| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing material of an optical semiconductor device having a long life and excellent mass productivity, and a composition having a moderate viscosity capable of providing such a sealing material.SOLUTION: A resin composition comprises 5-40 mass% of a copolymer comprising a repeating unit represented by the formula (I) and a repeating unit represented by the formula (II), 5-20 mass% of triglycidyl isocyanurate and 40-60 mass% of acid anhydride. |
