| 摘要 |
The present invention relates to a thioepoxy compound from which a high-quality optical material having a good and clear color and causing no whitening can be obtained, and a polymerizable composition for a thioepoxy-based optical material comprising the same. The present invention provides a method for preparing a thioepoxy compound for an optical material, which uses an epichlorohydrin compound as a starting material, wherein the epichlorohydrin compound has a total content of specific impurities, including acrolein, allyl chloride, 1,2-dichloropropane and 2,3-dichloropropene, of 1 wt% or less. According to the present invention, it is possible to obtain a thioepoxy compound causing less coloration by adjusting the content of specific impurities in the epichlorohydrin compound. In addition, the resultant thioepoxy compound can be used to obtain a high-quality transparent thioepoxy-based optical material having a good color and causing no whitening. The thioepoxy-based optical material according to the present invention is useful for corrective lenses, sunglass lenses, fashion lenses, metachrosis lenses, camera lenses, and lenses for optical devices. |
