Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1992-09-29
1994-07-05
Ryan, Patrick J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428209, 428901, B32B 900
Patent
active
053266366
ABSTRACT:
An electrically conductive cement having substantially stable conductivity and resistance characteristics under high humidity conditions comprises a mixture of two epoxy resins with the proportion of each epoxy resin adjusted to provide a volumetric shrinkage in the mixture in the 4 to 16% and a conductive silver particular filler including agglomerates having size and surface characteristics that maintain stable electrical contact with an electrical component lead. The epoxy mixture is preferably a combination of a high-shrinkage epoxy resin and a lower-shrinkage epoxy resin in the appropriate amounts of each so as to produce the desired volumetric shrinkage characteristic. The conductive particle filler is preferably an admixture of silver flakes, silver powder, and an effective amount of silver agglomerates. The agglomerates are irregularly shaped particles having multiple surface indentations and recesses to produce many rough-edged salients or ridges and having a particle length, width, and thickness aspect ratio of about 1:1:1. An effective amount of such agglomerates appears to effect penetration of surface oxides when establishing the cemented connection as a result of the volumetric shringage of the polymeric carrier upon curing.
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Chu Ang-Ling
Durand David
Vieau David P.
Wei Tai S.
Lee Kam F.
Poly-Flex Circuits, Inc.
Ryan Patrick J.
LandOfFree
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