Patent ID: 8269213

Claim:
A sheet-form epoxy resin composition for semiconductor encapsulation comprising the following components (A) to (D), wherein the epoxy resin composition has a reaction exothermic peak temperature of 150° C. to 200° C. as measured by a differential scanning calorimeter with heating at a temperature increase rate of 10° C./min, and has a reaction exothermic calorific value accounting for not less than 80% of a total reaction exothermic calorific value as measured within a temperature range of the reaction exothermic peak temperature±30° C., (A) an epoxy resin having at least two epoxy groups in a molecule thereof; (B) a compound having at least two phenolic hydroxyl groups in a molecule thereof; (C) a powder of a compound represented by the following general formula (1), the powder having a maximum particle diameter of not greater than 30 μm and a standard deviation of not greater than 5 μm, the powder being dispersed in the epoxy resin composition: wherein X 1 to X 5 , which may be the same or different, are each a hydrogen atom, an alkyl group having 1 to 9 carbon atoms, or a fluorine atom; and (D) a thermoplastic resin, the proportion of the thermoplastic resin is 1 to 60 wt % based on the total weight of the organic resin component.