Patent ID: 8828543

Claim:
A conductive particle comprising: a polymer resin base particle; and a conductive complex metal plating single layer comprising at least two metals formed by simultaneous electroless plating of said at least two metals on the surface of the base particle, wherein the conductive complex metal plating single layer comprises: a first density gradient including one of the at least two metals and extending from the surface of the base particle toward an outer portion of the conductive complex metal plating single layer, wherein the concentration of said one of the at least two metals continuously increases in a direction extending vertically away from the surface of the base particle; and a second density gradient including the other of the at least two metals and also extending from the surface of the base particle toward an outer portion of the conductive complex metal plating single layer, wherein the concentration of the other of the at least two metals initially increases and then decreases in a direction extending vertically away from the surface of the base particle, wherein the concentration of both of the metals increases along at least a portion of the complex metal plating single layer.