A process for producing a polythiourethane resin which comprises (A) a step of synthesizing a polythiol oligomer having disulfide bond by reaction of a polythiol compound having a functionality of two or greater and sulfur and (B) a step of bringing the polythiol oligomer obtained in step (A) and a compound having poly(thio)isocyanate groups into reaction with each other, wherein step (A) is conducted in the absence of solvents using no catalysts or a catalyst substantially inert to the compound having poly(thio)isocyanate groups. A polythiol oligomer exhibiting a greater refractive index than that of the polythiol compound having a functionality of two or greater used as the starting material is produced at a low cost, and a process for producing a practically useful polythiourethane resin exhibiting a stable great refractive index and a great Abbe number is provided.
一种生产聚
硫醚
树脂的工艺,包括(A)通过官能度大于或等于 2 的聚
硫醇化合物与
硫反应合成具有二
硫键的聚
硫醇低聚物的步骤,以及(B)使步骤(A)中获得的聚
硫醇低聚物与具有聚(
硫)
异氰酸酯基团的化合物相互反应的步骤、其中,步骤(A)在无溶剂的条件下进行,不使用催化剂或使用对具有聚(
硫)
异氰酸酯基团的化合物基本惰性的催化剂。以低成本生产出的聚
硫醇低聚物的折射率大于作为起始原料的官能度为 2 或更高的聚
硫醇化合物的折射率,并提供了一种生产具有稳定的高折射率和高阿贝数的实用聚
硫乙烷树脂的工艺。