Method of stabilizing aqueous systems
US4711725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1986 |
| Grant date | Dec 8, 1987 |
| Priority date | — |
| Expiry date | May 7, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F14/02
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for stabilizing aqueous systems containing scale forming salts and inorganic particulates by adding to such systems an effective amount of selected low molecular weight water soluble polymers containing from about 10 to about 84 weight percent (meth)acrylic acid units, greater than 11 to less than about 40 weight percent acrylamido alkyl or aryl sulfonate units and from at least about 5 to about 50 weight percent of one or more units selected from vinyl esters, vinyl acetate and substituted acrylamides, is provided. The terpolymers and interpolymers used in the process provide improved phosphate, iron and zinc stabilization while maintaining their water solubility. Certain preferred polymers also exhibit a high degree of hydrolytic stability at high pH conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.