POST-FOAMING MILD CLEANSING COMPOSITION

Abstract

The present invention relates to personal cleansing compositions in post-foaming gel or cream form, which are particularly mild, can contain high levels of emollient skin-care ingredients and produce copious amounts of creamy foam in use. The structure of the compositions enables stable post-foaming gels or creams to be made combining unusually low surfactant levels with high levels of emollient oils. The present invention provides an effective solution to the dual consumer need for highly skin caring cleansing formulations with excellent foaming characteristics.

Claims

1.-25. (canceled)

26. A post-foaming composition comprising: a) water; b) one or more anionic surfactants in an amount of about 2 to about 20% by weight of the composition; c) one or more amine oxide surfactants in an amount of about 1 to about 10% by weight of the composition; d) a hydrophobically modified alkali-swellable acrylic emulsion (HASE) polymer in an amount of about 0.5 to about 3% polymer solids by weight of the composition; e) a substantially water-insoluble oil from in an amount of about 1% to about 50% by weight of the total composition; and f) a foaming agent comprising a non-polar saturated aliphatic hydrocarbon having from 3 to 6 carbon atoms.

27. A composition according to claim 26, wherein the HASE polymer is provided in the form of an aqueous liquid emulsion.

28. A composition according to claim 26, wherein the HASE polymer comprises one or more selected from an acrylates/steareth-20 methacrylate copolymer, an acrylates/beheneth-25 methacrylate copolymer, an acrylates/steareth-20 methacrylate crosspolymer, an acrylates/palmeth-25 acrylate copolymer, and an acrylates/beheneth-25 methacrylate copolymer.

29. A composition according to claim 26, wherein the HASE polymer is present in an amount of about 1 to about 2% by weight of the composition.

30. A composition according to claim 26, wherein the one or more anionic surfactants comprise one or more selected from alkyl sulfates; ethoxylated alkyl sulfates; alpha olefin sulfonates; alkyl alkoxy carboxylates; acyl isethionates; acyl sarcosinates; sulfosuccinates; or acyl glutamates; wherein the one or more anionic surfactants optionally comprise one or more selected from sodium lauryl sulfate, sodium cocosulfate, sodium laureth sulfate, sodium trideceth sulfate, sodium cocoyl isethionate, sodium cocoyl sarcosinate, disodium laureth sulfosuccinate, or sodium cocoyl glutamate.

31. A composition according to claim 30, wherein the one or more anionic surfactants comprise sodium laureth sulfate.

32. A composition according to claim 26, wherein the one or more anionic surfactants are present in an amount of about 1 to about 10% by weight of the composition.

33. A composition according to claim 26, wherein the one or more amine oxide surfactants comprise alkamine oxides and alkylamidopropyl amine oxides containing at least one hydrocarbon chain containing at least eight carbon atoms.

34. A composition according to claim 33, wherein the one or more amine oxide surfactants comprise one or more selected from alkyl dimethyl amine oxides of the formula: ##STR00005## or alkyl di(hydroxy lower alkyl)amine oxides of the formula: ##STR00006## or alkamidopropyl dimethyl amine oxides of the formula: ##STR00007## wherein the alkyl groups are straight or branched chain, saturated or unsaturated and contain from 8 to about 22 carbon atoms.

35. A composition according to claim 34, wherein the alkyl di(lower alkyl) amine oxides comprise one or more selected from lauryl dimethyl amine oxide, myristyl dimethyl amine oxide, dimethyl cocoamine oxide, myristyl/palmityl dimethyl amine oxide, myristyl/lauryl dimethyl amine oxide, cetyl dimethyl amine oxide, stearyl dimethyl amine oxide, and myristyl/cetyl dimethyl amine oxide; the alkyl di(hydroxy lower alkyl)amine oxides comprise one or more selected from bis(2-hydroxyethyl)cocoamine oxide, and bis(2-hydroxyethyl)stearylamine oxide; and the alkamidopropyl di(lower alkyl)amine oxides comprise cocoamidopropyl dimethyl amine oxide

36. A composition according to claim 26, wherein the one or more amine oxide surfactants comprise decyl dimethylamine oxide, lauryl dimethylamine oxide, stearyl dimethylamine oxide, oleyl dimethylamine oxide, coco dihydroxyethylamine oxide, cetyl N,N-dihydroxyethylamine oxide, oleyl N,N-dihydroxyethylamine oxide, cocamine oxide, cocamidopropylamine oxide, lauramidopropylamine oxide, oleamine oxide, oleamidopropylamine oxide, wheat germamidopropylamine oxide, isostearamido-propylamine oxide, stearamine oxide, stearamido-propylamine oxide, decylamine oxide, dihydroxyethyl C8-C18 alkoxypropylamine oxide, dihydroxyethyl stearamine oxide, myristamidopropylamine oxide, myristamine oxide, palmitamidopropylamine oxide, palmitamine oxide, undecylenamidopropylamine oxide, and mixtures of any two or more thereof.

37. A composition according to claim 26, wherein the one or more amine oxide surfactants comprise lauramine oxide, myristamine oxide, cocamine oxide, lauramidopropyl amine oxide, myristamidopropyl amine oxide, cocamidopropyl amine oxide and mixtures of any two or more thereof;

38. A composition according to claim 26, wherein the one or more amine oxide surfactants are present in an amount of about 1 to about 5% by weight of the composition.

39. A composition according to claim 26, wherein the foaming agent comprises one or more compounds selected from iso-pentane, n-pentane, neo-pentane, iso-butane or n-butane; and wherein the foaming agent is optionally present in an amount of from about 2% to about 20% by weight of the composition.

40. A composition according to claim 26, wherein the oil is present in an amount of from about 2% to about 20% by weight of the composition.

41. A composition according to claim 26, wherein the pH of the invention is in the range of about 6.0 to about 8.0.

42. A composition according to claim 26, further comprising one or more ingredients selected from oils; natural or synthetic scrub particles; visual effect agents; humectants; cationic conditioning agents; preservatives, colorants, chelating agents, pH adjusters, or a clay-based rheology modifier; or further comprising one or more ingredients selected from emollients, moisturizers, conditioners, skin conditioners, hair conditioners, vitamins, pro-vitamins, antioxidants, free-radical scavengers, abrasives, dyes, hair coloring agents, bleaching agents, UV absorbers, anti-UV agents, antibacterial agents, antifungal agents, melanin regulators, tanning accelerators, depigmenting agents, skin lightening agents, skin-coloring agents, liporegulators, weight-reduction agents, anti-acne agents, antiseborrhoeic agents, anti-ageing agents, anti-wrinkle agents, keratolytic agents, anti-inflammatory agents, anti-acne agents, antibiotics, anti-inflammatory agents, botanical extracts, imidazoles, refreshing agents, cicatrizing agents, vascular-protection agents, agents for the reduction of dandruff, seborrheic dermatitis, or psoriasis, shale oil and derivatives thereof, anti-psoriasis agents, corticosteroids depilating agents, agents for combating hair loss, reducing agents for permanent-waving, reflectants, essential oils and fragrances.

43. A method of manufacturing a personal cleansing composition according to claim 26, the method comprising the steps of: i) loading an amount of water into a suitable vessel; ii) adding a HASE polymer, one or more anionic surfactants, one or more amine oxide surfactants and a substantially water-insoluble oil, sequentially in any order, with sufficient mechanical stirring to ensure that each material is fully dispersed before adding the next; iii) continuing mixing until a uniform consistency is achieved; and iv) adding a foaming agent comprising a non-polar saturated aliphatic hydrocarbon having from 3 to 6 carbon atoms.

44. A method of manufacturing a personal cleansing composition according to claim 43, the method comprising the steps of: i) dissolving one or more anionic surfactants in an amount of water; ii) adding a HASE polymer emulsion, mixing until the polymer is substantially dispersed in the one or more anionic surfactants; iii) adding a water-insoluble oil, mixing until the oil is substantially dispersed; iv) adding one or more amine oxide surfactants; and v) mixing until a uniform consistency is achieved; and vi) adding a foaming agent comprising a non-polar saturated aliphatic hydrocarbon having from 3 to 6 carbon atoms.

45. A method of delivering one or more ingredients selected from emollients, moisturizers, conditioners, skin conditioners, hair conditioners, vitamins, pro-vitamins, antioxidants, free-radical scavengers, abrasives, dyes, hair coloring agents, bleaching agents, UV absorbers, anti-UV agents, antibacterial agents, antifungal agents, melanin regulators, tanning accelerators, depigmenting agents, skin lightening agents, skin-coloring agents, liporegulators, weight-reduction agents, anti-acne agents, antiseborrhoeic agents, anti-ageing agents, anti-wrinkle agents, keratolytic agents, anti-inflammatory agents, anti-acne agents, antibiotics, anti-inflammatory agents, botanical extracts, imidazoles, refreshing agents, cicatrizing agents, vascular-protection agents, agents for the reduction of dandruff, seborrheic dermatitis, or psoriasis, shale oil and derivatives thereof, anti-psoriasis agents, corticosteroids depilating agents, agents for combating hair loss, reducing agents for permanent-waving, reflectants, essential oils and fragrances to skin or hair, the method comprising applying a composition according to claim 1 to a body of a person.

Description

DETAILED DESCRIPTION

[0042] The invention uses a combination of an anionic surfactant combined with an amine oxide surfactant, a substantially water-insoluble oil, and a HASE polymer. The resulting combination is then blended with a post-foaming agent and packaged into a bi-compartmental or other suitable aerosol system.

[0043] The combination of anionic surfactant and amine oxide surfactant provides a relatively mild and low cost cleansing mixture. It is milder than typical high anionic (either synthetic or soap based) systems and delivers acceptable performance at a cost that is typically less than equivalently performing systems based upon synthetic surfactants. A key driver of this benefit is that relatively low levels of surfactant are required to create a consumer acceptable product.

[0044] The inventors have found that resulting anionic-amine oxide surfactant mixture interacts strongly with the HASE polymer, enabling the use of lower polymer and surfactant inclusion levels than those which would normally be required to provide a sufficiently high viscosity at rest necessary for stabilisation of dispersed materials such as oil droplets.

[0045] The addition of the oil further improves the skin care qualities of the composition. The oil is emulsified into the base gel with simple mixing, stabilised by the HASE polymer due to hydrophobic interactions with the pendant groups. The presence of the oil can confer a high degree of opacity and a cream-like texture to the composition. Such attributes are highly desirable in meeting consumer expectations for a product designed to care for skin. Alternatively, if desired, transparent oil-containing gels may also be formulated using appropriate selection of surfactants and oils. It is commonly understood in the art that incorporation of oil into a cleansing composition is technically beneficial, as a proportion of said oils may deposit onto the skin during washing thus compensating for skin lipids that are removed by surfactants. Furthermore, while not wishing to be bound by any particular theory, it is believed that the presence of oils reduces the capacity of surfactants in the formulation to interact with skin lipids as their hydrophobic tails are already engaged with the oil droplets in the formulation.

[0046] When a suitable post-foaming agent is mixed into the composition it becomes uniformly incorporated with little or no change in appearance. This can be transferred into a suitable aerosol container (ideally bi-compartmental) under pressure. When dispensed from the container the product emerges with an appearance of a gel/cream, and when applied to wet skin or hair, the warmth and moderate shearing forces results in the post-foaming agent emerging as a gas which transforms the gel/cream into copious amounts of rich, creamy foam.

[0047] The present invention addresses the dual challenges of delivering excellent foaming performance with a high degree of mildness to skin by utilising post-foaming technology. The solution the inventors have developed inherently produces a significantly greater foam volume than conventional and commercially available products. The present invention therefore has the potential to compensate for an inherently poor foaming base system, which creates the opportunity to use high emollient levels, low surfactant levels and surfactant types that are mild but not particularly good at foaming when used in conventional (i.e. non post-foaming) products.

[0048] The problem in achieving this in a post-foaming format is that the known prior art in the field of post-foaming cleansing compositions would be unstable if pushed in this direction because formation of the gel structure, and its ongoing stability, requires a fine balance of particular surfactant levels and post-foaming agent(s), typically requiring a relatively high level of surfactants that is counter-productive for skin care as they tend to remove skin lipids. The present invention addresses this challenge by utilising a novel structuring system that is surprisingly robust, enables the use of low surfactant levels and tolerates high levels of emollient oils which in principle can deliver more lipids to the skin than the cleansing process removes.

[0049] The composition is packaged in to an aerosol container or any such container that can dispense a post-foaming gel. This may be a bi-compartmental aerosol container. A bi-compartmental aerosol container than can be used to contain the composition of the invention may take the form of a bag in can, bag on valve, piston, elasticated bladder or other barrier system. Application of an external pressure to the formulation-containing compartment enables the formulation to be dispensed on opening a valve, actuated by the consumer during product usage.

[0050] The pressure must be sufficient to prevent the post-foaming agent transforming to a gaseous state inside the formulation compartment, even at elevated temperature. This may be applied either by mechanical means (such as an elasticated bladder system) or via an external propellant that resides in the space between the formulation compartment and the outer container. In the case of the latter the external propellant gas may be either a liquefied or compressed gas, such as a C1-C4 hydrocarbon, a fluorocarbon, nitrous oxide, compressed air or nitrogen.

[0051] A further advantage of this novel approach is that it is can use very mild anionic surfactants such as sulfosuccinates, sarcosinates, glutamates etc as primary surfactants. Traditionally, they are used only as co-surfactants due to cost and performance limitations. The ability for this system to structure up effectively and produce a good level of foam at low active levels makes the use of these mild anionic surfactants a realistic proposition where the aim is to deliver a higher degree of mildness. The resulting formulations have a desirably thick but shear-thinning gel texture. It is flexible in its ability to allow the stable incorporation of oils up to at least 50%. It is also easy to manufacture, has good lathering characteristics and has been found to leave the skin feeling soft and smooth.

HASE Polymer Constituent:

[0052] HASE polymers or thickeners are well known in the art, and are the associative analogue to alkali-swellable emulsion ASE synthetic thickeners which are produced commercially by emulsion polymerisation. Like the ASE thickeners, HASE polymers have backbones made from methacrylic acid and various acrylate/methacrylate alkyl ester monomers. However, unlike typical ASE types, HASE polymers contain hydrophobic pendants which are commonly attached via polyethylene oxide chains. Thickening is achieved by 2 mechanisms: firstly, upon addition of an alkaline neutralising base (for example an alkali metal hydroxide), the COOH moieties along the backbone become ionised to COO carboxyl groups which cause the polymer chain to expand by electrostatic repulsion and become soluble in water, changing from a milky low viscosity dispersion to a transparent gel. Secondly, the hydrophobic pendant groups are able to build associations with each other and also with surfactants, oil droplets and any other dispersed particulates. This creates a network structure that is accompanied by significant viscosity build.

[0053] Suitable HASE polymers for use in the present invention are anionic in nature upon neutralisation. They are typically supplied in the form of an aqueous liquid emulsion (which has an un-neutralised, acidic pH) form with hydrophobic appendages which make them associativei.e. they can associate with other formulation ingredients, such as surfactants, oils or particles.

[0054] Suitable HASE polymers include, but are not limited to, those commercially available from Rohm & Haas under the Aculyn trade name, such as Aculyn 22 (acrylates/steareth-20 methacrylate copolymer), Aculyn 28 (acrylates/beheneth-25 methacrylate copolymer) and Aculyn 88 (acrylates/steareth-20 methacrylate crosspolymer). Other options include Synthalen W2000 from 3V (acrylates/palmeth-25 acrylate copolymer), and Novethix L-10 (acrylates/beheneth-25 methacrylate copolymer) from Lubrizol.

[0055] The HASE polymer is present in an amount of about 0.5 to about 3% by weight (as polymer solids) of the total composition, typically from about 0.5 to about 2% by weight, more typically from about 1.0 to about 1.5% by weight.

Anionic Surfactant Constituent:

[0056] Suitable anionic surfactants for use in the composition of the invention include, but are not limited to, alkyl sulfates (e.g. sodium lauryl sulfate or sodium cocosulfate); ethoxylated alkyl sulfates (e.g. sodium laureth sulfate or sodium trideceth sulfate); alpha olefin sulfonates; alkyl alkoxy carboxylates; acyl isethionates (e.g. sodium cocoyl isethionate); acyl sarcosinates (e.g. sodium cocoyl sarcosinate); sulfosuccinates (e.g. disodium laureth sulfosuccinate); or acyl glutamates such as sodium cocoyl glutamate. Alternative counter ions may be used in place of sodium, such as potassium, ammonium, triethanolammonium (TEA), or monoisopropylammonium (MIPA). According to one embodiment, the anionic surfactant includes, or is, sodium laureth sulfate.

[0057] The one or more anionic surfactants are present in an amount of about 0.5 to about 20% by weight of the composition; typically from about 1 to about 10% by weight, more typically from about 2 to about 6% by weight.

Amine Oxide Constituent:

[0058] Suitable amine oxide surfactants for use in the composition of the invention include, but are not limited to, alkamine oxides containing at least one long hydrocarbon chain containing at least eight carbon atoms.

[0059] One such class of amine oxides is the alkyl di(lower alkyl) amine oxides, wherein the alkyl group therein contains from 8 to 22, and preferably about 10 to about 16, carbon atoms, and can be straight or branched chain, saturated or unsaturated. The lower alkyl groups in the alkyl di(lower alkyl) amine oxides contain from 1 to 7 carbon atoms, and typically are methyl, ethyl, propyl or butyl, more typically methyl or ethyl. Specific examples include, but are not limited to, lauryl dimethyl amine oxide, myristyl dimethyl amine oxide, dimethyl cocoamine oxide, dimethyl (hydrogenated tallow)amine oxide, myristyl/palmityl dimethyl amine oxide, myristyl/lauryl dimethyl amine oxide, cetyl dimethyl amine oxide, stearyl dimethyl amine oxide, and myristyl/cetyl dimethyl amine oxide. These alkamine oxides have a general structural formula:

##STR00002##

[0060] Another class of useful amine oxides for use in the present invention includes alkyl di(hydroxy lower alkyl)amine oxides in which the alkyl group contains from 8 to 22, and preferably about 10 to about 16 carbon atoms, and can be straight or branched chain, saturated or unsaturated. The lower alkyl groups in the alkyl di(lower alkyl) amine oxides contain from 1 to 7 carbon atoms, and typically are methyl, ethyl, propyl or butyl, more typically methyl or ethyl. Specific examples, include, but are not limited to, bis(2-hydroxyethyl)cocoamine oxide, and bis(2-hydroxyethyl)stearylamine oxide. These alkamine oxides have a general structural formula:

##STR00003##

[0061] Additional useful amine oxides for use in the present invention are termed alkamidopropyl di(lower alkyl)amine oxides in which the alkyl group contains from 8 to 22, and preferably about 10 to about 16 carbon atoms, and can be straight or branched chain, saturated or unsaturated. The lower alkyl groups in the alkyl di(lower alkyl) amine oxides contain from 1 to 7 carbon atoms, and typically are methyl, ethyl or propyl, more typically methyl. Non-limiting examples thereof are cocoamidopropyl dimethyl amine oxide and lauramidopropyl dimethyl amine oxide. These alkamine oxides have a general structural formula:

##STR00004##

[0062] The above classes of alkamine oxide surfactants contain one or more C8-C22 alkyl groups selected from, for example, octyl, decyl, undecyl, lauryl, tridecyl, myristyl, cetyl, stearyl, isostearyl, oleyl, and mixtures thereof. Non-limiting examples of amine oxide surfactants include, but are not limited to, decyl dimethylamine oxide, lauryl dimethylamine oxide, stearyl dimethylamine oxide, oleyl dimethylamine oxide, coco dihydroxyethylamine oxide, cetyl N,N-dihydroxyethylamine oxide, oleyl N,N-dihydroxyethylamine oxide, cocamine oxide, cocamidopropylamine oxide, lauramidopropylamine oxide, oleamine oxide, oleamidopropylamine oxide, wheat germamidopropylamine oxide, isostearamido-propylamine oxide, stearamine oxide, stearamido-propylamine oxide, decylamine oxide, dihydroxyethyl C8-C18 alkoxypropylamine oxide, myristamidopropylamine oxide, myristamine oxide, palmitamidopropylamine oxide, palmitamine oxide, undecylenamidopropylamine oxide, and mixtures of any two or more thereof. Preferred alkamine oxide surfactants are the alkyl di(lower alkyl)amine oxides in which the alkyl group contains about 12 to about 16 carbon atoms, including lauramine oxide, myristamine oxide, cocamine oxide, cetamine oxide, and mixtures of any two or more thereof. According to one embodiment of the invention, the amine oxide surfactant comprises, or is, lauramine oxide.

[0063] The one or more amine oxide surfactants are present in an amount of about 1 to about 10% by weight of the composition; typically from about 0.5 to about 8.0% by weight, more typically from about 1.0 to about 5.0% by weight, more typically from about 1.5 to about 3.0% by weight.

Foaming Agent Constituent

[0064] Typically, the foaming agent comprises one or more compounds selected from iso-pentane, n-pentane, neo-pentane, iso-butane or n-butane. Typically, the foaming agent constitutes from about 2% to about 20%, and preferably between about 5% to about 15%, by weight of the composition.

[0065] By post-foaming in the context of the invention, it is meant that the composition contains a volatile foaming agent that transforms from a liquid or gelled state (by being dissolved, emulsified or otherwise entrapped in the formulation matrix) to a gaseous state after dispensation from its retail packaging, and during intended usage, to generate foam internally within the applied formulation, by virtue of this change of physical state of said agent. Unlike conventional cleansing products such formulations are therefore not reliant on entrainment of atmospheric air by mechanical action to generate foam.

Emollient Oil Constituent

[0066] Suitable oils are those that are substantially water-insoluble, by which it is meant herein that their solubility in water at 20 C. is less than 50% by weight of the water/oil mixture. Suitable oils include those of vegetable origin, plant derived butters, mineral oils (e.g. petroleum derived or otherwise extracted and refined from rock/mineral deposits found within the Earth's crust), animal derived (e.g. squalene), or synthetic such as silicones. Chemically the oils may be long-chain hydrocarbons, tri-acyl glycerides, man-made esters formed from reaction of carboxylic acids with alcohols, or silicones. As used herein, the definition of water-insoluble oils does not include C.sub.3-C.sub.6 aliphatic hydrocarbons which are used as the foaming agent.

[0067] Vegetable triglycerides, mineral oil, petrolatum, hydrocarbons (excluding C.sub.3-C.sub.6 aliphatic hydrocarbons, as indicated above), silicones, plant derived butters, esters, essential oils, or compounded fragrance oils may be used.

[0068] Oils that are of vegetable origin for use in the invention include sunflower oil, corn oil, rapeseed oil, ground nut oil, almond oil, jojoba oil, petrolatum, lanolin, coconut oil, palm oil, palm kernel oil and plant butters, etc.

[0069] The emollient oil constituent is present in an amount of about 1 to about 50% by weight of the composition; typically from about 1.5 to about 30% by weight, more typically from about 2 to about 20% by weight.

[0070] According to another embodiment of the invention, the composition may further contain one or more of the following components:

[0071] Natural or synthetic scrub particles (e.g. polyethylene, silica, rice bran, loofah, pumice, diatomaceous earth, pearlite, ground fruit or nut stones or shells), visual effect agents (e.g. wax particles, polymeric opacifiers, inorganic shimmers), humectants (e.g. glycerol, sorbitol, glycols, urea, amino acids, lactates), cationic conditioning agents (such as cationic guar or cassia gum derivatives, Polyquaternium-7, Polyquaternium-39, Polyquaternium-10, etc) preservatives, colourants, chelating agents and pH adjusters (acids or bases). The formulation may optionally include a clay based rheology modifier such as a bentonite, hectorite, montmorillonite or synthetic clay such as Laponite (Rockwood Products) which is available in various grades.

[0072] The various components of the composition of the invention are added in their respective amounts as desired; the balance of the composition to 100% is water.

[0073] The composition of the invention may further contain one or more ingredients selected from emollients, moisturizers, conditioners, skin conditioners, hair conditioners, vitamins, pro-vitamins, antioxidants, free-radical scavengers, abrasives, dyes, hair coloring agents, bleaching agents, UV absorbers, anti-UV agents, antibacterial agents, antifungal agents, melanin regulators, tanning accelerators, depigmenting agents, skin lightening agents, skin-coloring agents, liporegulators, weight-reduction agents, anti-acne agents, antiseborrhoeic agents, anti-ageing agents, anti-wrinkle agents, keratolytic agents, anti-inflammatory agents, anti-acne agents, antibiotics, anti-inflammatory agents, botanical extracts, imidazoles, refreshing agents, cicatrizing agents, vascular-protection agents, agents for the reduction of dandruff, seborrheic dermatitis, or psoriasis, shale oil and derivatives thereof, anti-psoriasis agents, corticosteroids depilating agents, agents for combating hair loss, reducing agents for permanent-waving, reflectants, essential oils and fragrances.

[0074] The pH of the composition of the invention is typically in the range of about 6.0 to about 10.0, and more typically in the range of about 6.0 to about 8.0.

[0075] Such post-foaming compositions are suitable for use as personal cleansing compositions, such as a body wash, facial wash or hand wash, for washing hair, or as shaving gels.

[0076] Also provided in accordance with the present invention is a method of manufacturing a personal cleansing composition comprising: [0077] a) water; [0078] b) one or more anionic surfactants in an amount of about 2 to about 20% by weight of the composition; [0079] c) one or more amine oxide surfactants in an amount of about 1 to about 10% by weight of the composition; [0080] d) a hydrophobically modified alkali-swellable acrylic emulsion (HASE) polymer in an amount of about 0.5 to about 3% polymer solids by weight of the composition; [0081] e) a substantially water-insoluble oil in an amount of about 1% to about 50% by weight of the composition; and [0082] f) a foaming agent comprising a non-polar saturated aliphatic hydrocarbon having from 3 to 6 carbon atoms;
the method comprising the steps of: [0083] i) loading an amount of water into a suitable vessel; [0084] ii) adding a HASE polymer, one or more anionic surfactants, one or more amine oxide surfactants and a substantially water-insoluble oil, sequentially in any order, with sufficient mechanical stirring to ensure that each material is fully dispersed before adding the next; [0085] iii) continuing mixing until a uniform consistency is achieved; and [0086] iv) adding a foaming agent comprising a non-polar saturated aliphatic hydrocarbon having from 3 to 6 carbon atoms.

[0087] Optionally, any of the surfactant or polymer constituents may be pre-mixed with water (with an equal amount of water being subtracted from the starting an amount of water added in step (i)) in any proportion before being added.

[0088] Optionally, one or more cationic conditioning agents may also be added into the water, before or after the addition of the HASE polymer and surfactants.

[0089] An exemplary, but non-limiting, method in accordance with the invention comprises the following steps: [0090] i) dissolving one or more anionic surfactants in an amount of water; [0091] ii) adding a HASE polymer emulsion, mixing until the polymer is substantially dispersed in the one or more anionic surfactants; [0092] iii) adding a water-insoluble oil, mixing until the oil is substantially dispersed; [0093] iv) adding one or more amine oxide surfactants; and [0094] v) mixing until substantially uniform consistency is achieved.

[0095] Optionally, one or more cationic conditioning agents may also be added into the water, before the addition of the one or more anionic surfactants to the amount of water. Also, further optional minor ingredients, such as chelating agents, preservatives, fragrances, humectants may be added, typically after the addition of the HASE polymer, and further materials to be suspended if required (e.g. beads, scrubs, etc.), may also be added, typically after the addition of the water-insoluble oil.

[0096] The foaming agent is added last, after all of the other components have been mixed.

[0097] The formulation remains unstructured and generally of low viscosity until the addition of amine oxide, at which point the structure develops as the surfactants and polymer interact with each other. The final ingredient (hydrocarbon foaming agent) is added with appropriate mixing to ensure the final mixture is homogeneous, and the composition is filled into a suitable container.

[0098] Also provided in accordance with the present invention is a use of a composition comprising: [0099] a) water; [0100] b) one or more anionic surfactants in an amount of about 2 to about 20% by weight of the composition; [0101] c) one or more amine oxide surfactants in an amount of about 1 to about 10% by weight of the composition; [0102] d) a hydrophobically modified alkali-swellable acrylic emulsion (HASE) polymer in an amount of about 0.5 to about 3% polymer solids by weight of the composition; [0103] e) a substantially water-insoluble oil in an amount of about 1% to about 50% by weight of the composition; and [0104] f) a foaming agent comprising a non-polar saturated aliphatic hydrocarbon having from 3 to 6 carbon atoms,
as a personal cleansing composition, such as a body wash, facial wash or hand wash, for washing hair, or as a shaving gel.

[0105] Also provided in accordance with the present invention is a use of a composition comprising: [0106] a) water; [0107] b) one or more anionic surfactants in an amount of about 2 to about 20% by weight of the composition; [0108] c) one or more amine oxide surfactants in an amount of about 1 to about 10% by weight of the composition; [0109] d) a hydrophobically modified alkali-swellable acrylic emulsion (HASE) polymer in an amount of about 0.5 to about 3% polymer solids by weight of the composition; [0110] e) a substantially water-insoluble oil in an amount of about 1% to about 50% by weight of the composition; and [0111] f) a foaming agent comprising a non-polar saturated aliphatic hydrocarbon having from 3 to 6 carbon atoms
as a vehicle for delivery of one or more ingredients selected from emollients, moisturizers, conditioners, skin conditioners, hair conditioners, vitamins, pro-vitamins, antioxidants, free-radical scavengers, abrasives, dyes, hair coloring agents, bleaching agents, UV absorbers, anti-UV agents, antibacterial agents, antifungal agents, melanin regulators, tanning accelerators, depigmenting agents, skin lightening agents, skin-coloring agents, liporegulators, weight-reduction agents, anti-acne agents, antiseborrhoeic agents, anti-ageing agents, anti-wrinkle agents, keratolytic agents, anti-inflammatory agents, anti-acne agents, antibiotics, anti-inflammatory agents, botanical extracts, imidazoles, refreshing agents, cicatrizing agents, vascular-protection agents, agents for the reduction of dandruff, seborrheic dermatitis, or psoriasis, shale oil and derivatives thereof, anti-psoriasis agents, corticosteroids depilating agents, agents for combating hair loss, reducing agents for permanent-waving, reflectants, essential oils and fragrances to skin or hair.

[0112] The present invention will be further described with reference to the following examples, which are intended to be illustrative only, and in no way limiting upon the scope of the invention.

EXAMPLES

[0113]

TABLE-US-00001 TABLE 1 Formulations Ingredients Note A B C D E F G Sodium Laureth Sulfate 1 7.20 7.20 7.20 6.30 Sodium Lauroyl 2 Sarcosinate Sodium Cocoyl Isethionate 3 6.75 Sodium Lauroyl Methyl 4 2.70 Isethionate Disodium Laureth 5 6.75 Sulfosuccinate Disodium Cocoyl 6 Glutamate Lauramine Oxide 7 1.80 Lauramine/Myristamine 8 1.80 1.80 2.25 2.70 2.25 Oxide Cocamine Oxide 9 1.80 Lauric/Myristic 10 Amidopropylamine Oxide Acrylates/Steareth-20 11 0.90 0.90 0.90 0.90 0.90 1.18 methacrylate crosspolymer Acrylates/Palmeth-25 12 acrylate crosspolymer Acrylates/Beheneth-25 13 0.90 methacrylate copolymer Sodium Lithium 14 0.18 0.36 0.36 0.36 Magnesium Silicate Polyquaternium-7 15 0.16 0.16 0.16 PEG-200 Hydrogenated 16 Glyceryl Palmate (and) PEG-7 Glyceryl Cocoate Tetrasodium Glutamate 17 0.09 0.09 0.09 0.09 0.09 0.09 0.09 Diacetate Glycerin 18 0.90 0.90 DMDM Hydantoin 19 0.18 0.18 0.18 0.18 0.18 0.18 0.18 Fragrance Oil 20 0.72 0.64 0.72 0.72 0.72 0.79 0.72 Sunflower Oil 21 5.00 3.00 2.00 Rapeseed Oil 21 10.00 Paraffinum Liquidum 22 3.00 Jojoba Oil 23 2.00 Isopropyl Palmitate 24 2.00 Isopentane 25 10.00 10.00 10.00 10.00 10.00 10.00 10.00

TABLE-US-00002 TABLE 2 Formulations Ingredients Note H I J K L M N Sodium Laureth Sulfate 1 5.00 2.70 2.70 7.20 Sodium Lauroyl 2 6.75 Sarcosinate Sodium Cocoyl Isethionate 3 Sodium Lauroyl Methyl 4 4.46 Isethionate Disodium Laureth 5 Sulfosuccinate Disodium Cocoyl 6 6.75 Glutamate Lauramine Oxide 7 1.80 Lauramine/Myristamine 8 2.25 2.25 1.66 1.49 1.80 Oxide Cocamine Oxide 9 Lauric/Myristic 10 1.80 Amidopropylamine Oxide Acrylates/Steareth-20 11 1.18 1.00 1.00 0.60 0.52 1.50 methacrylate crosspolymer Acrylates/Palmeth-25 12 1.18 acrylate crosspolymer Acrylates/Beheneth-25 13 methacrylate copolymer Sodium Lithium 14 0.36 0.36 0.18 Magnesium Silicate Polyquaternium-7 15 0.16 0.24 0.24 PEG-200 Hydrogenated 16 0.90 0.90 Glyceryl Palmate (and) PEG-7 Glyceryl Cocoate Tetrasodium Glutamate 17 0.09 0.09 0.10 0.09 0.09 0.09 0.09 Diacetate Glycerin 18 0.90 0.90 DMDM Hydantoin 19 0.18 0.18 0.18 0.18 0.18 0.18 0.18 Fragrance Oil 20 0.72 0.72 0.72 0.72 0.72 0.64 0.64 Sunflower Oil 21 25.00 50.00 8.00 Rapeseed Oil 21 5.00 10.00 5.00 5.00 Paraffinum Liquidum 22 Jojoba Oil 23 Isopropyl Palmitate 24 Isopentane 25 10.00 10.00 5.00 15.00 10.00 10.00 10.00 Notes 1 Steol CS 270 (Stepan Company) - supplied as 70% active paste 2 Surfacare L30 (Surfachem) - supplied as 30% active solution 3 Elfan AT84 (Akzo Nobel N.V.) - supplied as a powder 4 Iselux LQ-CLR-SB (Innospec) - supplied as a 35% active solution 5 Rewopol SB FA 30B (Evonik Industries A.G.) - supplied as 30% active solution 6 Plantapon ACG HC (BASF Personal Care) - supplied as 50% active solution 7 Mackamine LO E (Solvay Europe) - supplied as 30% active solution 8 Ammonyx LO (Stepan Company) - supplied as 30% active solution 9 Mackamine CS (Solvay Europe) - supplied as 30% active solution 10 Mackamine LMDO (Solvay Europe) - supplied as 30% active solution 11 Aculyn 88 (The Dow Chemical Company) - supplied as a 29% polymer solids dispersion 12 Synthalen W2000 (3V Sigma) - supplied as a 31% polymer solids dispersion 13 Novethix L-10 (The Lubrizol Corporation) - 30% polymer solids 14 Laponite XLS (BYK Additives) 15 Mackernium 007B (Solvay Europe) 16 Rewoderm LIS 80 (Evonik Industries A.G.) 17 Dissolvine GL38 (Akzo-Nobel N.V.) 18 Cremer Oleo 19 Microcare DH (Thor Personal Care) 20 Seven Scent 21 Food grade, acquired from retail store 22 Kemcare Ltd 23 IMCD N.V. 24 Tegosoft P (Evonik Industries A.G.) 25 Sigma Aldrich

[0114] In each of the formulations listed in Tables 1 and 2, the balance was made up with water. All figures refer to % w/w as active substance with the exception of Rewoderm LIS 80 for which the inclusion levels are quoted as supplied.

[0115] All of the formulations A-N listed above have a pH in the range of 6.0 to 8.0, are opaque white, and have the consistency of self-supporting creams upon dispensation from a pressurised container. The application of gentle shearing forces (such as by rubbing onto a person's skin) causes a transformation into a dense foam or lather.

[0116] All of the formulations A-N listed above are able to act as personal cleansing compositions which incorporate insoluble benefit agents, i.e. the various oils, in a stable manner, have long shelf lives, are cost effective, and are easy to manufacture. The formulations are also able to incorporate other insoluble benefit agents in a stable manner if required.

[0117] Furthermore, the inventors have also found that the resulting compositions have advantageous sensory qualities when used for personal washing, in particular producing a voluminous yet creamy lather and a pleasant skin-feel during the washing process which persists as a conditioned feel after washing. The presence of significant amounts of oils in these formulations provides a number of benefits, namely a desirably creamy texture, deposition of oils onto the skin (countering the undesirable removal of natural lipids from the skin as experienced with most washing products) and a mildness benefit arising from a reduced capacity of the surfactants to interact with skin lipids.

[0118] It is of course to be understood that the present invention is not intended to be restricted to the foregoing example, which is described by way of illustration only.