Liquid crystalline polymer composites having high dielectric constant
First Claim
1. A polymeric composition having a high dielectric constant comprising a thermotropic liquid crystalline polymer and a high dielectric ceramic in the form of fine particles having an average diameter of from about 0.2 to about 10 microns selected from the group consisting of SrTiO3, barium neodymium titanate, and mixtures thereof, wherein said high dielectric ceramic is included in an amount of at least about 30% by volume and in sufficient quantity that said composition has a dielectric constant of at least about 6.0 at a frequency of 1.0 GHz.
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Abstract
Polymeric compositions having a high dielectric constant are made from a thermotropic liquid crystalline and a ceramic having a dielectric constant which is greater than about 50 at a frequency of 1.0 GHz. The compositions have a dielectric constant of at least about 4, and preferably at least about 6. Preferred compositions also have a low loss tangent.
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Citations
23 Claims
- 1. A polymeric composition having a high dielectric constant comprising a thermotropic liquid crystalline polymer and a high dielectric ceramic in the form of fine particles having an average diameter of from about 0.2 to about 10 microns selected from the group consisting of SrTiO3, barium neodymium titanate, and mixtures thereof, wherein said high dielectric ceramic is included in an amount of at least about 30% by volume and in sufficient quantity that said composition has a dielectric constant of at least about 6.0 at a frequency of 1.0 GHz.
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9. A high dielectric constant laminate comprising:
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(a) a flat substrate comprising a polymeric composition having a high dielectric constant, said substrate having two surfaces, said polymeric composition comprising a thermotropic liquid crystalline polymer and a high dielectric ceramic in an amount of at least about 30% by volume and in the form of fine particles having an average diameter of from about 0.2 microns to about 10 microns selected from the group consisting of SrTiO3, barium neodymium titanate, and mixtures thereof; and (b) one or more layers of metal, each layer adhering to one surface of said substrate; wherein said laminate has a dielectric constant of at least about 6.0 at a frequency of 1.0 GHz. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of making a laminate having a high dielectric constant, comprising the steps of:
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(a) compounding a thermotropic liquid crystalline polymer and a ceramic in an amount of at least about 30% by volume and in the form of fine particles having an average diameter of from about 0.2 to about 10 microns selected from the group consisting of SrTiO3, barium neodymium titanate, and mixtures thereof to yield a polymeric composition having a dielectric constant of at least about 6.0 at 1.0 GHz; (b) shaping said polymeric composition to form a flat substrate; and (c) applying metal onto one or both surfaces of said substrate. - View Dependent Claims (16, 17, 18)
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Specification