Patent ID: 7696286

Claim:
A resin composition for semiconductor encapsulation, comprising: (A) an epoxy resin; (B) a phenolic compound containing two or more phenolic hydroxyl groups; (C) an inorganic filler; and (D) a curing accelerator; wherein the epoxy resin (A) comprises an epoxy resin (a1) represented by the formula (1), and the resin composition has a moisture absorption rate of 0.22 weight % or less when the composition is humidified at 85° C. and 85% R.H. for 168 hours: wherein Ar represents an aryl group having 6 to 20 carbon atoms; R1's each represent a hydrocarbon group having 1 to 6 carbon atoms and may be the same or different; R2 represents a hydrocarbon group having 1 to 4 carbon atoms; W1 represents an oxygen or sulfur atom; R0's each represent a hydrocarbon group having 1 to 6 carbon atoms and may be the same or different; a is an integer of 0 to 10; g is an integer of 0 to 3; and m and n represent molar ratios and satisfy 0<m<1, 0<n<1, m+n=1, and the ratio m/n=1/10 to 1/1.