| abstract |
(57) [Summary] [Structure] An isocyanate compound containing at least one alicyclic isocyanate compound represented by the formula (1), A composition for a plastic lens containing a polythiol compound represented by the formula (2), a plastic lens made of a urethane resin obtained by polymerizing the same, and a method for producing them. [Effect] The lens made of the urethane resin of the present invention has excellent optical properties, has a small specific gravity, and is extremely excellent in impact resistance. |