Photochromic dinitrated spiropyrans
US5155230A · kind A · utility
8Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1990 |
| Grant date | Oct 13, 1992 |
| Priority date | — |
| Expiry date | Feb 20, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/685
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a photochromic material possessing absorption sensitivity in a longer wavelength region when compared with conventional photochromic materials. The photochromic material is a spiropyran compound having a methoxy group at the 6 position, nitro groups at the 8 and 5' positions, and an alkyl group at the 1' position of the spiropyran skeleton as shown below: ##STR1##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.