Patent ID: 7851564

Claim:
A silicone resin composition comprising: a) an alkenyl group-containing polysiloxane represented by a following average composition formula “A”: R n SiO (4-n)/2 (SiO 2 ) A wherein R consists of an alkenyl group of 0.1 to 95 mole % and an alkyl group having 1 to 4 carbon atoms; and n is an integer of 1 to 3, and wherein at least one of the hydrogen atoms in the R is substituted by a heteroatom selected from the group consisting of a halogen atom, Si atom, O atom, N atom, and S atom, the alkenyl group-containing polysiloxane having a weight average molecular weight of 400 to 30000 and including 20 to 80 mole % of a Q unit represented by a following formula: b) a hydro group-containing polysiloxane represented by a following average composition formula “B”: R′ m SiO (4-m)/2 (SiO 2 ) B wherein R′ consists of a hydro group of 0.1 to 95 mole % and an alkyl group having 1 to 4 carbon atoms; and m is an integer of 1 to 3, the hydro group-containing polysiloxane having a weight average molecular weight of 100 to 10000 and including 10 to 50 mole % of the Q unit represented by the aforementioned formula: and c) a pair of polysiloxane each having opposite ends sealed with a vinyl group, differing in a range of “k” and represented by a following average composition formula “C”: wherein R 1 s may be same or different and are individually selected from an alkyl group having 1 to 4 carbon atoms; and k is 20 to 300 or 700 to 1200; and d) a hydrosilylating catalyst.