| 摘要 |
<p>In order to impart high heat resistance and dyeability to a high-refractive-index plastic lens obtained by curing a compound having an episulfide group, a lens is obtained by polymerizing and curing a composition which consists mainly of a compound having an episulfide group, a polythiol compound having a functionality of 3 or higher, and a dithiol compound, the amount of the dithiol compound being 5 to 40 wt.% based on the sum of the polythiol compound and the dithiol compound. This lens has a high refractive index, high heat resistance, and dyeability.</p> |
