# US 10,246,667 B2 · Synergistic stain removal through novel MGDA/GLDA/STPP chelator combination

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- Number: US 10,246,667 B2
- Document ID: US10246667B2
- Status: Granted
- Kind: B2
- Application number: 16/006,930
- Filed: 2018-06-13
- Published: 2018-10-11
- Granted: 2019-04-02
- Earliest claimed: 2016-12-09
- Assignees: Ecolab USA Inc.
- Applicants: Ecolab USA Inc.
- Inventors: Tobias Foster; David W. Gohl; Sven Klose; Dirk Kullwitz; John Mansergh; Timothy Meier; Beana Pathicheril
- Web page: https://patentgrep.com/patent/US10246667B2

## CPC

- C11D 3/10: Carbonates {; Bicarbonates}
- C11D 3/06: Phosphates, including polyphosphates
- C11D 3/33: Amino carboxylic acids
- C11D 7/12: Carbonates {bicarbonates}
- C11D 7/16: Phosphates including polyphosphates
- C11D 7/3245: {Aminoacids}
- C11D 2111/14: Hard surfaces
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## 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

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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

### Claim 11 (depends on 1)

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.

### Claim 12 (depends on 11)

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.

### Claim 13 (depends on 12)

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.

### Claim 14 (depends on 11)

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