Stable aqueous reactive dye composition and method for stabilizing an aqueous reactive dye composition
US5772699A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1997 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Feb 10, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P1/6533
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An aqueous reactive dye composition is disclosed. The aqueous reactive dye composition has improved storage stability and contains a water-soluble reactive dye and a chelating agent. The chelating agent is present in a sufficient concentration to maintain the pH of the aqueous reactive dye composition in the range of about 3.0 to about 7.0 and, preferably, about 5.0 to about 6.5. Desirable chelating agents are dicarboxylic acids, such as succinic acid, or amino carboxylates, such as nitrilotriacetic acid. A method of stabilizing an aqueous reactive dye composition is disclosed and includes the step of dissolving a polycarboxylic acid or an amino carboxylate in an aqueous solution of a water-soluble reactive dye in a sufficient concentration to stabilize the pH of the composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.