Phosphonomethylated polyvinylamines and preparation and use thereof
AssigneeBASF SE
InventorsJuergen Mohr, Knut Oppenlaender, Walter Denzinger, Heinrich Hartmann, Richard Baur, Charalampos Gousetis, Alexander Kud
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Abstract
Phosphonomethylated poly-vinylamines which contain as characteristic structural elements units of the formula where R1 is hydrogen, C1-C6-alkyl or and X is hydrogen, an alkali metal, ammonium or one equivalent of an alkaline earth metal, are obtainable by phosphonomethylation of polymers which contain N-vinyl-amide or vinylamine groups and are useful as detergent additives and water treatment agents.
Claims14
In a water-carrying system subject to the formation of scale, the improvement comprising the water in said water-carrying system comprises from 0.1-100 ppm of a phosphonomethylated polyvinylamine which contains as characteristic structural elements, units of the formula
- wherein R1 is hydrogen, C1-C6-alkyl or
- and X is hydrogen an alkali metal, ammonium or one equivalent of an alkaline earth metal;
- wherein said polymer has a K value of from 10 to 100.
A method of inhibiting scale deposition in a water-carrying system subject to scale formation comprising adding to said system a scale deposition inhibiting amount of a phosphonomethylated polyvinylamine which contains as characteristic structural elements, units of the formula
- wherein R1 is hydrogen, C1-C6-alkyl or
- and X is hydrogen, an alkali metal, ammonium or one equivalent of an alkaline earth metal;
- wherein said polymer has a K value of from 10 to 100.
Dependencies are inferred from the claim text.