| abstract |
[PROBLEMS] An LED seal that is easy to handle at room temperature, has good pot life and storage stability, has little cure shrinkage, has high cured product hardness, has no stickiness on the surface, and has excellent heat resistance and UV resistance. A multifunctional epoxy silicone resin suitable as a resin for a stopper is provided. 10 to 70% by weight of a silane monomer having three OR groups and 30 to 90% by weight of a silane monomer having one epoxy group and two OR groups are mixed with water and an alkali metal carbonate or alkaline earth metal carbonate. Condensation in the presence of a basic catalyst comprising a salt, and then using 10 to 90% by weight of a silane compound having one OR group as a terminal terminator, the terminal alkoxy group and the terminal silanol group are blocked under acidic conditions. A polyfunctional epoxy silicone resin is obtained by carrying out. [Selection figure] None |