Concentrated solutions of water-insoluble coupling components
US4331443A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1980 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | Feb 19, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B67/0079
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Concentrated solutions of water-insoluble bis-acetoacetic acid-diphenylamides as coupling components; these solutions contain in addition to one or more of these coupling components water and sodium and/or potassium hydroxide and as aliphatic solvent one or more mono- or di- to hexa-ethyleneglycol monoalkyl ethers having lower alkyl radicals, and optionally ethyleneglycol, diethyleneglycol and/or propyleneglycol. The coupling components are contained in the solutions in a concentration of up to about 50% by weight without deteriorating the storage stability of the solutions. The solutions may be used for preparing water-insoluble azo dyestuffs on the fiber according to "ice-color" dyeing. On pouring into water containing a small amount of sodium hydroxide they give immediately ready-to-use impregnation baths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.