| 摘要 |
PURPOSE:To make the characteristic of photo output excellent by reducing the internal stress by a method wherein terminal dihydroxypolyester whose molecular weight is 3,000-50,000 and 1,8-diaza-bicyclo-undecene-7 are added to epoxy resin. CONSTITUTION:In order to reduce the internal stress and make the characteristic of photo output excellent without decreasing the thermal deformation temperature and the photo transmittance of the sealed resin, a light emitting element is sealed with the epoxy resin composition consisting of the 100 superposition of epoxy resin, 5-30 superposition of terminal dihydroxypolyester which is soluble to said resin and has the molecular weight of 3,000-50,000, 50-150 superposition of anhydride hardener, and 0.1-10 superposition of 1,8-diaza-bicyclo (5, 4, 0) undecene-7 or at least one kind of compound selected out of its salts as a hardening promotor. Thereby, the workability based on the compatibility with said resin, dispersion property, and viscosity characteristic and the thermal deformation temperature for the hardened substance is optimized. |
