Abstract:
An electrically conductive cement which when used to bond electrically conductive mating surfaces provides substantially stable conductivity characteristics under high humidity conditions; comprised of a carrier that provides a volumetric shrinkage of more than about 6.8% (vol.) and a conductive filler including agglomerates, particles, powders, flakes, coated nickel particles, and coated glass spheres, having size and surface characteristics that maintain stable electrical contact by forming a moisture resistant contact with an electrical component lead. The carrier having a volumetric shrinkage between the uncured and cured states of greater than about 6.8% (vol) appears to effect a compaction of the filler particles causing the particles to be forced into enhanced electrical contact with the surfaces to be connected and to provide a measure of compaction between the particles themselves to enhance particle-to-particle conduction. The shrinkage of the polymeric carrier during curing places the interior particles under compression with sufficient force to urge the particles into engagement with one another as well as to cause the particles to penetrate non-conductive oxides that may be present on a component lead.
Abstract:
An anisotropically conductive adhesive composition (10) for use in electrically connecting at least one conductive area (14) on one substrate (12) with at least one conductive area (20) on a second substrate (18). The composition (10) is comprised of a mixture of conductive particles and a nonconductive adhesive binder (26). The conductive particles are dispersed throughout the binder in a plurality of noncontiguous conductive units (24) such that, upon applying a layer (30) of the composition (10) over both the conductive and insulating areas (14, 16) on the substrate (12) and positioning in a conductive relationship and adhering said at least one conductive area (20) on the second substrate (18) with said at least one conductive area (14) on the first substrate (12), the units (24) establish electrical connection between the adhered conductive areas (14, 20) on the two substrates (12, 18). The units (24) are sufficiently spaced apart, however, to preclude electrical conductivity between adjacent areas on the same substrate. A method for electrically connecting conductive areas on two substrates by means of said anisotropically conductive adhesive composition (10) and products produced by said method are also disclosed.
Abstract:
Provided is a curable composition for an electronic component that can be quickly cured and furthermore can have increased storage stability. The curable composition for an electronic component according to the present invention contains an epoxy compound, an anionic curing agent, a flux, and a basic compound excluding the anionic curing agent.
Abstract:
A semiconductor device including: a semiconductor chip including a substrate, an outer-connection electrode, and a bump, wherein the bump has a first conductive layer and a second conductive layer provided on the first conductive layer, and the second conductive layer is made of copper; a wiring board having a land; and an insulating material dispersed with conductive particles, wherein the conductive particles connect between the bump and the land, wherein an electrical connection is established by the conductive particles having penetrated to both the second conductive layer and the land.