Photochromic materials demonstrating improved fade rates
US8748634B2 · kind B2 · utility
3Cited by
22References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2007 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | Dec 22, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2211/145
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Various photochromic materials are provided that are essentially free of polymerizable unsaturated groups, and comprise: Alternative embodiments include various substituents at other positions of the indeno[2′,3′:3,4]naphtho[1,2-b]pyran.Also provided are photochromic articles including a substrate and one of the above photochromic materials, in contact with at least a portion of the substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.