Benzopyrans annelated in C7-C8 with an aromatic heterocycle and compositions and (CO)polymer matrices containing them
US6426023B1 · kind B1 · utility
4Cited by
9References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2000 |
| Grant date | Jul 30, 2002 |
| Priority date | — |
| Expiry date | Jun 8, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/23
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to novel benzopyran-type compounds having an aromatic heterocycle annelated in position 7,8 and a carbocycle annelated in position 5,6. These compounds have the formula (I) given below: These compounds (I) have interesting photochromic properties. The invention also relates to their preparation, to their applications as photochromes, as well as to the compositions and (co)polymer matrices containing them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.