Patent ID: 8637628

Claim:
A silicone composition for sealing a light emitting element comprising: (A) a vinyl group-containing organopolysiloxane having a three-dimensional network structure represented by an average unit formula: (Sio 4/2 ) a (ViR 2 SiO 1/2 ) b (R 3 SiO 1/2 ) c (where Vi represents a vinyl group, R′s are identical or different substituted or unsubstituted monovalent hydrocarbon groups other than alkenyl groups, and a, b, and c are positive numbers satisfying that a/(a+b+c) is 0.2 to 0.6 and b/(a+b+c) is 0.001 to 0.2); (B) an organohydrogenpolysiloxane which has at least two hydrogen atoms, each hydrogen atom being bonded to a silicon atom per molecule, and has a three-dimensional network structure consisting of a (CH 3 ) 2 HSiO 1/2 unit and a SiO 4/2 unit with a mole ratio of 2:1, the organohydrogenpolysiloxane being contained in such an amount that an amount of a hydrogen atom bonded to a silicon atom is 0.3 to 3.0 mol per 1 mol of a vinyl group bonded to a silicon atom in the component (A); and (C) a hydrosilylation catalyst (catalytic amount), not containing a filler, wherein a coefficient of linear expansion of the composition after curing is 10×10 −6 to 290×10 −6 /° C.