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1. WO2020159975 - INHIBITION DE TARTRE À L'AIDE DE POLYMÈRES RAMIFIÉS

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

What is claimed is:

1. A method of inhibiting scale formation comprising adding, to a fluid that tends to form a scale, an antiscale agent selected from a polycarboxylic acid, a salt thereof, an ester thereof, a combination of two of the acid, the salt and the ester, or a combination of the salt, acid and the ester characterized by having a polymer backbone and a plurality of branches from the polymer backbone.

2. The method of claim 1 wherein the plurality of branches are two or more branches.

3. The method of claim 1 or 2 wherein the average degree of polymerization of the branches is from 2 to 20.

4. The method of any of the preceding claims wherein there are five or more branches.

5. The method of any of the preceding claims wherein there are no more than 20 branches.

6. The method of any of the preceding claims wherein the polymer backbone has a degree of polymerization of 6 to 100.

7. The method of any of the preceding claims wherein the number average molecular weight of the polycarboxylic acid is from 700 to 50,000 g/mol.

8. The method of any of the preceding claims wherein the polycarboxylic acid is formed from monomers selected from acrylic acid, methacrylic acid, butenoic acid, crotonic acid, itaconic acid, an itaconic acid monoester, fumaric acid, a fumaric acid monoester, maleic acid, a maleic acid monoester, or a combination thereof.

9. The method of any of the preceding claims wherein the scale comprises barium sulfate.

10. The method of any of the preceding claims wherein the scale comprises calcium carbonate.

11. The method of any of the preceding claims wherein the amount of antiscale agent added to the fluid is in the range of 1 to 100 ppm based on total weight of the fluid.

12. The method of claim 11 wherein the amount of antiscale agent is 3 to 20 ppm.

13. The method of any one of the preceding claims wherein the antiscale agent is a polycarboxylic acid or a salt thereof where a portion of the -COO- groups are unhydrolyzed.

14. The method of claim 13 wherein the unhydrolyzed groups have the structure -COORa wherein Ra is a hydrocarbyl group of 1 to 8 carbon atoms.