Electrically conductive coatings and method of their use
First Claim
1. A coating composition effective in emitting heat without breaking down when connected to a source of electricity, which comprises:
- (a) a binder;
(b) amorphous carbon of particle size between about 0.001 and less than 1 micron;
(c) elemental graphite of particle size between about 0.001 and less than 1 micron; and
(d) a volatile solvent;
wherein the weight amount of (b) and (c) together ranges from between about 5 weight-% and about 80 weight-% based on the non-volatile solids content of the coating composition.
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Accused Products
Abstract
It has been discovered that finely ground elemental graphite enhances the electrical conductivity of a coating when added to conductive amorphous carbon, using any one of several different binders in formulating the coating. The coating can be energized with electrical energy creating an electrical resistance heat element. Such combination of amorphous carbon and elemental graphite particles, ranging in size from about 0.001 to less than 1 micron, creates a more uniform conductive coating compared to use of larger sized particles, where the amount of conductive particles ranges from about 5 to about 80 weight-% based on the non-volatile solids content of the coating formulation (e.g., without solvent and other components that evolve (are driven off) from the coating during drying).
19 Citations
14 Claims
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1. A coating composition effective in emitting heat without breaking down when connected to a source of electricity, which comprises:
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(a) a binder;
(b) amorphous carbon of particle size between about 0.001 and less than 1 micron;
(c) elemental graphite of particle size between about 0.001 and less than 1 micron; and
(d) a volatile solvent;
wherein the weight amount of (b) and (c) together ranges from between about 5 weight-% and about 80 weight-% based on the non-volatile solids content of the coating composition. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for generating heat, which comprises:
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(a) forming a dried film on a substrate from a non-metallic coating composition, which comprises;
(1) a binder;
(2) amorphous carbon of particle size between about 0.001 and less than 1 micron;
(3) elemental graphite of particle size between about 0.001 and less than 1 micron;
(4) a volatile solvent;
wherein the weight amount of (2) and (3) together ranges from between about 5 weight-% and about 80 weight-% based on the non-volatile solids content of the coating composition;
(b) attaching electrodes to said dried film;
(c) connecting said electrodes to a source of electricity; and
(d) energizing said source of electricity. - View Dependent Claims (8, 9)
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10. An electrically conductive coating effective as one or more of a ground plane or electromagnetic radiation shield without breaking down when exposed to electromagnetic radiation, which comprises:
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(a) a binder;
(b) amorphous carbon of particle size between about 0.001 and less than 1 micron;
(c) elemental graphite of particle size between about 0.001 and less than 1 micron; and
(d) a volatile solvent;
wherein the weight amount of (b) and (c) together ranges from between about 5 weight-% and about 80 weight-% based on the non-volatile solids content of the coating composition. - View Dependent Claims (11, 12)
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13. A method for grounding, which comprises:
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(a) forming a dried film on a substrate from a non-metallic coating composition, which comprises;
(1) a binder;
(2) amorphous carbon of particle size between about 0.001 and less than 1 micron;
(3) elemental graphite of particle size between about 0.001 and less than 1 micron;
(4) a volatile solvent;
wherein the weight amount of (2) and (3) together ranges from between about 5 weight-% and about 80 weight-% based on the non-volatile solids content of the coating composition, (b) attaching electrodes to said dried film; and
(c) connecting said electrodes to an electrical ground. - View Dependent Claims (14)
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Specification