Process for preparing lignosulfonates
US4521336A · kind A · utility
21Cited by
16References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 16, 1984 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Apr 16, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P1/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed herein is a process for preparing sulfonated lignins by selectively isolating lignins having molecular weights greater than 5,000 and subsequently reacting the lignin with sodium sulfite and an aldehyde. The resulting sulfonated lignins are useful as dispersants for disperse dyes and vat dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.