Solid cleaning and disinfecting composition

Abstract

The present invention relates to a solid cleaning and disinfecting composition for cleaning surfaces, in particular for cleaning submerged surfaces such as flush toilets. The composition comprises a solid peroxide for use as an effective disinfectant and a combination of two surfactants, which ensures sufficient cleaning, high dissolution rates in water and the formation of large amounts of creamy and stable foams. The solid composition may be formulated in unit dose form that effervesces when dissolved in water to produce such foam.

Description

Field of the Invention

[0001] The present invention relates to a solid cleaning composition for cleaning surfaces, particularly for cleaning submerged surfaces such as toilet bowls. Background of the Invention

[0003] There is a need to provide consumers with cleaning compositions that can clean and disinfect household surfaces, such as surfaces in kitchens and bathrooms. In particular, there is a need for cleaning compositions that are effective on surfaces immersed in water, such as toilet bowls, kitchen sinks, washing machines and dishwashers.

[0004] Cleaning compositions known in the art for cleaning toilets are effective in maintaining sanitary surfaces by using antimicrobial agents, but such cleaning compositions generally tend to have low cleaning efficacy on submerged surfaces. The present inventors have invented a solution to this problem, which is disclosed as WO2021 / 180936. This involves the use of a unit dose cleaning composition comprising a cationic surfactant and a combination of selected substituted phenols, aliphatic terpene alcohols and unsaturated terpenes in an effervescent system.

[0005] When such a composition is used for an immersed object like a toilet bowl, it is generated to ensure that the cleaning and disinfecting active substance contacts the vertical surface of the toilet bowl for providing the desired benefits. The higher foam height that is stable over a long period of time ensures better cleaning and disinfection. Although the composition disclosed in the above-mentioned patent disclosure is effective in removing stains and scale, it is still necessary to provide excellent foaming to ensure enhanced cleaning and disinfection. When the composition is delivered in a unit dose solid form, it is also desirable that the solid composition dissolves quickly in water. The inventors found in the process of developing this composition that these desired benefits can be provided by a composition comprising a solid peroxide such as peroxydone, calcium peroxide or urea peroxide and two types of surfactant combinations. Solid peroxide compositions for cleaning applications have been reported in the past, for example in US2008 / 0045593. Although the use of solid peroxides and some surfactants is disclosed, it is found that they are not suitable for surfaces such as toilet bowls that are immersed.

[0006] It is an object of the present invention to provide a composition that provides cleaning and disinfecting benefits to immersed surfaces.

[0007] Another object of the present invention is to provide a composition that dissolves rapidly in water.

[0008] Still another object of the present invention is to provide such compositions with abundant stable and creamy foam. SUMMARY OF THE INVENTION

[0010] A first aspect of the present invention provides a solid cleaning and disinfecting composition comprising:

[0011] (a) solid peroxides;

[0012] (b) one or more primary surfactants selected from the group consisting of alkyl sulfate surfactants, alkylbenzene sulfonate surfactants, alkyl ether sulfate surfactants and soaps; preferably alkyl sulfate surfactants; and

[0013] (c) one or more secondary surfactants selected from fatty acyl isethionates, sodium lauroyl taurate, sodium lauroyl cocoate and cocamidopropyl betaine; preferably fatty acyl isethionates.

[0014] Another aspect of the present invention provides a method of cleaning a surface, preferably a toilet bowl, comprising the step of contacting a composition of the present invention with water on said surface. DETAILED DESCRIPTION OF THE INVENTION

[0016] For the avoidance of doubt, any feature of one aspect of the present invention may be used for any other aspect of the present invention. The word "comprising" is intended to mean "including", but not necessarily "consisting of" or "consisting of". Therefore, the term "comprising" is not meant to be limited to any subsequently stated elements, but optionally also includes unspecified elements with primary or secondary functional significance. In other words, the steps or options listed do not have to be exhaustive. Whenever the words "comprising" or "having" are used, these terms mean to be equivalent to "comprising" defined above. It should be noted that the examples given in the following description are intended to illustrate the present invention, rather than to limit the present invention to these examples themselves. Except in the embodiments, or where otherwise clearly indicated, all numbers representing the amount of material or reaction conditions, the physical properties of the material and / or the use in this specification should be understood to be modified by the word "about". Unless otherwise stated, the numerical range expressed in the format of "x to y" should be understood to include x and y. When multiple preferred ranges are described in the format of "x to y" for a particular feature, it should be understood that all ranges combining different endpoints are also considered. Unless otherwise indicated, amounts used herein are expressed as weight percent based on the total weight of the composition and are abbreviated as "wt %".

[0017] The composition comprises a solid peroxide. Preferred solid peroxides are selected from one or more of peroxyketone, calcium peroxide and urea peroxide, preferably peroxyketone. They have the structure given below:

[0018]

[0019] Carbamide Peroxide

[0020]

[0021] Peroxyketone, which is a PVP polymer complex

[0022] CaO2·xH2O

[0023] Calcium Peroxide

[0024] Urea peroxide and ketone peroxide release hydrogen peroxide when in contact with water. Calcium peroxide releases hydrogen peroxide when in contact with acidic water. Among solid peroxides, ketone peroxide is preferably used in the composition of the present invention.

[0025] Urea peroxide is available from Alfa Aesar (Thermo Fisher Scientific) as urea hydrogen peroxide adduct, calcium peroxide is available from Sigma Aldrich, and peroxydone is available from Ashland as Peroxydone TM Available in the form of XL-10.

[0026] The composition preferably comprises 0.1 to 10 wt %, preferably 0.5 to 5 wt %, even more preferably 1 to 4 wt % of solid peroxide.

[0027] The composition of the present invention comprises one or more primary surfactants selected from alkyl sulfate surfactants, alkyl benzene sulfonate surfactants, alkyl ether sulfate surfactants and soaps.

[0028] The preferred primary surfactant is an alkyl sulfate surfactant. The alkyl sulfate surfactant for inclusion in the composition of the present invention preferably has 10 to 18 carbon atoms, more preferably 10 to 12 carbon atoms. The surfactant has a counterion that is an alkali metal, such as sodium or potassium; or an ammonia counterion, such as monoethanolamine (MEA), diethanolamine (DEA) or triethanolamine (TEA). Preferably it is sodium or potassium, most preferably sodium.

[0029] Other major surfactants can be alkylbenzene sulfonate (LAS). The chemical structure of LAS is

[0030]

[0031] Yet another primary surfactant may be an alkyl ether sulfate surfactant. The alkyl ether sulfate surfactant for inclusion in the composition of the present invention preferably has 10 to 18 carbon atoms, more preferably C10 to C12 carbon atoms. The alkyl ether sulfate surfactant preferably has 1 to 10 ethylene oxide or propylene oxide units per molecule, preferably 1 to 3 ethylene oxide units per molecule. The surfactant has a counter ion that is an alkali metal, such as sodium or potassium; or an ammonia counter ion, such as monoethanolamine (MEA), diethanolamine (DEA) or triethanolamine (TEA). Preferably it is sodium or potassium, most preferably sodium. The most preferred surfactant of this type for inclusion in the composition is sodium laureth sulfate 1EO.

[0032] Yet another primary surfactant may be soap. The soap is preferably a C8-C24 soap, more preferably a C10-C20 soap, most preferably a C12-C18 soap. The soap may or may not have one or more carbon-carbon double or triple bonds. The cation of the soap may be an alkali metal, an alkaline earth metal or ammonium. Preferably, the cation of the soap is selected from sodium, potassium or ammonium. More preferably, the cation of the soap is sodium or potassium.

[0033] Soap can be obtained by saponifying fats and / or fatty acids. Fats or oils commonly used in soap making may be, for example, tallow, tallow stearin, palm oil, palm stearin, soybean oil, fish oil, castor oil, rice bran oil, sunflower oil, coconut oil, babassu oil, palm kernel oil, etc.

[0034] The composition preferably comprises from 0.1 to 5 wt%, more preferably from 0.5 to 4 wt% of the primary surfactant.

[0035] The compositions of the present invention comprise one or more secondary surfactants selected from fatty acyl isethionates, sodium lauroyl taurate, sodium lauroyl cocoate and cocamidopropyl betaine; preferably fatty acyl isethionates. Fatty acyl isethionate (e.g., cocoyl isethionate) surfactant "products" are defined as mixtures of anionic acyl isethionate surfactants and fatty acids / fatty acid soaps. They are highly desirable in personal care skin or hair cleansing products, particularly in personal care products, because they lather well, are mild to the skin and have good emollient properties. Typically, fatty acid isethionate surfactant products are produced by esterification of fatty acids or by reaction of fatty acid chlorides having a carbon chain length of C8-C20 with isethionic acid. Typical surfactant products containing fatty acyl isethionates contain about 40 to 95 wt % of acidic isethionates and 5 to 50 wt %, typically 10 to 40 wt %, of free fatty acids, in addition to usually less than 5 wt % of isethionates, and trace amounts (less than 2 wt %) of other additives. The composition preferably contains 0.1 to 5 wt %, more preferably 0.5 to 4 wt % of a secondary surfactant.

[0036] The composition preferably comprises an acidic component. The acidic component is preferably selected from organic acids, such as carboxylic acids, organic acid salts, organic anhydrides, inorganic acids, inorganic acid salts and mixtures thereof. Preferably, the organic acid and related salts and anhydrides are selected from carboxylic acids having up to 8 carbon atoms. Preferably, the acidic component is an organic acid, anhydride, sodium dihydrogen phosphate, disodium dihydrogen pyrophosphate, acid citrate, sodium sulfite and mixtures thereof, preferably wherein the acid source is an organic acid selected from citric acid, malic acid, tartaric acid, fumaric acid, sulfamic acid, oxalic acid, maleic acid, gluconic acid, succinic acid, salicylic acid, adipic acid and mixtures thereof, more preferably wherein the acid is one or both of citric acid and sulfamic acid.

[0037] The composition is preferably delivered in unit dosage form. The composition is further preferably delivered as an effervescent system having an acidic component and a basic component.

[0038] The alkaline component is preferably selected from carbonates, bicarbonates, sequicarbonates and mixtures thereof. More preferably, the carbonate component is preferably an alkali metal carbonate, preferably sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, sodium glycine carbonate and mixtures thereof.

[0039] The acidic component is preferably present in the effervescent system in an amount ranging from 20 to 80 wt %, more preferably 20 to 60 wt %, and even more preferably 20 to 40 wt %. The acidic and alkaline components are included in an amount to achieve rapid and complete dissolution of the unit dose. Therefore, the molar ratio of the acidic component to the alkaline component should be approximately in the range of about 1.0:2.0 to about 1.0:4.0.

[0040] Preferably, the combination of the acidic and basic components should account for 50% by weight of the unit dose. More preferably, the acidic and basic components account for at least 75% by weight of the unit dose, and most preferably, they account for at least 80% by weight of the unit dose.

[0041] The composition of the present invention is preferably in unit dosage form. Preferably, the unit dosage is a concentrate, capsule, tablet, lozenge or block. Preferably, the unit dosage is a tablet, lozenge or block.

[0042] The composition of the present invention preferably has a pH value in the range of 2 to 7, preferably 2.5 to 4.5. The pH value of the composition of the present invention is measured using the following procedure. 25 grams of tablets are dissolved in 1.5 liters of distilled water. The pH value of the solution is then measured at 25°C using a pH meter.

[0043] Another aspect relates to a method for cleaning a surface, preferably a toilet bowl, comprising the step of contacting a composition of the invention with water on said surface. Yet another aspect relates to the use of a composition of the invention for cleaning a surface, preferably an immersed surface such as a toilet bowl.

[0044] The invention will now be illustrated by the following non-limiting examples. Example

[0045] Examples A, 1, 2: Compositions according to the invention compared to compositions outside the invention for various desired benefits Impact:

[0046] The composition shown in Table-1 was prepared into tablets.

[0047] Table 1

[0048]

[0049] The compositions were tested for the following parameters:

[0050] (1) Dissolution time: Fill a beaker with water to about 60% of its height. Place the tablet in the beaker. Start a stopwatch to record the time. Record the time when the tablet is completely dissolved until the effervescence completely stops. This is recorded as the dissolution time.

[0051] (2) Foam height: Once the tablet is completely disintegrated in water according to the above procedure for measuring dissolution time, the height of the foam is measured and recorded as the foam height.

[0052] (3) Qualitative attributes of each composition were observed, such as effervescence speed (labeled as fast, medium, and slow), foam quality (creamy, light creamy, and light), and foam stability (high, medium, and low).

[0053] The data are summarized in Table 2:

[0054] Table 2:

[0055] performance Example-A Example-1 Example-2 Dissolution time, minutes Less than 1 minute About 5 minutes Less than 1 minute Foam height 25 mm 45 mm 35 mm Effervescence speed quick middle quick Foam quality light Light creamy Creamy Foam stability high middle high

[0056] The data in the above table show that the compositions according to the present invention (Examples 1 and 2) are acceptable in terms of dissolution time, effervescence rate and foam stability, while the foam height and foam quality of these compositions are better than the conventional composition (Example-A).

[0057] The compositions in Table-1 were used to test the antimicrobial efficacy using the following procedure:

[0058] The suspension test in this example is based on the general test scheme of EN1276.

[0059] The bacterial culture used had a concentration of 10 8 Bacterial counts of bacteria.

[0060] In this test, 8 ml of the formulation was used with 1 ml of bacterial culture and 1 ml of BSA solution. The concentration of the BSA solution was 0.03% to simulate "clean" surface conditions.

[0061] Therefore, after mixing 1 ml of culture with 8 ml of preparation and 1 ml of BSA solution, the bacterial count was diluted 10-fold, resulting in 10 per ml at the beginning of the experiment. 7 Bacterial counts of bacteria.

[0062] The formulations and bacteria were contacted for an appropriate period of time (60 minutes, as indicated in the examples below) and then neutralized (to quench the efficacy of the active substance and stop its action against the bacteria). The log reduction of bacteria by the formulations was calculated in the following examples relative to a water control and is noted in the corresponding tables. The evaluation of antimicrobial efficacy was performed as is or after dilution as indicated in the data set. These examples were performed at room temperature of 23°C.

[0063] Table 3 below summarizes the efficacy against various microorganisms:

[0064] Table 3:

[0065]

[0066] In the table above, the microorganisms used are:

[0067] EC: Escherichia coli ATCC 10536

[0068] EH: Enterococcus hirae ATCC 10541

[0069] PA: Pseudomonas aeruginosa ATCC 15442

[0070] SA: Escherichia coli ATCC 10536

[0071] The data in Table-3 above show that there is no detriment to the hygiene benefits using the compositions according to the present invention (Examples 1 and 2) as compared to the composition comprising SLS (Example-A) which is known to be a good surfactant for antimicrobial activity.

[0072] Example B, 3: Compared with the use of the solid peroxide (peroxyketone) according to the present invention, the use of conventional solid peroxide The effect of sodium percarbonate.

[0073] The composition shown in Table-4 was prepared into tablets.

[0074] Table 4

[0075] Element Example-B, wt % Example-3, weight % Sodium Lauryl Sulfate 1.5 1.5 Sodium Cocoyl Isethionate 1.5 1.5 Ketone peroxide - 1.0 Sodium Percarbonate 1.0 Sulfamic acid 62.5 62.5 Sodium carbonate 33.3 33.3 Sodium sulfate 0.2 0.2

[0076] The dissolution and foaming properties of the compositions were tested using the same procedure as in Table 1, such as dissolution time, foam height, effervescence rate, foam quality and foam stability:

[0077] The data are summarized in Table-5 below:

[0078] Table 5:

[0079] performance Example-B Example-3 Dissolution time, minutes 6 5 Foam height, mm 45 45 Effervescence speed slow middle Foam quality light Light creamy Foam stability middle middle

[0080] The data in the above Table-5 show that the composition according to the present invention (Example-5) provides faster dissolution and better effervescence rate compared to the composition outside the present invention (Example-B), thereby demonstrating the superiority of peroxide over sodium percarbonate.

[0081] Example C, 4: Differences between sodium percarbonate and peroxide in different surfactant systems.

[0082] The composition shown in Table-6 was prepared into tablets.

[0083] Table 6

[0084] Element Example-C, wt % Example-4, weight % Sodium Lauryl Sulfate 1.5 1.5 Cocamidopropyl Betaine 1.5 1.5 Ketone peroxide - 1.0 Sodium Percarbonate 1.0 Sulfamic acid 62.5 62.5 Sodium carbonate 33.3 33.3 Sodium sulfate 0.2 0.2

[0085] The dissolution and foaming properties of the compositions were tested using the same procedure as in Table 1, such as dissolution time, foam height, effervescence rate, foam quality and foam stability:

[0086] The data are summarized in Table-7 below:

[0087] Table 7:

[0088] performance Example-C Example-4 Dissolution time, minutes 1.5 0.75 Foam height, mm 30 35 Effervescence speed quick quick Foam quality Thick creamy Thick creamy Foam stability high high

[0089] The data in Table 7 above show that the composition according to the present invention (Example 4) provides faster dissolution and better foam height compared to the composition outside the present invention (Example C), thereby demonstrating the superiority of peroxyketone over sodium percarbonate in another surfactant system.

Claims

1. A solid cleaning and disinfecting composition comprising: (a) solid peroxides; (b) one or more primary surfactants selected from the group consisting of alkyl sulfate surfactants, alkylbenzene sulfonate surfactants, alkyl ether sulfate surfactants and soaps; preferably alkyl sulfate surfactants; and (c) one or more secondary surfactants selected from fatty acyl isethionates, sodium lauroyl taurate, sodium lauroyl cocoate and cocamidopropyl betaine; preferably fatty acyl isethionates; The solid peroxide is selected from one or more of ketone peroxide, calcium peroxide and urea peroxide.

2. The composition of claim 1, wherein the solid peroxide is a peroxyketone.

3. The composition of claim 1 or 2, wherein the composition comprises 0.1 to 10 wt% of the solid peroxide.

4. A composition as claimed in any preceding claim comprising from 0.1 to 5% of a primary surfactant.

5. A composition as claimed in any preceding claim comprising from 0.1 to 5% of a secondary surfactant.

6. A composition as claimed in any one of the preceding claims, further comprising one or more acidic components selected from organic acids, acid anhydrides, sodium dihydrogen phosphate, disodium dihydrogen pyrophosphate, acid citrates and sodium bisulfite.

7. The composition of claim 6, wherein the one or more acidic components are selected from citric acid, malic acid, tartaric acid, fumaric acid, sulfamic acid, oxalic acid, maleic acid, gluconic acid, succinic acid, salicylic acid and adipic acid; preferably one or both of citric acid and sulfamic acid.

8. The composition of claim 6 or 7, wherein the composition comprises 20 to 80 wt% of the acidic component.

9. A composition as claimed in any one of the preceding claims 6 to 8, which additionally comprises an alkaline component, such that the composition is an effervescent system.

10. The composition of claim 9, wherein the alkaline component is a carbonate source selected from alkali metal carbonates, preferably one or more of sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate and sodium glycine carbonate.

11. A composition as claimed in any preceding claim having a pH value in the range of 2 to 7.

12. A method of cleaning a surface, preferably a toilet bowl, comprising the step of contacting a composition as claimed in any one of the preceding claims with water on said surface.

13. Use of a composition as claimed in any one of the preceding claims 1 to 11 for cleaning a surface, preferably an immersed surface such as a toilet bowl.

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