发明授权
- 专利标题: Chromene compound
- 专利标题(中): 色烯化合物
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申请号: US09242598申请日: 1999-02-19
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公开(公告)号: US06197225B1公开(公告)日: 2001-03-06
- 发明人: Tsuneyoshi Tanizawa , Tadashi Hara , Yuichiro Kawabata , Junji Momoda , Hironobu Nagoh
- 申请人: Tsuneyoshi Tanizawa , Tadashi Hara , Yuichiro Kawabata , Junji Momoda , Hironobu Nagoh
- 优先权: JP9-162541 19970619; JP9-207871 19970801; JP10-84678 19980330
- 主分类号: G02B523
- IPC分类号: G02B523
摘要:
A photochromic compound featuring a large fading rate to prevent a change in the color tone at the time of fading, exhibiting little color after aged, and exhibiting good durability in the photochromic property. The photochromic compound is a novel chromene compound having a substituted phenyl group at the second position of the naphthopyrane ring and an alkyl group at the fifth position thereof, and is represented by, for example, the following formula, wherein R1 is an alkyl group, R2 and R3 are substituted phenyl groups, and R4 and R5 are substituents.