EP0311175B1 - Sanitizer - Google Patents
Sanitizer Download PDFInfo
- Publication number
- EP0311175B1 EP0311175B1 EP88202094A EP88202094A EP0311175B1 EP 0311175 B1 EP0311175 B1 EP 0311175B1 EP 88202094 A EP88202094 A EP 88202094A EP 88202094 A EP88202094 A EP 88202094A EP 0311175 B1 EP0311175 B1 EP 0311175B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- composition
- weight
- composition according
- alkali metal
- bleach
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/395—Bleaching agents
- C11D3/3956—Liquid compositions
Description
- The present invention is concerned with a sanitizing product which contains a hypohalite bleach.
- In industrial machines for bulk warewashing or fabrics washing, it is often desired to add a bleach-based sanitizing product during one or more wash cycles, to ensure an acceptable level of hygiene.
- Unfortunately, for optimum sanitizing performance and acceptable cost, it is necessary to use a hypohalite bleach which, with prolonged use, can lead to spot corrosion of some stainless steel parts. This especially occurs when the machine is not operating, and particularly at spots which are near the spray nozzles for the sanitizer solution.
- It has been known in the past to use an agent like sodium metasilicate to inhibit corrosion. For instance, US-A-3,697,431 discloses a liquid drain opening composition comprising a hypochlorite, a hydroxide and an alkali metal silicate, whereby the silicate is included to reduce the corrosiveness of the composition. However, there are problems in using this effectively in sanitizers of the aforementioned kind. First, any putative corrosion inhibitor must be soluble in an aqueous liquid (such sanitizers must be dosed as liquids). Second, an insufficient level of such inhibitor actually increases corrosion as compared to that observed with equivalent products totally devoid of any inhibitor. Third, at effective levels of inhibitor, there is a real danger of premature decomposition of the bleach.
- We have now found that these problems can be overcome by providing a liquid sanitizer composition comprising at least 2% by weight of a caustic agent, from 0 to 1% of a surfactant and at least 3% by weight of a hypohalite bleach and an amount of an alkali metal neutral silicate such that the weight ratio of silicate ions to free halogen is from 1:5 to 1:1.5 and the weight ratio of the hypohalite bleach to other water-soluble electrolyte in the composition is at most 1:1.
- Hypohalites, such as sodium hypochlorite, exert their sanitizing action by release of free oxygen to leave sodium chloride. Commercially available hypochlorites do indeed contain trace impurities of the corresponding chloride. Thus, in the context of the present invention, the term "free halogen" means the total halogen in the composition, whether as a halide ion or in the form of the corresponding hypohalite.
- Commercially available hypochlorite compositions are characterized by their content of "available chlorine". Methods for determining the "available chlorine" of compositions containing chlorine bleach are well known in the art. In accordance with usual practice, the available chlorine is defined in this application as the amount of chlorine which can be liberated from a composition by acidification and addition of at least one molar equivalent of chloride ions.
- To guard against premature decomposition of the bleach, it is most preferred that the weight ratio of hypohalite bleach to other water-soluble electrolyte in the composition is from 1:2 to 1:1.
- The most preferred hypohalite bleaches are the alkali metal hypochlorites, especially the sodium salt.
- Preferably also, to inhibit calcium deposits on metal surfaces, especially aluminium, the composition further comprises from 1 to 5% of an alkali metal condensed phosphate builder, such as sodium or potassium tripolyphosphate.
- For optimum bleach stability and performance, it is also preferred that the pH of the composition is at least 12.0.
- The caustic agent in the composition is an alkali metal hydroxide or metasilicate, such as sodium hydroxide, potassium hydroxide, sodium metasilicate or potassium metasilicate. The relative amount of sodium and potassium ions in the total composition should be chosen such that there is no precipitation of any tripoly phosphate present, in the form of a precipitate of the sodium salt.
- The surfactant, which may be present in an amount of 0.1% by weight, is essentially a foam depressor.
- The term alkali metal neutral silicate means one in which the ratio of silicate to alkali metal oxide species is greater than 3:1. A typical example is sodium neutral silicate having an SiO₂:Na₂O ratio of 3.4:1.
- The present invention further provides a process of mechanical warewashing comprising dosing an effective sanitizing amount of a composition according to the invention into the wash liquor in a warewashing machine.
- The present invention will now be explained better by way of the following Examples.
- The following compositions were formulated using 6% by weight of a concentrated stock solution of potassium hydroxide containing 50% by weight of potassium hydroxide, and 31.3% by weight of a concentrated stock solution of sodium hypochlorite containing 19.2% by weight of sodium hypochlorite (calculated as available chlorine).
- Examples 1-3, and A were formulated using a low sodium chloride impurity bleach, whereas Examples 4,5,B and C were formulated using a regular grade, resulting in NaCl contents in the total composition of 3 and 5% by weight, respectively.
- The sodium silicate was added as a concentrated stock solution containing 34% by weight of active SiO₂:Na₂O in a ratio of 3.4:1.
- The solution was applied neat to stainless steel discs and left for sufficient time for visible corrosion to be apparent. The corrosion apparent was rated on an arbitrary scale of 1-10 where 1 refers to no corrosion and 10 refers to severe attack.
- The following compositions were prepared using the same stock solutions as in Examples 1-5,A-C, but additionally containing potassium tripolyphosphate. The latter was added as a concentrated stock solution containing 50% by weight of potassium tripolyphosphate. Clear solutions were obtained without any signs of precipitates being formed. The corrosion ratings were similar to those of Examples 1-3,A or 4,5,B,C depending on the amount of NaCl impurity of the sodium hypochlorite solution used.
(% by weight) Ex D 6 7 8 H₂O 59.7 55.7 51.7 47.7 KOH (50%) 6 6 6 6 KTPP (50%) 3 3 3 3 Na-silicate (34%) 0 4 8 12 NaOCl (19.2%) 31.3 31.3 31.3 31.3 pH 13.65 13.60 13.55 13.50
Claims (6)
- A liquid sanitizer composition comprising at least 2% by weight of a caustic agent, from 0 to 1% of a surfactant and at least 3% by weight of a hypohalite bleach and an amount of an alkali metal neutral silicate such that the weight ratio of silicate ions to free halogen is from 1:5 to 1:1.5 and the weight ratio of the hypohalite bleach to other water-soluble electrolyte in the composition is at most 1:1.
- A composition according to Claim 1, wherein the weight ratio of hypohalite bleach or other water-soluble electrolyte in the composition is from 1:2 to 1:1.
- A composition according Claim 1 or Claim 2, wherein the hypohalite bleach is an alkali metal hypochlorite.
- A composition according to any preceding Claim, further comprising from 1 to 5% of an alkali metal condensed phosphate builder.
- A composition according to any preceding Claim, wherein the pH is at least 12.0.
- A process of mechanical warewashing comprising dosing an effective sanitizing amount of a composition according to any preceding Claim into the wash liquor in a warewashing machine.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB878723675A GB8723675D0 (en) | 1987-10-08 | 1987-10-08 | Sanitizer |
GB8723675 | 1987-10-08 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0311175A2 EP0311175A2 (en) | 1989-04-12 |
EP0311175A3 EP0311175A3 (en) | 1990-04-11 |
EP0311175B1 true EP0311175B1 (en) | 1994-01-05 |
Family
ID=10625009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88202094A Expired - Lifetime EP0311175B1 (en) | 1987-10-08 | 1988-09-27 | Sanitizer |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0311175B1 (en) |
JP (1) | JPH01128907A (en) |
AU (1) | AU607813B2 (en) |
BR (1) | BR8805157A (en) |
DE (1) | DE3886873T2 (en) |
ES (1) | ES2061634T3 (en) |
GB (1) | GB8723675D0 (en) |
NO (1) | NO173023C (en) |
ZA (1) | ZA887548B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5843190A (en) * | 1993-11-11 | 1998-12-01 | The Procter & Gamble Company | Hypochlorite bleaching compositions |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3802127C1 (en) * | 1988-01-26 | 1988-12-01 | Kaiser, H.-G. | |
JPH0214298A (en) * | 1988-06-30 | 1990-01-18 | Matsushita Electric Ind Co Ltd | Detergent for vessel of cleaner and method for cleaning thereof |
GB9213578D0 (en) * | 1992-06-26 | 1992-08-12 | Unilever Plc | Improvements to bleaching compositions |
EP0892042A1 (en) * | 1993-11-11 | 1999-01-20 | The Procter & Gamble Company | The use of silicates in hypochlorite bleaching compositions |
US6297209B1 (en) | 1996-05-10 | 2001-10-02 | The Clorox Company | Sequesterants as hypochlorite bleach enhancers |
GB0222501D0 (en) | 2002-09-27 | 2002-11-06 | Unilever Plc | Composition and method for bleaching a substrate |
DE102005062008B3 (en) | 2005-12-22 | 2007-08-30 | Henkel Kgaa | Odor reduction of hypochlorite-containing agents |
DE102005063065A1 (en) * | 2005-12-29 | 2007-07-12 | Henkel Kgaa | Corrosion inhibition of liquid hypochlorite detergent |
DE102005063177A1 (en) | 2005-12-30 | 2007-07-05 | Henkel Kgaa | Use of diethylene-penta-methylene phosphonic acid for the stabilization of optical brightener in aqueous liquid detergent containing alkali hypochlorite |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB490092A (en) * | 1936-10-10 | 1938-08-09 | Ig Farbenindustrie Ag | Process for the production of cleansing agents |
GB1320919A (en) * | 1969-11-07 | 1973-06-20 | Albright & Wilson | Detergent composition |
JPS4926688B1 (en) * | 1970-12-09 | 1974-07-11 | ||
US3697431A (en) * | 1971-01-22 | 1972-10-10 | Clorox Co | Liquid drain opening composition and method |
US4339235A (en) * | 1979-12-06 | 1982-07-13 | Economics Laboratory, Inc. | Methods and compositions for bleaching of mycological stain |
JPS5690898A (en) * | 1979-12-25 | 1981-07-23 | Nippon Rasukatsuto Kk | Cleaning agent for household bath tub |
JPS58196297A (en) * | 1982-05-12 | 1983-11-15 | ア−ス製薬株式会社 | Bath boiler detergent |
US4752409A (en) * | 1985-06-14 | 1988-06-21 | Colgate-Palmolive Company | Thixotropic clay aqueous suspensions |
-
1987
- 1987-10-08 GB GB878723675A patent/GB8723675D0/en active Pending
-
1988
- 1988-09-27 DE DE3886873T patent/DE3886873T2/en not_active Expired - Fee Related
- 1988-09-27 EP EP88202094A patent/EP0311175B1/en not_active Expired - Lifetime
- 1988-09-27 ES ES88202094T patent/ES2061634T3/en not_active Expired - Lifetime
- 1988-10-05 AU AU23454/88A patent/AU607813B2/en not_active Ceased
- 1988-10-06 NO NO884451A patent/NO173023C/en unknown
- 1988-10-06 BR BR8805157A patent/BR8805157A/en not_active IP Right Cessation
- 1988-10-07 JP JP63253623A patent/JPH01128907A/en active Pending
- 1988-10-07 ZA ZA887548A patent/ZA887548B/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5843190A (en) * | 1993-11-11 | 1998-12-01 | The Procter & Gamble Company | Hypochlorite bleaching compositions |
Also Published As
Publication number | Publication date |
---|---|
EP0311175A3 (en) | 1990-04-11 |
AU2345488A (en) | 1989-04-13 |
NO884451D0 (en) | 1988-10-06 |
EP0311175A2 (en) | 1989-04-12 |
ZA887548B (en) | 1990-06-27 |
BR8805157A (en) | 1989-05-16 |
NO884451L (en) | 1989-04-10 |
AU607813B2 (en) | 1991-03-14 |
DE3886873T2 (en) | 1994-05-19 |
NO173023B (en) | 1993-07-05 |
ES2061634T3 (en) | 1994-12-16 |
DE3886873D1 (en) | 1994-02-17 |
NO173023C (en) | 1993-10-13 |
JPH01128907A (en) | 1989-05-22 |
GB8723675D0 (en) | 1987-11-11 |
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