A liquid dishwash composition

Abstract

The present invention relates to a liquid composition for cleaning surfaces in the kitchen. It more particularly relates to a liquid dishwash composition that cleans surfaces in the kitchen including hard surfaces therein like floors, table tops, and utensils and soft surfaces of kitchen implements like mops and sponges. The composition delivers high foam during washing even in the presence of high amount of soil. This is achieved through a combination of a rhamnolipid surfactant and specific polymer in a surfactant containing liquid dishwash composition.

Description

[0001] P0001232 CPL

[0002] 1

[0003] A LIQUID DISHWASH COMPOSITION

[0004] Field of the Invention

[0005] The present invention relates to a liquid composition for cleaning surfaces in the kitchen. It more 5 particularly relates to a liquid dishwash composition that cleans surfaces in the kitchen including hard surfaces therein like floors, table tops, and utensils and soft surfaces of kitchen implements like mops and sponges. The composition delivers high foam during washing even in the presence of high amount of soil.

[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 deliver the benefit even in the presence of high amount of soil. Such benefit is 15 especially preferred in the kitchen and the utensils and cutlery used therein as these are used for consuming food.

[0008] Foam produced during use of such compositions is an important cue to the consumer that the composition delivers good cleaning. It has been observed that when the soil load is high the 20 amount of initial foam and the foam stability is low. The present inventors were working towards solving this problem of ensuring high foam consistently during the washing process even at high soiled conditions. After extensive experimentation in this area using conventionally safe ingredients, they hit upon a surprising finding that a combination of a rhamnolipid surfactant and specific polymer in a surfactant containing liquid dishwash composition is able to deliver the above 25 benefit.

[0009] It is thus an object of the present invention to provide for a liquid dishwash composition using a combination of ingredients that have a history of safe use in home care products to deliver high and consistent foam even at high soil conditions.

[0010] 30

[0011] Summary of the Invention

[0012] The first aspect of the present invention relates to a liquid dishwash composition comprising (a) 3 to 30 wt% of a surfactant system comprisingP0001232 CPL

[0013] (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;

[0014] (ii) an amphoteric surfactant selected from one or both of alkyl amidopropyl betaine 5 surfactant and amine oxide surfactant;

[0015] (iii) 0.1 to 5 wt% a secondary anionic surfactant which is a rhamnolipid surfactant;

[0016] and

[0017] (b) an anionic polymer selected from one of

[0018] (i) Formula I

[0019]

[0020] Where x has a value from 20 to 200;

[0021] y has a value from 0 to 200; and

[0022] R is CH2COOH or H; or

[0023] 15 (ii) Formula II

[0024]

[0025] Where x has a value from 20 to 60.

[0026] wherein the polymer of formula 1 has a molecular weight of less than 100,000 Da.

[0027] Another aspect of the present invention relates to a method of delivering high foam during 20 washing of dishes even in the presence of high amount of soil 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.

[0028] Detailed Description of the Invention

[0029] 25 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 notP0001232 CPL

[0030] 3

[0031] 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 nonspecified 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 5 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 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. 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%”.

[0032] 15

[0033] The compositions of the present invention are preferred for non-therapeutic use, and more particularly preferred for use in cleaning inanimate surfaces, preferably wherein the surface is a hard surface such as ones in the kitchen.

[0034] 20 The composition of the invention is especially useful in dishwashing applications and for cleaning other surfaces in the kitchen. It is especially useful for washing dishes by hand. The composition delivers high and stable foam when used for washing dishes and other surfaces in the kitchen, even under high soiling conditions. It delivers similar benefit when cleaning implements used in the kitchen like sponges, scrubs, and mops.

[0035] 25 The composition of the invention comprises a surfactant system comprising total amount of 3 to 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 30 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.P0001232 CPL

[0036] 4

[0037] The anionic surfactant is preferably an alkyl sulphate surfactant. The alkyl sulphate surfactant 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) 5 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 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.

[0038] 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, 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 15 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 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.

[0039] 20

[0040] 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.

[0041] 25 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 30 oxide. The more preferred amine oxide is lauramine oxide.

[0042] 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.P0001232 CPL

[0043] 5

[0044] It is preferred that the weight ratio of the primary anionic surfactant to the amphoteric surfactant is 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. The composition comprises a secondary anionic surfactant which is a rhamnolipid surfactant. Rhamnolipids are a class of glycolipid. They are constructed of rhamnose combined with beta5 hydroxy fatty acids. Rhamnose is a sugar. Fatty acids are ubiquitous in animals and plants.

[0045] Rhamnolipids are discussed in Applied Microbiology and Biotechnology (2010) 86:1323- 1336 by E. Deziel et al. Rhamnolipids are produced by Glycosurf, AGAE Technologies and Urumqi Unite Bio-Technology Co., Ltd. Rhamnolipids may be produced by strains of the bacteria Pseudomonas aeruginosa. Rhamnolipids may also be produced by a recombinant cell of Pseudomonas putida where the recombinant cell comprises increased activity of at least one of the enzymes a / P hydrolase, rhamnosyltransferase I or rhamnosyl-transferase II compared to the wild-type of the cell.

[0046] 15 There are two major groups of rhamnolipids; mono-rhamnolipids and di-rhamnolipids. Monorhamnolipids have a single rhamnose sugar ring. A typical mono-rhamnolipid produced by P. aeruginosa is L-rhamnosyl-p-hydroxydecanoyl-p-hydroxydecanoate (RhaCwCw). It may be referred to as Rha-Cw-Cw, with a formula of C26H48O9. Monorhamnolipids have a single rhamnose sugar ring.

[0047] 20

[0048] The IUPAC Name is 3-[3-[(2R,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2- yl]oxydecanoyloxy]decanoic acid.

[0049] Di-rhamnolipids have two rhamnose sugar rings. A typical di-rhamnolipid is L-rhamnosyl-L- 25 rhamnosyl-p-hydroxydecanoyl-p-hydroxydecanoate (Rha2CioC ). It may be referred to as Rha- Rha-C- -C-10, with a formula of C32H58O13.

[0050] The IUPAC name is 3-[3-[4,5-dihydroxy-6-methyl-3-(3,4, 5-tri hydroxy-6-methyloxan-2- yl)oxyoxan-2-yl]oxydecanoyloxy]decanoic acid.

[0051] In practice, a variety of other minor components with different alkyl chain length combinations, depending upon carbon source and bacterial strain, exist in combination with the above more common rhamnolipids. The ratio of mono-rhamnolipid and di-rhamnolipid may be controlled by the production method. Some bacteria only produce monorhamnolipid, see US5767090: Example 35 1, some enzymes can convert mono-rhamnolipid to di-rhamnolipid.P0001232 CPL

[0052] 6

[0053] In various publications mono-rhamnolipids have the notation Rha-, which may be abbreviated as Rh or RL2. Similarly, di-rhamnolipids have the notation Rha-Rha or Rh-Rh or RL1. For historical reasons "rhamnolipid 2" is a mono-rhamnolipid and "rhamnolipid 1 "is a di-rhamnolipid. This leads 5 to some ambiguity in the usage or "RL1 " and "RL2" in the literature.

[0054] Throughout this patent specification, we use the terms mono- and di-rhamnolipid in order to avoid this possible confusion. However, if abbreviations are used R1 is mono-rhamnolipid and R2 is di- rhamnolipid. For more information on the confusion of terminology in the prior art, see the introduction to US 4814272.

[0055] The following rhamnolipids have been detected as produced by the following bacteria: (C12: 1 , C14:1 indicates fatty acyl chains with double bonds).

[0056] 15 Rhamnolipids produced by P. aeruginosa (mono-rhamnolipids):

[0057] Rha-C8-C10, Rha-C10-C8, Rha-C10-C10, Rha-C10-C12, Rha-C10-C12:1, Rha-C12-C10, Rha- C12:1-C10

[0058] Rhamnolipids produced by P. aeruginosa (di-rhamnolipids):

[0059] 20 Rha-Rha-C8-C10, Rha-Rha-C8-C12:1, Rha-Rha-C10-C8, Rha-Rha-C10-C10, Rha-Rha-C10- C12:1, Rha-Rha-C-10-C-12, Rha-Rha-C-12-C-10, Rha-Rha-C-12:1-C-12, Rha-Rha-C10-C14:1

[0060] Rhamnolipids produced by P. aeruginosa (unidentified as either mono- or di-rhamnolipids): C8- C8, C8-C10, C10-C8, C8-C12:1, C12:1-C8, C10-C10, C12-C10, C12:1-C10 C12-C12, C12:1- 25 C12, C14-C10, C14:1-C10, C14-C14.

[0061] Rhamnolipids produced by P. chlororaphis (mono-rhamnolipids only):

[0062] Rha-C10-C8, Rha-C10-C10, Rha-C12-C10, Rha-C12:1-C10, Rha-C12-C12, Rha-C12:1- C12, Rha-C14-C10. Rha-C-14:1-C-10.

[0063] Rhamnolipids produced by Burkholdera pseudomallei (di-rhamnolipids only):

[0064] Rha-Rha-C14-C14.

[0065] Rhamnolipids produced by Burkholdera (Pseudomonas) plantarii (di-rhamnolipids only):

[0066] Rha-Rha-C14-C14.P0001232 CPL

[0067] 7

[0068] There are over 100 strains of P. aeruginosa on file at the American Type Culture Collection (ATCC). There are also a number of strains that are only available to manufacturers of commercial Rhamnolipids. Additionally, there are probably thousands of strains isolated by various research institutions around the world. Some work has gone into typing them into groups.

[0069] 5 Each strain has different characteristics including how much rhamnolipid is produced, which types of rhamnolipids are produced, what it metabolizes, and conditions in which it grows. Only a small percentage of the strains have been extensively studied.

[0070] Through evaluation and selection, strains of P. aeruginosa can be isolated to produce rhamnolipids at higher concentrations and more efficiently. Strains can also be selected to produce less byproduct and to metabolize different feedstock or pollutants. This production is greatly affected by the environment in which the bacterium is grown.

[0071] A typical di-rhamnolipid is L-rhamnosyl-L-rhamnosyl-p-hydroxydecanoyl-p-hydroxydecanoate 15 (Rha2CioC with a formula of C32H58O13).

[0072] In practice a variety of other minor components with different alkyl chain length combinations, depending upon carbon source and bacterial strain, exist in combination with the above more common rhamnolipids. The ratio of mono-rhamnolipid and di-rhamnolipid may be controlled by 20 the production method. Some bacteria only produce monorhamnolipid, see US6767090: Example 1, some enzymes can convert mono-rhamnolipid to di-rhamnolipid.

[0073] Preferably the rhamnolipid is selected from:

[0074] Rhamnolipids produced by P. aeruginosa (mono-rhamnolipids):

[0075] 25 Rha-C8-C10, Rha-C10-C8, Rha-C10-C10, Rha-C10-C12, Rha-C10-C12:1, Rha-C12-C10, Rha- C12:1-C10

[0076] Rhamnolipids produced by P. chlororaphis (mono-rhamnolipids only):

[0077] Rha-C10-C8, Rha-C10-C10, Rha-C12-C10, Rha-C12:1-C10, Rha-C12-C12, Rha-C12:1- C12, 30 Rha-C14-C10, Rha-C14:1-C10.

[0078] Mono-rhamnolipids may also be produced from P.putida by introduction of genes rhIA and rhIB from Psuedomonas aeruginosa [Cha et al. in Bioresour Technol. 2008. 99(7):2192-9]

[0079] Rhamnolipids produced by P. aeruginosa (di-rhamnolipids):P0001232 CPL

[0080] Rha-Rha-C8-C10, Rha-Rha-C8-C12:1, Rha-Rha-C10-C8, Rha-Rha-C10-C10, Rha-RhaC10- C12:1, Rha-Rha-C10-C12, Rha-Rha-C12-C10, Rha-Rha-C12:1-C12, Rha-Rha-C10- C14:1 Rhamnolipids produced by Burkholdera pseudomallei (di-rhamnolipids only):

[0081] Rha-Rha-C14-C14.

[0082] 5 Rhamnolipids produced by Burkholdera (Pseudomonas) plantarii (di-rhamnolipids only):

[0083] Rha-Rha-C14-C14.

[0084] Rhamnolipids produced by P. aeruginosa which are initially unidentified as either mono- or di-rhamnolipids:

[0085] C8-C8, C8-C10, C10-C8, C8-C12:1, C12:1-C8, C10-C10, C12-C10, C12:1-C10, C12-C12, C12:1-C12, C14-C10, C14:1-C10, C14-C14.

[0086] Preferably the Rhamnolipid is L-rhamnosyl-(3-hydroxydecanoyl-p-hydroxydecanoate (RhaCwCw with a formula of C26H48O9).

[0087] Preferably, the rhamnolipid comprises at least 50 wt.% di-rhamnolipid, more preferably at least 15 60 wt.% di-rhamnolipid, even more preferably 70 wt.% di-rhamnolipid, most preferably at least 80 wt.% di-rhamnolipid.

[0088] Preferably the rhamnolipid is a di-rhamnolipid of formula: Rha2C8-i2Cs-i2. The preferred alkyl chain length is from Cs to C12. The alkyl chain may be saturated or unsaturated. The most 20 preferred di-rhamnolipid is an example of a di-rhamnolipid of formula: Rha2C8-i2Cs-i2, known as Rhamnolipid R2 herein, and can be supplied from Evonik. The composition comprises rhamnolipid in 0.1 to 5%, preferably 0.25 to 4.5% and most preferably 0.3 to 3%, by weight of the composition.

[0089] 25 The composition of the invention comprises an anionic polymer which belongs to one of the following two classes of polymers. By an anionic polymer is meant that the polymer has an anioninc charge when dispersed in water.

[0090] Formula I

[0091] 30

[0092]

[0093] Where x has a value from 20 to 200;P0001232 CPL

[0094] 9

[0095] y has a value from 0 to 200; and

[0096] R is CH2COOH or H;

[0097] An especially preferred polymer of this class is poly acrylic acid where R is H and y has a value 5 of 0.

[0098] Another preferred polymer of this class is poly acrylic acid co maleic acid where R is H and y has a value from 10 to 200.

[0099] Yet another preferred polymer of this class is poly itaconic acid where R is CH2COOH and y has a value of 0.

[0100] Commercially available polymers of the above class are available as Acusol 402, Acusol 445, and Acusol 479 (from Dow chemicals), and Polyitaconate (from Itaconix).

[0101] 15

[0102] The polymer of formula 1 has a molecular weight less than 100,000 Da. They are known as dispersant polymers. Such dispersant polymers are highly soluble in water. They usually provide a transparent solution when dissolved in water. The dispersant polymers for use in the present invention give a tubidity of less than 20 NTU preferably less than 10 NTU when dissolved in water 20 at 1 wt% at 25 °C. They are distinct from thickening polymers of the HASE (hydrophobically modified alkali swellable emulsion) class which are not fully soluble in water. The thickening polymers usually have a molecular weight higher than 100,000 Da. Commercially available thickening polymers (which are not suitable for use in the present invention) are Acusol 820 (from Dow chemicals) and Carbopol 980 (from Lubrizol).

[0103] 25

[0104] Formula II

[0105]

[0106] Where x has a value from 20 to 60.P0001232 CPL

[0107] 10

[0108] A preferred polymer of this class for inclusion in the composition of the invention is sodium polyaspartate where x has a value from 20 to 60.

[0109] Commercially available polymers of the above class are available as Baypure DS 100 (from (from LanXess).

[0110] 5 Especially suitable polymer from all of the above class of polymers for use in the present invention is selected from polyacrylic acid, polyaspartic acid, or polyitaconate. The composition preferably comprises 0.1 to 5%, more preferably 0.5 to 2% anionic polymer by weight of the composition.

[0111] 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 to 5. 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.

[0112] It is preferred that the composition of the invention additionally comprises a non-ionic water- 15 soluble polymer composed of poly ethylene oxide groups. Preferred polymers are those having solution with 1 ,000-6,000 cPs viscosity when added to water at 2%.

[0113] 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 20 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, 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 25 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.

[0114] In most hard surface cleaning application, the diluted solution is applied on to the desired surface by using a brush or a mop and allowing it to dry. A preferred method of applying the composition 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 35 surface, may be wiped off to a substantially dry condition using a dry cloth or wipe.P0001232 CPL

[0115] 11

[0116] Another aspect of the present invention relates to a method of delivering high foam during washing of dishes even in the presence of high amount of soil comprising the step of contacting the composition of the invention preferably diluted with water on to the desired surface followed 5 by the step of rinsing said surface with water.

[0117] The invention will now be illustrated with the help of the following non-limiting examples.

[0118] Examples

[0119] Examples A, 1-3: Effect of inclusion of claimed polymers on foam height and soil tolerance Compositions as shown in table -1 below were prepared.

[0120] The initial foam height and soil tolerance was measured for each of the samples using the procedure below and measured values are given in Table -1.

[0121] 15

[0122] Soil preparation:

[0123] Soil comprising fat and flour was prepared with the following ingredients: fatty acid (0.44%), vegetable oil (8.26%), white flour (8.7%) balance water.

[0124] The process of preparing the soil comprised taking the ingredients in a glass beaker and heating 20 to 70 °C to melt followed by blending the ingredients evenly. The mixture is blended and filtered using 1 mm sieve to a smooth consistency. The soil mixture is cooled to room temperature (25 °C).

[0125] Foam Height by Cylinder shake method:

[0126] 25 5% dilute solution of the test composition was prepared using 24FH hard water. 50ml of diluted formulation is taken in a foam measuring cylinder and shaken 10 times. After shaking, total volume and liquor volume is measured. Subtracting liquor volume from the total volume yielded the total foam value.

[0127] 30

[0128] Soil tolerance test:

[0129] For soil tolerance test, above-mentioned initial foam protocol was followed in the beginning. To the above initial foam generated 0.5g of soil mixture was added and the cylinder was shaken 10 times followed by determining the foam volume. 0.5g of soil mixture was added again and theP0001232 CPL

[0130] 12

[0131] process was repeated until the foam volume reduces to <10ml. The amount of soil added to reach foam volume <10ml considered as soil tolerance of the formulation.

[0132] Table -1

[0133]

[0134] SLES 1 EO in the table above refers to sodium lauryl ether sulphate with average of 1 EO group.

[0135] The data in the table above indicates that inclusion of polymers as per the invention (Examples 1-3) is able to deliver acceptable foam height and superior soil tolerance as compared to the 10 control (Example A).

[0136] Example D, 4: Effect of the inclusion of polymers as per the invention on foam height and soil tolerance at lower AD (total detergent content)

[0137] Experiments similar to the ones above except that a lower AD formulation as shown in Table-2 15 below were taken and the same measurements were made. The data is summarized in Table - 2 below.

[0138] Table - 2

[0139]

[0140] P0001232 CPL

[0141] 13

[0142]

[0143] The data in the table above indicates that inclusion of polymer as per the invention (Examples 4) is able to deliver both superior foam height and superior soil tolerance as compared to the control (Example B) at total lower AD.

[0144] 5

[0145] Example E-F, 5-6: Turbidity of a solution of the polymer as per the invention compared to that outside the invention

[0146] Polymer as per the invention (Acusol 402) of the dispersant type was compared to a thickening (HASE polymer) Acusol LA in terms of the tubidity as measured using an Oakton Turbidity 10 meter T-1000 instrument.

[0147] The data is summarized in Table - 3 below

[0148] Table - 3

[0149]

[0150] The data in Table -3 above indicates that polymer for use in the present invention (a dispersant 15 polymer, Examples 5 and 6) are very different from that of thickening (HASE type, Examples E and F) polymer in that the polymer for use in the present invention delivers highly transparent solution when dissolved in water .

Claims

P0001232 CPL14Claims1. A liquid dishwash 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) 0.1 to 5 wt% a secondary anionic surfactant which is a rhamnolipid surfactant;and(b) an anionic polymer selected from one of(i) Formula IWhere x has a value from 20 to 200;y has a value from 0 to 200; andR is CH2COOH or H; or(ii) Formula IIWhere x has a value from 20 to 60;wherein the polymer of formula 1 has a molecular weight of less than 100,000 Da.

2. A composition as claimed in claim 1 comprising 2 to 20 wt% primary anionic surfactant.P0001232 CPL153. A composition as claimed in claim 1 wherein the primary anionic surfactant is an alkyl ether sulphate surfactant.

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

5. A composition as claimed in any one of the preceding claims wherein the amphoteric surfactant is cocoamidopropyl betaine.

6. A composition as claimed in any one of the preceding claims wherein the polymer is selected from polyacrylic acid, polyaspartic acid, or polyitaconate.

7. A composition as claimed in any one of the preceding claims comprising 0.1 to 5 wt%, preferably 0.5 to 2 wt% anionic polymer.

8. A composition as claimed in any one of the preceding claims comprising 70 to 90% water.

9. A composition as claimed in any one of the preceding claims having a pH in the range of 3 to 6.

10. A composition as claimed in any one of the preceding claims wherein the weight ratio of the primary anionic surfactant to the secondary amphoteric surfactant is between 1.5:1 to 20:1.

11. A method of delivering high foam during washing of dishes even in the presence of high amount of soil 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.

Images