Asymmetric 1:2-chrome complexes of benzene-azo-naphthalene/naphthalene-azo-naphthalene acid dyes for leather
US4904767A · kind A · utility
1Cited by
7References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1987 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Jun 29, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B45/16
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Asymmetric 1:2-chrome complex dyes of the formula: ##STR1## wherein A is the radical of 1-hydroxynaphthalene or 2-hydroxynaphthalene, PA0 R.sub.1 is hydrogen, chlorine or methyl, PA0 R.sub.2 is hydrogen, nitro or chlorine, and PA0 Ka.sup.+ is a cation, and of the substituents X.sub.1, X.sub.2 and X.sub.3 one is an SO.sub.3 group, and the other two are hydrogen, X.sub.3 being hydrogen when R.sub.1 is chlorine and R.sub.2 is hydrogen, give blue shades on leather and other polyamides, which shades are lightfast and fast to wet processing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.