Claims
- 1. In a process for the preparation of dyeings by producing metal-free water-insoluble azo dyestuffs on the water according to the methods of the ice color dyeing, in which the fiber material is at first impregnated with a coupling component in an alkaline medium and the thus impregnated material is subsequently developed by treating it, with a developing bath which contains the diazonium compound, the improvement consisting in using a developing bath which contains an alkali metal-tri- or -tetrapolyphosphate, the pH value of the developing bath being greater than 4.5 prior to the coupling and smaller than 9 after the coupling process.
- 2. A process as claimed in claim 1, wherein the alkali metaltripolyphosphate is sodium-tripolyphosphate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2709623 |
Mar 1977 |
DEX |
|
Parent Case Info
This application is a continuation of application Ser. No. 882,222 filed Feb. 28, 1978 now abandoned.
US Referenced Citations (3)
Continuations (1)
|
Number |
Date |
Country |
Parent |
882222 |
Feb 1978 |
|