| 摘要 |
PROBLEM TO BE SOLVED: To prevent void in a package, by pouring a liquid epoxy resin composition containing epoxy resin, acid anhydride, and hardening accelerator into a tablet-forming die. SOLUTION: Any epoxy-resin-composing material having two or more epoxy groups in one molecule may be used as an epoxy resin, and one or, if necessary, several kinds of phenol novolac type epoxy resins, which are typical of ortho- crezol novolac type epoxy resin and are made by epoxidizing the novolac resins of phenol group and aldehyde group, can be used in combination. Acid anhydride acts as a hardener for the epoxy resin and preferably has alicyclic acid anhydride as a main constituent so as to ensure optical characteristics. Tetraphenylboron sodium such as 8-diazabicyclo(5,4,0)undecen-7, for example, is used as a hardening accelerator. |
