Patent ID: 8084520
Filing Date: 2011-12-27
Classification: C08K,C08L,H01L,Y10T

Abstract:
1. An epoxy resin composition for semiconductor encapsulating, comprising: an epoxy resin represented by a formula, wherein R 1 , R 2 , R 3 , and R 4 are individually a hydrogen atom or an alkyl group having 1-4 carbon atoms; a and d are individually integers of 0-3; b and c are individually integers of 0-4; and m is an average of positive numbers; a phenol resin represented by a formula, wherein R 5 , R 6 , R 7 , and R 8 are individually a hydrogen atom or an alkyl group having 1-4 carbon atoms; e and h are individually integers of 0-3; f and g are individually integers of 0-4; and n is an average of positive numbers; a curing accelerator; silica, wherein 70 wt % or more of the silica has an average particle size of 25 μm or less; and alumina and aluminum hydroxide, wherein the amount of aluminum to the total amount of said epoxy resin composition is 0.25-5 wt %, the alumina and aluminum hydroxide have an average particle size of 1 to 25 μm, an amount of the alumina and aluminum hydroxide with a diameter of 75 μm or more is 2 wt % or less, and an amount of the alumina and aluminum hydroxide with a diameter of 64 μm or more is 20 wt % or less, wherein the epoxy resin of the formula is in an amount of 100 wt % of the total epoxy resin amount, and the phenol resin of the formula is in an amount of 100 wt % of the total phenol resin amount.