| abstract |
A photosensitive resin composition, a photosensitive resin cured product, a photosensitive resin film, and a light obtained by using a photosensitive resin film cured product that is soluble in an alkaline aqueous solution and has good propagation loss in the visible light region. Providing a waveguide. A photosensitive film comprising a base film, (A) a vinyl polymer having at least one functional group capable of chain polymerization in one molecule, (B) a polymerizable compound and (C) a polymerization initiator. In the resin composition, the component (C) comprises oxyphenylacetic acid 2- [2-oxo-2-phenylacetoxyethoxy] ethyl ester, oxyphenylacetic acid 2- (2-hydroxyethoxy) ethyl ester, and oligo {2 Using a photosensitive resin film that is at least one selected from the group consisting of -hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl]} propanone, the lower cladding layer 4, the core portion 2, An optical waveguide 1 in which at least one of the upper cladding layers 3 is formed. [Selection] Figure 1 |