Patent ID: 9660157
Date: 2017-05-23
CPC Classifications: C08G,C08L,C09J,H01L

Claim:
1. An addition-curable silicone resin composition comprising: (A-1) a linear organopolysiloxane having at least two alkenyl groups per molecule; (A-2) a branched organopolysiloxane of the average compositional formula (1) below which has at least two alkenyl groups per molecule wherein R 1 is independently an alkenyl group of 2 to 8 carbon atoms, R 2 is independently a substituted or unsubstituted monovalent hydrocarbon group of 1 to 12 carbon atoms which contains no aliphatic unsaturated bonds, each R 3 is independently R 1 or R 2 , with at least two of the R 3 groups on the molecule being R 1 , p, q, r and s satisfy the conditions 0.01≦p≦0.6, 0≦q, 0≦r and 0.1≦s≦0.9, with the proviso that p+q+r+s=1, and t satisfies the condition 0≦t<3; (B) an organohydrogenpolysiloxane of the average compositional formula (2) below which has a content of low-molecular-weight siloxane having a degree of polymerization of up to 10 and at least one SiH group per molecule of 5 wt % or less wherein each R 4 is independently a hydrogen atom or a methyl group, with at least two of all the R 4 groups being hydrogen atoms, each R 5 is independently a substituted or unsubstituted monovalent hydrocarbon group of 1 to 12 carbon atoms which contains no aliphatic unsaturated bonds, and a, b, c and d satisfy the conditions 0.01≦a≦0.6, 0≦b, 0≦c and 0.1≦d≦0.9, with the proviso that a+b+c+d=1, wherein said organohydrogenpolysiloxane has a viscosity at 25° C., as measured by the method described in JIS K 7117-1:1999, of at least 10 Pa·s; and (C) an addition reaction catalyst.