Process for the production of water-insoluble azo dyestuffs on the fiber
US4183727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1978 |
| Grant date | Jan 15, 1980 |
| Priority date | — |
| Expiry date | Jun 12, 1998 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P3/68
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved process for the preparation of water-insoluble azo dyestuffs on vegetable fibers according to the method of the ice-color technique had been found, impregnating first the fibrous material with an azo component and then developing it with a diazo solution of an aromatic amino compound in the neutral or slightly alkaline range, wherein an alkali metal borate is used to neutralize the diazo solution. The dyeings prepared in this improved dyeing process for ice color dyeing have very good fastness properties and are obtained with high color yields. The improvement of the dyeing process is seen in the use of alkali metal borate as a neutralizing agent, which avoids the creation of foam in the surfactant-containing diazo solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.