Abstract: A dielectric substrate comprises a resin composition impregnated with non-woven fibrous mat material having a thickness of 5 mils (127 micrometers), wherein the fibrous mat material comprises fibers, having a diameter of 1 nm to 10 ?m, that have been extruded through one or more openings to produce fibers that have been collected in the form of a fibrous non-woven mat, and wherein the fibers exhibit a multi-directional orientation in the non-woven mat material. The dielectric substrate is useful in circuit materials, circuits, and multi-layer circuits, economical to make, and has excellent electrical and mechanical properties.

Abstract: A dielectric substrate comprises a resin composition impregnated with non-woven fibrous mat material having a thickness of 5 mils (127 micrometers), wherein the fibrous mat material comprises fibers, having a diameter of 1 nm to 10 ?m, that have been extruded through one or more openings to produce fibers that have been collected in the form of a fibrous non-woven mat, and wherein the fibers exhibit a multi-directional orientation in the non-woven mat material. The dielectric substrate is useful in circuit materials, circuits, and multi-layer circuits, economical to make, and has excellent electrical and mechanical properties.

Abstract: A thermal management circuit material comprises an electrically conductive layer; a dielectric layer comprising a polymer matrix and a thermally conductive, electrically non-conductive particulate filler, wherein the dielectric layer is disposed on and in at least partial contact with the electrically conductive layer, and wherein the circuit material has a thermal conductivity of greater than or equal to about 1 watt per meter-degree Kelvin.