Patent ID: 7772594

Claim:
A semiconductor device characterized in that at least one semiconductor element is provided, the semiconductor elements and at least a part of electrical connecting portions for use in electrically connecting the semiconductor elements to external devices are covered with a synthetic high molecular weight compound, the synthetic high molecular weight compound is a cured product obtained by heat-curing a silicon-containing curable composition which contains silicon-containing polymers as components (A), (B), and (C) described below and a catalyst as component (D) described below, component (A) is a silicon-containing polymer which has one or more reactive groups (A′) selected from the group consisting of the formulas Si—R 1 , Si—O—R 2 , and Si—R 3 —OCOC(R 4 )═CH 2 and has bridged structures formed by Si—O—Si bonds at one location or more, wherein greater than 80 wt % of the molecules of component (A) have a molecular weight of greater than 1,000 [R 1 and R 2 are each a C 2 to C 20 alkenyl group which may contain an alkylene group and/or an arylene group, R 3 is a C 1 to C 9 alkylene group and/or a C 1 to C 9 arylene group, and R 4 is a hydrogen atom or a methyl group], component (B) is a silicon-containing polymer which has Si—H groups and has bridged structures formed by Si—O—Si bonds at one location or more, wherein greater than 80 wt % of the molecules of component (B) have a molecular weight of greater than 1,000, component (C) is a silicon-containing polymer which has one or more reactive groups (A′) selected from the group consisting of the formulas Si—R 1 , Si—O—R 2 , and S 1 —R 3 —OCOC(R 4 )═CH 2 , has Si—H groups, and has bridged structures formed by Si—O—Si bonds at one location or more, and wherein greater than 80 wt % of the molecules of component (C) have a molecular weight of greater than 1,000, and component (D) is a curing catalyst which is a platinum catalyst.