Fluorescent whitening agent, its preparation and use
US6165973A · kind A · utility
6Cited by
8References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Jan 28, 2020 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06M2101/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A fluorescent whitening agent comprising a mixture of compounds of the formulae Ia, Ib and Ic: ##STR1## in which the --SO.sub.3 R groups are in the meta and/or para position, and wherein R and M, independently of each other are H, Na, Li, K, Ca, Mg, ammonium, or ammonium that is mono-, di-, tri- or tetra-substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 -hydroxyalkyl or a mixture thereof, a process for its preparation and its use to brighten paper and especially textile materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.