A liquid cleaning composition

Abstract

The present invention relates to a liquid cleaning composition. It more particularly relates to a liquid dishwashing composition that delivers antimalodour benefit. This is achieved through a combination of an amino acid surfactant and certain chelating agent in a conventional cleaning composition that comprises certain select primary anionic surfactant and an amphoteric surfactant.

Description

[0001] P0000781 CPL

[0002] 1

[0003] A LIQUID CLEANING COMPOSITION

[0004] Field of the Invention

[0005] The present invention relates to a liquid cleaning composition. It more particularly relates to a 5 liquid dishwashing composition that delivers antimalodour benefit.

[0006] Background of the Invention

[0007] Most people prefer to live in areas where the floors, table tops, kitchen surfaces, utensils, bathrooms and toilets are clean and have a pleasant feel. Such surfaces are generally cleaned using compositions that contain surfactants. People prefer that the surfaces cleaned with such compositions continue to be clean and have a pleasant odour long after the cleaning is done. Such benefit is especially preferred in the kitchen and the utensils and cutlery used therein as these are used for consuming food.

[0008] 15 The present inventors noticed that compositions known in the art are good in delivering desired cleaning but often do not deliver much malodour benefit. After extensive experimentation in this area using conventionally safe ingredients, they hit upon a surprising finding that a combination of an amino acid surfactant and certain chelating agent in a conventional cleaning composition that comprises certain select primary anionic surfactant and an amphoteric surfactant delivers 20 excellent antimalodour efficacy when washing surfaces in the kitchen including utensils, dishes and cutlery.

[0009] It is thus an object of the present invention to provide for an antimalodour composition using a combination of ingredients that have a history of safe use in home care products.

[0010] 25

[0011] Summary of the Invention

[0012] A liquid dishwashing composition comprising

[0013] (a) 3 to 30 wt% of a surfactant system comprising

[0014] (i) a primary anionic surfactant selected from one or more of an alkyl ether sulphate surfactant, an alkyl sulphate surfactant and an alkyl benzene sulphonate surfactant.

[0015] (ii) an amphoteric surfactant selected from one or both of alkyl amidopropyl betaine surfactant and amine oxide surfactant;

[0016] (iii) a secondary anionic surfactant which is an amino acid based surfactant having a pKa value 35 in the range of 1 to 5;P0000781 CPL

[0017] 2

[0018] (b) 0.0001 to 2 wt% of a chelating agent selected from one or more of trisodium methyl glycine diacetate (MGDA), L-glutamic acid N, N-diacetic acid tetrasodium (GLDA), sodium gluconate, capryl hydroxamic acid (CHA), elthylenediamine- N, N’-disuccinicacid (EDDS); Iminodisuccinic acid (IDS), polyaspartic acid, gluconolactone and piroctone olamine; and 5 (c) 70 to 90 wt% water;

[0019] wherein the composition has a pH in the range of 2 to 6.

[0020] Another aspect of the present invention relates to a method of reducing malodour from surfaces in the kitchen comprising the step of contacting the composition of the first aspect preferably diluted with water on to a desired surface followed by the step of rinsing said surface with water.

[0021] Detailed Description of the Invention

[0022] For the avoidance of doubt, any feature of one aspect of the present invention may be utilised in any other aspect of the invention. The word "comprising" is intended to mean "including" but not necessarily "consisting of” or "composed of". Thus, the term "comprising" is meant not to be limiting to any subsequently stated elements, but rather to optionally also encompass non15 specified elements of major or minor functional importance. In other words, the listed steps or options need not be exhaustive. Whenever the words "including" or "having" are used, these terms are meant to be equivalent to "comprising" as defined above. It is noted that the examples given in the description below are intended to clarify the invention and are not intended to limit the invention to those examples per se. Except in the examples, or where otherwise explicitly 20 indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and / or use are to be understood as modified by the word "about". Unless specified otherwise, numerical ranges expressed in the format "x to y" are understood to include x and y. When for a specific feature multiple preferred ranges are described in the format "x to y", it is understood that all ranges combining the different endpoints are also contemplated.

[0023] 25 Unless specified otherwise, amounts as used herein are expressed in percentage by weight based on total weight of the composition and is abbreviated as “wt%”.

[0024] The compositions of the present invention are preferred for non-therapeutic use, and more particularly preferred for use in cleaning surfaces, preferably wherein the surface is a hard surface 30 such as ones in the kitchen.

[0025] The composition of the invention is especially useful for use in dishwashing applications and for cleaning other surfaces in the kitchen. It is especially useful for washing dishes by hand. The composition ensures good malodour efficacy to the dishes and other surfaces cleaned in theP0000781 CPL

[0026] 3

[0027] kitchen. It also ensures that cleaning implements used in the kitchen like sponges, scrubs, and mops are kept fresh and free of malodour for a long time.

[0028] The composition of the invention comprises a surfactant system comprising total amount of 3 to 5 30%, preferably 3 to 20%, more preferably 3 to 15%, further more preferably 3 to 12%, even further more preferably 4 to 10% surfactants, by total weight of the composition. Three types of surfactants are present in the surfactant system. It includes a primary surfactant which is an anionic surfactant. The primary anionic surfactant is selected from one or more of an alkyl ether sulphate surfactant, an alkyl sulphate surfactant and an alkyl benzene sulphonate surfactant. The primary anionic surfactant is preferably included in 2 to 20%, more preferably 2 to 9 %, further more preferably 2 to 7%, even further more preferably 2 to 6% of the total weight of the composition.

[0029] The anionic surfactant is preferably an alkyl sulphate surfactant. The alkyl sulphate surfactant 15 for inclusion in the composition of the invention preferably has 10 to 18 carbon atoms, more preferably 10 to 12 carbon atoms. The surfactant has a counterion which is an alkali metal such as sodium or potassium; or an ammoniacal counterion such as monoethanolamine, (MEA) diethanolamine (DEA) or triethanolamine (TEA). Preferably it is sodium or potassium, most preferably it is sodium. The most preferred surfactant of this class for inclusion in the composition 20 of the invention is sodium lauryl sulphate. The alkyl sulphate surfactant is preferably included in 0.1 to 5%, preferably 0.2 to 4% by weight of the composition.

[0030] The anionic surfactant is preferably an alkyl ether sulphate surfactant. The alkyl ether sulphate surfactant for inclusion in the composition of the invention preferably has 10 to 18 carbon atoms, 25 more preferably 10 to 12 carbon atoms. The alkyl ether sulphate surfactant preferably has one to ten ethylene oxide or propylene oxide units per molecule, preferably one to three ethylene oxide units per molecule. The surfactant has a counterion which is an alkali metal such as sodium or potassium; or an ammoniacal counterion such as monoethanolamine, (MEA) diethanolamine (DEA) or triethanolamine (TEA). Preferably it is sodium or potassium, most preferably it is 30 sodium. The most preferred surfactant of this class for inclusion in the composition is sodium laureth sulphate 1EO. The alkyl ether sulphate surfactant is preferably included in 0.1 to 5%, more preferably 0.2 to 4% by weight of the composition.P0000781 CPL

[0031] 4

[0032] Another class of anionic surfactant that may preferably be included is of the alkylbenzene sulfonates type, particularly linear alkylbenzene sulfonates (LAS) with an alkyl chain length of from 10 to 18 carbon atoms.

[0033] 5 The composition as per the invention comprises an amphoteric surfactant. The amphoteric surfactant is selected from one or both of alkyl amidopropyl betaine surfactant and amine oxide surfactant. Preferred alkyl amidopropyl betaine is cocoamido propyl betaine. The amine oxide may be any one of the C8 - C18 alkyl amine n-oxide (which is broadly referred to an amine oxide). The preferred amine oxide is one or both of lauramine oxide or lauryl / myristyl amido propyl amine oxide. The more preferred amine oxide is lauramine oxide.

[0034] Preferably, the composition preferably comprises 1 to 20%, more preferably 1 to 10 %, further more preferably 1 to 5 %, even further more preferably 1 to 3% amphoteric surfactant, by total weight of the composition.

[0035] It is preferred that the weight ratio of the primary anionic surfactant to the amphoteric surfactant is 15 between 1.5:1 to 20:1, more preferably between 1.5: 1 to 5: 1, further more preferably 1.5:1 to 3:1.

[0036] The composition comprises a secondary anionic surfactant which is an amino acid based surfactant having a pKa value in the range of 1 to 5, preferably in the range of 3 to 5. The amino acid surfactant is preferably selected from one or more of C10 - C18 alkyl sarcosinate, glutamate, glycinate, taurate and alaninate. They are preferably selected from one or more of disodium 20 cocoyl glutamate, sodium lauroyl glutamate, sodium myristoyl glutamate, potassium myristoyl glutamate, potassium cocoyl glutamate, disodium oleoyl glutamate, sodium cocoyl glycinate, potassium cocoyl glycinate, sodium lauroyl glycinate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate, sodium oleoyl sarcosinate, sodium myristyl sarcosinate, sodium cocoyl alaninate, sodium lauroyl alaninate, sodium methyl cocoyl taurate and sodium methyl lauroyl taurate. 25 Of these, a sarconsinate, a glutamate or a glycinate surfactant is preferred.

[0037] The amino acid surfactant is preferably included in 0.01 to 3 wt%, more preferably 0.01 to 2 wt%, further more preferably 0.02 to 1 wt% of the composition.

[0038] The composition of the invention comprises a chelating agent. The chelating agents preferred for use in the present invention are those that are considered biodegradable. It is preferably 30 selected from one or more of trisodium methyl glycine diacetate (MGDA), L-glutamic acid N, N- diacetic acid tetrasodium (GLDA), sodium gluconate, capryl hydroxamic acid (CHA), elthylenediamine - N, N’-disuccinic acid (EDDS); Iminodisuccinic acid (IDS), polyaspartic acid, gluconolactone and piroctone olamine. The preferred chelating agent is one or more of MGDA,P0000781 CPL

[0039] 5

[0040] GLDA, CHA and sodium gluconate. The composition comprises 0.0001 to 2.0 wt%, preferably 0.001 to 1.5 wt%, and more preferably 0.01 to 1.5 wt% chelating agent by weight of the composition.

[0041] The composition preferably includes an organic acid. Preferred organic acid for use in the present 5 invention are one or more of lactic, glycolic, tartaric, and citric acid. The most preferred acid is citric acid. The organic acid may also be present in the salt form. Alkali metal or alkaline earth metal salts are preferred, more preferably alkali metal salts of which sodium salt is most preferred. The composition preferably comprises 0.1 to 5 wt%, more preferably 0.1 to 3 wt%, further more preferably 0.1 to 2 wt% of organic acid or salt thereof.

[0042] The composition is effective at a pH in the range of 2 to 6 preferably in the range of 4 to 6, further more preferably in the range of 4.5 to 6. The formulation is homogenized and the pH of the formulation is directly measured using a pre-calibrated pH meter at a temperature of 25 °C. The composition is generally in liquid form. It contains high amount of water. Water is generally present in 70 to 90 wt%, preferably 75 to 88 wt % of the composition.

[0043] 15 It is particularly preferred that the composition is free of an alkane diol.

[0044] It is preferred that the composition of the invention comprises a non-ionic water-soluble polymer composed of poly ethylene oxide groups. Such polymers are also known by as poly ethylene glycol polymers. Preferred polymers are those having solution with 1,000-6,000 cPs viscosity when added to water at 2%.

[0045] 20 The composition of the invention is preferably used for home care applications with special usefulness in cleaning hard and soft surfaces in the kitchen. Preferably, the composition used in the present invention is used to clean a hard surface in many household or industrial environments, and may include kitchen floors, walls, and windows. Such surfaces may be made from many different materials, including for instance plastics, wood, metal, ceramics, glass, 25 concrete, marble, and painted surfaces. The composition may be applied to the surface by any suitable means known to the skilled person. For instance, a suitable means may be pouring, dropping, spraying or wiping in case of liquid compositions. It may also be used for hand dishwash applications to clean utensils, cutlery, and crockery. The invention also ensures minimal malodour formation on soft surfaces like those on cleaning implements like sponges, mops and scrubs. In such cases the composition may be used in diluted form with water. The dilution with water in such cases is preferably in the range of 1:1 to 1:100 and more preferably in a ratio of between 1 : 1 to 1 : 10.

[0046] In most hard surface cleaning application, the diluted solution is applied on to the desired surface 35 by using a brush or a mop and allowing it to dry. A preferred method of applying the compositionP0000781 CPL

[0047] 6

[0048] to the surface is through spraying using a spray pump. This is especially useful when applying on to vertical surfaces. In certain cases, the compositions after it is applied on to the desired surface, may be wiped off to a substantially dry condition using a dry cloth or wipe.

[0049] 5 Another aspect of the present invention relates to a method of providing anti-malodour benefit to a surface comprising the step of cleaning the surface with a composition of the invention preferably diluted with water. This step may then be followed by the step of rinsing the surface with water.

[0050] Yet another aspect of the present invention relates to use of the composition of the invention for delivering anti-malodour benefit to a surface cleaned with the composition.

[0051] The invention will now be illustrated with the help of the following non-limiting examples.

[0052] 15 Examples

[0053] Examples A-C, 1 : Effect of the combination of actives as per the invention on maldour reduction Compositions as shown in Table -1 were prepared. They were tested for efficiency in reducing malodour as per the procedure given below. The average malodour score is summarized in 20 Table - 1.

[0054] Kitchen sponge of size 7.5 x 10 x 3.5 cm were cut into 24 pieces and the individual piece were were placed inside GC vials. To the sponges 20 pl of 0.01% dimethyl disulfide (DMDS) in propylene glycol were added and the sponges were squeezed for the equal distribution of DMDS. To this 1.04 g of diluted formulation (1 part formulation : 1.5 part distilled water) was added and 25 the sponges were squeezed for equal distribution of formulation. Two sets of samples were made.

[0055] One set was used for sniffing by 5 volunteers and second set was used for malodor evaluation using GCMS.

[0056] Table - 1

[0057]

[0058] P0000781 CPL

[0059] 7

[0060]

[0061] SLES 1 EO in the above table refers to sodium lauryl ether sulphate with one ethoxylate group PAS refers to primary alkyl sulphate.

[0062] Polyox WSR N60K is a water soluble non-ionic polymer having poly ethylene oxide group 5 available from IFF

[0063] The data in the table -1 above indicates that the composition as per the invention (Example -1) delivers improved malodour reduction as compared to compositions outside the invention comprising subset combinations (Example A to C) as measured using two different methods. Further, it is observed that use of pH of 5.5 (in the range of 2 to 6 as per the invention) delivers 10 better malodour control compared to use of higher pH of about 7.5

Claims

P0000781 CPL8Claims1. A liquid dishwashing composition comprising(a) 3 to 30 wt% of a surfactant system comprising(i) a primary anionic surfactant selected from one or more of an alkyl ether sulphate surfactant, an alkyl sulphate surfactant and an alkyl benzene sulphonate surfactant.(ii) an amphoteric surfactant selected from one or both of alkyl amidopropyl betaine surfactant and amine oxide surfactant;(iii) a secondary anionic surfactant which is an amino acid based surfactant having a pKa value in the range of 1 to 5;(b) 0.0001 to 2 wt% of a chelating agent selected from one or more of trisodium methyl glycine diacetate (MGDA), L-glutamic acid N, N-diacetic acid tetrasodium (GLDA), sodium gluconate, capryl hydroxamic acid (CHA), elthylenediamine - N, N’- disuccinic acid (EDDS); Iminodisuccinic acid (IDS), polyaspartic acid, gluconolactone and piroctone olamine; and(c) 70 to 90 wt% water;wherein the composition has a pH in the range of 2 to 6.

2. A composition as claimed in claim 1 wherein the primary anionic surfactant is alkyl ether sulphate preferably having 10 to 18 carbon atoms and 1 to 10 ethylene oxide groups.

3. A composition as claimed in claim 1 or 2 comprising 2 to 20 wt% primary anionic surfactant.

4. A composition as claimed in any one of the preceding claims wherein the amphoteric surfactant is alkyl amido propyl betaine preferably coco amido propyl betaine (CAPB).

5. A composition as claimed in any one of the preceding claims comprising 1 to 20 wt% amphoteric surfactant.

6. A composition as claimed in any one of the preceding claims wherein the amino acid surfactant is selected from one or more of C10 - C18 alkyl sarcosinate, glutamate, glycinate, taurate and alaninate.P0000781 CPL97. A composition as claimed in claim 6 wherein the amino acid surfactant is selected from one or more of disodium cocoyl glutamate, sodium lauroyl glutamate, sodium myristoyl glutamate, potassium myristoyl glutamate, potassium cocoyl glutamate, disodium oleoyl glutamate, sodium cocoyl glycinate, potassium cocoyl glycinate, sodium lauroyl glycinate, sodium lauroyl sarcosinate, sodium cocoyl sarcosinate, sodium oleoyl sarcosinate, sodium myristyl sarcosinate, sodium cocoyl alaninate, sodium lauroyl alaninate, sodium methyl cocoyl taurate and sodium methyl lauroyl taurate.

8. A composition as claimed in any one of the preceding claims comprising 0.01 to 3 wt% amino acid based surfactant.

9. A composition as claimed in any one of the preceding claims wherein the chelating agent is selected from one or more of MGDA, GLDA, CHA and sodium gluconate.

10. A composition as claimed in any one of the preceding claims comprising an organic acid.

11. A composition as claimed in claim 10 wherein the organic acid is selected from one or more of lactic acid, glycolic acid, tartaric acid and citric acid; preferably citric acid.

12. A composition as claimed in claim 10 or 11 wherein the organic acid is included in 0.1 to 5% by weight of the composition.

13. A composition as claimed in any one of the preceding claims substantially free of an alkane diol.

14. A composition as claimed in any one of the preceding claims additionally comprising a non-ionic water-soluble polymer composed of poly ethylene oxide groups.

15. A method of reducing malodour from surfaces in the kitchen comprising the step of contacting a composition as claimed in any on the preceding claims preferably diluted with water on to a desired surface followed by the step of rinsing said surface with water.

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