Patent ID: 6908960

Claim:
A double side metal-clad composite dielectric substrate, prepared by placing a prepreg between a pair of metal foils, followed by laminating press, and wherein the prepreg is prepared by dispersing a polyvinylbenzyl ether compound and a dielectric ceramic powder in a solvent to form a slurry, applying the slurry to a cloth base, and drying, and wherein the content of the dielectric ceramic powder is from 10 to 65 vol %, based on the dielectric ceramic powder and the polyvinylbenzyl ether compound combined, and wherein the polyvinylbenzyl ether compound has the following formula (1): wherein R 1 denotes methyl or ethyl, R 2 denotes hydrogen or a hydrocarbon group of 1 to 10 carbon atoms, R 3 denotes hydrogen or a vinylbenzyl group in a molar ratio of hydrogen to vinylbenzyl of from 60:40 to 0:100, and n is a number from 2 to 4.