| abstract |
(57) [Summary] (Modified) [Constitution] A novel polythiol derivative represented by the general formula (1), and a high refractive index plastic lens obtained by using the same. R— (CH 2 SH) n (1) (R represents a C1-3 lower alkanetriyl or lower alkanetetrayl which may contain a sulfur atom, and n represents an integer of 3 or 4) [Effect] Polythiol The derivative is useful as a raw material for a sulfur-containing urethane resin, and a lens made of this resin is colorless and transparent, has a high refractive index, low dispersion, high heat resistance, low hygroscopicity, and high surface hardness. |