Composition for optical waveguide cladding, dry film for optical waveguide cladding and optical waveguide

摘要

An aspect of the invention is Epoxy compound containing at least one of bisphenol type epoxy compound (a), the structure shown in formula (1) and the structure shown in the following formula (2) and having molecular weight of 350 or more (b) is a composition for an optical waveguide cladding characterized in that it includes (b).[1]In formula (1), R1 and R2 independently represent hydrogen atoms or alkyl groups, and M represents 2 to 15.[2]In formula (2), R3 and R4 independently represent hydrogen atoms or alkyl groups, and N represents 2-15.