Scale inhibitors
US6395185B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2000 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Oct 4, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F5/10
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to the inhibition of tripolyphosphate and pyrophosphate scales in aqueous systems involving adding to said aqueous system at least one copolymer comprising the following monomers in polymerized form:(I) 50-80% by weight of one or more weak acids;(II) 2-50% by weight of one or more strong acids;(III) 0-30% by weight of one or more monoethylenically unsaturated C4-C8 dicarboxylic acids; and(IV) 0-30% by weight of one or more monomethylenically unsaturated monomers polymerizable with (I), (II) and (III);wherein the total of monomers (I), (II), (III), and (IV) equals 100% by weight of copolymer.The invention is particularly suited to the inhibition of tripolyphosphate and pyrophosphate scales which occur as a result of using low phosphate (STPP) containing detergent formulations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.