Polymeric foam gaskets and seals
First Claim
1. 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.
2 Assignments
0 Petitions
Accused Products
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.
21 Citations
45 Claims
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1. 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.
- View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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2. 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.
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17. 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.
- View Dependent Claims (29, 30)
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18. 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.
- View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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31. 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.
- View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
Specification