Process for preparing dimethylaminomethylenebis(phosphonic acid)
US4157364A · kind A · utility
8Cited by
4References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 8, 1978 |
| Grant date | Jun 5, 1979 |
| Priority date | — |
| Expiry date | Feb 8, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F11/08
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Dimethylaminomethylenebis(phosphonic acid) is prepared by reacting dimethylformamide with phosphorous trichloride and treating the reaction mixture with alcohols or glycols and water. The phosphonic acid is combined with water soluble carboxylic acid polymers for use as a corrosion and scale inhibitor in aqueous systems. These compositions may also be combined with phosphorous acid and water soluble zinc salts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.