Patent ID: 6737108
Filing Date: 2004-05-18
Classification: H01B,H01L,H05K

Abstract:
A process for the production of a microcapsule (MC) conductive filler comprising:(a) treating minute metallic particles with a coupling agent which forms a monomolecular layer on the surface of the minute metallic particles and can couple with a first monomer; (b) preparing an oil phase comprising the coupling agent-treated minute metallic particles and either both a solvent and said first monomer or said first monomer alone, the solvent and said first monomer or said monomer alone being present directly on the surface of the coupling agent-treated minute particles, said monomer having a solubility parameter which is different from that of said coupling agent by no more than 10(cal/cm3)1/2; (c) dispersing said oil phase in an aqueous phase which comprises a second monomer and has a viscosity in the range of between 20 and 10,000 cps to form a suspension of said oil phase in said aqueous phase; and (d) causing in situ polymerization of said first and second monomers, the suspension being stirred at a rate in the range of 50 and 250 rpm, the in situ polymerization forming a coating of a thermosetting insulating resin on the surface of said minute metallic particles.