PHOTOSENSITIVE EPOXY RESIN COMPOSITION FOR FORMING OPTICAL WAVEGUIDE, PHOTOSENSITIVE FILM FOR FORMING OPTICAL WAVEGUIDE, OPTICAL WAVEGUIDE USING SAME, AND MIXED FLEXIBLE PRINTED CIRCUIT BOARD FOR OPTICAL AND ELECTRIC TRANSMISSION

摘要

Provided is a photosensitive epoxy resin composition for forming an optical waveguide that can be used for an optical waveguide forming material which has excellent heat coloring resistance and patterning property and further has excellent R-to-R compatibility (excellent flexibility of uncured resin). The photosensitive epoxy resin composition for forming an optical waveguide comprises an epoxy resin component and a photocationic polymerization initiator, said epoxy resin component including an epoxy resin having a tri- or higher functional bisphenol A type skeleton.