A flame retardant, electromagnetic interference (EMI) shielding gasket construction. The construction includes a resilient core member formed of a foamed elastomeric material, an electrically-conductive fabric member surrounding the outer surface of the core member, and a flame retardant layer coati
A flame retardant, electromagnetic interference (EMI) shielding gasket construction. The construction includes a resilient core member formed of a foamed elastomeric material, an electrically-conductive fabric member surrounding the outer surface of the core member, and a flame retardant layer coating at least a portion of the interior surface of the fabric member. The flame retardant layer is effective to afford the gasket construction with a flame class rating of V-0 under Underwriter's Laboratories (UL) Standard No. 94.
대표청구항▼
1. A flame retardant, electromagnetic interference (EMI) shielding gasket comprising:a resilient core member extending lengthwise along a central longitudinal axis and having an outer surface extending circumferentially about said longitudinal axis, said core member being formed of a foamed elastome
1. A flame retardant, electromagnetic interference (EMI) shielding gasket comprising:a resilient core member extending lengthwise along a central longitudinal axis and having an outer surface extending circumferentially about said longitudinal axis, said core member being formed of a foamed elastomeric material;an electrically-conductive fabric member surrounding the outer surface of said core member, said fabric member having an interior surface disposed facing the outer surface of said core member and an oppositely-facing, exterior surface, at least the exterior surface being electrically-conductive and the exterior surface defining with the interior surface a thickness dimension of the fabric member therebetween; anda flame retardant layer coating at least a portion of the interior surface of said fabric member, said flame retardant layer comprising at least about 50% by dry weight of one or more flame retardant additives and penetrating into said fabric member to a depth which is less than the thickness dimension of said fabric member such that the exterior surface of said fabric member remains electrically-conductive. 2. The gasket of claim 1 wherein said flame retardant layer has a thickness of between about 2-4 mils (0.05-0.10 mm). 3. The gasket of claim 1 wherein said flame retardant layer is formed as a cured film of a flame retardant acrylic latex emulsion. 4. The gasket of claim 1 wherein said fabric member is a metal-plated cloth. 5. The gasket of claim 4 wherein said cloth comprises fibers selected from the group consisting of cotton, wool, silk, cellulose, polyester, polyamide, nylon, and combinations thereof, and said metal is selected from the group consisting of copper, nickel, silver, nickel-plated-silver, aluminum, tin, and combinations thereof. 6. The gasket of claim 1 wherein said foamed elastomeric material is selected from the group consisting of polyethylenes, polypropylenes, polypropylene-EPDM blends, butadienes, styrene-butadienes, nitriles, chlorosulfonates, neoprenes, urethanes, silicones, and polyolefin resin/monoolefin copolymer blends, and combinations thereof. 7. The gasket of claim 1 wherein said fabric member has a thickness of between about 2-4 mils (0.05-0.10 mm). 8. The gasket of claim 1 wherein said flame retardant layer is effective to afford the gasket a flame class rating of V-0 under Underwriter's Laboratories (UL) Standard No. 94. 9. The gasket of claim 1 wherein said one or more flame retardant additives are selected from the group consisting of aluminum hydrate, antimony trioxide, phosphate esters, and halogenated compounds. 10. The gasket of claim 1 wherein said flame retardant layer comprises between about 50-83% by dry weight of one or said one or more flame retardant additives.
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