Azo dyes prepared using 2-alkylamino-3-cyano-4,6-diaminopyridines as coupling components
US5196521A · kind A · utility
2Cited by
4References
5Claims
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Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B29/0003
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The dyes of the formula ##STR1## in which R.sub.1 is hydrogen, halogen or CF.sub.3 and R.sub.2 is substituted or unsubstituted alkyl, where R.sub.2 must not be ethoxycarbonylethyl if R.sub.1 is hydrogen are suitable for the dyeing of polyester material in red hues having very good lightfastness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.