Stable solid block metal protecting warewashing detergent composition

• US 7,087,569 B2
• Filed: 11/14/2003
• Issued: 08/08/2006
• Est. Priority Date: 01/13/1997
• Status: Expired due to Term

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab, Inc.
• Inventors: Man, Victor F., Olson, Keith E., Lentsch, Steven E.
• Primary Examiner(s): Douyon, Lorna M.
• Application Number:
  US10/714,355
• Publication Number:
  US 20040102353A1
• Time in Patent Office: 998 Days
• Field of Search: 510/445, 510/224, 510/233, 510/469, 510/509, 510/511, 510/298, 510/446
• US Class Current: 510/445
• CPC Class Codes: C11D 17/0047 Detergents in the form of bars or tablets
• CPC Class Codes: C11D 17/0052 Cast detergent compositions
• CPC Class Codes: C11D 17/0065 Solid detergents containing builders C11D17/06 takes precedence
• CPC Class Codes: C11D 3/06 Phosphates, including polyphosphates
• CPC Class Codes: C11D 3/08 Silicates
• CPC Class Codes: C11D 3/10 Carbonates ; Bicarbonates
• CPC Class Codes: C11D 3/361 Phosphonates, phosphinates or phosphonites
• CPC Class Codes: C11D 3/364 containing nitrogen
• CPC Class Codes: C11D 7/12 Carbonates bicarbonates
• CPC Class Codes: C11D 7/36 containing phosphorus

Abstract

The dimensionally stable alkaline solid block warewashing detergent uses an E-form binder forming a solid comprising a sodium carbonate source of alkalinity, a metal corrosion protecting alkali metal silicate composition, a sequestrant, a surfactant package and other optional material. The solid block is dimensionally stable and highly effective in removing soil from the surfaces of dishware in the institutional and industrial environment. The E-form hydrate comprises an organic phosphonate and a hydrated carbonate.

Claims

1. A solid detergent composition comprising:

a solidified mixture comprising;

bleaching agent, enzyme, or bleaching agent and enzyme;

an alkali metal silicate having a M₂O;

SiO₂ ratio of about 1;

1 to 1;

5;

about 10 to 80 wt-% of Na₂CO₃;

an effective amount of an organic phosphonate hardness sequestering agent;

about 5 to 20 wt-% anhydrous sodium carbonate;

a binding agent comprising sufficient amounts of hydrated sodium carbonate and phosphonate, to form the composition; and

no second source of alkalinity or less than a solidification interfering amount of a second source of alkalinity;

wherein the mixture hardens to a solid form and the composition provides metal protection.

2. The composition of claim 1, wherein the enzyme comprises lipase, protease, or amylase.

3. The composition of claim 1, wherein the bleaching agent comprises an active oxygen source.

4. The composition of claim 1, wherein the organic phosphonate comprises:

aminotri(methylenephosphonic acid);

1 -hydroxyethane-1,1-diphosphonic acid;

aminotri(methylenephosphonate), sodium salt;

2-hydroxyethyliminobis(methylenephosphonic acid);

diethylenetriaminepenta(methylenephosphonic acid);

dietylenetriaminepenta(methylenephosphonate), sodium salt;

hexamethylenediamine(tetramethylenephosphonate), potassium salt;

bis(hexamethylene)triamine(pentamethylenephosphonic acid);

or mixtures thereof.

5. The composition of claim 1, wherein the composition is provided in the form of a powder, a pellet, a block, or a mixture thereof.

6. The composition of claim 1, wherein the composition comprises about 0.1 to less than about 2.0 moles of water per mole of sodium carbonate.

7. The composition of claim 1, wherein the organic phosphonate comprises a potassium phosphonate present in an amount of about 0.5 to 20 wt-% of the mixture.

8. The composition of claim 1, wherein the composition comprises about 3 to 20 wt-% of the organic phosphonate and additionally comprises a tripolyphosphate sequestrant.

9. The composition of claim 1, wherein the composition comprises about 10 to 30 wt-% of the alkali metal silicate.

10. A solid detergent composition comprising:

solidified mixture comprising;

alkali metal silicate having a M₂O;

SiO₂ ratio of about 1;

1 to 1;

5;

about 10 to 80 wt-% of Na₂CO₃, comprising anhydrous sodium carbonate and hydrated sodium carbonate;

organic phosphonate; and

effective solidifying amount of binding agent comprising the hydrated sodium carbonate and the organic phosphonate;

wherein the mixture hardens to a solid form and the composition provides metal protection.

11. A solid detergent composition comprising:

a solidified mixture comprising;

an alkali metal silicate having a M₂O;

SiO₂ratio of about 1;

1 to 1;

5;

about 10 to 80 wt-% of Na₂CO₃;

an effective amount of an aminocarboxylic acid hardness sequestering agent;

about 5 to 20 wt-% anhydrous sodium carbonate; and

a binding agent comprising sufficient amounts of hydrated sodium carbonate an organic phosphonate aminocarboxylic acid and to form the composition;

wherein the mixture hardens to a solid form and the composition provides metal protection.

12. The composition of claim 11, comprising about 5–

60 wt-% aminocarboxylic acid.

13. The composition of claim 11, wherein the aminocarboxylic acid comprises n-hydroxyethyliminodiacetic acid, nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), N-hydroxyethyl-ethylenediaminetriacetic acid (HEDTA), diethylenetriaminepentaacetic acid (DTPA), or mixtures thereof.

14. The composition of claim 11, further comprising enzyme.

15. The composition of claim 11, further comprising bleaching agent.

16. The composition of claim 11, wherein the composition is provided in the form of a powder, a pellet, a block, or a mixture thereof.