Resin for optical material

摘要

A resinous composition which comprises a compound having, in one molecule, one or more structures of the formula (1) wherein R1 is a hydrocarbon having 1 to 10 carbon atoms; R2, R3 and R4 are each hydrogen or a hydrocarbon group having 1 to 10 carbon atoms; and X is S or O, and a ratio of S to the total of S and O constituting the three-membered ring is 50% or more on the average; and another compound having one or more SH groups in one molecule. The resinous composition can be used for an optical material having improved oxidation resistance.