| abstract |
Disclosed is a method of preparing a thiourethane based optical material. In particular, a method of preparing a high-quality optical material, which is colorless and transparent and is not deformed, at a high yield without generation of striae, whitening, and microbubbles is disclosed. The method of preparing the thiourethane based optical material according to present invention is characterized in that, before cast polymerization, a polymerizable composition including a polythiol compound and a polyisocyanate compound is treated at a specific vacuum condition and then injected into a mold. The thiourethane based optical material prepared according to the present invention may be widely used in a variety of fields as a substitute of conventional optical materials. |