Stabilization of precipitated dispersions of hydrophobic couplers
US4957857A · kind A · utility
16Cited by
18References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1988 |
| Grant date | Sep 18, 1990 |
| Priority date | — |
| Expiry date | Dec 23, 2008 |
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.