Flame retardant emi shielding materials and method of...

H - Electricity – 05 – K

Patent

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H05K 9/00 (2006.01)

Patent

CA 2318520

A flame retardant, electrically-conductive EMI shielding material and method, the material being particularly adapted for use in fabric-over-foam EMI shielding gasket constructions. In construction, a generally planar, porous fabric member is provided as having at least an electrically-conductive first side and a second side defining a thickness dimension therebetween. A curable layer of a fluent, flame retardant composition is applied under a predetermined hydrodynamic pressure and viscosity to at least a portion of the second side of the fabric member. The hydrodynamic pressure and viscosity of the composition are controlled to delimit the penetration of the layer into the fabric member to a depth which is less than the thickness dimension of said fabric member. The layer then is cured to form a flame retardant surface coating on the second side of the fabric member such that the first side of said fabric member remains electrically-conductive.

La présente invention concerne un procédé et un matériau de blindage EMI, électriquement conducteur et résistant au feu, particulièrement bien adapté pour les garnitures de blindage EMI en mousse recouvertes de tissu. Dans une garniture, un élément de tissu poreux, généralement plan, présente une première face électriquement conductrice et une seconde face qui définissent entre elles une épaisseur. Une couche polymérisable d'une composition, fluide, résistante au feu est appliquée, dans des conditions prédéterminées de pression hydrodynamique et de viscosité, sur au moins une partie de la seconde face de l'élément de tissu. Le contrôle de la pression hydrodynamique et de la viscosité de la composition sert à délimiter la pénétration de la couche dans l'élément de tissu à une profondeur inférieure à l'épaisseur dudit élément. La couche est alors polymérisée de manière à constituer, sur la seconde face de l'élément de tissu, un revêtement résistant au feu tel que ladite face de l'élément de tissu reste électriquement conductrice.

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