Dyeing process using a sequestrating agent
US4231749A · kind A · utility
5Cited by
8References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1979 |
| Grant date | Nov 4, 1980 |
| Priority date | — |
| Expiry date | Apr 24, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P1/667
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Dyeing with a dyestuff containing a metal or from a bath in the presence of one or more metallic elements, especially alkaline-earth or heavy metals, is carried out in the presence of a sequestrating agent or sequestrant. According to the invention the sequestrant is a derivative of a phosphonic acid having no effect on the physical-chemical characteristics of the dyestuff which is used and is preferably a salt of a hydroxy-lower-alkane-phosphonic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.