Patent ID: 8022137
Filing Date: 2011-09-20
Classification: C08G,C08K,C08L,H01L

Abstract:
1. A silicone resin composition for an optical semiconductor device, 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), wherein R 1 is an organic 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 said white pigment, (D) 0.01 to 10 parts by mass of a condensation catalyst, and (E) 2 to 50 parts by mass of an organopolysiloxane comprising a linear diorganopolysiloxane moiety represented by the following formula (2), wherein R 2 and R 3 are, independently of each other, a group selected from the group consisting of a hydroxyl group, an alkyl group having 1 to 3 carbon atoms, a cyclohexyl group, a vinyl group, a phenyl group and an allyl group, and wherein m is an integer of from 5 to 50, and an RSiO 3/2 unit, an R 3 SiO 1/2 unit, and an R 2 SiO 2/2 unit other than the aforesaid linear diorganopolysiloxane moiety, wherein the mole ratio of RSiO 3/2 unit:R 3 SiO 1/2 unit:R 2 SiO 2/2 unit other than the aforesaid linear diorganopolysiloxane moiety is 90-24: 75-0: 50-1, and R is, independently of each other, 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.