Patent ID: 8569429

Claim:
A curable silicone resin composition comprising: (A) an alkenyl group-containing organopolysiloxane, comprising an organopolysiloxane (A1) represented by an average composition formula (1) shown below and containing at least two alkenyl groups per molecule: (R 1 SiO 3/2 ) a (R 2 2 SiO) b (R 3 R 4 2 SiO 1/2 ) c (1) wherein R 1 represents an alkyl group of 1 to 10 carbon atoms, R 2 represents an aryl group of 6 to 14 carbon atoms, R 3 represents an alkenyl group of 2 to 8 carbon atoms, each R 4 independently represents an alkyl group of 1 to 10 carbon atoms or an aryl group of 6 to 14 carbon atoms, a represents a number of 0.2 to 0.6, b represents a number of 0.2 to 0.6, and c represents a number of 0.05 to 0.5, provided that a+b+c=1.0, (B) an organohydrogenpolysiloxane represented by an average composition formula (2) shown below and containing at least two silicon atom-bonded hydrogen atoms per molecule: in an amount that yields a molar ratio of silicon atom-bonded hydrogen atoms within the component (B) relative to alkenyl groups bonded to silicon atoms that exist within the composition of 0.4 to 4.0: R 1 d R 2 e H f SiO (4-d-e-f)/2 (2) wherein R 1 and R 2 are as defined above, d represents a number of 0.6 to 1.5, e represents a number of 0 to 0.5, and f represents a number of 0.4 to 1.0, provided that d+e+f=1.0 to 2.5, and (C) a catalytically effective amount of an addition reaction catalyst.