| abstract |
An epoxy resin having a fluorene skeleton having a high refractive index, excellent heat resistance, flame retardancy, and moisture resistance is provided. A fluorene-based epoxy resin having an ether bond in a molecule for reacting a fluorene-based diol compound represented by the formula (1) with an epihalohydrin. (R1 and R2 are each independently a halogen atom or a branched / straight chain C1-6 alkyl group, and when there are a plurality of R1 and / or R2, each is independently; R3 and R4 are each independently a branched / straight chain C2- When there are a plurality of 6 alkylene groups, R3 and / or R4, each independently; m and n are each independently an integer of 1 or more; p and q are each independently 0 or an integer of 1 to 4) None |