Patent ID: 7906378

Claim:
An epoxy resin composition for encapsulating a semiconductor element, comprising: phenol aralkyl type epoxy resin; a curing agent; at least one kind of an inorganic filler selected from the group consisting of silicates of talc and calcined clay, oxides of silica and fused silica, and hydroxides of aluminum hydroxide and magnesium hydroxide, wherein the inorganic filler includes coarse particles having a particle size of 105 μm or more, and an amount of the coarse particles is 1% or less; and a pH buffer agent having a pH buffer area of pH 4 to 8, wherein the pH buffer agent is hydrotalcite represented by the following chemical formula: Mg 3 ZnAl 2 (OH) 12 (CO 3 ) mH 2 O and m is an integer of 0 or more, and the specific surface area of the hydrotalcite is in the range of 35 to 60 m 2 /g.