Hydrates of the disodium salt or dipotassium salt of 4,4'-bis(2-sulfostyryl)biphenyl
US5437818A · kind A · utility
5Cited by
2References
38Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1993 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Jun 23, 2013 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06L4/621
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to novel hydrates of the disodium salt or dipotassium salt of 4,4'-bis(2-sulfostyryl)biphenyl characterized by their water of hydration content, to the crystal forms associated therewith, characterized by their X-ray diffraction pattern, to processes for the preparation, and to their use for the preparation of concentrated formulations of fluorescent whitening agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.