Episulfide composition, polymerizable composition, cured product, optical material, and lens

Abstract

This episulfide composition contains an optically-active compound A that includes one sulfide bond and two episulfide rings, and one of the two episulfide rings is an episulfide ring 1 that includes an asymmetric carbon atom C*1, and the other of the two episulfide rings is an episulfide ring 2 that includes an asymmetric carbon atom C*2. The optically-active compound A includes: at least one of a compound A-SS in which both C*1 and C*2 are S configurations and a compound A-RR in which both C*1 and C*2 are R configurations; and a compound A-RS in which one of C*1 and C*2 is an R configuration and the other is an S configuration. The ratio of the peak area RS of the compound A-RS to the total peak area T of the compound A-SS, the compound A-RR and the compound A-RS, as measured by HPLC, is 10-80% by area.