Patent ID: 8557146
Filing Date: 2013-10-15
Classification: B22F,B23K,H01B,H01L,H05K,Y02E

Abstract:
1. A polymer thick film conductor composition comprising: (a) 35 to 94 wt % solder alloy powder selected from the group consisting of (i) a tin, silver, and copper alloy powder, (ii) a tin and bismuth alloy powder, and (iii) mixtures thereof, said alloy powder consisting of particles possessing an average particle size of 2 to 18 μm and a surface area/mass ratio in the range of 0.20 to 1.3 m (b) 1 to 30 wt % metal selected from the group consisting of silver, copper, gold, aluminum and mixtures thereof, said metal consisting of particles possessing an average particle size of 2 to 18 μm and a surface area/mass ratio in the range of 0.10 to 2.3 m (c) 5 to 35 wt % organic medium comprising: with the proviso that if said resin is a phenoxy resin said metal is silver, wherein said solder alloy powder and said metal are dispersed in said organic medium and wherein the wt % are based on the total weight of the polymer thick film conductor composition.