Patent ID: 8822351

Claim:
A composition for a thermosetting silicone resin comprising: (1) a dual-end silanol type silicone oil; (2) an alkenyl-containing silicon compound; (3) an organohydrogensiloxane; (4) a condensation catalyst; and (5) a hydrosilylation catalyst, wherein the (3) organohydrogensiloxane comprises at least one kind selected from the group consisting of compounds represented by formula (III): wherein A, B, and C indicate constitutional units, A representing an end unit and B and C representing repeating units, R 3 represents a monovalent hydrocarbon group, a is an integer of 0 or larger, and b is an integer of 2 or larger, provided that all R 3 groups are either the same or different, and compounds represented by formula (IV): wherein R 4 represents a monovalent hydrocarbon group, and c represents an integer of 0 or larger, provided that all R 4 groups are either the same or different, and wherein the (4) condensation catalyst comprises a tin complex compound.