Patent ID: 7413771
Filing Date: 2008-08-19
Classification: B22F,B23K,G03G,H05K,Y10T

Abstract:
1. A method for preparing solder metal particles to retain a charge such that the particles are rendered electrostatically or electrokinetically mobile, the method comprising: coating solder metal particle bodies with a coating medium which facilitates attachment of a charge director material, wherein (1) the solder metal particle bodies consisting essentially of a metal/alloy selected from the group consisting of Sn, Sn/Pb, Sn/Ag/Cu, Sn/Ag, Cu, Sn/Ag/Bi, Sn/Bi, and Sn/Pb/Bi, (2) the coating medium is a polymeric material, to yield solder metal particles with the coating medium thereon; and contacting the solder metal particle bodies with the coating medium thereon with a charge director medium to impart a positive or negative charge thereto and thereby render the particles electrostatically or electrokinetically mobile.