Aminosulfonylphenyl-azo-indolyl dyestuffs
US4000123A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1975 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Feb 3, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B29/3613
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Monoazo dyestuffs which in the form of the free acid correspond to the general formula ##STR1## wherein R.sub.0, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 have the meaning given in the description and their use for the dyeing of natural and synthetic fibre materials, especially for dyeing polyamide fibres. Dyeings obtained distinguish themselves by very good fastness to light. Dyestuffs are absorbed well on polyamide fibres already in a neutral to weakly acid dye bath. By polyamide fibres there are here especially understood those from synthetic polyamides such as .EPSILON.-polycaprolactam, or condensation products of adipic acid and hexamethylenediamine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.