Warewashing composition for use in automatic dishwashing machines, and methods for manufacturing and using

• US 20060270580A1
• Filed: 08/07/2006
• Published: 11/30/2006
• Est. Priority Date: 07/02/2003
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab, Inc.
• Inventors: Smith, Kim R., Man, Victor F., Olson, Keith E., Lentsch, Steven E., Bartelme, Michael J., Baum, Burton M., Kestell, Howie, Everson, Terence P.
• Granted Patent: US 7,452,853 B2
• Time in Patent Office: Days
• US Class Current: 510/220
• CPC Class Codes: C11D 17/0052 Cast detergent compositions
• CPC Class Codes: C11D 3/0073 Anticorrosion compositions
• CPC Class Codes: C11D 3/02 Inorganic compounds ; Elemental compounds
• CPC Class Codes: C11D 3/044 Hydroxides or bases
• CPC Class Codes: C11D 3/046 Salts
• CPC Class Codes: C11D 3/10 Carbonates ; Bicarbonates
• CPC Class Codes: C11D 3/12 Water-insoluble compounds
• CPC Class Codes: C11D 3/2075 Carboxylic acids-salts thereof

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 a source of zinc ion. The relative amounts of the source of zinc ion and the source of aluminum ion can be controlled to reduce visible filming when the warewashing detergent composition is used in the presence of hard water. Methods for using and manufacturing a warewashing detergent composition are provided.

Claims

1-15. -15. (canceled)

16. A warewashing detergent composition comprising:

(a) a cleaning agent comprising a detersive amount of a surfactant;

(b) an alkaline source in an amount effective to provide the warewashing detergent composition with a pH of at least about 8; and

(c) between about 6 ppm and about 300 ppm of a corrosion inhibitor for reducing corrosion of glass, the corrosion inhibitor comprising a zinc ion and an aluminum ion at a weight ratio of the zinc ion to the aluminum ion of at least about 2;

1.

17. A warewashing detergent composition according to claim 16, wherein the weight ratio of the zinc ion to the aluminum ion is between about 20:

1 and about 3;

1.

18. A warewashing detergent composition according to claim 16, wherein the warewashing detergent composition has a solids content of between about 0.05 wt. % and about 0.75 wt. %.

19. A warewashing detergent composition comprising:

(a) a cleaning agent comprising a detersive amount of a surfactant;

(b) an alkaline source in an amount effective to provide the warewashing detergent composition with a pH of at least about 8 when the warewashing detergent composition is provided as a use composition; and

(c) between about 0.5 wt. % and about 25 wt. % of a corrosion inhibitor for reducing corrosion of glass, the corrosion inhibitor comprising a source of zinc ion and a source of aluminum ion at a weight ratio of zinc ion to aluminum ion of at least about 2;

1.

20. A warewashing detergent composition according to claim 19, wherein the cleaning agent is provided in the warewashing detergent composition in an amount of between about 0.5 wt. % and about 20 wt. %.

21. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises about 0.1 wt. % to about 70 wt. % chelating/sequestering agent.

22. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises about 0.1 wt. % to about 60 wt. % bleaching agent.

23. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises about 1 wt. % to about 20 wt. % detergent filler.

24. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises about 0.01 wt. % and about 3 wt. % defoaming agent.

25. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises about 0.5 wt. % to about 10 wt. % anti-redeposition agent.

26. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises about 5 wt. % to about 60 wt. % water.

27. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises about 0.1 wt. % to about 10 wt. % water.

28. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises a block having a size of at least about 5 grams.

29. A warewashing detergent composition according to claim 19, wherein the warewashing detergent composition comprises a block having a size of at least about 50 grams.

30. A warewashing detergent composition according to claim 19, further comprising a water-soluble packaging material enclosing the warewashing detergent composition.

31. A warewashing detergent composition according to claim 30, wherein the water-soluble packaging material comprises polyvinyl alcohol.

32. A warewashing detergent composition according to claim 31, wherein the warewashing detergent composition is provided within the water-soluble packaging material in an amount sufficient to provide a unit dose for application in a dishwashing machine.

33. A warewashing detergent composition according to claim 31, wherein the warewashing detergent composition is provided in the form of a liquid.

34. A warewashing detergent composition according to claim 31, wherein the warewashing detergent composition is provided in the form of a solid.

35-53. -53. (canceled)

54. A method for manufacturing a warewashing detergent composition, the method comprising:

(a) providing an amount of corrosion inhibitor in a warewashing detergent composition concentrate sufficient to provide a level of corrosion inhibitor in a use composition as a result of diluting the warewashing detergent concentrate with water at a ratio of water to the warewashing detergent concentrate of at least about 20;

1 corresponding to the following formula;

Corrosion inhibitor use composition (ppm)>

[alkalinity (ppm)+builder (ppm)]/[hardness (grains/gallon)+food soil (grams/gallon)]+[alkalinity (ppm)+builder (ppm)−

200]/20+10

wherein the alkalinity refers to the alkalinity in ppm of the use composition,

the builder refers to the amount of builder in ppm in the use composition,

the hardness refers to the amount of hardness in grains per gallon in the use composition, and

the food soil refers to the expected amount of food soil in grams per gallon in the use composition; and

wherein the corrosion inhibitor comprises a weight ratio of zinc ion to aluminum ion of between about 20;

1 and about 2;

1, and the warewashing detergent composition concentrate further comprises a cleaning agent.

55. A method according to claim 54, further comprising:

(a) solidifying the warewashing detergent concentrate.

56. A method according to claim 54, wherein the warewashing detergent concentrate comprises between about 0.01 wt. % and about 20 wt. % of the cleaning agent.

57. (canceled)