Patent ID: 7405247

Claim:
A reworkable conductive adhesive composition comprising: an epoxy based conductive adhesive containing conductive filler particles dispersed in a solvent-free hybrid epoxy polymer matrix to form a screenable conductive adhesive paste; wherein: said solvent-free hybrid epoxy polymer matrix comprises: a liquid epoxy precursor having a siloxane linkage and carrying an acyclic or alicyclic chain segment; a solid or liquid anhydride or an amine curing additive; an epoxy curing catalyst; and a polymer additive completely miscible in said epoxy precursor; wherein: said liquid epoxy precursor is a soluble mixture of 1,3-bis(glycidoxypropyl) tetramethyl disiloxane; said anhydride curing additive is HHPA, or a mixture of HHPA and MeHHPA; said epoxy curing catalyst is a combination of nonylphenol, ethylene glycol, and 2,4,6-tris(dimethylamino-methyl)phenol as a tertiary amine; said conductive filler particles are Au-coated Ag, Pd-coated Ag filler, Ag flake, or a combination thereof; and said polymer additive is oligomeric ABA-glycidyl methacrylate diester.