Method and photographic material and process comprising a benzotriazole compound
US5352570A · kind A · utility
5Cited by
15References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1991 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Jun 28, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/158
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A new method of preparation of a single isomer of a benzotriazole compound comprises the step of reacting a benzotriazole compound containing symmetrical substituents on the benzo ring with phosgene to produce the corresponding carbamyl chloride. The carbamyl chloride can be reacted with a timeing group of a coupling-off group of a photographic coupler to form a photographic development inhibitor releasing coupler. Such compounds are useful in photographic materials and processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.