Photochromic compound, process for production thereof, use thereof and composition containing said photochromic compound
US5130058A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1989 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Jun 29, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K9/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A photochromic compound represented by the following general formula [I] ##STR1## wherein ##STR2## represents a divalent aromatic hydrocarbon group or a divalent heterocyclic group each of which may have a substituent, PA0 R.sub.1 represents a monovalent hydrocarbon group or a monovalent heterocyclic group each of which may have a substituent, ##STR3## represents a norbornylidene or adamantylidene group which may have a substituent, PA0 X represents an oxygen atom or a group of the formula >N--R.sub.3 in which R.sub.3 represents a hydrogen atom or a hydrocarbon group which may have a substituent, and PA0 R.sub.2 represents a monovalent hydrocarbon group which may have a substituent. Also provided are a process for production of the photochromic compound, a composition containing the photochromic compound, and the use of the photochromic compound. The colored form of this photochromic compound has excellent thermal stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.