Patent ID: 8008410

Claim:
An epoxy resin composition for encapsulating a semiconductor comprising an epoxy resin (A), wherein the epoxy resin (A) includes: a crystalline epoxy resin (a1) having a melting point of 50° C. to 150° C., an epoxy resin (a2) represented by formula (1), and at least one epoxy resin (a3) selected from an epoxy resin represented by formula (2) and an epoxy resin represented by a formula (3), wherein the epoxy resin (a1) is different from the epoxy resin (a2) and the epoxy resin (a3); wherein the composition has a spiral flow of 80 cm or more measured according to EMMI-1-66 method; the composition in the cured state has a glass transition temperature of 150° C. or higher; and the composition in the cured state has a linear expansion coefficient of 5 ppm/° C. to 10 ppm/° C., at a temperature not higher than the glass transition temperature of the composition: wherein, in formula (1), R1's which may be the same or different, represent a hydrocarbon group having 1 to 4 carbon atoms; R2's, which may be same or different, represent a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms; and n is an integer of 0 to 6; wherein, in formula (2), R1's, which may be same or different, represent a hydrocarbon group having 1 to 4 carbon atoms; R2's, which may be the same or different, represent a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms; m is an integer of 0 to 5; and n is an integer of 0 to 6; wherein, in formula (3), R1's which may be the same or different, represent a hydrocarbon group having 1 to 4 carbon atoms; R2's, which may be the same or different, represent a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms; and m is an integer of 0 to 5, and wherein the epoxy resin (a1) is in an amount of 60 wt % to 95 wt % based on the total amount of the epoxy resin (a1), the epoxy resin (a2), and the epoxy resin (a3).