Synergistic stain removal through novel MGDA/GLDA/STPP chelator combination

• US 10,246,667 B2
• Filed: 06/13/2018
• Issued: 04/02/2019
• Est. Priority Date: 09/09/2013
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Foster, Tobias, Gohl, David W., Klose, Sven, Kullwitz, Dirk, Mansergh, John, Meier, Timothy, Pathicheril, Beana
• Primary Examiner(s): Boyer, Charles I
• Application Number:
  US16/006,930
• Publication Number:
  US 20180291310A1
• Time in Patent Office: 293 Days
• CPC Class Codes: C11D 2111/14 Hard surfaces
• CPC Class Codes: C11D 3/06 Phosphates, including polyphosphates
• CPC Class Codes: C11D 3/10 Carbonates ; Bicarbonates
• CPC Class Codes: C11D 3/33 Amino carboxylic acids
• CPC Class Codes: C11D 7/12 Carbonates bicarbonates
• CPC Class Codes: C11D 7/16 Phosphates including polyphosphates
• CPC Class Codes: C11D 7/3245 Aminoacids

Abstract

The invention relates to a concentrated detergent composition comprising an alkali metal carbonate, methylglycinediacetic acid, glutamic acid N,N-diacetic acid, and alkali metal tripolyphosphate. The composition is particularly suited to remove tea and coffee soil in warewashing applications.

Claims

1. A concentrated detergent composition comprising:

an alkali metal carbonate,

methylglycinediacetic acid,

glutamic acid N,N-diacetic acid, and

alkali meta tripolyphosphate;

wherein the total concentration of methylglycinediacetic acid, glutamic acid N,N-di acetic acid, and alkali metal tripolyphosphate is 14 to 28% by weight, and the molar ratio of glutamic acid N,N-diacetic acid to the sum of methylglycinediacetic acid and alkali metal tripolyphosphate is 0.03 to 29.

2. The concentrated detergent composition according to claim 1, wherein the molar ratio of methylglycinediacetic acid to alkali metal tripolyphosphate is 0.14 to 14.3.

3. The concentrated detergent composition according to claim 1, wherein the molar ratio of the sum of glutamic acid N,N-diacetic acid, methylglycinediacetic acid and alkali metal tripolyphosphate to alkali metal carbonate is 0.01 to 0.5.

4. The concentrated detergent composition according to claim 1, wherein the composition comprises at least 5% by weight alkali metal carbonate.

5. The concentrated detergent composition according to claim 1, wherein the alkali metal carbonate is sodium or potassium carbonate, sodium or potassium bicarbonate, sodium or potassium sesquicarbonate, or a mixture thereof.

6. The concentrated detergent composition according to claim 1, wherein the alkali metal tripolyphosphate is sodium tripolyphosphate.

7. The concentrated detergent composition according to claim 1, wherein the composition provides a pH of at least 6 when diluted in distilled water at a concentration of 1 g/l and measured at a temperature of 20°

C.

8. The concentrated detergent composition according to claim 1, wherein the composition further comprises at least one of the compounds selected from the group consisting of surfactants, bleaching agents, activating agents, chelating/sequestering agents, silicates, detergent fillers or binding agents, defoaming agents, anti-redeposition agents, enzymes, dyes, odorants, catalysts, threshold polymers, soil suspension agents, antimicrobials and mixtures thereof.

9. The concentrated detergent composition according to claim 1, wherein the composition is provided in the form of a solid, a powder, a liquid, a gel, or a paste.

10. An aqueous solution comprising 0.1 to 10 g/l of the concentrated detergent composition according to claim 1.

11. A method of warewashing comprising:

obtaining the concentrated detergent composition according to claim 1;

introducing said concentrated detergent composition to soiled dishware as a warewashing detergent for the removal of soil comprising oxidized polyphenols and calcium silicates.

12. The method according to claim 11, wherein the concentrated detergent composition is diluted to provide a use solution with a concentration of 0.1 to 10 g/l.

13. The method according to claim 12, wherein the concentrated detergent composition is diluted with water having a hardness of at least 50 mg/l CaCO₃.

14. The method according to claim 11, wherein the warewashing detergent is used for the removal of tea and coffee soil.