Method of inhibiting scaling in aqueous systems with low molecular weight copolymers
US4530766A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1984 |
| Grant date | Jul 23, 1985 |
| Priority date | — |
| Expiry date | Sep 24, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F5/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for inhibiting scale formation in aqueous systems using water-soluble, low molecular weight copolymers of unsaturated aliphatic carboxylic acids is provided. Copolymers formed from about 30 to about 70 weight percent acrylic acid and from about 70 to about 30 weight percent methacrylic acid, having a weight average molecular weight ranging from about 2000 to about 5000, are preferred for inhibiting the formation of common hardness ion salt scale such as calcium carbonate, calcium phosphate and barium sulfate. The copolymers are hydrolytically stable and can be used effectively in high temperature applications. The copolymers are also effective dispersants for suspended inorganic particulate materials, such as clay, in aqueous systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.