Production of electroconductive particles, used for filling electroconductive, e.g. thixotropic dispersion, such as lacquer or adhesive for shield, heat management or ink-jet printing, involves depositing silver on inorganic particles.

: Aberle, L.; Born, E.; Kleemeier, M.; Staude, W.

Abstract
WO2003023787 A UPAB: 20060310 NOVELTY - Production of electroconductive particles (I), especially for incorporation in liquid media, comprises depositing silver (Ag) on particles of inorganic material (II). DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) (I), which are dispersible in liquid media; (2) Sedimentation-stable, electroconductive dispersions of (I) in a liquid medium. USE - The particles are used as fillers for the production of sedimentation-stable, electroconductive dispersions, preferably thixotropic dispersions (all claimed). These dispersions are useful as lacquers or adhesives for shielding active or passive devices; electroconductive and heat-conducting bonds in electrical and electronic applications; heat management of groups with active devices; and ink-jet printing of wiring traces in microsystems. ADVANTAGE - The particles are completely dispersible in liquid media. The dispersions are sedimentation-stable and can also bethixotropic. Using particles coated with silver minimizes the amount of metal needed to attain electrical conductivity. If coated pyrogenic silica is used, dispersions with low viscosity can be made, which are especially suitable for ink-jet printing wiring traces in microsystems.