| abstract |
In the present invention, the following formula (2):n n n n n n n n An episulfide compound having at least one epithio structure in one molecule represented by formula (wherein R 5 to R 8 , Y, p and q are as defined in the specification) is an element of Groups 13 to 16 of the long form periodic table. Halide of and / or the following formula (1):n n n n n n n n (Wherein R 1 to R 4 , X and m are as defined in the specification) to polymerize in the presence of a polymerization regulator to obtain a curable resin useful as an optical material. Polymerization of episulfide compounds by using the polymerization regulator It is possible to control the speed appropriately, and to obtain a cured resin with less optical distortion, scratches, coloring, and peeling from the polymerization frame. In addition, the use of the halide increases viscosity during preservation of the raw material composition and during casting. In particular, it is possible to suppress the increase in viscosity due to natural polymerization after addition of the polymerization catalyst. |