Patent ID: 7348045
Filing Date: 2008-03-25
Classification: C09K,H05K,Y10T

Abstract:
1. A flexible circuit for use in a touch sensor, said circuit comprising: a dielectric film comprising a polymer selected from the group consisting of liquid crystal polymers and polyimide copolymers including carboxylic ester structural units in the polymeric backbone, said dielectric film having an initial thickness from about 25 μm to about 60 μm including at least one recessed region that will form a touch sensitive membrane wherein said thickness of said recessed region is reduced to a controlled depth of less than 15 μm, wherein said polyimide copolymers comprise the reaction product of monomers including p-phenylene bis(trimellitic acid monoester anhydride) and wherein said liquid crystal polymers are selected from the group consisting of copolymers containing p-phenyleneterephthalamide and copolymers containing p-hydroxybenzoic acid.