Electroconductive foams
AssigneeThe Dow Chemical Company
InventorPeter C. Yao
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Abstract
A lightweight, electroconductive foam comprising an effective amount of a conductive ionic salt, a polymer capable of complexing said conductive ionic salt and an effective amount of particulate conductive material such as carbon black or metal is disclosed. Additionally, a method of preparing a lightweight electroconductive foam having a surface resistivity less than about 10.sup.10 ohms per square by an extrusion process is disclosed. Foams of the present invention exhibit relatively high conductivities yet require only relatively low amounts of particulate conductive material.
Claims23
A polymeric resin suitable for forming an electroconductive foam, said resin comprising:
- from about 0.5 percent to about 15 percent of a conductive ionic salt, said salt selected from the group consisting of sodium tetraphenylboron, lithium perfluoroalkane sulfonate, potassium perfluoralkyl sulfonate, sodium thiocyanate, sodium trifluoromethane sulfonate, lithium trifluoromethane sulfonate, and combinations thereof;
- a polymer capable of complexing said conductive ionic salt., said polymer selected from the group consisting of a copolymer of ethylene and carbon monoxide, polyethers, polyesters, polyamides, polyurethanes, polyvinyl chlorides, polyaldehydes, and combinations thereof;
- and
- an effective amount of particulate conductive material, said particulate conductive material selected from the group consisting of carbon black, finely divided metal particles, and combinations thereof, wherein said effective amount of said particulate conductive material is such that a foam formed from said resin is sufficiently electrically conductive to dissipate static electricity.
A lightweight electroconductive foam comprising:
- from about 0.5 percent to about 15 percent of a conductive ionic salt, said salt selected from the group consisting of sodium tetraphenylboron, lithium perfluoroalkane sulfonate, potassium perfluoralkyl sulfonate, sodium thiocyanate, sodium trifluoromethane sulfonate, lithium trifluoromethane sulfonate, and combinations thereof;
- a polymer capable of complexing said conductive ionic salt, said polymer selected from the group consisting of a copolymer of ethylene and carbon monoxide, polyethers, polyesters, polyamides, polyurethanes, polyvinyl chlorides, polyaldehydes, and combinations thereof;
- and
- an effective amount of particulate conductive material, said particulate conductive material selected from the group consisting of carbon black, finely divided metal particles, and combinations thereof, wherein said effective amount of said particulate conductive material is such that said foam is sufficiently electrically conductive to dissipate static electricity.
Dependencies are inferred from the claim text.