Photochromic naphthopyrans
US6353102B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 17, 1999 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Dec 17, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D311/92
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are novel photochromic naphtho[1,2-b]pyran compounds having certain substituents at the 2 position of the pyran ring, certain substituents at the 5 and 6 positions and optionally at the 7, 8, 9 and 10-positions of the naphtho portion of the compound. These compounds may be represented by the following graphic formula: Also described are polymeric organic host materials that contain or that are coated with such compounds. Optically clear articles such as ophthalmic lenses or contact lenses that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., certain other naphthopyrans, benzopyrans, and spiro(indoline)type compounds, are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.