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

Patent metadata

Field	Value
Publication number	US-10246667-B2
Application number	US-201816006930-A
Country	US
Kind code	B2
Filing date	Jun 13, 2018
Priority date	Sep 9, 2013
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

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.

First claim

The invention claimed is:

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 CaCO 3 .

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

Assignees

• Ecolab Usa Inc

Inventors

• Foster Tobias
• Gohl David W
• Klose Sven
• Kullwitz Dirk
• Mansergh John
• Meier Timothy
• Pathicheril Beana

Classifications

• C11D7/3245

  Aminoacids · CPC title

• C11D3/33

  Amino carboxylic acids · CPC title

• C11D7/16

  Phosphates including polyphosphates · CPC title

• C11D7/12

  Carbonates {bicarbonates} · CPC title

• C11D3/10 Primary

  Carbonates {; Bicarbonates} · CPC title