Dyestuff filler derived from kraft black liquor
US4007004A · kind A · utility
11Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1974 |
| Grant date | Feb 8, 1977 |
| Priority date | — |
| Expiry date | Jul 5, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/03
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A dyestuff filler material with humectant properties derived from kraft black liquor is disclosed. The process for obtaining the dyestuff filler material involves the acidification of kraft black liquor followed by separation of the precipitated portion, such as by filtration. The filtrate from this separation is then treated to solubilize the remaining portion of lignin, which primarily is low molecular weight lignin. This step is followed by a stabilization step, for example, with air to oxidize the filler material to minimize azo dye reduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.