Aqueous solution containing combination of complexing agents

Patent metadata

Field	Value
Publication number	US-10160937-B2
Application number	US-201515529820-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Nov 26, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

Aqueous formulation with a content of (A) and (B) in the range of 40% to 60%, containing
(A) a complexing agent selected from methylglycine diacetic acid (MGDA) that is at least partially neutralized with alkali metal, and at least one complexing agent other than MGDA selected from (B) glutamic acid diacetic acid (GLDA) that is at least partially neutralized with alkali metal, and, optionally, (C) a polymer being selected from polyamines, the N atoms being partially or fully substituted with CH 2 COOH groups, partially or fully neutralized with alkali metal cations, and, optionally, (D) at least one alkali metal salt of an organic acid, said acid being selected from mono- and dicarboxylic acids,

wherein the weight ratio of complexing agent (A) to complexing agent (B) is in the range of from 10:1 to 1:10.

First claim

The invention claimed is:

1. An aqueous formulation with a content of (A) and (B) in the range of 40% to 60%, containing
(A) a complexing agent selected from methylglycine diacetic acid (MGDA) that is at least partially neutralized with alkali metal, and at least one complexing agent other than MGDA selected from
(B) glutamic acid diacetic acid (GLDA) that is at least partially neutralized with alkali metal, and, optionally,
(C) a polymer being selected from polyamines, the N atoms being partially or fully substituted with CH 2 COOH groups, partially or fully neutralized with alkali metal cations, and, optionally,
(D) at least one alkali metal salt of an organic acid, said acid being selected from mono- and dicarboxylic acids,
wherein the weight ratio of complexing agent (A) to complexing agent (B) is in the range of from 10:1 to 1:10.

2. The aqueous formulation according to claim 1 , wherein polymer (C) is selected from polyalkylenimines and polyvinylamines, partially or fully substituted with CH 2 COOH groups, partially or fully neutralized with alkali metal cations.

3. The aqueous formulation according to claim 1 , wherein salt (D) is selected from potassium formate and potassium acetate.

4. The aqueous formulation according to claim 1 , wherein said aqueous formulation has a pH value in the range of from 10.5 to 11, determined at a 1% by weight aqueous solution.

5. The aqueous formulation according to claim 1 , wherein the weight ratio of complexing agent (A) to complexing agent (B) is in the range of from 4:1 to 1:4.

6. The aqueous formulation according to claim 1 , wherein the weight ratio of complexing agent (A) to complexing agent (B) is in the range of from 1.5:1 to 1:1.5.

7. The aqueous formulation according to claim 1 wherein said aqueous formulation has a dynamic viscosity in the range of from 100 to 400 mPa·s, determined according to DIN 53018-1:2008-09 at 25° C.

8. The aqueous formulation according to claim 1 wherein said formulation has a total solids content in the range of 40 to 70%.

9. The aqueous solution according to claim 1 wherein complexing agent (B) is essentially L-glutamic acid (L-GLDA) that is at least partially neutralized with alkali metal.

10. The aqueous formulation according to claim 1 containing
in the range of from 10 to 50% by weight of complexing agent (A),
in the range of from 10 to 50% by weight of complexing agent (B),
in the range of from zero to 5% by weight of polymer (C),
in the range of from zero to 30% by weight of salt (D),
percentages referring to the total solids of the respective aqueous solution.

11. The aqueous formulation according to claim 1 wherein such formulation is phosphate-free.

12. The aqueous formulation according to claim 1 wherein such formulation comprises a plasticizer.

13. A process for making an aqueous solution according to claim 1 , comprising the step of combining an aqueous solution of complexing agent (A) with solid complexing agent (B) and salt (D).

14. The process for making an aqueous solution according to claim 1 , comprising the steps of combining an aqueous solution of complexing agent (A) with an aqueous solution of complexing agent (B) and an aqueous solution of salt (D).

15. Use of aqueous solutions according to claim 1 for transportation in a pipe or a container.

Assignees

• Basf Se
• Procter & Gamble

Inventors

• Reinoso Garcia Marta
• Biel Markus Christian
• Boeckh Dieter
• Letzelter Nathalie Sophie
• Murkunde Rohan Govind
• Huelskoetter Frank
• Goodall Kevin George

Classifications

• C11D7/32

  containing nitrogen · CPC title

• C11D7/265

  Carboxylic acids or salts thereof · CPC title

• C11D3/3773

  in liquid compositions · CPC title

• C11D3/3723

  Polyamines or polyalkyleneimines · CPC title

• C11D3/33 Primary

  Amino carboxylic acids · CPC title