9, 9-bis (condensed polycyclic aryl) having glucoskeleton episulfied compd. dialkylfluorene and cure

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PROBLEM TO BE SOLVED : To provide a cured product having superior characteristics such as high heat resistance and a high refractive index.SOLUTION : An episulfide compound represented by formula (1) is heated to be cured. In the formula, Z is a condensed polycyclic aromatic hydrocarbon ring; Rand Rare substituents; k is an integer of 0-4; and m is an integer of ≥0.