Electrical component with fillers having semi-resistive properties and composite systems comprising the same
View Patent ↗The present invention relates to an electrical component, which has an electrically conductive composition that is stable at high temperatures, and includes a partially pyrolized carbon based powder filler and a host matrix. The present invention also relates to an electrophotographic system which further is stable at conventional ambient environmental use conditions, such as different humidity levels and/or ambient temperature ranges.
1. An electrical component in an electrophotographic system, comprising:
an electrically conductive composition which includes a partially pyrolized carbon based powder filler and a host matrix.
2. The electrical component according to claim 1 , wherein the electrical component is selected from the group consisting of an intermediate transfer belt, a bias transfer belt, a bias charging belt, a bias transfer roll, a bias charging roll, a developer roll, developer belt, fuser belt, pre and mid heater belt, fuser roll, pressure roll, and donor roll.
3. The electrical component according to claim 2 , wherein the electrical component is a bias transfer roll.
4. The electrical component according to claim 2 , wherein the electrical component is a bias charging roll.
5. The electrical component according to claim 2 , wherein the electrical component is an intermediate transfer belt.
6. The electrical component according to claim 2 , wherein the electrical component is a fuser belt.
7. The electrical component according to claim 1 , wherein the electrically conductive composition is stable at high temperature ranges of about 100° C.to about 1900° C.
8. The electrical component according to claim 1 , wherein the electrically conductive composition further is stable under ambient environmental use conditions, which include a range of temperatures and humidity levels from about 15.5° C. and 20% relative humidity to about 26.6° C. and 80% relative humidity.
9. The electrical component according to claim 1 , wherein the partially pyrolized carbon based powder filler is pyrolized organic polymer based fiber or resin in a powder form.
10. The electrical component according to claim 1 , wherein the partially pyrolized carbon based powder filler is carbonized polyacrylonitrile fiber or filler in a powder form.
11. The electrical component according to claim 1 , wherein the partially pyrolized carbon based powder filler is selected from the group consisting of a fine powder of spheres, near spheres, flakes, needles, shards, rods and mixtures and blends thereof.
12. The electrical component according to claim 1 , wherein the host matrix has electrically conductive resistive properties or insulating properties.
13. The electrical component according to claim 1 , wherein the host matrix further comprises one or more organic polymer(s).
14. The electrical component according to claim 13 , wherein the organic polymer is selected from the group consisting of polyesters, polyamides, polyvinyls, poly-cellulose derivatives, fluoroelastomers, polysiloxanes, polysilanes, polycarbazoles, polyphenothiazines, polyimides, polyetherketones, polyetherimides, polyethersulphones, polyurethanes, polyether urethanes, polyester urethanes, polyesters, polytetrafluoroethylenes, polycarbonates and polyacrylonitriles, poly(ester-imides), polyfluoroalkoxys, poly(amide-imides) and copolymers and mixtures thereof.
15. The electrical component according to claim 1 , wherein the electrically conductive composition comprises about 0.1% to 99% by weight pyrolized carbon based powder filler.
16. The electrical component according to claim 15 , wherein the electrically conductive composition comprises about 5% to 50% by weight pyrolized carbon based powder filler.
17. The electrical component according to claim 1 , wherein the partially pyrolized carbon based powder fillers are fine powders with a particle size from about 0.001 microns to about 10 microns.
18. The electrical component according to claim 17 , wherein the partially pyrolized carbon based powder fillers have a particle size of less than about 0.9 microns.
19. The electrical component according to claim 17 , wherein the partially pyrolized carbon based powder filler has a length to cross-sectional diameter ratio of 0.01 to 1000.
20. The electrical component according to claim 1 , wherein the electrically conductive composition further comprises additive materials selected from the group consisting of glass, metal-plated glass, metal particles containing glass, metal oxides, doped metal oxides, intrinsically conductive polymers, ceramic and organic fibers.
21. The electrical component according to claim 1 , wherein the electrically conductive composition further comprises filler(s) having magnetic properties.
22. The electrical component according to claim 1 , wherein the partially pyrolized carbon based powder fillers have a D.C. volume resistivity of from about 1×10 −5 ohm-cm to about 1×10 13 ohm-cm.
23. An electrophotographic system comprising an electrical component, which includes an electrically conductive composition, which is stable at high temperature, and includes a partially pyrolized carbon based powder filler and a compatible host matrix.
24. The electrophotographic system of claim 23 , wherein the electrically conductive matrix composition is stable at high temperatures from about 100° C. to about 1900° C.
25. The electrophotographic system of claim 24 , wherein the electrically conductive matrix composition further is stable under ambient environmental use conditions, which include a range of temperatures and humidity levels from about 15.5° C. and 20% relative humidity to about 26.6° C. and 80% relative humidity.
26. The electrophotographic system according to claim 24 , wherein the electrical component is selected from the group consisting of an intermediate transfer belt, a bias transfer belt, a bias charging belt, a bias transfer roll, a bias charging roll, a developer roll, developer belt, fuser belt, fuser roll, pre and mid heater belt, pressure roll, and donor roll.
27. The electrophotographic system according to claim 24 , wherein the partially pyrolized carbon based powder fillers are carbonized polyacrylonitrile fibers in a powder form.
28. The electrophotographic system according to claim 24 , wherein the partially pyrolized carbon based powder fillers are pyrolized organic polymer based fibers or resins in a powder form.
29. The electrophotographic system according to claim 24 , wherein the matrix further comprises an organic polymer selected from the group consisting of polyesters, polyamides, polyvinyls, poly-cellulose derivatives, fluoroelastomers, polysiloxanes, polysilanes, polycarbazoles, polyphenothiazines, polyimides, polyetherketones, polyetherimides, polyethersulphones, polyurethanes, polyether urethanes, polyester urethanes, polyesters, polytetrafluoroethylenes, polycarbonates and polyacrylonitriles and copolymers and mixtures thereof.
30. The electrophotographic system according to claim 24 , wherein the electrically conductive composition comprises from about 0.1% to about 99% by weight pyrolized carbon based powder fillers.