Patent ID: 7629398

Claim:
An epoxy resin composition which comprises (A) an epoxy resin comprising at least one epoxy resin selected from the group consisting of (a1) a biphenyl epoxy resin and (a2) a phenol aralkyl epoxy resin having a skeleton structure of biphenylene, (B) a phenol resin comprising at least one phenol resin selected from the group consisting of (b1) a phenol aralkyl resin having a skeleton structure of phenylene and (b2) a phenol aralkyl resin having a skeleton structure of biphenylene, (C) a curing accelerator, (D) an inorganic filler, (E) at least one of (e1) a butadiene-acrylonitrile copolymer having carboxyl group and (e2) a reaction product of (e1) a butadiene-acrylonitrile copolymer having carboxyl group with an epoxy resin, wherein component (e1) is present in the entire epoxy resin composition in an amount of 0.01% by weight to 1% by weight and (F) at least one of (f1) an organopolysiloxane having a carboxyl group and (f2) a reaction product of (f1) an organopolysiloxane having a carboxyl group with an epoxy resin, wherein component (f1) is present in the entire epoxy resin composition in an amount of 0.01% by weight to 3% by weight.