Patent ID: 8193269

Claim:
A silicone resin composition, comprising (A) 100 parts by mass of an organopolysiloxane having a weight average molecular weight of from 500 to 20000, reduced to polystyrene, and represented by the following average compositional formula (1), (CH 3 ) a Si(OR 1 ) b (OH) c O (4-a-b-c)/2 (1) wherein R 1 is a monovalent hydrocarbon group having 1 to 4 carbon atoms and a, b, and c are numbers satisfying the equations: 0.8<=a<=1.5, 0<=b<=0.3, 0.001<=c<=0.5, and 0.801<=a+b+c<2, (B) 3 to 200 parts by mass of a white pigment, (C) 400 to 1000 parts by mass of an inorganic filler other than the afore-mentioned white pigment, (D) 0.01 to 10 parts by mass of a condensation catalyst, (E) 1.0 to 10 parts by mass of an epoxy resin which is a derivative of isocyanuric acid, (F) 2 to 50 parts by mass of an organopolysiloxane comprising unit R 2 SiO and unit RSiO 1.5 , wherein R may be same or different and is a group selected from the group consisting of a hydroxyl group, a methyl group, an ethyl group, a propyl group, a cyclohexyl group, a phenyl group, a vinyl group and an allyl group, wherein at least a part of the afore-mentioned unit R 2 SiO repeats itself in series and the number of the repetition is 5 to 100, and wherein 0.5 to 10 mole % of the siloxane units comprising unit R 2 SiO and unit RSiO 1.5 has a silanol group, and (G) 2 to 50 parts by mass of a linear dioraganopolysiloxane represented by the following formula (2), wherein R 5 and R 6 are, independently of each other, selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, a cyclohexyl group, a vinyl group, a phenyl group and an allyl group and n is an integer of from 800 to 1200.