Patent ID: 7416996

Claim:
A method of making a circuitized substrate, said method comprising: providing a first dielectric layer including a high glass transition temperature, dicyandiamide-free epoxy resin material and a high molecular weight thermoplastic resin material and a filler comprised of particles having a size within the range of from about 200 Angstroms to about 35 microns, said particles comprising from about 10 percent to about 80 percent by volume of said first dielectric layer, said first dielectric layer not including continuous or semi-continuous fibers as part thereof, said first dielectric layer having a dielectric constant within the range of from about 3.5 to about 4.0; forming a plurality of conductive thru-holes within said first dielectric layer having a pattern density of from about 5,000 to about 10,000 holes per square inch of said first dielectric layer; and positioning at least one circuitized layer on said first dielectric layer.