Patent ID: 9187649
Filing Date: 2015-11-17
Classification: C08L,C09D,H03K

Abstract:
1. A capacitive switch circuit comprising a dielectric barrier layer formed from a polymer thick film moisture barrier layer dielectric composition consisting essentially of: (a) a first organic medium comprising 10-50 wt % thermoplastic urethane resin dissolved in an organic solvent, wherein the weight percent is based on the total weight of said first organic medium; (b) a second organic medium comprising 10-50 wt % thermoplastic phenoxy resin in an organic solvent wherein the weight percent is based on the total weight of said second organic medium; (c) 1-20 wt % diacetone alcohol, wherein the weight percent is based on the total weight of the composition; and (d) 0.1-5.0 wt % fumed silica, wherein the weight percent is based on the total weight of the composition, wherein said capacitive switch circuit is thermoformed and subsequently subjected to an injection molding process.