Photographic material containing sulphonic acid group containing disazo dyestuffs
US4118232A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1977 |
| Grant date | Oct 3, 1978 |
| Priority date | — |
| Expiry date | Mar 15, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G17/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention is directed essentially to photographic material containing, on a carrier, a layer with azo dyestuffs of the formula ##STR1## wherein A, B, X and Y are certain substituents, in a second main aspect azo dyestuffs of the formula ##STR2## wherein B' represents certain substituents and in a third main aspect azo deystuffs of the formula EQU A.sub.1 --N.dbd.N--B.sub.1 --NH--CO--X.sub.1 --Y--Z.sub.1 --OC--HN--B.sub.1 --N.dbd.N--A.sub.1 wherein A.sub.1, B.sub.1, X.sub.1, Z.sub.1 and Y are certain substituents. The photographic materials provide advantages stemming from the use of the dyestuffs of the invention which are distinguished by particularly high fastness to light coupled with excellent bleachability, good resistance to diffusion and advantageous color strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.