:
- A. a continuous or discontinuous, non-conductive first phase comprising a polyimide base polymer, and
- B. a discontinuous, conductive second phase comprising 80, 85, 90, 95, 96, 97, 98, 99 or 100 weight percent carbon nanotube particles, wherein the weight percent of the second phase, based upon the total weight of both phases, is in a range between any two of the following percentages:
- 0.10, 0.20, 0.30, 0.40, 0.50, 0.75, 1.0, 2.0, 3.0, 4.0, 5.0, 10.0, 15.0, 20.0, 25.0, 30.0 35.0, 40.0, 45.0, 46, 47, 48, 49, and 50%,
- wherein the layer has a thickness between two and 500 microns, and
- wherein the layer or a precursor thereto is oriented on a molecular scale in one or more directions to provide a surface electrical resistivity between, and including, any two of the following 50, 75, 100, 250, 500, 750, 1×101, 1×102, 1×103, 1×104, 1×105, 1×106, 1×107, 1×108, 1×109, 1×1010, 1×1011, 1×1012, 1×1013, 1×1014, and 1×1015 ohms per square.
2 more elements
A process for making an electrically conductive polyimide film comprising:
- (a) dispersing a carbon nanotube particle into a polar organic solvent to form a slurry;
- (b) mixing the slurry with a polyamic acid derived from a reaction of substantially equimolar amounts of at least one dianhydride and at least one diamine in a polar organic solvent to form a mixed polymer;
- (c) casting the mixed polymer of step (b) onto a surface;
- (d) converting and drawing the cast mixed polymer of step (c) to provide a layer with a solids content of from 95 to 99.99 weight percent and a base polymer that is from 90 to 99.99 percent imidized.
1 more element
Dependencies are inferred from the claim text.