Stabilization of precipitated dispersions of hydrophobic couplers
US5087554A · kind A · utility
6Cited by
21References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1990 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Jun 27, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3882
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides stable dispersions of couplers and methods of their formation. The stable dispersions are formed by the use of a nonionic water soluble polymer in combination with an anionic surfactant having a sulfate or sulfonate head group and a hydrophobic group of 8 to 20 carbons. The preferred nonionic water soluble polymers are polyethyleneoxide and polyvinylpyrrolidene. It is preferred that the dispersions have a pH of between about 5 and 5.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.