Conductive polymer compositions containing fibrillated fibers and devices
First Claim
Patent Images
1. A polymeric PTC composition comprising an organic polymer, a conductive filler;
- an inert filler including fibrillated fibers and, optionally, one or more additives selected from the group consisting of flame retardants, stabilizers, antioxidants, antiozonants, accelerators, pigments, foaming agents, crosslinking agents, coupling agents, co-agents and dispersing agents.
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Accused Products
Abstract
The invention provides polymeric PTC compositions and electrical PTC devices with higher voltage capability and improved electrical stability. Depending on device design, the composition can be used in low to high voltage applications 6 volts up to 240 volts.
13 Citations
38 Claims
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1. A polymeric PTC composition comprising an organic polymer, a conductive filler;
- an inert filler including fibrillated fibers and, optionally, one or more additives selected from the group consisting of flame retardants, stabilizers, antioxidants, antiozonants, accelerators, pigments, foaming agents, crosslinking agents, coupling agents, co-agents and dispersing agents.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An electrical device which exhibits PTC behavior, comprising:
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(a) a conductive polymeric composition that comprises a crystalline or semi-crystalline polymer, a conductive filler, an inert filler including fibrillated fibers and, optionally, one or more additives selected from the group consisting of flame retardants, stabilizers, antioxidants, antiozonants, accelerators, pigments, foaming agents, crosslinking agents and dispersing agents, the composition having a resistivity at 25°
C. of 100 Ω
cm or less and a resistivity at its switching temperature that is at least 104 to 105 times the resistivity at 25°
C.; and
(b) at least two electrodes which are in electrical contact with the conductive polymeric composition to allow a DC or an AC current to pass through the composition under an applied voltage, wherein the device has a resistance at 25°
C. of 500 mΩ
or less with a desirable design geometry.- View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification