Form-in-place EMI gaskets
First Claim
Patent Images
1. An EMI gasket comprising a composition formed of:
- a.) a first component which is a primary polymer having end groups that are capable of chemically reacting with each other in the presence of moisture to form a derivative polymer having a longer average chain length than said primary polymer;
b.) a second component which is a noncross-linked elastomer that is not substantially chemically reactive with itself and with said first component; and
c.) a third component which is one or more electrically conductive fillers, wherein when said first, said second, said third components are intimately mixed, said composition, when maintained in the absence of moisture and other active hydrogen donor materials, being readily extrudable and otherwise conventionally moldable thermoplastic composition but, upon exposure to moisture, becoming essentially thermoset.
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Abstract
A form in place conductive gasket is disclosed. The gasket, foamed, gelled or unfoamed is made of one or more elastomer resins, such as silicone urethane and/or thermoplastic block copolymers and is either filled with a conductive filler and lined onto a desired substrate or lined onto the substrate unfilled and then coated with a conductive outerlayer, such as a silver filled elastomer or a conductive flocked layer. A process and system for making the gaskets are also disclosed.
81 Citations
6 Claims
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1. An EMI gasket comprising a composition formed of:
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a.) a first component which is a primary polymer having end groups that are capable of chemically reacting with each other in the presence of moisture to form a derivative polymer having a longer average chain length than said primary polymer; b.) a second component which is a noncross-linked elastomer that is not substantially chemically reactive with itself and with said first component; and c.) a third component which is one or more electrically conductive fillers, wherein when said first, said second, said third components are intimately mixed, said composition, when maintained in the absence of moisture and other active hydrogen donor materials, being readily extrudable and otherwise conventionally moldable thermoplastic composition but, upon exposure to moisture, becoming essentially thermoset. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification