Patent ID: 7879405

Claim:
A process for producing a light emitting device comprising the steps of: (i) sealing a light emitting device with a heat-curable composition comprising a modified polysiloxame containing, in a molecule, not less than one alicyclic hydrocarbon group and not less than two epoxy groups wherein the alicyclic hydrocarbon group is a nobornyl group and/or a cyclohexyl group that is not substituted by an epoxy group, the epoxy group is an ethynylcyclohexene oxide group, and the substituent having the epoxy group and the polysiloxane are bonded through a Si—C bond, and a curing agent for an epoxy resin, and (ii) heat-curing said heat-curable composition of the light emitting device, wherein the modified polysiloxane is represented by the formula (1) or the formula (2) where R 1 is hydrogen, a hydroxyl group, an aliphatic hydrocarbon group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, R 2 is an ethynylcyclohexane oxide group, R 3 is a norbornyl group and/or a cyclohexyl group that is not substituted by an epoxy group, R 4 is any group of R 1 to R 3 , p and r are each an integer of 0≦p≦50 and 1≦r≦50, and q is an integer of 0≦q≦50 when two R 4 s are both R 2 , 1≦q≦50 when one of the R 4 s is R 2 , and 2≦q≦50 when neither of the two R 4 s is R 2 or no R 4 is present.