Indolino-spiro-oxazine photochromic compounds with five-membered rings, method for their preparation, photochromic compositions and articles containing such compounds
US5114621A · kind A · utility
23Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1990 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Jun 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/685
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The new photochromic compounds of the invention have the formula of an indolino-spiro-oxazine comprising an indolinic part and an oxazine part, wherein said oxazine part comprises an unsaturated heterocycle with 5 links which comprises one or several atoms selected from nitrogen and sulphur. Preferably the heterocycle is orthocondensed with a benzenic ring of the oxazine part of the compound, and said heterocycle comprises an imine C.dbd.N-bond. The ozazine part may typically be comprised of a benzothiazol-oxazine group of of an indolino-oxazine group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.