Bis-stilbene compounds
US3984399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1974 |
| Grant date | Oct 5, 1976 |
| Priority date | — |
| Expiry date | Sep 27, 1994 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06L4/60
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides the new bis-stilbene compounds, which are useful as optical brighteners and correspond to the formula EQU R.sub.1 -- CH = CH -- X -- CH = CH -- R.sub.2 in which X represents a diphenyl residue bound in positions 4 and 4' to the =CH-- groups; R.sub.1 and R.sub.2 independently of each other, each represents a monocyclic benzene residue, a diphenyl, naphthyl or pyridyl residue, and in which at least one of the cyclic systems R.sub.1, R.sub.2, X contains a possibly functionally modified sulphonic acid group, a sulphone group, a possibly functionally modified carboxylic acid group, a nitrile, hydroxyl, mercapto or methyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.