PHOTOSENSITIVE EPOXY RESIN COMPOSITION FOR OPTICAL WAVEGUIDE CURABLE FILM FOR FORMATION OF OPTICAL WAVEGUIDE AND OPTICAL WAVEGUIDE AND OPTICAL/ELECTRICAL TRANSMISSION HYBRID FLEXIBLE PRINTED WIRING BOARD PRODUCED BY USING THE PHOTOSENSITIVE EPOXY RESIN COMPOSITION AND OPTICAL WAVEGUIDE PRODUCTION METHOD

摘要

As a photosensitive epoxy resin composition for optical waveguides containing the following (A)-(E) components, the ratio of each component is a specific range with respect to the total amount of the epoxy resin. For this reason, it is excellent in coatability, patterning resolution, roll-to-roll process suitability, and has high transparency and heat resistance. (A) The cresol novolac-type polyfunctional epoxy resin which does not contain the fluorene skeleton-containing epoxy resins of the following (C) and (D) components. (B) Bisphenol A solid epoxy resin. (C) A fluorene skeleton-containing solid epoxy resin. (D) A fluorene skeleton-containing liquid epoxy resin. (E) Cationic curing initiator.