| 摘要 |
PROBLEM TO BE SOLVED: To provide a new photochromic naphthopyran compound. SOLUTION: The present invention relates to a naphthopyran compound represented by formula. The naphthopyran compound does not change color tone and faded color tone, even when the compound is mixed with a compound having at least one epoxy group in the molecule and then polymerized to obtain a cured product. Thereby, when the compound is processed into a photochromic spectacle lens, the lens does not change the color tone, when used, and can be used over a long period. COPYRIGHT: (C)2009,JPO&INPIT
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