Polymeric foam gaskets and seals
AssigneeChemque, Inc.
InventorAlexander Botrie
Life of this patent
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Abstract
An electrically conductive flexible polyurethane foam including a polyurethane and at least one conductive filler dispersed therein in an amount effective to provide EMI/RFI shielding, wherein the polyurethane comprises an isocyanate component to active hydrogen component in a ratio of at most about 0.20:1. Preferably, the foam has compression deflection value at 50% compression of at most about 25 psi, a foam density of at most 0.95 g/cm3 and/or noise shielding effectiveness at a frequency of about 20 to about 1000 MHz of at least about 10 dB.
Claims45
A gasket or seal comprising an electrically conductive flexible polyurethane foam comprising a polyurethane and at least one conductive filler dispersed therein in an amount effective to provide EMI/RFI shielding, wherein the polyurethane comprises an isocyanate component to active hydrogen component in a ratio of at most about 0.15:1, wherein the foam a density of at most about 3 g/cm3, wherein the foam has a noise shielding effectiveness at about 20 to about 1000 MHz of at least about 10 dB and a compression deflection value at 50% compression of at most about 25 psi, and wherein the conductive filler concentration is about 140 phr to about 900 phr.
An electrically conductive flexible polyurethane foam comprising a polyurethane and at least one conductive filler dispersed therein in an amount effective to provide EMI/RFI shielding, wherein the polyurethane comprises an isocyanate component to active hydrogen component in a ratio of at most about 0.15:1, and the foam has a compression deflection value at 50% compression of at most about 25 psi.
A gasket or seal comprising an electrically conductive flexible polyurethane foam comprising a polyurethane and at least one conductive filler dispersed therein in an amount effective to provide EMI/RFI shielding, wherein the polyurethane comprises an isocyanate component to active hydrogen component in a ratio of at most about 0.15:1, wherein the foam has a density of at most about 1.5 g/cm3, wherein the foam has a shielding effectiveness at about 20 to about 1000 MHz of at least about 30 dB and a compression deflection value at 50% compression of at most about 15 psi, and wherein the conductive filler concentration is about 140 phr to about 700 phr.
An electrically conductive flexible polyurethane foam comprising a polyurethane and at least one conductive filler dispersed therein in an amount effective to provide EMI/RFI shielding, wherein the polyurethane comprises an isocyanate component to active hydrogen component in a ratio of at most about 0.15:1, and the foam density is at most about 0.95 g/cm3.
An electrically conductive flexible polyurethane foam comprising a polyurethane and at least one conductive filler dispersed therein in an amount effective to provide EMI/RFI shielding, wherein the polyurethane comprises an isocyanate component to active hydrogen component in a ratio of at most about 0.15:1, and wherein the foam has a noise shielding effectiveness of the foam at a frequency of about 20 to about 1000 MHz of at least about 10 dB.
Dependencies are inferred from the claim text.