Naphthopyrans annelated in C5-C6, their preparation and compositions and (co)polymer matrices containing them
US6506538B1 · kind B1 · utility
17Cited by
13References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to novel compounds of the naphthopyran type which have an annelated carbocycle in position 5,6. These compounds are of formula (I) given below: in which A is an alicyclic ring which is optionally annelated with an aromatic ring and in which two adjacent R3 can together form at least one ring, for example a benzo group. These compounds (I) possess interesting photochromic properties. The invention also relates to the method of preparing these compounds (I), as well as their applications as photochromes and compositions and (co)polymer matrices comprising them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.