Corrosion-resistant, form-in-place EMI shielding gasket
First Claim
1. A one-part, fluent polymeric reaction system which may be applied as a form-stable bead to a surface of a substrate and cured by thermal-addition thereon under substantially atmospheric pressure to form a corrosion-resistant, electrically-conductive, elastomeric EMI shielding gasket having an EMI shielding effectiveness of at least about 80 dB substantially over a frequency range of between about 10 MHz and about 10 GHz, said reaction system having a strip volume resistivity of from about 500-1000 mΩ
- -cm and comprising an admixture of;
(a) a silicone resin binder component including a first functional group;
(b) a cross-linking agent component including a second functional group reactive with said first functional group of said binder component;
(c) a metallic catalyst component effective to catalyze the reaction of said first and second functional groups; and
(d) an electrically-conductive filler component comprising nickel-coated graphite particles.
3 Assignments
0 Petitions
Accused Products
Abstract
An electrically-conductive, corrosion-resistant EMI shielding gasket having an EMI shielding effectiveness of at least about 80 dB at between about 10 MHz and 10 GHz. The gasket is formed-in-place on a surface of a substrate as applied to such surface in a form-stable bead of a fluent polymeric reaction system and cured thereon under substantially atmospheric pressure. The reaction system has a strip volume resistivity of from about 500-1000 mΩ-cm and is admixture of: (a) an elastomeric resin binder component; and (b) an electrically-conductive filler component of nickel-coated graphite particles. The substrate surface may be that of a housing or other enclosure for electronic components.
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Citations
36 Claims
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1. A one-part, fluent polymeric reaction system which may be applied as a form-stable bead to a surface of a substrate and cured by thermal-addition thereon under substantially atmospheric pressure to form a corrosion-resistant, electrically-conductive, elastomeric EMI shielding gasket having an EMI shielding effectiveness of at least about 80 dB substantially over a frequency range of between about 10 MHz and about 10 GHz, said reaction system having a strip volume resistivity of from about 500-1000 mΩ
- -cm and comprising an admixture of;
(a) a silicone resin binder component including a first functional group; (b) a cross-linking agent component including a second functional group reactive with said first functional group of said binder component; (c) a metallic catalyst component effective to catalyze the reaction of said first and second functional groups; and (d) an electrically-conductive filler component comprising nickel-coated graphite particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- -cm and comprising an admixture of;
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10. An electrically-conductive, corrosion-resistant EMI shielding gasket having an EMI shielding effectiveness of at least about 80 dB substantially over a frequency range of between about 10 MHz and about 10 GHz which is formed-in-place on a surface of a substrate as applied to said surface in a form-stable bead of a fluent polymeric reaction system and cured thereon under substantially atmospheric pressure, said reaction system having a strip volume resistivity of from about 500-1000 mΩ
- -cm and comprising an admixture of;
(a) an elastomeric resin binder component; and (b) an electrically-conductive filler component comprising nickel-coated graphite particles. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- -cm and comprising an admixture of;
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22. A method of forming an electrically-conductive, corrosion-resistant elastomeric EMI shielding gasket in situ on a surface of a substrate, said gasket having an EMI shielding effectiveness of at least about 80 substantially over a frequency range of between about 10 MHz and about 10 GHz, and said method comprising the steps of:
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(a) providing a fluent, polymeric reaction mixture having a strip volume resistivity of from about 500-1000 mΩ
-cm and comprising;(i) an elastomeric resin binder component; and (ii) an electrically-conductive filler component comprising nickel-coated graphite particles; (b) applying a bead of said reaction mixture to the surface of the substrate; and (c) curing said reaction mixture under substantially atmospheric pressure to form said gasket on the surface of the substrate. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification