Patent ID: 7498085

Claim:
An epoxy/silicone mixed resin composition comprising (A′) a combination of an organopolysiloxane having the following general compositional formula (1): R 1 a R 2 b (OH) c (R 3 O) d SiO (4-a-b-c-d)/2 (1) wherein R 1 is each independently a substituted or unsubstituted monovalent hydrocarbon group having aliphatic unsaturation, R 2 is each independently a substituted or unsubstituted monovalent hydrocarbon group free of aliphatic unsaturation, R 3 is each independently a substituted or unsubstituted monovalent hydrocarbon group free of aliphatic unsaturation, 0.001≦a≦0.5, 0≦b≦2.2, 0.001≦c≦0.5 0≦d≦0.5, and 0.8≦a+b+c+d≦3, the organopolysiloxane containing CH 3 SiO 3/2 unit and/or C 6 H 5 SiO 3/2 unit, and an organopolysiloxane having the following structural formula: wherein k, m and n are positive numbers, and the sum of k+m+n is such a number that the organopolysiloxane has a viscosity of about 10 to 1,000,000 mPa·s as measured at 25° C. by a viscosity measurement method using a rotary viscometer of BM type, (B) an epoxy resin containing at least one epoxy group per molecule, (C) an organohydrogenpolysiloxane, (D) a platinum group metal-based catalyst, and (E) an aluminum-based curing catalyst.