| 摘要 |
PROBLEM TO BE SOLVED: To provide a resin composition for an optical material, from which a resin layer having properties of high transparency, a low refractive index and low thermal expansion can be formed.SOLUTION: The resin composition comprises (A) an epoxy compound having two or more epoxy groups, (B) a compound having a phenolic hydroxyl group, and (C) silica particles having an average particle diameter of 1 nm or more and 70 nm or less. For example, in all atoms of carbon, nitrogen and oxygen constituting the (A) component, when the total number of these atoms and a number n of atoms in which all chemical bonds with other atoms consist of single bonds are denoted by N and n, respectively, n/N is 0.6 or more and 1 or less. |
