Dielectric composite
AssigneeRogers Corporation
InventorsDavid J. Arthur, Gwo S. Swei, Phong X. Nguyen
Life of this patent
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Abstract
A composite material is disclosed. The material comprises a polymeric matrix and from about 20 volume percent to about 70 volume percent inorganic particles distributed throughout the matrix. Suitable inorganic particles include hollow inorganic microspheres and porous inorganic particles. The inorganic particles are coated with a surface coating. The composite material of the present invention exhibits a dielectric constant of less than about 2.5 and a thermal coefficient of expansion of less than about 70 ppm/.degree.C.
Claims34
A composite material, comprising:
- a polytetrafluoroethylene fluoropolymer matrix;
- from about 20 volume percent to about 70 volume percent first coated inorganic particles distributed throughout the matrix in a paste extrusion or calendering process, said first coated inorganic particles comprising hollow inorganic microspheres;
- and
- a hydrophobic coating on the microspheres;
- wherein the composite material exhibits a dielectric constant of less than about 2.5 and a thermal coefficient of expansion of less than about 70 ppm/.degree.C.
An electrical substrate material comprising:
- a polytetrafluoroethylene fluoropolymer matrix;
- from about 20 volume percent to about 70 volume percent first coated inorganic particles distributed throughout the matrix in a paste extrusion or calendering process, said first coated inorganic particles comprising hollow inorganic microspheres;
- and
- a hydrophobic coating on the microspheres;
- wherein the electrical substrate material exhibits a dielectric constant of less than about 2.5 and a thermal coefficient of expansion of less than about 70 ppm/.degree.C.
A composite material, consisting essentially of:
- a polytetrafluoroethylene fluoropolymer matrix;
- from about 20 volume percent to about 70 volume percent first coated inorganic particles distributed throughout the matrix in a paste extrusion or calendering process, said first coated inorganic particles comprising hollow inorganic microspheres;
- and
- a hydrophobic coating on the microspheres;
- wherein the composite material exhibits a dielectric constant of less than about 2.5 and a thermal coefficient of expansion of less than about 70 ppm/.degree.C.
An electrical substrate material consisting essentially of:
- a polytetrafluoroethylene fluoropolymer matrix;
- from about 20 volume percent to about 70 volume percent first coated inorganic particles distributed throughout the matrix in a paste extrusion or calendering process, said first coated inorganic particles comprising hollow inorganic microspheres;
- and
- a hydrophobic coating on the microspheres;
- wherein the electrical substrate material exhibits a dielectric constant of less than about 2.5 and a thermal coefficient of expansion of less than about 70 ppm/.degree.C.
Dependencies are inferred from the claim text.