Photochromic 6-aryl substituted 3H-naphtho(2,1-b)pyrans
US6630597B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1997 |
| Grant date | Oct 7, 2003 |
| Priority date | — |
| Expiry date | Dec 15, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/92
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are novel photochromic 6-aryl substituted 3H-naphtho[2,1-b]pyran compounds, examples of which are naphthopyran compounds having a substituted aryl group at the number 6 carbon atom and certain substituents at the 3-position of the pyran ring. Certain substituents may also be present at the number 7, 8, 9 or 10 carbon atoms of the compounds. These compounds may be represented by the following graphic formula: Also described are polymeric organic host materials that contain one or more of such compounds or combinations of such compounds) with complementary photochromic compounds, e.g., other naphthopyrans, benzopyrans and spiro(oxazine)type compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.