Flocculating or viscosifying compositions and their production and use
US6060164A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1997 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | May 29, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Primary polymer particles having a size at least 90% below 10 .mu.m and which contain water soluble and water insoluble polymer are made by reverse phase polymerisation of a water soluble ethylenically unsaturated monomer or monomer blend with cross linking agent, and the emulsion is then spray dried to form spray dried granules which disintegrate upon addition to water, thereby forming an aqueous composition of the insoluble particles having activity similar to the starting emulsion. This aqueous composition of insoluble particles is particularly useful for flocculation, for instance flocculation of sewage sludge followed by centrifugation or belt pressing, or for viscosification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.