Personal cleansing composition

Abstract

Disclosed are water-based personal cleansing compositions having an isotropic surfactant phase, the compositions containing (a) a cationic surfactant comprising a quaternary ammonium compound and / or an amidoamine, (b) a cleansing surfactant, and (c) water, the cleansing surfactant containing 85 to 100 wt% of a combination of a specific ratio of a betaine surfactant and a taurinate surfactant; also disclosed is a method of thickening such compositions by the addition of an electrolyte.

Description

[0001] This application is a divisional application of Chinese invention patent application filed on August 22, 2018, with application number 201880068074.5 and invention title "Personal Cleaning Composition". Technical Field

[0002] This invention relates to personal hygiene compositions, and more particularly to water-based personal hygiene compositions, including, for example, shower gels, facial cleansers, and shampoos. Background Technology

[0003] The choice, amount, and relative amount of cleaning surfactants all contribute to the microstructure of personal care compositions. In turn, microstructure can affect rheological properties, such as composition viscosity and viscosity build-up characteristics, and also contribute to the stability of the composition.

[0004] Sufficient amounts of cleaning surfactant are generally required for surfactant molecules to assemble into micelles and for micelles to aggregate to form structures. Commercially available water-based cleaning compositions often contain more than 12% by weight of cleaning surfactant. The main cleaning surfactant component of such compositions is typically an alkyl and / or alkyl ether sulfate surfactant; lauryl and lauryl alcohol polyether sulfate surfactants are known to provide good detergency and are among the commonly used sulfate surfactants. Sulfate surfactants belong to a class of materials called anionic surfactants. Sulfate surfactants are often used with amphoteric co-surfactants; betaine surfactants such as cocamidopropyl betaine and cocamidopropyl betaine are among the commonly used amphoteric surfactants. Betaine surfactants help to blow foam and are generally milder than sulfate surfactants, although they do not have the detergent power of sulfate surfactants. Advantageously, personal cleaning compositions based on sulfate surfactants can normally be thickened by adding a simple salt.

[0005] Although sulfate surfactants are widely used in personal care compositions, there is considerable interest in milder alternatives, including compositions in which the anionic surfactant is or includes a taurine surfactant.

[0006] US6569825 discloses an aqueous cleaning composition comprising (a) a short-chain anionic surfactant selected from C6-C9 alkyl ether sulfates, C8-C9 alkyl ether sulfates, C9 ... 11 Acyl lactyl lactates, C6-C9 acyl methyl taurine, C6-C9 acyl hydroxyethanesulfonates, C6-C 11 Fatty acid soaps, C6-C9 alkyl sulfates, C6-C 11(a) Acylsarcosine salts, C6-C9 alkyl sulfosuccinates, C6-C9 alkyl ether sulfosuccinates, or mixtures thereof; (b) long-chain anionic surfactants selected from: C 13 -C 18 Alkyl ether sulfate, C 13 -C 18 Acyl lactyl lactate, C 13 -C 16 Acylmethyl taurine, C 13 -C 15 Acyl hydroxyethanesulfonate, C 13 -C 16 Alkyl sulfates, C 13 -C 16 Acylsarcosine salt, C 13 -C 16 Alkyl sulfosuccinate, C 13 -C 16 (c) Alkyl ether sulfosuccinate or a mixture thereof; (c) Optionally, a medium-chain anionic surfactant selected from: C 10 -C 12 Alkyl ether sulfate, C 12 Acyl lactyl lactate, C 10 -C 12 Acylmethyl taurine, C 10 -C 912 Acyl hydroxyethanesulfonate, C 10 -C 12 Alkyl sulfates, C 12 Acylsarcosine salt, C 10 -C 12 Alkyl sulfosuccinate, C 10 -C 12 Alkyl ether sulfosuccinate, or a mixture thereof, and (d) water; wherein at least one of surfactants (a) and (b) is selected from acyl lactyl lactate, acyl sarcosinate, or a short-chain anionic surfactant (a) having a C9 to C9 ratio. 11(i) Fatty acid soap; (ii) If surfactant (c) is present, surfactants (a), (b) and (c) are present in an amount such that the weight ratio of (c):[(a) + (b)] is less than 1:1. In the disclosed examples and comparative examples: Comparative Example F, allegedly containing 10% cocoether sulfate (3EO) + 5% cocamidoside betaine; Comparative Example G, allegedly containing 10% C8 taurine + 5% cocamidoside betaine; and Example 3, allegedly containing 7% cocoether sulfate (3EO) + 3% C8 taurine + 5% cocamidoside betaine. In the comments on the foam and Zion test data of these compositions, wherein the Zion test data is allegedly an indicator of the mildness of the composition, the patent reports that the addition of C8 taurine to the blend of Example 3 increased foam without adversely affecting mildness. Comparative Examples F, G, and 3 all report foam volumes of 79 ml, 44 ml, and 145 ml, respectively.

[0007] CN 104997661 discloses a purportedly mild, silicone-free shampoo comprising the following ingredients: acrylate / stearyl ether-20 methacrylate copolymer, cocamidopropyl betaine, polyquaternium-10, disodium lauroyl amphoteric acetate, methyl cocoyl taurate, behenyltrimethylammonium chloride, stearamide-propyl dimethylamine, ethylene glycol distearate, quaternium-27, and a cationic conditioning agent, in amounts as more specifically described herein, comprising a composition having the following content: acrylate / stearyl ether-20 methacrylate copolymer 1-6%, cocamidopropyl betaine 20-40%, polyquaternium-10 The composition contains 0.25–1.25% disodium lauroyl amphotericate, 2.5–15% methyl cocoyl taurate, 0.5–3% behenyltrimethylammonium chloride, 0.5–3% stearamide propyl dimethylamine, 1–3% ethylene glycol distearate, 0.5–3% quaternary ammonium salt-27, and 1–4% cationic conditioner. It is claimed that the composition does not contain sulfate surfactants.

[0008] WO 99 / 32079 discloses a shampoo composition comprising a silicone microemulsion, at least one surfactant (which is a cationic derivative of guar gum), and a deposited polymer. On page 9, line 20, and page 10, line 4, the patent publication states: “Superior optical transparency and stability over a wide temperature range can be achieved by using a combination of the following amounts of cleaning surfactants: 4-8% by weight of acylmethyl taurate and / or acylated collagen peptides of total shampoo composition; and up to 8% by weight of total shampoo composition of cocamidopropyl betaine.” US 2014 / 086864 discloses a shampoo composition comprising a taurine derivative surfactant, an amphoteric surfactant (which is an alkylamide betaine), a cationic conditioning polymer, a betaine surfactant containing a quaternary ammonium group, and a silylated urethane polymer containing a quaternary ammonium group. Regarding use on dyed hair, the composition is claimed to have excellent fading inhibition properties, and is claimed to be in “in use feeling.” Examples include compositions containing, among other ingredients, 6 to 24% by mass of coconut oil fatty acid methyl taurine and coconut oil fatty acid amamidopropyl betaine.

[0009] JP 2001-220325 A2 discloses a hair shampoo composition having a combination of acyl taurine and betaine surfactant. The composition further comprises an alkyl bis(dihydroxypropyl)amine represented by the following formula: R 7 N(CH2CH(OH)CH2OH)2, where R 7 It is an alkyl or alkenyl group having 8 to 22 carbons.

[0010] Achieving acceptable composition viscosity is a crucial factor in providing mild personal care compositions that can be applied in a controlled manner and are easy to spread during use. Composition viscosity, along with properties such as foaming ability, can also influence user perception of such products. Developing a microstructure that produces the desired rheological properties can be challenging when eliminating sulfate surfactants or significantly reducing their content, especially in the case of mild compositions with low surfactant content; additionally, achieving viscosity by adding simple salts to such compositions can be problematic. Reducing or eliminating sulfate surfactants can also be problematic in formulating mild cleaning compositions stable at acidic pH levels.

[0011] One approach to addressing the issue of thickening systems containing little or no sulfate-free surfactants is to use sulfate-free surfactants in conjunction with a polymeric thickener. The polymeric thickener may have a gelling effect, transforming products that typically exhibit Newtonian rheology under low shear conditions (e.g., experienced during spread-out application, metered feeding, or use) into non-Newtonian rheological products. Besides being detectable by the user as an undesirable deviation from product specifications, the use of such a thickener can further limit the ability to subsequently adjust the viscosity of the composition using simple salts.

[0012] Using relatively high concentrations of non-sulfate surfactants can also help achieve viscosities in systems that are sulfate-free or substantially sulfate-free. However, the required concentration of non-sulfate surfactants can be higher than conventional specifications, and can also result in anisotropic surfactant systems with relatively unstable liquid crystal structures or domains. In contrast to isotropic surfactant systems where relatively unstable microstructures tend to enhance foaming efficiency, liquid crystal microstructures tend to "traps" surfactants and impair foaming ability. Furthermore, liquid crystal structures or domains can impede light transmission and can impart a cloudy or hazy appearance to the composition, which can be problematic when translucency is desired.

[0013] One aspect of the invention is to provide mild personal care compositions having desired rheological properties, including compositions having a relatively low surfactant content. Another aspect of the invention is to provide mild personal care compositions having an isotropic surfactant phase, including compositions stable at acidic pH. Yet another aspect of the invention is to provide mild personal care compositions comprising low surfactant content compositions containing no or substantially no sulfate surfactants, the viscosity of which can be increased by adding an electrolyte such as a simple salt. Still another aspect of the invention is to provide mild personal care compositions having a translucent or transparent appearance.

[0014] One or more aspects of the present invention can be achieved by the compositions and methods described below.

[0015] This invention also relates to the following items.

[0016] 1. A personal hygiene composition comprising: a) Cationic surfactants that contain quaternary ammonium compounds and / or amide amines, b) 5 to 15% by weight of cleaning surfactant, and c) Water, in: The cleaning surfactant contains 85 to 100% by weight of a combination of betaine surfactant and taurine surfactant, wherein: When the composition contains 5 to 6% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 55:45 to 45:55. When the composition contains more than 6% by weight to at most 10% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 40:60; and When the composition contains more than 10% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 20:80.

[0017] 2. The personal care composition according to Item 1, wherein the quaternary ammonium compound comprises one to three long-chain alkyl groups having inter-ester, ether, or amide chains linked together, wherein the alkyl groups are saturated or unsaturated.

[0018] 3. The personal care composition according to any one of the foregoing items, wherein the quaternary ammonium compound comprises a monoalkyl and / or dialkyl quaternary ammonium compound.

[0019] 4. The personal care composition according to any one of the preceding items, wherein the betaine surfactant is amide betaine and the taurine surfactant is acyl taurine.

[0020] 5. The personal care composition according to any one of the preceding items, wherein the betaine surfactant comprises cocamidopropyl betaine, and the taurine surfactant comprises sodium methylcocoyl taurate.

[0021] 6. The personal cleaning composition according to any one of the preceding items, wherein the composition contains 6 to 12% by weight of a cleaning surfactant based on the total weight of the composition.

[0022] 7. The personal care composition according to any one of the preceding items, wherein the composition has an isotropic surfactant phase.

[0023] 8. The personal care composition according to any one of the foregoing items, wherein the composition is substantially free of sulfate surfactants.

[0024] 9. The personal care composition according to any one of the foregoing items is transparent.

[0025] 10. The personal cleaning composition according to any one of the preceding items, having a pH of 4 to 6.

[0026] 11. The personal cleaning composition according to any one of the foregoing items is substantially free of (meth)acrylate polymers and copolymers.

[0027] 12. The personal care composition according to any one of the foregoing items, further comprising an electrolyte.

[0028] 13. A method for adjusting the viscosity of a composition, the method comprising the following steps: I) Provide the composition according to any one of items 1 to 11; and II) Add an electrolyte to the composition. The addition of the electrolyte increases the viscosity of the resulting composition. Summary of the Invention

[0029] According to the present invention, it has been found that the inclusion of cationic surfactants in personal cleaning compositions containing taurine surfactants, preferably acyl taurine surfactants, and betaine surfactants can enhance the development and / or strength of the surfactant phase, even at relatively low concentrations of cleaning surfactants, and can allow the composition to be further thickened by the addition of electrolytes such as simple salts.

[0030] In one embodiment, a personal hygiene composition is provided, comprising: a) Cationic surfactants that contain quaternary ammonium compounds and / or amide amines, b) 5 to 15% by weight of cleaning surfactant, and c) Water; Based on the total weight of the cleaning surfactant, the cleaning surfactant contains a combination of 85 to 100% by weight of betaine surfactant and taurine surfactant, and wherein: When the composition contains 5 to 6% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 55:45 to 45:55. When the composition contains more than 6% by weight to at most 10% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 40:60; and When the composition contains more than 10% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 20:80.

[0031] Preferably, the composition has an isotropic surfactant phase.

[0032] According to another embodiment of the present invention, a method for adjusting the viscosity of a composition is provided, the method comprising the following steps: I) Provide a personal hygiene composition comprising: a) Cationic surfactants that contain quaternary ammonium compounds and / or amide amines, b) 5 to 15% by weight of cleaning surfactant, and c) Water; The cleaning surfactant contains 85 to 100% by weight of a combination of betaine surfactant and taurine surfactant, and wherein: When the composition contains 5 to 6% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 55:45 to 45:55. When the composition contains more than 6% by weight to at most 10% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 40:60; and When the composition contains more than 10% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 20:80; and II) Add an electrolyte to the composition. The addition of the electrolyte increases the viscosity of the composition. Attached Figure Description

[0033] Figure 1 A graph showing the shift of the crossover frequency under dynamic oscillations when stearamidopropyl dimethylamine is added to a composition having a combined content of 8.25% by weight of taurine surfactant and betaine surfactant, with a weight ratio of betaine surfactant to taurine surfactant of 50:50.

[0034] Figures 2 to 7 The relaxation time (T0) of a composition containing taurine surfactant, betaine surfactant, and stearamide propyl dimethylamine in various amounts. r The ternary plots are derived from dynamic vibration measurements performed using a TA ARES-G2 rheometer with the configuration described below, under the conditions described below. Detailed Implementation

[0035] Unless otherwise specified, "%" as used herein means % by weight, or % by weight. Unless otherwise specified, the amounts of components mentioned in the compositions of the present invention by weight are based on the total weight of the composition. Unless otherwise specified, all ratios are by weight. Unless otherwise indicated, the amounts of components mentioned in the composition refer to the amounts of the components as active ingredients.

[0036] All numerical ranges used in this specification should be understood to be modified by the word “about”. Numerical ranges should be understood to encompass the explicitly disclosed range, and the ranges included therein. When the system or method of the invention is described as “comprising” or “including” specific components and / or features, a narrower embodiment “consistently made of” or “comprises” the described components and / or features is also contemplated.

[0037] cationic surfactants Included in the cationic surfactants applicable to this document are quaternary ammonium compounds of the following formula: N + R 1 R 2 R 3 R 4 X - (I) Where R 1 R 2 R 3 and R 4 Independently hydrogen, benzyl, or C1 to C2 30 Alkyl, and wherein R 1 R 2 R 3 and R 4 One, two, or three independently are C6 to C 30 Alkyl (“long-chain alkyl”), and one or more other R 1 R 2 R 3 and R 4 The group is hydrogen, benzyl, or C1 to C4 alkyl (“lower alkyl”), and X is a solubilizing anion. A suitable solubilizing anion is a halide ion. In one embodiment, R 1 R 2 R 3 and R 4 One or two of them are long-chain alkyl groups, and the other R 1 R 2 R 3 and R 4 The group is hydrogen, benzyl, or a lower alkyl group. Where R... 1 R 2 R 3 and R 4 One of them is a long-chain alkyl group while the other R 1 R 2 R 3 and R 4 Compounds of formula I with hydrogen, benzyl, or lower alkyl groups are referred to herein as monoalkyl quaternary ammonium compounds (quats); wherein R 1 R2 R 3 and R 4 Two of them are long-chain alkyl groups, while the other R 1 R 2 R 3 and R 4 Compounds of formula I with hydrogen, benzyl, or lower alkyl groups are referred to herein as dialkyl quaternary ammonium compounds; wherein R 1 R 2 R 3 and R 4 Three of them are long-chain alkyl groups, while the other R 1 R 2 R 3 and R 4 Compounds of Formula I with hydrogen, benzyl, or lower alkyl groups are referred to herein as trialkyl quaternary ammonium compounds. In one embodiment, the long-chain alkyl group of the Formula I quaternary ammonium compound is independently C6 to C6. 24 Alkyl group. In another embodiment, the long-chain alkyl group of the formula I quaternary ammonium compound is independently C8 to C9. 22 alkyl.

[0038] The long-chain alkyl group of formula (I) quaternary ammonium compound may be saturated or unsaturated; the long-chain alkyl group may comprise ester, ether, or amide chain linkages. In one embodiment, the cationic surfactant is an amide-based quaternary ammonium compound of the following formula: CH3(CH2) r C(O)NH(CH2) t N + R 13 R 14 R 15 X 1- (IA) Where r is 5 to 24, t is 2 or 3, and R 13 R 14 and R 15 Independently a lower alkyl group, preferably methyl, and X 1 The solubilizing anion is preferably a halide ion. In one embodiment, r is 5 to 22.

[0039] Examples of suitable quaternary ammonium compounds include cetyltrimethylammonium chloride, behenyltrimethylammonium chloride, tetramethylammonium chloride, tetraethylammonium chloride, octyltrimethylammonium chloride, dodecyltrimethylammonium chloride, decyldimethylbenzylammonium chloride, stearyldimethylbenzylammonium chloride, didodecyldimethylammonium chloride, dioctadecyldimethylammonium chloride, tallow trimethylammonium chloride, di(hydrogenated tallow)dimethylammonium chloride, cocoyltrimethylammonium chloride, and palmitamide propyltrimethylammonium chloride. A particularly useful quaternary ammonium compound is behenyltrimethylammonium chloride, and another particularly useful quaternary ammonium compound is palmitamide propyltrimethylammonium chloride.

[0040] Another class of cationic surfactants suitable for this article are amide amines. Suitable amide amines are condensation products of fatty acids and multifunctional amines, such as amide amines represented by the following formula: R 5 R 6 N-(CH2) x -NHC(O)R 7 (II) Where R 5 and R 6 Independently methyl or ethyl, x is 2 or 3, and R 7 C6 to C 30 Alkyl group. In one embodiment, R 7 C6 to C 24 Alkyl group. R 7 It can be saturated or unsaturated. In one embodiment, R 5 and R 6 The methyl group is 3. Examples of such amide amines include stearamidopropyl dimethylamine, stearamidoethyl diethylamine, stearamidopropyl diethylamine, palmitamidopropyl dimethylamine, palmitamidoethyl dimethylamine, behenamidopropyl dimethylamine, behenamidoethyl dimethylamine, and arachidamidopropyl dimethylamine. A particularly useful amide amine is stearamidopropyl dimethylamine.

[0041] Without being bound by theory, it is believed that in the presence of protonating agents such as organic or inorganic acids, amide amines can form essentially non-permanent quaternary ammonium or pseudo-quaternary ammonium cationic surfactants. Examples of acids suitable as protonating agents include, for example, hydrochloric acid, acetic acid, tartaric acid, lactic acid, malic acid, and citric acid. The mention of amide amines encompasses both protonated and non-protonated forms of surfactants.

[0042] In one embodiment, the cationic surfactant comprises a mixture of a Formula II amide amine and a Formula I quaternary ammonium compound. In one embodiment, the cationic surfactant comprises a mixture of a Formula I (A) amide quaternary ammonium compound and a Formula II amide amine. In one embodiment, the cationic surfactant comprises a monoalkyl quaternary ammonium compound, a dialkyl quaternary ammonium compound, and / or an amide amine.

[0043] In one embodiment, the personal care composition of the present invention contains a cationic surfactant in a total amount of up to 2% by weight based on the total weight of the composition. In another embodiment, the composition contains a cationic surfactant in a total amount of up to 1.5% by weight based on the total weight of the composition. In yet another embodiment, the personal care composition contains a cationic surfactant in a total amount of 0.05 to 1% by weight based on the total weight of the composition. In yet another embodiment, the personal care composition contains a cationic surfactant in a total amount of 0.1 to 0.5% by weight based on the total weight of the composition. In yet another embodiment, the personal care composition contains a cationic surfactant in a total amount of 0.1 to 0.3% by weight based on the total weight of the composition.

[0044] Cleaning surfactants As used herein, the term "cleaning surfactant" refers to anionic and amphoteric / amphoionic surfactants; cationic and nonionic surfactants are not considered part of the cleaning surfactant category. The cleaning surfactants of this invention include both taurine surfactants and betaine surfactants. In one embodiment, the cleaning surfactant is present in an amount of 5 to 15% by weight based on the total weight of the personal care composition. In another embodiment, the cleaning surfactant is present in an amount of 6 to 12% by weight based on the total weight of the personal care composition. In yet another embodiment, the cleaning surfactant is present in an amount of 6 to 10% by weight based on the total weight of the personal care composition. In still another embodiment, the cleaning surfactant is present in an amount of 8 to 10% by weight based on the total weight of the personal care composition.

[0045] Taurine surfactants The taurine surfactants used herein include amides of taurine or N-methyltaurine and their salts, such as acyl taurines represented by the following general formula: R 8 C(O)N(R 9 (CH2) y SO3M (IIIa), preferably an acyl taurine salt represented by the following general formula: R 8 C(O)N(R 9 CH2CH2SO3M (IIIb) Where R 8 C6 to C 30 More preferably C6 to C 24 Alkyl group, y is 2 or 3, R 9 R is hydrogen or methyl, and M is a solubilizing cation, such as, for example, hydrogen, ammonium, alkali metal cation, lower (i.e., C to C4) alkanol ammonium cation, or basic amino acid cation. In one embodiment, R 8 C8 to C 18 Alkyl groups. In one embodiment, at least half of the R 8 The group is C8-C 18 Alkyl group. In another embodiment, at least half of the R 8 The group is C 10 To C 14 Alkyl group. R 8 It can be saturated or unsaturated. In one implementation, R 9 It is a methyl group.

[0046] Suitable acyl taurates according to formula IIIa include, for example, taurates commonly referred to as: sodium methyl lauroyl taurate, potassium methyl lauroyl taurate, sodium methyl myristoyl taurate, potassium methyl myristoyl taurate, ammonium methyl myristoyl taurate, sodium methyl cocoyl taurate, potassium methyl cocoyl taurate, ammonium methyl cocoyl taurate, sodium methyl oleoyl taurate, potassium methyl oleoyl taurate, ammonium methyl oleoyl taurate, sodium lauroyl taurate, potassium lauroyl taurate, ammonium myristoyl taurate, sodium cocoyl taurate, potassium oleoyl taurate, etc. In one embodiment, a salt of the coconut fatty acid amide of N-methyl taurine is of particular interest.

[0047] betaine surfactant The betaine used in this article is represented by the following general formula: R 10 [C(O)NH-(CH2) y ] z -N + (R 11 (R) 12 CH2CO2 - (IV) Where R 10 C6 to C 30 Especially C6 to C 24 Alkyl group, z is 0 or 1, R 11 and R 12 Alkyl, hydroxyalkyl, or carboxylalkyl groups having 1 to 3 carbon atoms, and y is 2 or 3; and their salts. In one embodiment, half of R 10 Groups are C8 to C18 Alkyl group. In another embodiment, at least half of the R 10 The group is C 10 To C 14 Alkyl group. R 10 It can be saturated or unsaturated. In one implementation, R 10 Derived from coconut oil or palm kernel oil. In one embodiment, R 11 and R 12 It is a methyl group.

[0048] Formula (IV) betaines include simple betaines: R 10 -N + (R 11 (R) 12 CH2CO2 - (IVa) Where R 10 R 11 and R 12 As described above, and amide betaine: R 10 C(O)NH-(CH2) y -N + (R 11 (R) 12 CH2CO3 - (IVb) Where R 10 R 11 R 12 y is as described above.

[0049] In one embodiment, the betaine surfactant is amide betaine, preferably cocamidopropyl betaine.

[0050] While it is anticipated that a cleaning surfactant, in addition to taurine and betaine surfactants, will be included, such additional cleaning surfactants, when present, are a minor component of the total cleaning surfactant. In one embodiment, the cleaning surfactant comprises a combination of betaine and taurine surfactants at a weight of 85 to 100% by weight based on the total weight of the personal care composition. In another embodiment, the cleaning surfactant comprises a combination of betaine and taurine surfactants at a weight of 90 to 100% by weight based on the total weight of the personal care composition. In one embodiment, the cleaning surfactant comprises a combination of betaine and taurine surfactants at a weight of 95 to 100% by weight based on the total weight of the personal care composition. In yet another embodiment, the cleaning surfactant comprises a combination of betaine and taurine surfactants at a weight of 99 to 100% by weight based on the total weight of the personal care composition.

[0051] In one embodiment, the personal care composition is free of or substantially free of sulfate surfactants. "Substantially free of sulfate surfactants" means that the amount of sulfate surfactants (if present) does not exceed 0.5% by weight of the composition. In one embodiment, the composition is free of or substantially free of additional anionic surfactants. "Substantially free of additional anionic surfactants" means that the amount of anionic surfactants other than taurine surfactants does not exceed 0.5% by weight of the composition.

[0052] In one embodiment, when the personal care composition contains 5 to 6% by weight or less of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 55:45 to 45:55, preferably 50:50 to 45:55. In one embodiment, when the composition contains more than 6% by weight to at most 10% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 40:60, preferably 75:25 to 50:50. In one embodiment, when the composition contains more than 10% by weight to at most 15% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 20:80, preferably 75:25 to 25:75.

[0053] water Water is also included in the personal care composition of the present invention. Water is typically present in a total amount of 70 to 95% by weight. In one embodiment, water is present in a total amount of 75 to 95% by weight. In another embodiment, water is present in a total amount of 85 to 93% by weight. In yet another embodiment, water is present in a total amount of 85 to 90% by weight.

[0054] electrolytes The personal hygiene compositions of the present invention may further comprise an electrolyte. The addition of an electrolyte helps to adjust the viscosity of the composition. An electrolyte is a material that is soluble in water and ionizes. This term excludes materials such as cleaning surfactants and cationic surfactants, as well as other materials that aggregate in solution. Electrolytes used herein are simple salts of organic or inorganic acids. Hydrochlorides, nitrates, sulfates, and carboxylates are suitable salts. Examples of suitable electrolytes are sodium chloride, ammonium chloride, magnesium chloride, sodium sulfate, and sodium citrate. Typically, electrolytes are relatively small molecules that often have a nominal molecular weight of less than 600 g / mol.

[0055] When present, the total amount of electrolyte is preferably less than 5% by weight, more preferably less than 4% by weight, based on the total weight of the personal care composition. In one embodiment, the electrolyte is present in an amount of 0.05 to 3% by weight based on the total weight of the personal care composition. In another embodiment, the electrolyte is present in an amount of 0.1 to 2% by weight based on the total weight of the personal care composition. In yet another embodiment, the electrolyte is present in an amount of 0.1 to 1.5% by weight. In yet another embodiment, the electrolyte is present in an amount of 0.1 to 1% by weight based on the total weight of the personal care composition.

[0056] While the addition of electrolytes can help build the viscosity of the composition, excessively high concentrations can reduce the composition's translucency. When translucency or transparency is desired, the amount of cleaning surfactant and the relative amounts of betaine and taurine surfactants should be chosen such that building the viscosity requires little or no addition of electrolytes, while maintaining a level of cleaning surfactant that does not undesirably affect the amount of light transmitted through the composition. In this respect, a total cleaning surfactant content of 6 to 10 by weight can be of particular interest.

[0057] Excluding pre-diluted products, products formulated as relatively non-sticky products, or "water-thinned" products used in applicators such as pump-type foamers, the personal cleaning compositions of the present invention have, or are adjusted to, a viscosity in the range of 2500 cP to 10000 cP, depending on the specific product form of the composition and its desired thickness. In one embodiment, a viscosity in the range of 3000 to 9000 cP is of interest. In another embodiment, a viscosity in the range of 3500-8000 cP is of interest. In yet another embodiment, a viscosity in the range of 4000-6000 cP is of interest. Unless otherwise stated, the viscosity mentioned is a measurement obtained using an AR2000EX rheometer from TA Instruments (30°C, 1 mm slit, 90-second equilibration time, 30-second measurement, 4 reciprocal seconds, 40 mm steel plate ingot).

[0058] The personal hygiene compositions of the present invention are generally formulated to a pH of 3.5 to 7.0. In one embodiment, it is of interest to formulate a composition to a pH of 4 to 6. In another embodiment, it is of interest to formulate a composition to a pH of 4 to 5. In one embodiment, the composition has a pH of 4 to 5 when the cationic surfactant comprises an amide amine.

[0059] Other optional ingredients The personal care composition of the present invention may contain one or more additional ingredients for enhancing performance and / or user appeal. Such ingredients include, for example, several examples: fragrances, fragrance encapsulants, plant extracts, fruit extracts, and other emotives, dyes, pigments, pH adjusters, buffers, pearlescent agents, opacifiers, preservatives, humectants, suspending agents, skin and / or hair conditioning agents, skin and / or hair nutrients, vitamins, amino acids, preservatives, and bactericides. In one embodiment, the total amount of such additional optional ingredients is less than 15% by weight of the personal care composition. In another embodiment, the total amount of such additional optional ingredients is less than 10% by weight of the personal care composition. In yet another embodiment, the total amount of such additional optional ingredients is 0.01 to 5% by weight of the personal care composition. The amount of the additional optional ingredients depends in part on the specific ingredient, its intended use, and the properties desired from its use.

[0060] In one embodiment, the personal care composition is free of or substantially free of (meth)acrylate polymers and copolymers. "Substantially free of (meth)acrylate polymers or copolymers" means that the total amount of such polymers and copolymers (if present) does not exceed 0.01% by weight of the personal care composition. In one embodiment, the personal care composition is free of or substantially free of silylated urethane polymers containing quaternary ammonium groups. "Substantially free of silylated urethane polymers containing quaternary ammonium groups" means that the total amount of such polymers (if present) is less than 0.01% by weight of the personal care composition. In one embodiment, the personal care composition is free of or substantially free of cationic derivatives of guar gum. "Substantially free of cationic derivatives of guar gum" means that, if present, their total amount is less than 0.01% by weight of the composition.

[0061] Personal care compositions can be prepared using conventional techniques, in which cationic surfactants and cleaning surfactants are dissolved in water, typically with heating and stirring, and cooled, if necessary, to a temperature that allows for the subsequent addition of other components. Cooling and subsequent addition of components can be staged based on the nature of the added ingredients. For example, fragrances and other volatile components are typically added when the composition is below their evaporation temperature. The heated surfactant solution containing the cationic surfactant should not be cooled too rapidly to prevent precipitation of the cationic surfactant.

[0062] The personal hygiene compositions of the present invention can be provided in a wide variety of product forms, including, for example, shower gels, facial cleansers, and shampoos. In one embodiment, compositions in shampoo form are of particular interest. Personal hygiene compositions are typically diluted with water and act as foams. Unless otherwise expressly stated, percentages of composition ingredients described herein refer to the composition before dilution for use, i.e., in the composition as packaged. Personal hygiene compositions can be provided in packaging that includes instructions conveying that the composition is to be applied, foamed, and rinsed off.

[0063] Example In the following examples, stearamide propyl dimethylamine is referred to as “TAS”, cocamidopropyl betaine is referred to as “CAPB” or “betaine”, and sodium cocoyl taurate is referred to as “taurate”. In the tables below, the reported weight percent of the listed ingredients is given as if such ingredients were added separately. For example, the reported weight percent of disodium EDTA, sodium chloride, and sodium benzoate does not take into account any such materials (if any) included as part of any ingredient identified by trademark in the table. The compositions described in Tables 1, 2A, and 3 below were prepared using the following general procedure: Heat the water (deionized) of the initial aliquot sample to a target temperature of 63°C to 65°C; if using, add the cationic surfactant (stearoamide dimethylamine and / or behenyltrimethylammonium chloride, behenyltrimethylammonium chloride (BTAC) is provided as a mixture with dipropylene glycol), and mix until dissolved. Stop heating, add sodium cocoyl taurate (Pureact WS Conc), and mix until dissolved; add cocamidopropyl betaine (Tego® Betain CKKB5), and mix for approximately 5 minutes. When the mixture cools to 40°C to 43°C, add additional water (deionized), to which polyquaternium-10 is mixed. Then add disodium EDTA, sodium benzoate, flavoring agent, and citric acid, and mix for 10 minutes.

[0064] Example 1 A series of samples as described in Table 1 were prepared using the general procedure described above (each sample series consisted of 6 compositions; TAS was present in amounts of 0 (without TAS), 0.1, 0.2, 0.3, 0.4 or 0.5% by weight).

[0065] Table 1

[0066] Tego® Betain CK KB5, from Evonik Industries; ≈30% cocamidopropyl betaine Pureact WS CONC, from Innospec Performance Chemicals; ≈30% Sodium Methyl Cocoyl Taurate The viscoelastic properties of the composition under resonant oscillations were obtained using a TA ARES-G2 rheometer with a 50 mm parallel plate geometry (1 mm slit). Measurements were performed at 25 °C. The elastic modulus (G') and loss modulus (G") of the composition were measured as a function of frequency by applying a frequency range of 0.01 to 100 Hz to the composition at 1% strain. The isotropic surfactant phase is a surfactant phase in which the microstructure of the dominant surfactant is micelles of aggregated surfactant molecules. Preferably, the surfactant phase is an isotropic, rod-shaped micelle system, i.e., a system in which the microstructure of the dominant surfactant is generally rod-shaped micelles. For the isotropic, rod-shaped micelle system, the oscillatory response is similar to the Maxwell spring and damper model, where at the crossover frequency (where the crossover frequency represents the frequency in which G' = G"), the ratio of the slope of G' to the slope of G" is approximately 2 to 1.

[0067] Figure 1To compare the elastic modulus (G') and elastic loss modulus (G") of compositions of the E series (8.25 wt% taurate and betaine; betaine:taurate weight ratio 50:50) at 0 or 0.5 wt% stearamidopropyl dimethylamine content, the graph shows a shift in the cross-frequency of the addition of stearamidopropyl dimethylamine, confirming its effectiveness in constructing the micelle structure of the composition. Below the cross-section of G' and G" is the ratio of the slope of G' to the slope of G" being approximately 2:1, indicating that the composition possesses an isotropic, rod-shaped micelle system.

[0068] The reciprocal of the frequency at the intersection of G' and G" (where G' = G") is the characteristic relaxation time, or "relaxation time" or T. r The relaxation times of the A to F series compositions are shown in Figures 2 to 7 In the ternary graph; relaxation time is reported in milliseconds (ms).

[0069] Figure 2 The plot shows the relaxation times of the compositions in the Sample A series. The relaxation times are very short, ranging from 21.1 ms to 54.2 ms; no crossover frequency was observed for the compositions containing 0.1 to 0.3 wt% stearamidopropyl dimethylamine, indicating that these compositions did not build sufficient micellar structure to provide measurable relaxation times.

[0070] Figure 3 A graph showing the relaxation times of the compositions in Sample B series. The relaxation times ranged from 31.4 ms to 267.8 ms. It shows that the relaxation time increased from 31.4 ms in the composition without stearamidopropyl dimethylamine to 267.8 ms in the composition containing 0.2 wt% stearamidopropyl dimethylamine. Between 0.3 and 0.5 wt% stearamidopropyl dimethylamine, the relaxation time decreased from 185.0 ms to 84.9 ms, but remained significantly higher than the relaxation time of the composition without stearamidopropyl dimethylamine.

[0071] Figure 4 This is a graph showing the relaxation times of the compositions in series C. The relaxation times are shown as increasing from 67.6 ms for the composition without stearamidopropyl dimethylamine to 83.6 ms for the composition containing 0.1 wt% stearamidopropyl dimethylamine. Between 0.2 and 0.5 wt% stearamidopropylamine, the relaxation time decreases from 48.2 ms to 14.0 ms. The reported relaxation times are generally consistent with those of compositions having a relatively weak micellar structure.

[0072] Figure 5The plot shows the relaxation times of the compositions from sample series D. The plotted relaxation times are relatively short, ranging from 33.1 ms to 41.2 ms. The reported relaxation times are generally consistent with those of compositions having a relatively weak micellar structure.

[0073] Figure 6 This is a graph showing the relaxation times of the compositions in the E series of samples. The relaxation times range from 101.0 ms to 666.7 ms. The relaxation times are shown to increase with increasing stearamide propyl dimethylamine content.

[0074] Figure 7 This is a graph showing the relaxation times of the compositions in the F series. The relaxation times range from 303.0 ms to 454.5 ms, and the relaxation time increases with increasing stearamide propyl dimethylamine content up to 0.4 wt% of the composition. The relaxation times of the compositions containing 0.4 wt% stearamide propyl dimethylamine and the compositions containing 0.5 wt% stearamide propyl dimethylamine are substantially the same.

[0075] Figures 2 to 7 The figure shows that the content of cleaning surfactant and the amount of betaine surfactant relative to taurine surfactant can significantly affect the ability of stearamidopropyl dimethylamine to help construct micelle structures.

[0076] Example 2 The compositions described in Table 2A were prepared according to the general procedure described above. The pH range of the compositions was 4.0 to 4.7. The initial viscosity of each of the resulting compositions was measured. A viscosity modifier was post-added to the initially formed TAS-containing composition (as indicated); sodium chloride was used to increase viscosity, or PPG-9 was used to decrease viscosity. Based on the total weight of the initially formed composition, the viscosity modifier was post-added until a target viscosity of 4000 to 8000 cP was obtained, or the amount of viscosity modifier added reached the maximum total amount. The viscosity modifier was post-added in increments of 0.05 wt% up to 0.2 wt% of the total amount, and then in increments of 0.1 wt% up to a maximum total amount of 2.0 wt%. Based on the total weight of the initially formed composition, sodium chloride was post-added to the TAS-free C1 and C2 compositions in increments of 0.2, 0.3, and 0.5 wt% up to a total amount of 1.0 wt%. With total salt additions of 0.2 wt%, 0.5 wt%, and 1.0 wt%, the adjusted viscosities of the C1 composition were 2656 cP, 2508 cP, and 2706 cP, respectively. With total salt additions of 0.2 wt%, 0.5 wt%, and 1.0 wt%, the adjusted viscosities of the C2 composition were 6197 cP, 6443 cPs, and 7093 cP, respectively. Viscosities were measured using an AR2000EX rheometer from TA Instruments (30°C, 1 mm slit, 90 sec equilibration time, 30 sec measurement, A-4 1 / s, 40 mm steel plate ingot).

[0077] Table 2A

[0078] Tego Betain CK KB5, from Evonik Industries; ≈30% cocamidopropyl betaine Pureact WS Conc, from Innospec Performance Chemicals; ≈30% Sodium Methyl Cocoyl Taurate Table 2A - Continued

[0079] Tego Betain CK KB5, from Evonik Industries; ≈30% cocamidopropyl betaine Pureact WS Conc., from Innospec Performance Chemicals; ≈30% Sodium Methyl Cocoyl Taurate Samples 1 to 6 and comparative samples C3 to C6 all contained 0.1 wt% stearamide propyl dimethylamine. Samples 4 and 5 (12.5 wt% cleaning surfactant content; betaine:taurine weight ratios of 75:25 and 50:50, respectively) had initial viscosities higher than the target range and needed to be adjusted downwards. The viscosity of sample 6 (12.5 wt% cleaning surfactant content; betaine:taurine weight ratio of 25:75) was brought to the target range by adding 2.0 wt% sodium chloride. Sample C6 (8.25 wt% cleaning surfactant content; betaine:taurine weight ratio of 25:75) was brought to the target range by adding the highest considered amount (2.0 wt%) of sodium chloride. The initial viscosity of sample 3 was within the target viscosity range and no viscosity adjustment was required.

[0080] The viscosity of comparative samples C3, C4, and C5 (total surfactant content 4 wt%; betaine:taurine ratios of 25:75, 50:50, and 75:25, respectively) was not brought to the target range by adding the highest considered amount of sodium chloride (2.0 wt%). The viscosity of samples 1 and 2 (cleaning surfactant content 8.25 wt%, betaine:taurine ratio 50:50) was brought to the target range by adding 0.7 wt% sodium chloride. The initial viscosity of sample 3 (cleaning surfactant content 8.25 wt%, betaine:taurine ratio 75:25) was within the target range and no adjustment was required.

[0081] Sample C1 had a significantly lower initial viscosity (3240 cPs) than Sample 3 (initial viscosity 4741 cPs), and contained a similar amount of cleaning surfactant (8.25%) and a similar betaine:taurine ratio (75:25) before salt adjustment; the presence of TAS in Sample 3 showed an increase in composition viscosity. Salt addition did not bring the adjusted viscosity of Sample C1 within the target range; with 1.0 wt% added salt, the adjusted viscosity of the C1 composition was lower than the initial viscosity. Sample C2 had a significantly lower initial viscosity (6128 cPs) than Sample 4 (initial viscosity 10280 cPs), and contained a similar amount of surfactant and a similar betaine:taurine ratio (75:25); the presence of TAS in Sample 4 showed an increase in composition viscosity.

[0082] The foaming properties of Sample 3, as well as the viscosity-modifying compositions of Samples 1 to 2, 4 to 6, and C3 to C6, are reported in Table 2B. The foaming properties were obtained by the following general procedure.

[0083] Foam volume measurements were obtained using the Sitafoam R-2000 Foam Tester (Sita FoamSoftware D / DAC; version 1.0.11.549) from SITA Lab Solutions. The tester's water reservoir was filled with water at a temperature of 40–42°C. The test settings were adjusted to 40 stirring cycles, 20 seconds per cycle, at 1000 rpm with 250 ml of water. A 1 g sample of the test composition was introduced into the tester, and the foam volume was measured under the described settings. The foam volume produced by the sample is reported in ml.

[0084] Foam density and stability are measured using the following procedure: Tare the graduated cylinder by weighing it on a balance.

[0085] At 45°C, 200 ml of tap water was measured into a Braun kitchen blender, and 2 ml of the test composition was added.

[0086] Use a timer, use the "pulse" switch for 10 seconds, and release the switch without stopping the timer, pausing the pulse for 10 seconds.

[0087] Repeat the 10-second pulse / 10-second pause cycle until 70 seconds have elapsed (a total of three and a half cycles).

[0088] Transfer the resulting foam into a graduated cylinder until the level reaches the 100 ml mark.

[0089] Record the weight of the foam, as shown on the balance (density).

[0090] Start the timer for 5 minutes and record the volume of liquid at the bottom of the graduated cylinder (stability).

[0091] Table 2B

[0092] Overall, all tested samples exhibited acceptable foam properties, with samples 3 to 5 providing the highest foam volume.

[0093] The composition of Sample 3 was subjected to a Salon test (by a team of 50 trained specialists). In this test, the composition of Sample 3 was perceived to have good cleaning properties.

[0094] Example 3 The compositions described in Table 3 were prepared using the general procedure described above, and their initial viscosity was measured. The indicated amount of viscosity modifier was then added to the initially formed composition, and the viscosity of the final composition was measured. The final composition was stored at 45°C for 2 months, and its viscosity was measured again. The viscosity was measured using the apparatus and conditions described above.

[0095] Table 3

[0096] Tego Betain CK KB5, from Evonik Industries; ≈30% cocamidopropyl betaine Pureact WS Conc., from Innospec Performance Chemicals; ≈30% Sodium Methyl Cocoyl Taurate After 2 months at 45°C, the final compositions of samples 7 to 12 were all within 15% of their fresh viscosity, and after storage, the final compositions of samples 9, 10 and 11 were all within 1% of their fresh viscosity.

[0097] Example 4 The compositions described in Tables 4, 5 and 6 below are prepared by the following procedures (variations of the general procedures described above).

[0098] Store approximately 10 to 15% of the initial water. Add polyquaternium-10 to the remaining initial water and begin heating to the target temperature of 60°C to 65°C (70°C if stearamidopropyl dimethylamine is to be added). Once polyquaternium-10 is completely dissolved, add sodium cocoyl taurate (Pureact WS Conc.) and mix until dissolved; if for use, add stearamidopropyl dimethylamine and mix until dissolved. Begin cooling to 30°C. During the cooling period, add cocoamidopropyl betaine (Tego® Betain CK KB5) and mix until dissolved. Add disodium EDTA and sodium benzoate pre-dispersed in the stored water (warmed to 40–60°C). If present in the formulation, add palmitamidopropyl trimethylammonium chloride (Varisoft® PATC) and mix until completely dispersed. When the mixture was cooled to below 35°C, the flavoring agent was added, and the pH was adjusted to 4.2-4.8 by adding citric acid, followed by the addition of sodium chloride (as indicated). The viscosity of the resulting composition was measured using a Discovery Mixture Rheometer (DHR-2 type) from TA Instruments (30°C, 4 tbsp, blasting plate). The viscosity of the compositions is reported in Tables 4 and 6 below. Samples C8, C9, C10, 12, 13, 14, 15, 16, 17, 18, C11, 19, C12, 20, and 21 in Table 4 correspond to samples A(1), B(1), B(2), K(1), K(4), O(1), Q(1), X(1), X(2), X(4), Y(1), Z(1), Y(5), BB(3), and BB(4) in Table 6, respectively.

[0099] Light transmittance through the composition was measured using the Formulaction Turbiscan LAB (which employs static multiple light scattering). ΔT > -20% (compared to distilled water samples) is considered "transparent" in this paper.

[0100] Table 4

[0101] Tego® Betain CK KB5, from Evonik Industries; ≈30% cocamidopropyl betaine Pureact WS Conc., from Innospec Performance Chemicals; ≈30% Sodium Methyl Cocoyl Taurate Varisoft® PATC, from Evonik Industries; ≈60% Palmitamide Propyltrimethylammonium Chloride Table 4 - Continued

[0102] Tego® Betain CK KB5, from Evonik Industries; ≈30% cocamidopropyl betaine Pureact WS Conc., from Innospec Performance Chemicals; ≈30% Sodium Methyl Cocoyl Taurate Varisoft® PATC, from Evonik Industries; ≈60% Palmitamide Propyltrimethylammonium Chloride Table 5

[0103] Tego® Betain CK KB5, from Evonik Industries; ≈30% cocamidopropyl betaine Pureact WS Conc., from Innospec Performance Chemicals; ≈30% Sodium Methyl Cocoyl Taurate Varisoft® PATC, from Evonik Industries; ≈60% Palmitamide Propyltrimethylammonium Table 6

[0104] Table 6 - Continued

[0105] Table 6 - Continued

[0106] Table 6 - Continued

[0107] Table 6 - Continued

[0108] Table 6 - Continued

[0109] Table 6 - Continued

[0110] Table 6 - Continued

[0111] The data in Tables 4 and 6 confirm the effect of formulation on transparency and viscosity. Samples C8, C9, and C10 were all transparent compositions but lacked acceptable viscosity. Samples 12, 14, and 15 (total cleaning surfactant content of 8 to 10% by weight) were all transparent compositions with viscosities ranging from 1897 cP to 8480 cP. All samples with a surfactant content of 12% by weight were opaque rather than transparent.

Claims

1. A personal hygiene composition comprising: a) Cationic surfactants that contain quaternary ammonium compounds and / or amide amines, b) Greater than 6% to at most 10% by weight of cleaning surfactants, and c) Water, The composition wherein the composition has an isotropic surfactant phase, and wherein: The cleaning surfactant contains 85 to 100% by weight of a combination of betaine surfactant and taurine surfactant, wherein: When the composition contains more than 6% by weight to up to 10% by weight of a cleaning surfactant, the weight ratio of betaine surfactant to taurine surfactant is 80:20 to 40:

60. The composition further comprises an electrolyte; The personal care composition described herein is substantially free of cationic derivatives of guar gum; The composition is substantially free of (meth)acrylate polymers and copolymers. The composition is substantially free of sulfate surfactants.

2. The personal hygiene composition of claim 1, wherein the quaternary ammonium compound comprises one to three long-chain alkyl groups having inter-ester, ether, or amide chains linked together, wherein the alkyl groups are saturated or unsaturated.

3. The personal care composition according to any one of the preceding claims, wherein the quaternary ammonium compound comprises a monoalkyl and / or dialkyl quaternary ammonium compound.

4. The personal care composition according to any one of the preceding claims, wherein the betaine surfactant is amide betaine and the taurine surfactant is acyl taurine.

5. The personal care composition according to any one of the preceding claims, wherein the betaine surfactant comprises cocamidopropyl betaine, and the taurine surfactant comprises sodium methylcocoyl taurate.

6. The personal hygiene composition according to any one of the preceding claims, wherein it is transparent.

7. The personal cleaning composition according to any one of the preceding claims, having a pH of 4 to 6.

8. A method for adjusting the viscosity of a composition, the method comprising the following steps: I) Provide the composition according to any one of claims 1 to 7; and II) Add an electrolyte to the composition. The addition of the electrolyte increases the viscosity of the resulting composition.

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