Method of treating aqueous systems with phosphonoadipic acids
US4265769A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1979 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Oct 22, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/4006
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A compound or mixture of compounds of the general formula: ##STR1## in which m and n may be 0 or 1 but both cannot be 1, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are independently H or CH.sub.3, X.sup.1, X.sup.2, Z.sup.1 and Z.sup.2 are independently hydrogen or straight or branched chain C.sub.1 -C.sub.4 alkyl; and the water-soluble inorganic or organic salts thereof, with the proviso that at least one of R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 must be CH.sub.3, and when m and n are both 0, R.sup.2 and R.sup.3 are each methyl and R.sup.4 and R.sup.5 have their previous significance, when added to an aqueous system imparts one or more of the following beneficial effects to be treated system: PA1 (a) the corrosion of ferrous metals in contact with the system is inhibited; PA1 (b) the precipitation of scale-forming salts of calcium, magnesium, barium and strontium from the treated aqueous system is inhibited; and, PA1 (c) inorganic materials present in the treated aqueous system are dispersed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.