abstract |
The present invention describes compounds that generally include an indeno[2',3':3,4]naphtho[1,2-b]pyran structure. Such compounds can be useful due to their photochromic properties and can be used in certain photochromic compositions. The composition may further comprise other photochromic compositions and/or materials. Additionally, the compounds and/or compositions may be suitable for the preparation of certain photochromic articles. |