| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a material having high refractive index and exhibiting heat resistance and impact resistance at the same time. <P>SOLUTION: There are provided a tetrathiaspiro compound expressed by formula (1), formula (2), etc., a composition containing the compound of formula (1), formula (2), etc., an optical material obtained by curing the composition, and a method for producing the optical material. <P>COPYRIGHT: (C)2010,JPO&INPIT |
