Photochromic spiro(indoline)naphthoxazine compounds
US5405958A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1992 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Dec 21, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are novel reversible photochromic spiro(indoline) naphthoxazine compounds of improved photocolorability that may be graphically represented by the formula, ##STR1## In preferred embodiments, R.sub.1 is allyl, alkoxyalkyl, and alkyl; each R.sub.2 is alkyl or alkoxy; R.sub.3 and R.sub.4 are alkyl; R.sub.5 is alkoxycarbonyl; and R.sub.6 is hydroxy, alkoxy, or carboxy, e.g., acetoxy. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the naphthoxazine compounds or combination thereof with complementary photochromic compounds, e.g., naphthopyran or benzopyran compounds, are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.