| abstract |
(57) [Summary] [Purpose] The cured product has low specific gravity, high refractive index, surface hardness, Provided is a lens composition having excellent chemical resistance and transparency. [Structure] Specific urethane compound (A), (In the formula, R 1 represents a hydrogen atom, a methyl group or the like, R 2 to R 5 represent a hydrogen atom, a methyl group, a phenyl group, a bromine atom, or the like, a and b are each an integer of 1 to 3, the average value of a + b indicates a number of 2 to 6, Y is a sulfur atom, oxygen atom is X, -CH 2- , -C (CH 3 ) 2 and the like. And a resin composition containing an unsaturated group-containing compound (B) other than the component (A). |