Water-soluble acid azo dye
US4187218A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1978 |
| Grant date | Feb 5, 1980 |
| Priority date | — |
| Expiry date | Mar 15, 1998 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P1/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a class of water-soluble acid azo dyes, containing at least a sulphonic group, having formula (I): ##STR1## wherein the symbols have the following meanings: A is a residue of a diazotizable aromatic or heterocyclic amine, optionally substituted; PA1 R is selected from the group consisting of H, CH.sub.3, OCH.sub.3 and OC.sub.2 H.sub.5 ; PA1 R.sub.1 is selected from the group consisting of CH.sub.3 and C.sub.2 H.sub.5 ; PA1 R.sub.2 is selected from the group consisting of CH.sub.3 and C.sub.2 H.sub.5. The dyes which are the object of the present invention exhibit shades varying from yellow to blue and are useful for dyeing and printing natural polyamide fibres (wool and silk) and synthetic fibres (nylon). They possess an excellent affinity in both an acid bath and a neutral bath and an excellent tinting power. The dyes obtained are characterized by a remarkable purity of shade, by an excellent stability to sunlight, to washing and to sweat, as well as by a good equalizing power on nylon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.