Trisazo black dyes from 2-(4'-aminophenylazo)-7-amino-1-naphthol-3-sulfonic acid
US4737240A · kind A · utility
14Cited by
12References
15Claims
0Family size
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Key dates
| Filing date | Jun 27, 1986 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Jun 27, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S534/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Black trisazo dyes for cellulosic textiles, leather and especially paper having the structure ##STR1## where A is ##STR2## one of B.sub.1 and B.sub.2 is hydrogen and the other is --SO.sub.3 M or a mixture thereof, and M is hydrogen, sodium, potassium, lithium or --HNR.sub.1 R.sub.2 R.sub.3 wherein R.sub.1, R.sub.2 and R.sub.3 represent the same or different substituents selected from hydrogen, lower alkyl and lower hydroxyalkyl, and stable liquid concentrates of these dyes are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.