Aromatic substituted naphthopyrans
US6478989B1 · kind B1 · utility
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22Claims
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Key dates
| Filing date | Dec 15, 2000 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Dec 15, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D409/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Described are photochromic 2H-naphtho[1,2-b]pyrans characterized by having an aromatic substituent in the 5 position. The aromatic group at 5-position of the naphthopyran is a substituted or unsubstituted aryl group or other substituted or unsubstituted aromatic group. 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.
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