Patent ID: 8377544

Claim:
A copper-clad laminate of a highly-elastic glass fabric base material/thermosetting resin, comprising: at least one prepreg obtained by impregnating a glass fabric base material made of a glass woven fabric having a thickness of 25 to 150 μm, a weight of 15 to 165 g/m 2 and a gas permeability of 1 to 20 cm 3 /cm 2 /sec. with a thermosetting resin composition and drying it; and a copper foil placed on the surface of the prepreg, wherein a via hole, having a diameter of 0.15 mm or less, is perforated in the copper-clad laminate, wherein the thermosetting resin composition contains 10 to 80 wt% of an insulating inorganic filler, and wherein the thermosetting resin composition comprises a polyfunctional cyanate ester and a prepolymer of polyfunctional cyanate ester.