Patent ID: 7413791

Claim:
A laminated sheet prepared by piling a prepreg and copper foil(s) one over the other under heat-pressing, wherein the prepreg is prepared by impregnating a poly(phenylene ether) resin composition into a substrate and semi-curing a resulting impregnated substrate, wherein the poly(phenylene ether) resin composition comprises a poly(phenylene ether) and a crosslinking curing agent, wherein the polyphenylene ether is represented by the following formula (I), and the number averaged molecular weight thereof is in a range of 1,000 to 7,000 wherein, X is an aryl group; (Y) m is a polyphenylene ether moiety; m is an integer of 1 to 100; Z is a para- or meta-phenylene group, an oxygen atom or a sulfur atom; and when Z is a oxygen atom or a sulfur atom, n is an integer of 1 to 6; when Z is a para- or meta-phenylene group, n is 1; R 1 to R 3 each independently is a hydrogen atom, an alkyl group, an alkenyl group or alkynyl group; and q is an integer of 1 to 4.