Phosphonomethylated polyvinylamines and preparation and use thereof

• US 6,264,839 B1
• Filed: 07/12/1993
• Issued: 07/24/2001
• Est. Priority Date: 08/07/1989
• Status: Expired due to Fees

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Kud, Alexander, Baur, Richard, Denzinger, Walter, Hartmann, Heinrich, Mohr, Juergen, Gousetis, Charalampos, Oppenlaender, Knut
• Primary Examiner(s): Zitomer, Fred
• Application Number:
  US08/089,436
• Time in Patent Office: 2,934 Days
• Field of Search: 525/383, 525/340, 252/80, 252/82, 210/700, 210/699, 210/687, 526/278, 526/277, 526/310, 526/312
• US Class Current: 210/687
• CPC Class Codes: C08F 8/40 Introducing phosphorus atoms or phosphorus-containing groups
• CPC Class Codes: Y02W 10/37 using solar energy

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.

Claims

1. 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.

2. The water-carrying system of claim 1, wherein R¹ is CH₂—

PO₃X₂.

6. The water-carrying system of claim 1, wherein said phosphonomethylated polyvinylamine is obtained by hydrolyzing and phosphonomethylating a copolymer containing 5-95 mol % of N-vinylformamide.

7. The water-carrying system of claim 6, wherein said phosphonomethylated polyvinylamine is obtained by exhaustively phosphonomethylating said copolymer.

8. The water-carrying system of claim 6, wherein said phosphonomethylated polyvinylamine is obtained by incompletely phosphonomethylating said copolymer.

11. The method of claim 8, wherein said phosphonomethylated polyvinylamine is obtained by incompletely phosphonomethylating said copolymer.

12. The water-carrying system of claim 1, wherein said water-carrying system is an open or closed cooling cycle.

13. The water-carrying system of claim 12, wherein said system is selected from the group consisting of a reactor, a distillation apparatus, a boiler and a steam generator.

14. The water-carrying system of claim 1, wherein said system is used for desalting of sea water or brackish sea water by a distillation or membrane process.

3. 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.

4. The method of claim 3, wherein said phosphonomethylated polyvinylamine is added in an amount of from 0.1 to 100 ppm.

5. The method of claim 3, wherein R¹ is CH₂—

PO₃X₂.

9. The method of claim 3, wherein said phosphonomethylated polyvinylamine is obtained by hydrolyzing and phosphonomethylating a copolymer containing 5-95 mol % of N-vinylformamide.

10. The method of claim 3, wherein said phosphonomethylated polyvinylamine is obtained by exhaustively phosphonomethylating said copolymer.