| abstract |
(C) a polythiol compound, (d) a polyisocyanate compound, and (d) a polyisocyanate compound, wherein the polyisocyanate compound is added to the polyisocyanate compound By mixing, a composition for an optical material capable of obtaining a uniform optical material can be produced. Further, by polymerizing and curing the present composition for an optical material, a high refractive index (ne of 1.73 or more), a high strength (an elongation of 13% or more in a 3-point bending test and a good drill strength) and a high heat resistance 70 deg. C or more) can be provided. |