Patent ID: 7736749

Claim:
A thermosetting resin composition, which has a thermal expansion coefficient after having been set of 30×10 −6 /° C. or less, and comprises: a thermosetting resin having a resin-setting functional group; a setting agent; an inorganic filler, wherein the inorganic filler is incorporated at 100 parts by weight or more with respect to 100 parts by weight of the thermosetting resin; and an amine compound having two or more reactive functional groups per molecule; wherein the thermosetting resin is a thermosetting silicone polymer prepared by a process comprising: (1) subjecting a silane composition to hydrolysis and polycondensation, wherein said silane composition comprises: 35 to 100 mole percent of at least one silane compound of general formula (I) R′ m (H) k SiX 4-(m+k) (I) wherein X is a hydrolyzable and polycondensable group, R′ is a non-reactive group, the subscript k is 1 or 2, the subscript m is 0 or 1 and (m+k) is 1 or 2; and 65 to 0 mole percent of at least one silane compound of general formula (II) R′ n SiX 4-n (II) wherein X and R′ are as defined above and the subscript n is 0, 1 or 2; wherein the at least one silane compound of general formula (I) and the at least one silane compound of general formula (II) account for 100 mole percent of silane compounds of the silane composition; and (2) subjecting the resultant product to a hydrosilylation reaction with a hydrosilylation agent having a resin-setting functional group.