Polymeric compositions having a temperature-stable dielectric constant
AssigneeHoechst Celanese Corporation
InventorsLak M. Walpita, Paul N. Chen, Sr., Harris A. Goldberg, Christopher Zipp
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Abstract
A polymeric composition having a high dielectric constant which varies little with temperature is made from a thermoplastic polymer, a high dielectric ceramic having a dielectric constant of at least about 50 at 1.0 Ghz and 20.degree. C., and a second ceramic material having a dielectric constant of at least about 5.0 at 1.0 GHz and 20.degree. C., where the high dielectric ceramic and the second ceramic material have temperature coefficients that are opposite in sign from one another.
Claims28
A polymeric composition having a high dielectric constant that varies little with temperature, comprising a thermoplastic polymer, a high dielectric ceramic, and a second ceramic material, wherein said high dielectric ceramic is selected from the group consisting of strontium titanate, barium neodymium titanate, and barium strontium titanate/magnesium zirconate, and said second ceramic material is mica, wherein said high dielectric ceramic and said second ceramic material are included in the polymeric composition in sufficient quantity that the dielectric constant of said polymeric composition is at least about 4.0 at 1.0 GHz.
A method of making a polymeric composition having a high dielectric constant with a reduced temperature coefficient, comprising the step of compounding a thermoplastic polymer, a high dielectric ceramic, a second ceramic material and optionally other additives, wherein said high dielectric ceramic is selected from the group consisting of strontium titanate, barium neodymium titanate, and barium strontium titanate/magnesium zirconate, and said second ceramic material is mica, wherein said high dielectric ceramic and said second ceramic material are included in the polymeric composition in sufficient quantity that the dielectric constant of said polymeric composition is at least about 4.0 at 1.0 GHz.
Dependencies are inferred from the claim text.