Stabilizatin of precipitated dispersions of hydrophobic couplers, surfactants and polymers
US5015564A · kind A · utility
12Cited by
21References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1990 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Jun 1, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/01
- 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.