Hair Treatment Compositions and Methods

Abstract

i) an alpha olefin sulfonate anionic surfactant of general formula (I), wherein R 1 is selected from linear or branched alkyl groups having 11 to 13 carbon atoms and mixtures thereof, and M is a solubilizing cation; (ii) alkyl betaines of general formula (II): 2 is derived from C12 (lauryl), cocamidopropyl or coco.], alkylhydroxysultaine of general formula (III) [wherein R 3 is derived from C12 (lauryl) or coco.], alkylaminopropylhydroxysultaine of general formula (IV) [wherein R 4 = C12 (lauryl) or derived from coco.], alkylamphoacetates of general formula (V) [wherein R 5 is derived from C12 (lauryl) or coco; and an amphoteric or zwitterionic surfactant selected from the group consisting of piroctone compounds, wherein the weight ratio of alpha olefin sulfonate anionic surfactant (i) to amphoteric or zwitterionic surfactant (ii) is in the range of 1:1 to 6:1.

Description

[Technical Field]

[0001] The present invention relates to hair treatment compositions, and in particular to anti-dandruff shampoo compositions. [Background technology]

[0002] Dandruff is a problem affecting many people worldwide. The condition manifests itself as the shedding of dead skin cells from the scalp, which are white and aesthetically unpleasing. Dandruff is caused by certain members of the Malassezia genus of yeast. To combat these yeasts, hair treatment compositions containing various actives with anti-dandruff properties have been developed. Piroctone compounds, such as piroctone olamine, are one such active.

[0003] A common problem with piroctone compounds is minimal deposition of the active agent on the desired surface during the wash process. The desired surface is typically the scalp and / or hair. For example, piroctone compounds such as piroctone olamine are typically soluble in the surfactants in the cleansing phase of hair treatment compositions. If excessive rinsing is performed, most of the piroctone is likely to be washed away along with the surfactant. Since insufficient deposition correlates with low anti-dandruff activity, the adverse effects of dandruff are barely alleviated. To date, attempts have been made to offset this drawback by increasing the level of piroctone olamine in hair treatment compositions. This approach poses various problems, including increased cost, potential instability of the formulation, and potential adverse effects on hair perception. Therefore, it is not an approach favored by the industry.

[0004] DE 102012203240 A1 describes a hair treatment composition that enhances anti-dandruff effects and improves hair combability, shine, and elasticity. The composition contains an anti-dandruff agent selected from zinc pyrithione, climbazole, octopirox, ketoconazole, selenium disulfide, selenium-containing plant oils, selenium-containing plant extracts, and cationic aminosilicones. Examples include shampoos and conditioners containing Octopirox® (piroctone olamine), aminosilicones, and surfactants.

[0005] US2013 / 0059929A1 describes cosmetic or dermatological preparations that contain at least one of benzethonium chloride, methylisothiazolinone, piroctone olamine, and lauroyl ethyl arginate and are free of preservatives containing phenolic groups. These preparations exhibit improved sensory properties and sufficient microbiological stability.

[0006] US2002 / 0035161A1 describes a cosmetic / pharmaceutical oil-in-water emulsion comprising a discontinuous fatty phase dispersed in a continuous aqueous phase, and comprising an effective amount of at least one bioactive agent (A) and an effective amount of an emulsifying system (B), so that said at least one bioactive agent (A) is not dissolved therein in particulate form, numerically at least 80% of said particulates having a diameter in the range of 1 to 10 μm and numerically at least 50% having a diameter less than 5 μm. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] DE102012203240A1 [Patent Document 2] US2013 / 0059929A1 [Patent Document 3] US2002 / 0035161A1 Summary of the Invention [Problem to be solved by the invention]

[0008] Despite all the prior art, there remains a need to improve the deposition of piroctone compounds, particularly piroctonic acid or piroctone olamine, onto the scalp and / or hair surface during the cleansing process. There also remains a further need to improve said deposition onto said surface without adversely affecting sensory, formulation rheology, and conditioning performance. [Means for solving the problem]

[0009] The present invention provides i) Alpha olefin sulfonate anionic surfactants of general formula (I): [ka] [In the formula, R 1 is selected from linear or branched alkyl groups having 11 to 13 carbon atoms and mixtures thereof, and M is a solubilizing cation; (ii) Alkylbetaines of general formula (II): [ka] [In the formula, R 2 is derived from C12 (lauryl), cocamidopropyl or coco. Alkylhydroxysultaines of general formula (III): [ka] [In the formula, R 3 is derived from C12 (lauryl) or coco. Alkylaminopropylhydroxysultaines of general formula (IV): [ka] [In the formula, R 4 = C12 (lauryl) or derived from coco. Alkylamphoacetates of general formula (V): [ka] [In the formula, R 5 is derived from C12 (lauryl) or coco.] and mixtures thereof amphoteric or zwitterionic surfactants selected from: iii) Piroctone compounds Including, The present invention relates to a sulfate-free cleansing composition for hair and scalp, wherein the weight ratio of alpha olefin sulfonate anionic surfactant (i) to amphoteric or zwitterionic surfactant (ii) is in the range of 1:1 to 6:1.

[0010] The present invention also relates to a method of non-therapeutic treatment of hair or scalp, comprising applying the personal care composition described above.

[0011] Further, the above composition is described for use in treating the hair or scalp.

[0012] For the avoidance of doubt, any feature of one aspect of the present invention may be utilized in any other aspect of the present invention. Any feature described as "preferred" should be understood to be particularly preferred in combination with a further preferred feature or features. Any feature of a particular embodiment herein may be utilized in any other embodiment of the present invention. The examples provided in the following description are intended to clarify the present invention, but are not intended to limit it. All percentages are by weight unless otherwise stated. DETAILED DESCRIPTION OF THE INVENTION

[0013] "Aqueous continuous phase" means a continuous phase that is based on water.

[0014] In the context of the present invention, sulfate-free means that sulfate surfactants comprise less than 0.1%, preferably less than 0.05% by weight of the total composition.

[0015] Suitably, the composition of the present invention contains about 60 to about 95%, preferably 65 to 95%, more preferably 70 to 90% water (by weight based on the total weight of the composition).

[0016] Preferably, the composition comprises an isotropic surfactant phase, and under dilution, the isotropic micelles provide higher availability of monomers to the air / water interface, while the anisotropy can result in slower diffusion and therefore poorer flash foam properties. Thus, the isotropic phase is advantageous for product appearance, clarity, and good flash foam properties.

[0017] All amounts referred to herein are based on 100% activity (or "active") unless otherwise specified. 100% activity (or "active") means that the material is undiluted and is 100% by volume or weight. Many materials used in personal care formulations are commercially available at different active concentrations, e.g., 70% active or 60% active. For example, 100 mL of 70% active surfactant provides the same amount of active material as 70 mL of 100% active surfactant. Therefore, to vary the activity of a material, all amounts shall be based on 100% active material.

[0018] The aqueous continuous phase comprises a total amount of anionic, amphoteric, and zwitterionic surfactants consisting of (i) and (ii) below. That is, no additional anionic, amphoteric, or zwitterionic surfactants are present in the composition of the present invention. Preferably, no other surfactants, such as nonionic surfactants, are present in the composition of the present invention.

[0019] (i) α-olefin sulfonate anionic surfactants The composition of the present invention contains (i) one or more α-olefin sulfonate-based anionic surfactants represented by general formula (I). [ka]

[0020] In the formula, R 1 is selected from linear or branched alkyl groups having 11 to 13 carbon atoms and mixtures thereof, and M is a solubilizing cation; Preferably, R in general formula (I) 1 is C 14 or C 16 It is a straight chain alkyl group. Preferably, R in general formula (I) 1 is a C11 or C13 straight chain alkyl group.

[0021] Preferably, M in general formula (I) is selected from alkali metal cations (eg, sodium or potassium), ammonium cations and substituted ammonium cations (eg, alkylammonium, alkanolammonium or gluconammonium).

[0022] Commercially available alpha olefin sulfonate anionic surfactants of general formula (I) can be produced by treating natural gas-derived C14-16 olefins with sulfuric acid. This process can also produce a mixture of homologues and low levels of unreacted olefins.

[0023] Particularly preferred are α-olefin sulfonates having an average carbon number of 14 to 16. A suitable example of such a material is Bioterge AS40 (eg Stepan).

[0024] The amount of 100% active alpha olefin sulfonate anionic surfactant of general formula (I) ranges from 3 to 13%, preferably from 3.5 to 12%, more preferably from 3 to 10% (by weight based on the total weight of the composition).

[0025] (ii) Amphoteric or zwitterionic surfactants of general formula (II), (III), (IV) or (V) The compositions of the present invention comprise (ii) an amphoteric or zwitterionic surfactant selected from alkyl betaines of the following general formula (II): [ka]

[0026] [In the formula, R 2 is derived from C12 (lauryl), cocamidopropyl or coconut. Alkylhydroxysultaines of the following general formula (III): [ka]

[0027] [In the formula, R 3 is derived from C12 (lauryl) or coconut. Alkylaminopropylhydroxysultaine of the following general formula (IV): [ka]

[0028] [In the formula, R 4 is derived from C12 (lauryl) or coconut. An alkylamphoacetate salt of the following general formula (V): [ka]

[0029] [In the formula, R 5 is derived from C12 (lauryl) or coconut. and A mixture of them Includes.

[0030] Preferably, R 2 is derived from C12 (lauryl) or coconut.

[0031] Preferred surfactants (ii) are selected from cocobetaine, cocoamidopropyl betaine, lauryl hydroxysultaine, cocoaminopropyl hydroxysultaine, lauryl amphoacetate and mixtures thereof, most preferably cocobetaine, cocoamidopropyl betaine, lauryl hydroxysultaine and mixtures thereof. Alkyl hydroxysultaines are preferred, especially lauryl hydroxysultaine.

[0032] The amount of amphoteric or zwitterionic surfactant of general formula (II), (III), (IV) or (V) or mixtures thereof preferably ranges from 1 to 6%, more preferably from 1.5 to 5%, and most preferably from 2 to 3.5% (total weight of the composition and on a 100% active basis).

[0033] In more preferred compositions, the amphoteric or zwitterionic surfactant (ii) comprises a betaine amphoteric surfactant of general formula (II) which is cocobetaine or cocamidopropyl betaine; an amphoteric surfactant of general formula (III) which is lauryl hydroxysultaine; and mixtures thereof, in an amount of 1 to 4% (weight based on total weight of the composition and 100% actives).

[0034] The combined amount of (i) and (ii) preferably ranges from 4 to 20% by weight, preferably from 5 to 17% by weight, most preferably from 8 to 15% by weight (total weight of the composition and 100% active basis).

[0035] Particularly preferred compositions according to the present invention comprise (i) an alpha olefin sulfonate in the range of 3.25 to 8% (by weight based on the total weight of the composition and 100% active substances) and (ii) an amphoteric or zwitterionic surfactant selected from cocobetaine, cocamidopropyl betaine, lauryl hydroxysultaine, cocoaminopropyl hydroxysultaine, lauryl amphoacetate or mixtures thereof in the range of 1 to 4% (by weight based on the total weight of the composition and 100% active substances).

[0036] The weight ratio of the alpha olefin sulfonate anionic surfactant (i) to the amphoteric surfactant (ii) is 1:1-6:1, preferably 1.5:1-5.

[0037] Preferably, the pH of the composition of the present invention is in the range of 3-6.5, preferably 3.5-5.1, more preferably 4-5.

[0038] A protonating agent may be used to achieve a low pH. A suitable protonating agent is an acid. Suitable acids useful herein include hydrochloric acid, citric acid, acetic acid, tartaric acid, fumaric acid, lactic acid, malic acid, succinic acid, and mixtures thereof. Preferably, the acid is selected from the group consisting of citric acid, acetic acid, tartaric acid, hydrochloric acid, fumaric acid, lactic acid, and mixtures thereof.

[0039] Piroctone compounds for use in the present invention include piroctonic acid, primary, secondary, and tertiary olamine salts of piroctonic acid (such as the diethanolamine and triethanolamine salts), and mixtures thereof, preferably piroctonic acid, the primary olamine salt of piroctonic acid (i.e., piroctone olamine, also known as Octirox®), and mixtures thereof.

[0040] Piroctone olamine is the olamine salt of the hydroxamic acid derivative piroctone. It is commonly known as piroctone ethanolamine under the trade name Octirox®.

[0041] Piroctone olamine according to the present invention is a 1:1 compound of 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)-pyridinone and 2-aminoethanol, also known as 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)pyridinone monoethanolamine salt, CAS number 68890-66-4, and the compound has the following general formula (I): [ka]

[0042] The piroctone compound, particularly piroctone olamine, is preferably present at 0.01 to 5% by weight of the total composition, more preferably 0.1 to 5% by weight, most preferably 0.2 to 3% by weight.

[0043] The personal care composition can include at least one cationic deposition polymer.

[0044] The cationic deposition polymer contains dimethyldiallylammonium moieties.

[0045] Preferred cationic polymers are homo- or copolymers in which a dimethyldiallylammonium moiety is one of the monomers. More preferred cationic polymers are Polyquaternium-6, Polyquaternium-7, and Polyquaternium-22. An especially preferred cationic polymer is Polyquaternium-6.

[0046] Typically, the cationic polymer is present at a level of from 0.01 to 5%, preferably from 0.05 to 2%, more preferably from 0.1 to 1% by weight of the total composition.

[0047] Additional cationic deposition polymers may be included, but are not preferred.

[0048] Other cationic polymers include polygalactomannans and polysaccharide polymers such as cationic cellulose derivatives and cationic starch derivatives.

[0049] Mixtures of any of the above cationic polymers can be used.

[0050] Preferably, the weight ratio of cationic polymer to total surfactant, preferably olefin sulfonate anionic surfactant (i) and amphoteric or zwitterionic surfactant (ii), is from 20:1 to 50:1, preferably from 25:1 to 40:1.

[0051] Preferably, the compositions of the present invention, particularly aqueous shampoo compositions for use in the present invention, further comprise a suspending agent. Suitable suspending agents are selected from polyacrylic acid, crosslinked polymers of acrylic acid, copolymers of acrylic acid and hydrophobic monomers, copolymers of carboxylic acid-containing monomers and acrylic esters, crosslinked copolymers of acrylic acid and acrylic esters, heteropolysaccharide gums, and crystalline long-chain acyl derivatives. The long-chain acyl derivatives are desirably selected from ethylene glycol stearate, alkanolamides of fatty acids having 16 to 22 carbon atoms, and mixtures thereof. Ethylene glycol distearate and polyethylene glycol 3 distearate are preferred long-chain acyl derivatives because they impart a pearlescent appearance to the composition. Polyacrylic acid is commercially available as Carbopol 420, Carbopol 488, or Carbopol 493. Polymers of acrylic acid crosslinked with polyfunctional agents can also be used; these are commercially available as Carbopol 910, Carbopol 934, Carbopol 941, and Carbopol 980. An example of a suitable copolymer of a carboxylic acid-containing monomer and an acrylic acid ester is Carbopol 1342. All Carbopol™ materials are available from Goodrich.

[0052] The suspending agent will normally be present in shampoo compositions for use in the present invention at a level of from 0.1 to 10%, preferably from 0.15 to 6%, more preferably from 0.2 to 4% total weight of suspending agent based on the total weight of the composition.

[0053] The cosmetic composition may optionally contain one or more ingredients, provided that these optional ingredients are physically and chemically compatible with the aforementioned essential ingredients and do not unduly impair the sensory evaluation, formulation rheology, and conditioning performance. The concentration of each of these optional ingredients may range from 0.001% to 10% by weight, preferably 0.01% to 5% by weight, of the total composition. Such ingredients may include conditioning agents, fragrances, dyes, pigments, pH adjusters, pearlescent agents or opacifiers, viscosity adjusters, preservatives, and natural hair nutrients such as botanicals, fruit extracts, sugar derivatives, and amino acids.

[0054] A preferred optional ingredient is a suspending agent. Suitable suspending agents are selected from polyacrylic acid, crosslinked polymers of acrylic acid, copolymers of acrylic acid and hydrophobic monomers, copolymers of carboxylic acid-containing monomers and acrylic esters, crosslinked copolymers of acrylic acid and acrylic esters, heteropolysaccharide gums, and crystalline long-chain acyl derivatives. The long-chain acyl derivative is preferably selected from ethylene glycol stearate, alkanolamides of fatty acids having 16 to 22 carbon atoms, and mixtures thereof. Ethylene glycol distearate and polyethylene glycol 3 distearate are preferred long-chain acyl derivatives because they impart a pearlescent appearance to the composition. Polyacrylic acid is commercially available as Carbopol 420, Carbopol 488, or Carbopol 493. Polymers of acrylic acid crosslinked with polyfunctional agents can also be used; these are commercially available as Carbopol 910, Carbopol 934, Carbopol 941, and Carbopol 980. An example of a suitable copolymer of a carboxylic acid-containing monomer and an acrylic acid ester is Carbopol 1342. All Carbopol™ materials are available from Goodrich. A suitable crosslinked polymer of acrylic acid and an acrylic acid ester is Pemulen TR1 or Pemulen TR2. A suitable heteropolysaccharide gum is xanthan gum, such as that available as Kelzan mu.

[0055] Mixtures of any of the above suspending agents may be used, with a preferred mixture being a crosslinked polymer of acrylic acid and a crystalline long chain acyl derivative.

[0056] The most preferred example is a cross-linked polyacrylate polymer.

[0057] If included, a suspending agent will generally be present in the composition at a level of from 0.01 to 5%, preferably from 0.1 to 2.5%, more preferably from 0.25 to 1% by weight.

[0058] Another preferred optional component is a conditioning agent that provides conditioning effect.Typically, the conditioning agent that is most commonly used in cosmetic compositions is water-insoluble oily substance such as mineral oil, natural oil such as triglyceride and silicone oil.Conditioning effect is achieved by depositing oily substance on hair to form a film, which increases hair moisture and reduces dryness.Preferably, conditioning agent is non-volatile, that is, its vapor pressure at 25 ℃ is less than 1000 Pa.

[0059] Preferably, the composition comprises discretely dispersed droplets of a water-insoluble conditioning agent having an average droplet size (D3,2) of less than 50 microns, preferably less than 30 microns, more preferably less than 15 microns, and most preferably less than 10 microns. The average droplet size (D3,2) of the water-insoluble conditioning agent can be measured by laser light scattering techniques, for example, using a Malvern Instruments 2600D particle size analyzer.

[0060] The water-insoluble conditioning agent may include a non-silicone conditioning agent, which comprises a non-silicone oily or fatty material such as hydrocarbon oils, fatty esters, and mixtures thereof. Preferably, the water-insoluble conditioning agent is an emulsified silicone oil.

[0061] Suitable silicones include polydiorganosiloxanes, particularly polydimethylsiloxanes with the CTFA designation dimethicone. Suitable for use in the compositions of the present invention (particularly shampoos and conditioners) are polydimethylsiloxanes with hydroxyl end groups that have the CTFA designation dimethiconol. Also suitable for use in the compositions of the present invention are silicone gums with slight crosslinking, such as those described in WO 96 / 31188. Preferably, the silicone oil comprises dimethicone, dimethiconol, or a mixture thereof.

[0062] The viscosity of the emulsified silicone itself (not the emulsion or the final hair care composition) is typically at least 10,000 cSt (centistokes = mm) at 25°C. 2 ··S -1 ), preferably at least 60,000 cSt, most preferably at least 500,000 cSt, and ideally at least 1,000,000 cSt. Preferably, for ease of formulation, the viscosity is 10 9 The kinematic viscosity of silicone oils is not more than 1000 kJ / cm². Suitable methods for measuring the kinematic viscosity of silicone oils are known to those skilled in the art and include, for example, a capillary viscometer. For high viscosity silicones, a constant stress rheometer can be used to measure the viscosity.

[0063] The emulsified silicone suitable for use in this composition can be obtained as preformed silicone emulsion from silicone suppliers such as Dow Corning and GE silicones.The use of such preformed silicone emulsion is preferred for ease of processing and control of silicone particle size.This preformed silicone emulsion typically further comprises a suitable emulsifier, and can be prepared by chemical emulsification process such as emulsion polymerization, or by mechanical emulsification using a high-shear mixer.

[0064] Examples of suitable pre-formed silicone emulsions include DC1785, DC1788, and DC7128, all available from Dow Corning, which are dimethiconol / dimethicone emulsions.

[0065] Another type of silicone that can be used is a functionalized silicone, such as an amino-functional silicone, which means a silicone containing at least one primary, secondary, tertiary amine group, or quaternary ammonium group. Examples of suitable amino-functional silicones include polysiloxanes having the CTFA designation "amodimethicone."

[0066] Preferably, the silicone emulsion is formed by mixing with certain types of high molecular weight surface-active block polymers, as described, for example, in WO 03 / 094874. One preferred form of surface-active block polymer having polyoxypropylene groups as the hydrophobic portion and polyoxyethylene groups as the hydrophilic portion has formula V, has the CTFA name Poloxamer, and is commercially known from BASF under the trade name "Pluronic." [ka]

[0067] Suitably, the average value of x in formula I is 4 or greater, preferably 8 or greater, more preferably 25 or greater, even more preferably 50 or greater, and most preferably 80 or greater. The average value of x is typically 200 or less. Suitably, the average value of y is 25 or greater, preferably 35 or greater, more preferably 45 or greater, and most preferably 60 or greater. The average value of y is typically 100 or less.

[0068] Another preferred form of surface-active block polymer is according to formula VI and has the CTFA name poloxamine, which is commercially available from BASF under the trade name "Tetronic". [ka]

[0069] Suitably, the average value of a is 2 or more, preferably 4 or more, more preferably 8 or more, even more preferably 25 or more, and most preferably 40 or more. The average value of a is typically 200 or less. The average value of b is suitably 6 or more, preferably 9 or more, more preferably 11 or more, and most preferably 15 or more. The average value of b is typically 50 or less.

[0070] Preferably, the surface active block polymer is a poloxamer and / or a poloxamine, more preferably the surface active block polymer is a poloxamer.

[0071] Preferably, the surface-active block polymer is mixed with dimethicone in a weight ratio of dimethicone to surface-active block polymer in the blend ranging from 2:1 to 200:1, more preferably from 5:1 to 50:1, even more preferably from 10:1 to 40:1, and most preferably from 15:1 to 30:1.

[0072] The water-insoluble conditioning agent is generally present in the composition in an amount of from 0.05 to 15%, preferably from 0.1 to 10%, more preferably from 0.5 to 8%, and most preferably from 1 to 5%, by weight of the total composition (including all ranges subsumed therein).

[0073] The composition may preferably contain a pearlescent agent. A preferred pearlescent agent is an ethylene glycol ester as disclosed in U.S. Patent No. 4,885,107 (incorporated herein by reference). Preferably, the ethylene glycol ester is a glycol monoester or diester, more preferably a glycol diester.

[0074] Preferably, the ethylene glycol monoester or diester is C 12-22 Ethylene glycol monoesters or diesters of fatty acids, more preferably saturated C 12-22The pearlescent agent is an ethylene glycol monoester or diester of a fatty acid. The most preferred diesters include a mixture of palmitic acid ester and stearic acid ester. The amount of stearic acid ester should be in the range of about 10% to about 42%, or about 55% to about 80%, with the remainder being palmitic acid ester. The amount of stearic acid ester is preferably about 60% to about 75%, more preferably about 80% to about 95%, and most preferably 100%. The most suitable example of the pearlescent agent is ethylene glycol distearate. The pearlescent agent can also function as a suspending agent.

[0075] The content of the ethylene glycol ester is suitably about 0.5% by weight to about 6% by weight, and preferably about 1% by weight to about 4% by weight, based on the weight of the entire composition.

[0076] The viscosity of the composition is suitably in the range of 3,000 to 10,000 mPa·s, preferably 4,000 to 8,000 mPa·s, more preferably 5,000 to 7,000 mPa·s, when measured at 30°C using a Brookfield V2 viscometer (spindle RTV5, 1 min, 20 rpm).

[0077] Rinse-off compositions are intended to be rinsed off the user's scalp with water after use. Rinse-off compositions are preferred. Leave-on compositions are intended not to be rinsed off the user's scalp immediately after use (i.e., within at least the first two hours, preferably at least four hours, after application of the composition). In the context of the present invention, rinse-off compositions include shampoos and conditioners, as well as treatment compositions that can be left on the scalp for 0.5 minutes up to 15 minutes, preferably 1 minute to 10 minutes, more preferably 1 minute to 10 minutes, before rinsing.

[0078] A preferred application of the cosmetic composition is as a shampoo, particularly a rinse-off shampoo. The shampoo compositions used in the present invention are generally aqueous, i.e., based on water or an aqueous solution or a lyotropic liquid crystal phase. Suitably, the shampoo composition contains 50 to 98 wt. %, preferably 60 to 92 wt. %, of water, based on the total weight of the composition. Such compositions are said to have an aqueous base.

[0079] The invention is illustrated by the following non-limiting examples. [Example]

[0080] Compositions were prepared according to Tables 1 and 2.

[0081] Table 1 [Table 1]

[0082] Table 2 [Table 2]

[0083] Piroctone olamine deposition was measured on ten clean, dark brown European hair switches (2.5 g / 6 inches) thoroughly wetted with water. Five replicates were tested for each shampoo composition. 0.25 g of shampoo was applied to one switch and massaged for 30 seconds. The switch was then rinsed with water for 30 seconds. 0.25 g of shampoo was applied again and massaged for an additional 30 seconds. The shampoo was then rinsed with water for 30 seconds. The switch was allowed to air dry. The dried switch was extracted with 50 mL of ethanol. Care was taken to avoid exposing the extract to UV light. The extract was analyzed by UPLC for piroctonic acid deposition. The results are shown above in Tables 1 and 2.

[0084] The results demonstrate that the inventive examples are more effective at depositing piroctone olamine than the comparative examples.

Claims

1. i) Alpha olefin sulfonate anionic surfactants of general formula (I): 【Chemistry 1】 [In the formula, R １ is selected from linear or branched alkyl groups having 11 to 13 carbon atoms and mixtures thereof, and M is a solubilizing cation; (ii) Alkylbetaines of general formula (II): 【Chemistry 2】 [In the formula, R ２ is derived from C12 (lauryl), cocamidopropyl or coco. Alkylhydroxysultaines of general formula (III): 【Transformation 3】 [In the formula, R ３ is derived from C12 (lauryl) or coco. Alkylaminopropylhydroxysultaines of general formula (IV): 【Chemistry 4】 [In the formula, R ４ = C12 (lauryl) or derived from coco. Alkylamphoacetates of general formula (V): 【Transformation 5】 [In the formula, R ５ is derived from C12 (lauryl) or coco. and mixtures thereof an amphoteric or zwitterionic surfactant selected from: iii) Piroctone compounds Including, 1. A sulfate-free cleansing composition for hair and scalp, wherein the weight ratio of alpha olefin sulfonate anionic surfactant (i) to amphoteric or zwitterionic surfactant (ii) is in the range of 1:1 to 6:

1.

2. 2. The sulfate-free cleansing composition of claim 1, wherein the piroctone compound is piroctone olamine.

3. 10. A sulphate-free cleansing composition according to any one of the preceding claims, comprising a total level of piroctone compounds at a level of 0.1 to 5%, preferably 0.2 to 3% by weight of the total composition.

4. A sulfate-free cleansing composition according to any one of the preceding claims, further comprising a cationic deposition polymer, preferably polyquaternium-6.

5. 10. The sulfate-free cleansing composition of any preceding claim, wherein the weight ratio of alpha olefin sulfonate anionic surfactant (i) to amphoteric or zwitterionic surfactant (ii) is from 1.5:1 to 5:

1.

6. 5. The sulfate-free cleansing composition of claim 4, wherein the weight ratio of cationic polymer of claim 1 to total surfactants is from 20:1 to 50:1, preferably from 25:1 to 40:

1.

7. 10. The sulfate-free cleansing composition of any preceding claim, wherein the pH of the composition is from 3 to 6.

5.

8. 10. A sulphate-free cleansing composition according to any one of the preceding claims, wherein the total level of anionic surfactants i) and amphoteric and zwitterionic surfactants ii) is from 4 to 20%, preferably from 6 to 15%, more preferably from 7 to 13.5% by weight of the total composition.

9. 10. A sulfate-free cleansing composition according to any one of the preceding claims, wherein the amount of alpha olefin sulfonate anionic surfactant (i) is from 3 to 13% by weight of the total composition, preferably from 4 to 10% by weight.

10. 10. A sulphate-free cleansing composition according to any one of the preceding claims, wherein the amount of amphoteric or zwitterionic surfactant ii) is from 1.5 to 5% by weight of the total composition, preferably from 2 to 3.5%.

11. 10. A sulfate-free cleansing composition according to any one of the preceding claims, wherein the amphoteric or zwitterionic surfactant (ii) is an amphoteric surfactant of general formula (III), which is an alkyl hydroxysultaine, preferably lauryl hydroxysultaine.

12. 10. A sulfate-free cleansing composition according to any preceding claim, which is free of any cleansing surfactant not defined in claim 1.

13. 10. The sulfate-free cleansing composition of any preceding claim, which is free of thickening agents selected from thickening polymers and second surfactants not defined in (ii).

14. 10. A sulfate-free cleansing composition according to any preceding claim, further comprising 0.5 to 6.5 wt.% of a silicone conditioning agent, preferably a silicone emulsion.

15. A method for non-therapeutic treatment of hair and scalp, comprising applying to said hair and scalp a composition as defined in any one of claims 1 to 13.

16. A composition according to any one of claims 1 to 13 for use in alleviating dandruff.

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