Patent ID: 8653205

Claim:
A resin composition for encapsulating a semiconductor containing an epoxy resin (A), a curing agent (B) and an inorganic filler (C), wherein: said epoxy resin (A) comprises an epoxy resin (A1) having a structure represented by the following general formula (1), said curing agent (B) comprises a phenol resin (B1) represented by the following general formula (2), the content of a c=1 component contained in the total amount of the phenol resin (B1) represented by the general formula (2) is not less than 40% in terms of area percentage, the content of a C≧4 component is not more than 20% in terms of area percentage, as measured by the area method of gel permeation chromatography, and said epoxy resin (A1) has a melting point, and when melting point is T A1 , and the softening point of said phenol resin (B1) is T B1 , the absolute value |T A1 -T B1 | of a temperature difference between T A1 and T B1 is not more than 35 degrees centigrade; wherein, in the above general formula (1), each of R1 and R3 is a hydrocarbon group having 1 to 5 carbon atoms, which are the same or different from each other; R2 represents any of a direct bond, a hydrocarbon group having 1 to 5 carbon atoms, —S— and —O—; and each of a and b is an integer of 0 to 4, which are the same or different from each other, wherein, in the above general formula (2), c is an integer of 0 to 20.