Patent ID: 6214905
Filing Date: 2001-04-10
Classification: C08G,C08K,C08L,H01L

Abstract:
An epoxy mold compound for encapsulating semiconductors comprising:from about 5 to 15 weight percent of a tris-phenolmethane multifunctional epoxy resin;from about 2.5 to 8 weight percent of a tris-phenolmethane multifunctional phenolic hardener;from about 70 to about 85 weight percent fused silica blend which includes both spherical and crushed silica particles wherein the fused silica blend includes at least one angular filler and one spherical filler, and wherein the fused silica blend includes between about 20 and 45 weight percent crushed silica, between about 5 and 25 weight percent of a spherical silica filler having an average particle diameter of less than 2 microns, and between about 20 and 35 weight percent of a spherical silica filler having an average particle diameter of greater than 20 microns;from about 0.25 to about 3 weight percent spherical silicone rubber powder; andless than 0.25 weight percent organofunctional silicone fluid.