Patent ID: 6645630
Filing Date: 2003-11-11
Classification: C08G,C08K,H05K,Y10S,Y10T

Abstract:
An epoxy resin composition comprisinga phosphorus compound component having an average per molecule of not less than 1.8 and less than 3 phenolic hydroxy groups reactive with an epoxy resin and an average per molecule of not less than 1 phosphorus atom, an inorganic filler having an average particle diameter of not greater than 30 &mgr;m, a bifunctional epoxy resin having an average per molecule of not less than 1.8 and less than 2.6 epoxy groups, and a curing agent, wherein the epoxy resin composition comprises not less than 51% by mass of the bifunctional epoxy resin, the curing agent comprises dicyandiamide, and a ratio (a/c) of equivalent (a) of a phenolic hydroxy group of the phosphorus compound component to equivalent (c) of an epoxy group of the bifunctional epoxy resin is not less than 0.3 and less than 0.75.