Process for preparing stable emulsions of polyelectrolytes of high molecular weight as reverse emulsion
US5750614A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1995 |
| Grant date | May 12, 1998 |
| Priority date | — |
| Expiry date | Dec 1, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/32
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing stable emulsions of polyelectrolytes of high molecular weight as reverse emulsion, in which: PA1 the monomers are dissolved in an aqueous phase, PA1 an organic phase containing a surface-active agent is prepared, PA1 these two phases are mixed to obtain an emulsion of the water-in-oil (W/O) type, PA1 the monomers are polymerized, PA1 the emulsion is incorporated to obtain a water-in-oil (W/O) emulsion, so as to make the polyacrylamide obtained water-soluble, which consists in adding to the aqueous phase a soluble polymer of low molecular weight, of the same general chemical nature and of the same ionic nature as the polyelectrolyte of high molecular weight which is envisaged. Envisaged application: preparation of polyacrylamide for flocculation and/or thickening applications (urban and industrial water treatments, papermaking).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.