Method for treating fouled water
US3951791A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1973 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Sep 7, 1993 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/54
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An aqueous dispersion of a polymer having a cationic charge on the surface of the polymer particles is used for treatment of fouled water. Said aqueous dispersion contains quaternary ammonium salt or inorganic or organic acid salt of a copolymer obtained by emulsion polymerization of, in the presence of a cationic surfactant, (a) 0.1 - 8.0% by weight based on total monomers of at least one .alpha.,.beta.-ethylenically unsaturated monomers containing basic nitrogen or at least one .alpha.,.beta.-ethylenically unsaturated monomers containing halogen and other (b) .alpha.,.beta.-ethylenically unsaturated monomers and/or (c) conjugate diene monomers, (b) and (c) being copolymerizable with said monomer (a). Said aqueous cationic dispersion is especially effective for treatment of fouled water containing anionic latexes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.