Patent ID: 7671146

Claim:
An epoxy resin composition for encapsulating a semiconductor comprising (A) an epoxy resin represented by general formula (1), wherein a binuclear compound (a component in which n=1 in general formula (1)) is contained in a ratio of 60% to 100% both inclusive as determined by a GPC area ratio, and a binuclear compound in which the bis(phenylmethyl) moiety is attached at the para position to both binding positions of the glycidyl ether groups in two phenyl glycidyl ethers is contained in a ratio of 35% to 100% both inclusive to the total amount of the binuclear compounds as determined by an NMR area ratio; (B) a curing agent having two or more phenolic hydroxy groups in one molecule; (C) an inorganic filler; and (D) a curing accelerator, and being substantially free from a halogen-containing compound or antimony compound; wherein R1 and R2, which may be the same or different, represent alkyl having 1 to 4 carbons; a is an integer of 0 to 3; b is an integer of 0 to 4; n is an integer of 1 to 5; and G is glycidyl.