Patent ID: 8535809

Claim:
A laminate for a circuit board comprising: an electrical insulating layer obtained by curing an electrical insulating resin composition; and metal layers on both sides of said electrical insulating layer, one of said metal layers being a metal substrate, and the other metal layer being a metal foil for forming wiring; wherein said electrical insulating resin composition comprises: a partially hydrogenated rubber polymer compound (D) that is a partial hydrogenation product of a rubber polymer compound (A) composed of a copolymer of an aromatic vinyl compound and a conjugated diene compound, said compound (A) having a molecular weight Mw of 30,000 to 300,000; a polymerizable monomer (B) having one or more terminal reactive double bonds and having a molecular weight Mw of 100-350; an oligomer (C) having an alicyclic ring structure and having a reactive unsaturated bond in the molecule thereof and having a molecular weight Mw of 400-1000, wherein said oligomer (C) is selected from the group consisting of: a dicyclopentadiene petroleum resin; and a copolymer of a compound selected from the group consisting of 5-ethylidene-2-norbornene, and dicyclopentadiene, and a compound selected from 1,4-hexadiene, isobutylene, 1,3-pentadiene, and a mixture of C5 distillate fraction diene unsaturated compounds; a thermal conductive inorganic filler (E), an organic peroxide; and, a solvent; wherein the content of said thermal conductive inorganic filler (E) in said composition ranges from 40 to 90 vol %.