Amine modified sulfonated lignin for disperse dye
US5972047A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1998 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Mar 10, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/915
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Dyestuff compositions are provided which incorporate amine modified sulfonated lignins. The disclosed dyestuff compositions exhibit improved heat stability and, as a result of the higher activity of the amine modified sulfonated lignin, less dispersant is present in the exhaust liquor and waste treatment demands are thereby reduced. The presence of tertiary amine groups in sulfonated kraft, sulfomethylated kraft, and sulfite lignins provide dispersants with package dyeing heat stabilities significantly better than those of the unmodified lignins. The improved package dyeing grinding aid/dispersant of the invention is prepared by reacting sulfonate lignin with a secondary amine using formaldehyde and alkaline conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.