Naphthopyrans annelated in C6-C7, their preparation and compositions and (CO)polymer matrices containing them
US6207084A · kind A · utility
1Cited by
7References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to novel naphthopyrans having a cyclic group annelated in position 6,7. These naphthopyrans have formula (I) given below: ##STR1## These compounds (I) have advantageous photochromic properties. The invention also covers a method of preparing these naphthopyrans, as well as their applications as photochromes and compositions and (co)polymers matrices comprising them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.