Patent ID: 7838117

Claim:
A process for producing a silicone-sealed LED, comprising: (1) applying a liquid curable silicone rubber composition to a LED chip and curing said liquid curable silicone rubber composition to form a cured silicone rubber layer with a hardness, as measured by a JIS Type A hardness meter, within a range of 0 to 50 on and in contact with said LED chip, and thereafter (2) applying a liquid curable silicone resin composition to a periphery of said cured silicone rubber layer and curing said liquid curable silicone resin composition to form a cured silicone resin layer with a hardness, as measured by a Shore D hardness meter, of at least 40 on the periphery of said cured silicone rubber layer, wherein the difference between the refractive index of said liquid curable silicone rubber composition and the refractive index of said liquid curable silicone resin composition is no greater than 0.05, and said liquid curable silicone resin composition comprises: (A3) a siloxane-based compound that comprises at least two silicon atom-bonded alkenyl groups within each molecule; (B3) a siloxane-polycyclic hydrocarbon-based compound, which is an addition reaction product of (a) a siloxane-based compound comprising at least three silicon atom-bonded hydrogen atoms within each molecule, and (b) a polycyclic hydrocarbon comprising two addition reactive carbon-carbon double bonds within each molecule, and comprises at least two silicon atom-bonded hydrogen atoms within each molecule; and (C) a hydrosilylation reaction catalyst.