Patent ID: 8883913

Claim:
A resin composition comprising the following components (A), (B), and (C): (A) a silicone resin containing repeating units represented by the following formulae (1-1), (1-2), and (1-3) and having a weight average molecular weight as measured by GPC in terms of polystyrene using tetrahydrofuran for elution solvent of 3,000 to 500,000, wherein r, s, and t are independently a positive integer; the silicon atom at the terminal of the units constituting the repeating units represented by the formulae (1-1), (1-2), and (1-3) is bonded to the terminal carbon atom of the X 1 , X 2 , or X 3 in the same or different unit; R 1 is independently a monovalent hydrocarbon group containing 1 to 8 carbon atoms; X 1 is independently a divalent group represented by the following formula (2): wherein Z is a substituted or unsubstituted divalent hydrocarbon group containing 1 to 15 carbon atoms, and p is 0 or 1, R 2 is independently an alkyl group or an alkoxy group containing 1 to 4 carbon atoms, and q is 0, 1, or 2; X 2 is independently a divalent group represented by the following formula (3): wherein R 3 is hydrogen atom, monovalent hydrocarbon group containing 1 to 8 carbon atoms, or a glycidyl group; and X 3 is independently a divalent group represented by the formula (4): wherein R 4 is independently a monovalent hydrocarbon group containing 1 to 8 carbon atoms, and n an integer of 0 to 100; (B) a thermosetting resin; and (C) a filler.