Photochromic bis-naphthopyran compounds and methods for their manufacture
申请人:——
公开号:US20030078441A1
公开(公告)日:2003-04-24
The invention provides photochromic bis-naphthopyran compounds as well as methods for their manufacture and their use. The bis-naphthopyran compounds of the invention exhibit a wide range of color, i.e., from pink to purple to blue gray, upon activation by a source of UV light. Additionally, the bis-naphthopyran compounds of the present invention exhibit broad coloration ability, fast response as to both color change on activation and return to original color, and good fatigue-resistance.