Photochromic spiroxazine compounds
US5446150A · kind A · utility
12Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1993 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Dec 2, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K9/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Photochromic materials which have a structure which includes a spiro-pyrrolidinebenzoxazine structure comprising a pyrrolidine part and a benzoxazine part and the benzoxazine part includes at least one mesomeric electron donating group chosen from amino and alkoxy moieties, the one or more mesomeric electron donating groups being linked to the 6' position via attachment to a conjugated system in which the unsaturated bonds forming the linkage are chosen from --C.dbd.C--, --C.tbd.C--, --C.dbd.N-- and --N.dbd.N--.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.