| 摘要 |
PROBLEM TO BE SOLVED: To obtain a resin composition small in decrease of light transmittance even under high-temperature and high-humidity conditions and excellent in workability and soldering reflow resistance by mixing an epoxy resin with a polycyclic phenol and an accelerator. SOLUTION: The epoxy resin used is exemplified by a polyfunctional epoxy resin being a glycidyl ether compound of a polyphenol compound. The polycyclic phenol acts as a curing agent for the epoxy resin and is desirably e.g. a compound represented by formula I or II. It is used in an amount of 0.4-1.5 eq per eq epoxy groups of the epoxy resin. The accelerator has a function of accelerating the cure of the epoxy resin and is exemplified by 2-methylimidazole. In preparing the composition, the respective components are mixed with each other, and the mixture is kneaded at a temp. of 80-120 deg.C, cooled, and ground into a powdery composition. When the components are liquid, they are uniformly dispersed with e.g. a planetary mixer to form a composition.
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