Vertically interconnected electronic assemblies and compositions useful therefor

A specialty via interconnect structure comprising:

• (i) an encapsulated metallized dielectric, wherein the encapsulant has been selectively removed from the metallized surface in a desired pattern, and
• (ii) via-posts formed from an electrically conductive composition within said encapsulant whereby said composition is electrically interconnected to said metallized surface, and wherein the electrically conductive composition comprises:
• 5-65% by volume of a high melting point metal,
• 5-60% by volume of a low melting point metal or metal alloy,
• 0-35% by volume of a binder,
• 2-60% by volume of a latent or chemically protected, cross-linking agent,
• 0-35% by volume of a reactive monomer or polymer, and
• 0-10% by volume of a metal additive,
• provided, however, that said composition must contain either said binder and/or said reactive monomer or polymer, or, in the alternative, said binder and/or said reactive monomer or polymer can be combined with said chemically protected crosslinking agent to produce a single component of said composition.

A specialty vertical interconnection assembly (via) structure comprising:

• (i) a metallized dielectric, and
• (ii) conductive adhesive posts, formed from an electrically conductive adhesive composition, in contact with said metallized dielectric in a desired via configuration, wherein the conductive adhesive composition comprises:
• 5-65% by volume of a high melting point metal,
• 5-60% by volume of a low melting point metal or metal alloy,
• 0-35% by volume of a resin,
• 2-60% by volume of a chemically protected, cross-linking agent,
• 0-35% by volume of a reactive monomer or polymer, and
• 0-10% by volume of a metal additive,
• provided, however, that said composition must contain either said binder and/or said reactive monomer or polymer, or, in the alternative, said binder and/or said reactive monomer or polymer can be combined with said chemically protected crosslinking agent to produce a single component of said composition.