Chromium complexes of mixed azo compounds
US4311641A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1979 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Sep 10, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B45/26
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to chromium complex dyes which, in the form of the free acid, have the formula ##STR1## wherein X is a direct bond or a bridge member, each of Z and Z' independently is a nitrogen atom or a --CH-group, p is 1 or 2, each of Y and Y' independently is an oxygen atom or a group of the formula --NR--, wherein R is hydrogen or low molecular alkyl, with the proviso that if Z or Z' is a --CH-group, Y or Y' must be an oxygen atom, R.sub.1 is hydrogen or a substituent, B is a benzene or naphthalene radical, A is the radical of an o-hydroxyaldehyde if Z' is the --CH-group or, if Z' is a nitrogen atom, A is the radical of a coupling component which couples in the ortho-position to Y', D is the radical of an o-hydroxyaldehyde if Z is the --CH-group or, if Z is a nitrogen atom, D is the radical of a coupling component which couples in the ortho-position to Y, and n is an integer from 1 to 10. The invention also relates to the manufacture of these dyes by metallization and to their use for dyeing polyamide, in particular leather.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.