Patent ID: 8692131

Claim:
A capacitive switch circuit comprising a dried encapsulant layer covering a dried polymer thick film conductive composition, said polymer thick film conductive composition comprising (a) 30-70 wt % silver; (b) 10-40 wt % first organic medium comprising 110-50 wt % thermoplastic urethane resin dissolved in a first organic solvent, wherein the weight percent of the thermoplastic urethane resin is based on the total weight of the first organic medium; and (c) 10-40 wt % second organic medium comprising 10-50 wt. % thermoplastic polyhydroxyether resin dissolved in a second organic solvent wherein the weight percent of the thermoplastic polyhydroxyether resin is based on the total weight of the second organic medium; wherein the weight percent of said silver, said first organic medium and said second organic medium are based on the total weight of said polymer thick film conductive composition and wherein said polymer thick film conductive composition is dried before said encapsulant layer comprising the same polymers in the same ratios as present in said polymer thick film conductive composition is deposited and dried.