Foam absorber
First Claim
1. A process for producing a foam material having electromagnetic energy attenuation characteristics which comprisesproviding a solution of a curable epoxy resin composition in a solvent,adding carbon and a metal selected from the group consisting of silver, copper and nickel to said resin composition,spraying the resulting mixture onto a surface of an open cell reticulated polyurethane foam substrate, causing said mixture to coat said surface of the foam substrate and to penetrate and filter through said foam substrate in gradually decreasing amount from said coated surface to a final depth in said foam to provide a dielectric gradient layer, andcuring said epoxy resin to form a carrier for said carbon and metal of said dielectric gradient, said cured epoxy carrier having substantially the same flexibility characteristics as said polyurethane foam.
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Accused Products
Abstract
A foam absorber having electromagnetic energy attenuation characteristics comprising an open cell reticulated polyurethane foam impregnated with a conductive ink applied to a surface of the foam substrate. The conductive ink is applied as by spraying to a surface of the foam, coating such surface and gradiently loading the foam with the ink by penetration of the ink in gradually decreasing amount into the foam to a final depth therein. The conductive ink is comprised of an epoxy resin carrier and a combination of carbon and a metal such as silver, copper or nickel, preferably silver. The ink is applied as a curable mixture containing a solvent, to the foam substrate, the solvent is evaporated following coating and penetration of the ink into the foam, and the epoxy carrier of the ink in the foam substrate is cured.
31 Citations
6 Claims
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1. A process for producing a foam material having electromagnetic energy attenuation characteristics which comprises
providing a solution of a curable epoxy resin composition in a solvent, adding carbon and a metal selected from the group consisting of silver, copper and nickel to said resin composition, spraying the resulting mixture onto a surface of an open cell reticulated polyurethane foam substrate, causing said mixture to coat said surface of the foam substrate and to penetrate and filter through said foam substrate in gradually decreasing amount from said coated surface to a final depth in said foam to provide a dielectric gradient layer, and curing said epoxy resin to form a carrier for said carbon and metal of said dielectric gradient, said cured epoxy carrier having substantially the same flexibility characteristics as said polyurethane foam.
Specification