Nonionic oligomeric surfactants and their use as dispersants and stabilizers
US6468727B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2001 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Jan 26, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2001/0854
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A hydrophobically capped oligomeric acrylamide or pyrrolidone is employed as a dispersant for hydrophobic materials in an aqueous medium containing a hydrophilic colloid, e.g. gelatin. The hydrophobic materials include photographic addenda such as color couplers or solid particle dyes. Preferred dispersants have the general formulaR—L—T   (1) or in whichR, R1 and R2 are each independently selected from aliphatic hydrocarbyl, aryl-(aliphatic hydrocarbyl) and (aliphatic hydrocarbyl)-aryl groups,L is a sulphur atom or a linking group that contains a sulphur atom attached to the T group, andT is a hydrophilic oligomeric group obtained by the oligomerisation of one or more vinyl monomers having an amido function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.