Formulations of fluorescent whitening agents
US6620294B1 · kind B1 · utility
4Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 2002 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Feb 8, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2211/1007
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Stable formulations of fluorescent whitening agents are described. These contain a) 2 to 20% by weight of a fluorescent whitening agent of formula (1) in which R1 is hydrogen, C1-C5-alkyl, C1-C5-alkoxy or halogen and M is hydrogen, an alkali metal, ammonium or magnesium, b) 4 to 30% by weight of an unmodified or modified polyvinyl alcohol, c) 55 to 94% by weight of water and d) 0 to 20% weight of further additives, polyethylene glycol being excluded. A process for the preparation of the formulations and their use for whitening paper materials is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.