Patent ID: 7095125

Claim:
A semiconductor encapsulating flame retardant epoxy resin composition which is free of halogenated epoxy resins and of antimony compounds, said composition comprising: (A) an epoxy resin, (B) a phenolic resin curing agent, (C) zinc molybdate supported on an inorganic carrier, (D) at least one organopolysiloxane (D-iii) block copolymer obtained by reacting an epoxy resin or an alkenyl group-bearing epoxy resin with an organopolysiloxane of the following average compositional formula (2): H m R 2 n SiO (4−m−n)/2 (2) wherein R 2 is a substituted or unsubstituted monovalent hydrocarbon group, m is a positive number of 0.001 to 0.2, n is a positive number of 1.8 to 2.1, and m+n is 1.801 to 2.3, the number of silicon atoms in a molecule is an integer of 10 to 1000, and the number of hydrogen atoms directly attached to silicon atoms is 1 to 5, addition reaction taking place between epoxy groups on the epoxy resin or alkenyl groups on the alkenyl group-bearing epoxy resin and silicon-attached hydrogen atoms on the organopolysiloxane, and (E) an inorganic filler.