Photochromic compounds
US7342112B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2004 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Nov 11, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/73
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Various non-limiting embodiments disclosed herein relate generally to photochromic compounds, which may be thermally reversible or non-thermally reversible, and articles made therefrom. Other non-limiting embodiments relate to photochromic-dichroic compounds, which may be thermally reversible or non-thermally reversible, and articles made therefrom. For example, one non-limiting embodiment provides a thermally reversible, photochromic compound adapted to have at least a first state and a second state, wherein the thermally reversible, photochromic compound has an average absorption ratio greater than 2.3 in at least one state as determined according to CELL METHOD. Another non-limiting embodiment provides a photochromic compound comprising: (a) at least one photochromic group chosen from a pyran, an oxazine, and a fulgide; and (b) at least one lengthening agent L attached to the at least one photochromic group and represented by the formula —[S1]c-[Q1-[S2]d]d′-[Q2-[S3]e]e′-[Q3-[S4]f]f′—S5—P, which is described herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.