Polyalkoxylated naphthopyrans
US5961892A · kind A · utility
50Cited by
15References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 11, 1998 |
| Grant date | Oct 5, 1999 |
| Priority date | — |
| Expiry date | Sep 11, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are novel photochromic polyalkoxylated naphthopyran compounds, examples of which are certain 2H-naphtho1,2-b!pyrans, 3H-naphtho2,1-b!pyrans and indeno2,1-f!naphtho1,2-b!pyrans, each having at least one polyalkoxylated substituent of from 2 to 50 alkoxy units per substituent. Specific substituents may also be present on the naphtho, indeno and pyrano portions of the compounds. These compounds may be represented by the following graphic formulae: ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.