Enhanced melting point rinse aid solid compositions with synergistic preservative

• US 8,383,570 B2
• Filed: 05/24/2012
• Issued: 02/26/2013
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Kieffer, Janel Marie, Man, Victor Fuk-Pong
• Primary Examiner(s): Mruk, Brian P
• Application Number:
  US13/480,121
• Publication Number:
  US 20120245074A1
• Time in Patent Office: 278 Days
• Field of Search: 510/197, 510/445, 510/457, 510/475, 510/492, 510/501, 510/524
• US Class Current: 510/445
• CPC Class Codes: C11D 1/008 Polymeric surface-active agents
• CPC Class Codes: C11D 1/146 Sulfuric acid esters
• CPC Class Codes: C11D 1/72 Ethers of polyoxyalkylene glycols
• 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 3/0026 Low foaming or foam regulating compositions
• CPC Class Codes: C11D 3/046 Salts
• CPC Class Codes: C11D 3/2075 Carboxylic acids-salts thereof
• CPC Class Codes: C11D 3/323 urea or derivatives thereof
• CPC Class Codes: C11D 3/3707 Polyethers, e.g. polyalkyleneoxides
• CPC Class Codes: C11D 3/48 Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
• CPC Class Codes: C11D 7/10 Salts
• CPC Class Codes: C11D 7/265 Carboxylic acids or salts thereof

Abstract

The invention includes a GRAS preservative system including sodium bisulfate and a combination of specific organic acids that act in a synergistic capacity. The preservative further has the benefit of a higher melting point of approximately 110° or higher making it particularly suited for solid wash applications. According to the invention it has surprisingly been found that a combination of sodium bisulfate, sorbic acid, and benzoic acid produced better preservative properties than other organic acid combinations or each acid by itself.

Claims

1. A preservative composition comprising:

from about an effective amount of sodium bisulfate, to bring the composition to a pH of about 2 and

a combination of acids consisting of benzoic and sorbic acids, wherein said each acid is present in an amount of from about 0.5 wt. % to about 20 wt. % with any remainder being water.

2. The preservative composition of claim 1 where said benzoic and sorbic acids are present in equal wt. %.

3. The preservative composition of claim 1 wherein said sodium bisulfate is present in an amount for from about 70 wt. % to about 95 wt. % and said acids are each present in an amount of from about 2.5 wt. % to about 15 wt. % each.

4. The preservative composition of claim 3 where said benzoic and sorbic acids are present in equal wt. %.

5. The preservative composition of claim 1 wherein said sodium bisulfate is present in an amount for from about 80 wt. % to about 90 wt. % and said acids are each present in an amount of from about 5 wt. % to about 10 wt. % each.

6. The preservative composition of claim 5 where said benzoic and sorbic acids are present in equal wt. %.

7. The preservative composition of claim 1 further comprising an anti-microbial.

8. The preservative composition of claim 1 further comprising a chelant.

9. The preservative composition of claim 1 further comprising sodium sulfate.

10. The preservative composition of claim 1 where said composition is a solid composition.

11. The preservative composition of claim 10 wherein said composition has as melt point of greater than 110°

F.

12. A solid rinse aid/detergent composition comprising a preservative consisting of:

from about 60 wt. % to about 99 wt. % of sodium bisulfate, and

a combination of acids consisting of benzoic and sorbic acids, wherein said each acid is present in an amount of from about 0.5 wt. % to about 20 wt. % with any remainder being water.

13. The solid composition of claim 12 wherein said solid composition includes a solid matrix comprising urea and sodium sulfate.

14. The solid composition of claim 12 wherein said composition comprises a melt point of greater than 110°

F.

15. The solid composition of claim 12 wherein said sodium bisulfate is present in an amount of about 85 wt. % and said sorbic acid is present in an amount of 7.5 wt. % and said benzoic acid is present in an amount of 7.5 wt. %.

16. The solid composition of claim 12 wherein said sodium bisulfate, sorbic acid, and benzoic acid are present in a ratio of 13.34:

1;

1, respectively.

17. The solid composition of claim 12 wherein said composition includes a solid matrix of polyethylene glycol and urea.

18. The solid composition of claim 12 wherein said solid is a solid cast composition.

19. The solid composition of claim 12 wherein said solid is an extruded solid composition.

20. A solid rinse aid composition comprising:

sodium sulfate;

urea;

water;

a sheeting agent comprising one or more alcohol ethoxylates;

a defoamer component comprising a polymer compound including one or more ethylene oxide groups;

a preservative consisting of sodium bisulfate;

sorbic acid and benzoic acid;

wherein said sodium sulfate and urea are present in an amount sufficient for solidification of the rinse aid composition.