Warewashing composition for use in automatic dishwashing machines

• US 7,759,299 B2
• Filed: 07/24/2006
• Issued: 07/20/2010
• Est. Priority Date: 07/24/2006
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab, Inc.
• Inventors: Smith, Kim R., Olson, Keith E., Bartelme, Michael J.
• Primary Examiner(s): Boyer; Charles I
• Application Number:
  US11/491,784
• Publication Number:
  US 20080020960A1
• Time in Patent Office: 1,457 Days
• Field of Search: 510/220, 510/224, 510/225, 510/227, 510/233, 510/445, 510/446, 510/485, 510/508, 510/514
• US Class Current: 510/224
• CPC Class Codes: C11D 17/003 Colloidal solutions, e.g. gels; Thixotropic solutions or pastes
• CPC Class Codes: C11D 3/0073 Anticorrosion compositions
• CPC Class Codes: C11D 3/0084 Antioxidants; Free-radical scavengers
• CPC Class Codes: C11D 3/046 Salts

Abstract

A warewashing detergent composition is provided according to the invention. The warewashing detergent composition includes a cleaning agent, an alkaline source, and a corrosion inhibitor. The cleaning agent comprises a detersive amount of a surfactant. The alkaline source is provided in an amount effective to provide a use composition having a pH of at least about 8. The corrosion inhibitor includes a source of aluminum ion and at least one of a source of calcium ion or a source of magnesium ion. The amounts of calcium ion or magnesium ion can be selected depending upon the hardness of the water of dilution. Methods for using a warewashing detergent composition are provided.

Claims

1. A warewashing detergent composition comprising:

(a) a cleaning agent comprising a detersive amount of a surfactant wherein the detergent composition comprises about 0.05 wt. % to 5 wt. % of the surfactant;

(b) an alkaline source in an amount effective to provide a use composition having a pH of at least about 8 when measured at a solids concentration of about 0.5 wt. %; and

(c) a corrosion inhibitor in an amount sufficient for reducing corrosion of glass when the warewashing detergent composition is combined with water of dilution at a dilution ratio of dilution water to detergent composition of at least about 20;

1, the corrosion inhibitor comprising;

(i) a source of water soluble aluminum ion selected from the group consisting of sodium aluminate, aluminum bromide, aluminum chlorate, aluminum chloride, aluminum iodide, aluminum nitrate, aluminum sulfate, aluminum acetate, aluminum formate, aluminum tartrate, aluminum lactate, aluminum bromate, aluminum borate, aluminum potassium sulfate, aluminum zinc sulfate, aluminum phosphate, or mixtures thereof; and

(ii) at least one of a source of water soluble calcium ion selected from the group consisting of calcium borate, calcium perborate, calcium percarbonate, calcium acetate, calcium arsenate, calcium arsenide, calcium azide, calcium benzoate, calcium meta-borate, calcium hexa-boride, calcium bromate, calcium bromide, calcium di-carbide, calcium carbonate, calcium chlorate, calcium chloride, calcium chlorite, calcium chromate, calcium citrate, calcium cyanamide, calcium cyanide, calcium diphosphate, calcium dithionate, calcium fluoride, calcium difluoride hexakisphosphate, calcium formate, calcium d-gluconate, calcium glycerophosphate, calcium hydride, calcium hydrogen phosphate, calcium hydrogen sulfide, calcium hydroxide, calcium hypochlorite, calcium iodate, calcium lactate, calcium nitrate, calcium nitride, calcium nitrite, calcium pantothenate, calcium perchlorate, calcium permanganate, calcium peroxide, calcium phosphate, calcium phosphide, calcium phosphinate, calcium salicylate, calcium selenate, calcium selenide, calcium silicate, calcium di-silicide, calcium silicon oxide, calcium silicon titanium oxide, calcium stearate, calcium succinate, calcium sulfate, calcium sulfide, calcium sulfite, calcium tartrate, calcium meso-tartrate-3-water telluride, calcium thiosulfate, calcium tungstate, or mixtures thereof;

or a source of water soluble magnesium ion selected from the group consisting of magnesium acetate, magnesium bromate, magnesium bromide, magnesium chlorate, magnesium chloride, magnesium chromate, magnesium citrate, magnesium formate, magnesium iodate, magnesium iodide, magnesium lactate, magnesium molybdate, magnesium nitrate, magnesium oleate, magnesium perchlorate, magnesium phosphinate, magnesium salicylate, magnesium sulfate, magnesium thiosulfate, or mixtures thereof; and

either

a. when the corrosion inhibitor comprises a calcium/aluminum corrosion inhibitor the molar ratio of calcium ion to aluminum ion is less than about 1;

4 or a molar ratio of calcium ion to aluminum ion is greater than about 2;

1;

or

b. when the corrosion inhibitor comprises a magnesium/aluminum corrosion inhibitor the molar ratio of magnesium ion to aluminum ion comprises 3 or more magnesium ions per aluminum ion or 3 or more aluminum ions per magnesium ion, and wherein

d) the detergent composition is substantially free of zinc and is provided as a solid block.

2. A warewashing detergent composition according to claim 1, wherein the cleaning agent comprises an anionic surfactant, a nonionic surfactant, a cationic surfactant, or a zwitterionic surfactant.

3. A warewashing detergent composition according to claim 1, wherein the detergent composition comprises between about 0.05 wt. % and about 15 wt. % of the corrosion inhibitor.

4. A warewashing detergent composition according to claim 1, wherein the composition is free of phosphorous containing compounds.

5. A warewashing detergent composition according to claim 1, wherein the composition comprises about 1 wt. % to about 60 wt. % of a builder, wherein the builder comprises a non-phosphorous containing builder.

6. A warewashing detergent composition according to claim 1, wherein the alkaline source comprises at least one of an alkali metal carbonate, an alkali metal hydroxide, and a mixture thereof.

7. A warewashing detergent composition according to claim 1, wherein the alkaline source comprises at least one of sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium sesquicarbonate, potassium sesquicarbonate, or mixtures thereof.

8. A warewashing detergent composition according to claim 1, wherein the alkaline source comprises at least one of sodium hydroxide, potassium hydroxide, or mixtures thereof.

9. A warewashing detergent composition according to claim 1, wherein the corrosion inhibitor comprises a calcium/aluminum corrosion inhibitor.

10. A warewashing detergent composition according to claim 1, wherein the corrosion inhibitor comprises a magnesium/aluminum corrosion inhibitor.

11. A warewashing detergent composition according to claim 1, wherein the corrosion inhibitor comprises a calcium/magnesium/aluminum corrosion inhibitor.