| abstract |
An optical-waveguide-clad composition includes a bisphenol type epoxy compound (A), and an epoxy compound (B) containing, in a molecule, at least one of a structure represented by the following formula (1) and a structure represented by the following formula (2), and having a molecular weight of 350 or higher. n n n n n n n n n n In the formula (1), R 1 and R 2 each independently represent a hydrogen atom or an alkyl group, and m represents 2 to 15. n n n n n n n n n n In the formula (2), R 3 and R 4 each independently represent a hydrogen atom or an alkyl group, and n represents 2 to 15. |