Patent ID: 8324326

Claim:
An epoxy resin composition for encapsulating a semiconductor chip comprising (A) a crystalline epoxy resin, (B) a phenol resin represented by general formula (1): wherein R1 and R2 are independently hydrogen or alkyl having 1 to 4 carbon atoms and two or more R1s or two or more R2s are the same or different; a is integer of 0 to 4; b is integer of 0 to 4; c is integer of 0 to 3; and n is average and is number of 0 to 10, (C-2) a carboxyl-terminated butadiene-acrylonitrile copolymer in the amount of 0.05 wt % to 0.5 wt % both in the total epoxy resin composition, and (D) an inorganic filler in the amount of 80 wt % to 95 wt % both inclusive in the total epoxy resin composition, wherein the carboxyl-terminated butadiene-acrylonitrile copolymer is represented by general formula (3): and wherein Bu represents a butadiene-derived structural unit; ACN represents an acrylonitrile-derived structural unit; x is positive number of less than 1; y is positive number of less than 1; x+y=1; and z is integer of 50 to 62.