Photochromic compounds
US4960678A · kind A · utility
20Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1989 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Sep 6, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/163
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A compound represented by the following general formula [I] ##STR1## wherein ##STR2## represents a norbornylidene group or an adamantylidene group each of which may have a substituent, and PA0 X represents an oxygen atom, the group >N--R.sub.2, the group >N--A.sub.1 --B.sub.1 --A.sub.2).sub.m (B.sub.2).sub.n R.sub.3, the group >N--A.sub.3 --A.sub.4, or the group >N--A.sub.3 --A.sub.4, provided that when ##STR3## is an adamantylidene group, X is selected from the above groups excepting the oxygen atom and the group >N--R.sub.2 ; and plastic lens containing the compound of the above formula [I].
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.