Heterocyclic containing disazo compounds
US3931142A · kind A · utility
2Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1973 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Oct 23, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B43/136
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Polyazo dyestuffs of the formula EQU A--N=N--M--D--M'--N=N--A' wherein A and A' each represents a 2(8)-amino-8(2)-hydroxynaphthalene radical further substituted with a sulphonic acid group, M and M' each represents a substituted 1,4- or 1,3-phenylene radical and D represents an organic radical bonded in the manner of an amide to M and M', said dyestuffs containing at least two sulphonic acid groups in the molecule, as well as photographic material containing in at least one layer a polyazo dyestuff of the above formula are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.