COMPOSITION FOR HAIR TREATMENT

Abstract

A hair treatment composition comprising: i) a cleansing step comprising a surfactant, wherein at least 50% by weight of the total surfactant comprises an ethoxylated alkyl sulfate anionic surfactant; ii) an oil-in-water emulsion comprising a silicone; iii) a piroctone compound at a level of 0.15 to 1.5% by weight of the composition; and iv) a cationic polymer wherein the cationic polymer comprises a dimethyldiallylammonium portion, at a level of 0.1 to 1.0% by weight of the composition; wherein the anti-dandruff agent component in the composition is less than 50% by weight in solid form.

Description

COMPOSITION FOR HAIR TREATMENT FIELD OF INVENTION The present invention relates to a hair treatment composition, in particular an anti-dandruff shampoo composition. BACKGROUND OF THE INVENTION Dandruff is a problem that affects many people worldwide. The condition manifests as the shedding of clumps of dead skin cells from the scalp. These flakes are white and create an unsightly appearance. Certain members of the Malassezia yeast family contribute to dandruff. To combat this, hair treatment formulations are developed that include various active ingredients known for their anti-dandruff effectiveness. Piroctone compounds, such as piroctone olamine, are one such active ingredient. A common problem with piroctone compounds is their poor deposition on the hair or scalp during washing. This is particularly true when they are present in the composition of effective anionic cleansing surfactants such as sodium laureth sulfate. During excessive rinsing, most of the piroctone is likely to be washed away along with the surfactants. Poor deposition correlates with low anti-dandruff activity, so the harmful effects of dandruff are poorly mitigated. To date, attempts have been made to compensate for this drawback by increasing the level of piroctone olamine in hair treatment formulations. However, this approach leads to several problems, including higher costs, potential formulation instability, and potentially adverse effects on the hair's sensory properties. Therefore, it is not a favored approach within the industry. DE102012203240A1 describes a hair treatment composition with an enhanced anti-dandruff effect and improved hair manageability, shine, and elasticity. The composition includes an anti-dandruff agent selected from zinc pyrithione, Climbazole, Octopirox, Ketoconazole, selenium disulfide, selenium-containing vegetable oil, selenium-containing plant extract, and a cationic aminosilicone. Examples include shampoos and conditioners containing Octopirox® (Piroctone Olamine), aminosilicone, and surfactants. US2013 / 0059929A1 describes a cosmetic or dermatological preparation comprising at least one of benzethonium chloride, methylisothiazolinone, piroctone olamine, and lauroylethylarginate, and does not contain preservatives comprising a phenolic group. The preparations exhibit enhanced sensory properties and sufficient microbiological stability. EP0941061 describes a hair shampoo comprising: surfactant, polyethyleneimine, and piroctone olamine. The presence of polyethyleneimine in the composition is said to enhance the deposition of the active piroctone olamine onto the hair and skin. It is alleged that various commercial products sold under the brands “Ultra Doux” and “Nak” in China between 2016 and 2019 contain, among other ingredients, lauryl ether sulfate surfactant, betaine surfactant, piroctone olamine, polyquaternium-6, and amodimethicone. However, particularly in the case of the Nak product, it is unclear whether the commercial availability of the product predetermines the priority date of this application. RCRnnn / zznz / E / YiAi patent. The listing or discussion of a document apparently previously published in this specification should not necessarily be taken as an acknowledgment that the document is part of the prior art or is common knowledge. Despite the previous technique, there remains a need to improve the deposition of piroctone compounds, especially piroctone acid or piroctone olamine, onto the scalp and / or hair surface during the washing process. There is also a further need to improve deposition onto the hair and / or scalp without adversely affecting cleaning and conditioning performance. The present invention addresses one or more of the needs described above. BRIEF DESCRIPTION OF THE INVENTION In a first aspect of the present invention, a hair treatment composition is provided comprising: i) a cleaning step comprising a surfactant, wherein at least 50% by weight of the total surfactant comprises an ethoxylated alkyl sulfate anionic surfactant; i) an oil-in-water emulsion comprising a silicone; iii) a piroctone compound; and iv) a cationic polymer in which the cationic polymer comprises a portion of dimethyldiallylammonium. In a second aspect of the present invention, a non-therapeutic method for treating hair or scalp is provided, comprising applying the hair treatment composition as described above to the hair or scalp. In the context of the present invention, the term “anti-dandruff activity” should be understood as the effect of preventing, controlling, reducing or limiting human dandruff. The term “hair treatment composition” should be understood as a composition for topical application to the hair and / or scalp of mammals, preferably humans. Such a composition may be in the form of a liquid, lotion, cream, foam, scrub, gel, or bar. Non-limiting examples of such compositions include lotions, creams, shampoos, serums, or hair conditioners. Ideally, the hair treatment composition is an anti-dandruff shampoo. DETAILED DESCRIPTION OF THE INVENTION Any feature stated as “preferred” in one aspect of the invention should be understood as a preferred feature in the other aspect of the invention. Any feature described as “preferred” should be understood as particularly preferred in combination with another preferred feature or features. Any feature of a particular embodiment of the present invention may be used and shall be considered as described in combination with any other embodiment of the invention. All weight percentages (% by weight) are based on the final weight of the composition unless otherwise stated. Numerical variations expressed in the format “xy” should be understood as RCRnnn / zznz / E / YiAi includes xey, unless otherwise specified. Numbers may be qualified by the term “approximately”. When multiple preferred variations are described for a specific feature in the format “xay”, it should be understood that all variations combining the different endpoints are also included. Composition for hair treatment The preferred composition comprises a cosmetically acceptable carrier. "Cosmetically acceptable carrier" means a carrier that is compatible with hair, skin, implants, or mucous membranes without causing any unacceptable discomfort that might discourage the consumer from using the composition. The preferred carrier is water. The preferred formulation is an anti-dandruff shampoo. The anti-dandruff shampoo can adequately comprise 50-90%, preferably 60-80%, water by weight of the total shampoo. Cleaning phase The cleansing phase comprises one or more cleansing surfactants. Cleansing surfactants are those that act to cleanse the hair and / or scalp. The preferred total level of cleansing surfactants is 3 to 45%, the more preferred 5 to 25%, and the even more preferred 7 to 20% by weight of the total composition. Preferably, the cleaning surfactant comprises an anionic surfactant. The anionic surfactant comprises an ethoxylated alkyl sulfate anionic surfactant. The preferred alkyl ether sulfates are those of formula (I): RO-(CH2CH2-O)n-SO3M+(I) wherein R is a linear or branched alkyl chain having 8 to 18 (preferably 12 to 18) carbon atoms; n is the average degree of ethoxylation and ranges from 0.5 to 3 (preferably 1 to 3); and M is a solubilizing cation such as sodium, potassium, ammonium, or substituted ammonium. An example is sodium lauryl ether sulfate (SLES). The most preferred example is SLES having an average degree of ethoxylation of 0.5 to 3, preferably 1 to 3. The preferred level of said surfactant is 2 to 20% by weight of the total composition, with 8 to 15% by weight being the most preferred. Other surfactants that may be present in the composition include alkyl sulfates. The preferred alkyl sulfates are Cs-ts alkyl sulfates, and more preferably C12-18 alkyl sulfates, preferably in the form of a salt with a solubilizing cation such as sodium, potassium, ammonium, or substituted ammonium. Examples include sodium lauryl sulfate (SLS) and sodium dodecyl sulfate (SDS). The cleansing phase may include one or more additional anionic surfactants that are cosmetically acceptable and suitable for topical application to the hair and / or scalp. Examples of additional anionic surfactants include alkylsulfonates, alkylsuccinates, alkylsulfosuccinates, alkyl ether sulfosuccinates, N-alkylsarcosinates, alkyl phosphates, alkyl ether phosphates, and alkyl ether carboxylic acids and salts thereof, particularly their sodium, magnesium, ammonium, and mono-, di-, and triethanolamine salts. Alkyl ether sulfosuccinates, alkyl ether phosphates, and alkyl ether carboxylic acids and salts thereof may contain from 1 to 20 ethylene oxide or propylene oxide units per molecule. Typical anionic cleaning surfactants for use in shampoo compositions according to RCRnnn / zznz / E / YiAi The present invention includes sodium oleylsuccinate, ammonium laurylsulfosuccinate, sodium laureth sulfate, sodium dodecylbenzenesulfonate, triethanolamine dodecylbenzenesulfonate, lauryl carboxylic acid and sodium N-laurylsarcosinate, sodium lauryl sulfate monoglyceride, sodium lauryl sulfate, sodium laureth sulfate, sodium co-co-co-co-co-isothione and mixtures thereof. The composition may include co-surfactants to help impart aesthetic, physical, or cleansing properties. The preferred co-surfactant is included in the cleansing phase of the composition. An example of a co-surfactant is a non-ionic surfactant, which may be included in an amount ranging from 0.5 to 10%, preferably 2 to 8%, and most preferably 1 to 5% by weight of the total composition. For example, representative nonionic surfactants that can be included in the treatment compositions, preferably the shampoo compositions of the invention, include condensation products of primary or secondary linear or branched aliphatic alcohols or phenols (Ce-Cie) with alkylene oxides, typically ethylene oxide, and generally having from 6 to 30 ethylene oxide groups. Other representative nonionic surfactants include mono- or di-alkylalkanolamides. Examples include coco-mono- or di-ethanolamide and coco-mono-isopropanolamide. Additional nonionic surfactants that may be included are alkyl polyglycosides (APGs). Typically, an APG comprises an alkyl group connected (optionally via a bridging group) to a block of one or more glucosyl groups. Preferred APGs are defined by the following formula (II): R'O-(G)k(II) wherein R' is a linear or branched alkyl group, which may be saturated or unsaturated, and G is a saccharide group. R' may represent an average alkyl chain length from approximately Cs to approximately C20. Preferably, R' represents an average alkyl chain length from approximately Cs to approximately C12. Most preferably, the value of R' is between approximately 9.5 and approximately 10.5. G may be selected from Cs or Cs monosaccharide residues and is preferably a glucoside. G may be selected from the group comprising glucose, xylose, lactose, fructose, mannose, and derivatives thereof. Preferably, G is glucose. The degree of polymerization, k, may have a value from approximately 1 to approximately 10 or more; preferably, the value of k is between approximately 1.1 and approximately 2. For the most preferred option, the value of m is between approximately 1.3 and approximately 1.5.The alkylpolyglycosides suitable for use in the invention are commercially available and include, for example, those materials identified as: Oramix NS10 e.g. Seppic; Plantaren 1200 and Plantaren 2000 e.g. Henkel. Other sugar-derived nonionic surfactants that may be included in the compositions (preferably shampoos) of the invention include C10-C18 N-alkyl(C1-C6) polyhydroxyamides of fatty acids, such as C12-C18 N-methylglucamides, as described, for example, in WO 92 / 06154 and US 5,194,639, and N-alkoxypolyhydroxyamides of fatty acids, such as C10-C18 N-(3-methoxypropylglucamide). A preferred example of a co-active is an amphoteric or zwitterionic surfactant, which can be included in an amount ranging from 0.5 to approximately 10% by weight, preferably between 2 and 10%. RC«nnn / 77nz / E / YiAi 8, with the highest preference between 1 and 5% by weight of the total composition. Examples of amphoteric or zwitterionic surfactants include alkylamine oxides, alkylbetaines, alkylamidopropylbetaines, alkylsulfobetaines (sultaines), alkylglycinates, alkylcarboxyglycinates, alkylamphoacetates, alkylamphopropionates, alkylamphoglycinates, alkylamidopropyl hydroxysultaines, acyltaurates, and acylglutamates, in which the alkyl and acyl groups have from 8 to 22 carbon atoms. Typical amphoteric and zwitterionic surfactants for use in shampoos of the invention include laurylamine oxide, cocodimethylsulfopropylbetaine, laurylbetaine, cocamidopropylbetaine, and sodium cocoamphoacetate. A particularly preferred amphoteric or zwitterionic surfactant is an amidobetaine amphoteric surfactant of general formula (III): OR, III R1---C---NH(CH2)m---N---CH2CO2'R3(III) wherein m is 2 or 3; R1C(O) is selected from linear or branched, saturated or unsaturated acyl groups having 8 to 22 carbon atoms and mixtures thereof; and R2 and R3 are each independently selected from alkyl, hydroxyalkyl, or carboxyalkyl groups having 1 to 6 carbon atoms and mixtures thereof. An example is cocamidopropyl betaine. The preferred level of said surfactant is 0.5-10% by weight of the total composition, more preferably 2-8% by weight, and more preferably 1-5% by weight. Another optional but preferred surfactant is an alkyl glycinate and / or alkyl carboxyglycinate. If present, it is at a level of 1 to 8% by weight, preferably 2 to 6% by weight. Preferably, the alkylglycinate and / or alkylcarboxyglycinate has an alkyl group of C8-22 carbon atoms, in the form of a salt with a solubilizing cation such as sodium, potassium, ammonium, or substituted ammonium. The preferred glycinates are sodium cocoglycinate and sodium cocoylglycinate. Mixtures of any of the above amphoteric or zwitterionic surfactants may also be suitable. Preferred mixtures are those of cocamidopropyl betaine with additional amphoteric or zwitterionic surfactants as described above. Another preferred amphoteric or zwitterionic surfactant is sodium cocoamphoacetate. In preferred embodiments, the cleaning phase comprises an anionic alkyl sulfate and / or ethoxylated alkyl sulfate surfactant, preferably present at a level of 8 to 15% by weight of the total composition; and a betaine surfactant, preferably an alkylamidopropylbetaine, which may preferably be present at a level of 1 to 5% by weight of the total composition. The total amount of surfactants (including any of the co-surfactants) in a hair treatment composition is generally 1 to 50% by weight, preferably 2 to 40% by weight, most preferably 10 to 25% by weight of the total composition. RCRnnn / zznz / E / YiAi Piroctone compound The piroctone compound to be used in the present invention may include piroctone acid, primary, secondary, and tertiary olamine salts of piroctone acid (such as diethanolamine and triethanolamine salts), and mixtures thereof, preferably piroctone acid, primary olamine salt of piroctone acid (i.e., piroctone olamine, also known as Octopirox®), and mixtures thereof. The piroctone compound useful in the present invention normally contains the structure defined by formula (IV): RCRnnn / zznz / E / YiAi where R4 is selected from C1-C17 hydrocarbon radicals, Rs is selected from C1-4 alkyl, C2-4 alkenyl or alkynyl, hydrogen, phenyl or benzyl, and Mi is selected from hydrogen, monoethanolamine (MEA), diethanolamine (DEA), or triethanolamine (TEA). The preferred R4 group is (CH3)3CCH2CH(CH3)CH2- and the preferred Rs group is a methyl group. Most preferably, R4 is (CH3)3CCH2CH(CH3)CH2-, Rs is a methyl group, and Mi is hydrogen or MEA. Most preferably, R4 is (CH3)3CCH2CH(CH3)CH2-, Rs is a methyl group, and Mi is a monoethanolamine. Piroctone olamine is particularly preferred. The piroctone compound used in the compositions acts as an anti-dandruff agent. In the compositions and methods according to the invention, it is normally in dissolved form. The typical level of the piroctone compound is 0.01 to 5% by weight of the total composition, preferably 0.05 to 2% by weight, and more preferably 0.1 to 1.5% by weight. In some embodiments, it may be 0.2 to 0.75% by weight. The typical level of piroctone compound is 0.1 to 20% by weight of the total emulsion, preferably 1 to 10% by weight, more preferably 1 to 5% by weight. In a preferred embodiment, the anti-dandruff agent component in the compositions of the invention is less than 50% by weight in solid form (e.g., particles), for example, at least 50% by weight of the anti-dandruff component of the composition is in dissolved form. Conveniently, less than 40% by weight of the anti-dandruff component is in solid form (e.g., at least 60% by weight of the anti-dandruff component may be in dissolved form), conveniently less than 30% by weight is in solid form (e.g., at least 70% by weight may be in dissolved form), conveniently less than 20% by weight is in solid form (e.g., at least 80% by weight may be in dissolved form), conveniently less than 10% by weight is in solid form (e.g., at least 90% by weight may be in dissolved form).In certain formulations, the composition may be essentially free of a solid anti-dandruff agent, such as zinc pyrithione, for example; essentially all the anti-dandruff component of the compositions may be in dissolved form. Oil-in-water emulsion The oil-in-water emulsion is an essential feature of the present invention. The aqueous phase of the emulsion contains water. Suitablely, the emulsion comprises 25 to 85%, preferably 40 to 70%, and most preferably 45 to 60% water by weight of the total emulsion. Silicone is present in the oil-in-water emulsion. Silicone is a conditioning agent intended to be deposited on the hair after rinsing with water. The preferred silicone droplet particle size (Da,2) within the water-in-oil emulsion is 10 nm to 10 microns, with a higher preference for a mean droplet diameter (D3,2) of 50 nm to 5 microns, and a further preference for 100 nm to 5 microns. Ds.2 indicates that the droplet diameter can be measured using a laser light scattering technique, for example, using a Malvern Instruments 2600D Particle Size Meter. The typical level of silicone is 0.1 to 17% by weight of the total composition, preferably 0.5 to 13% by weight, most preferably 1 to 10% by weight. Typical silicones may include polyalkylsiloxanes, polyarylsiloxanes, polyalkylarylsiloxanes, polyethersiloxane copolymer, and mixtures thereof. The silicone may comprise a functionalized silicone. Suitable functionalized silicones include, for example, silicones substituted with hydroxyl, amino, carboxy, betaine, quaternary ammonium, carbohydrate, hydroxy, and alkoxy groups. The functionalized silicone may also contain multiple substitutions. Preferably, the functionalized silicone is an amino silicone, especially if the piroctone compound is to be solubilized in the silicone. Aminosilicones are described in EP455185 and include trimethylsililamodimethicone, as shown below, and are sufficiently insoluble in water to be useful in emulsion: Si(CH3)3-O-[Si(CH3)2-O-]x-[Si(CH3)(R6-NH-CH2CH2-NH2)-O-]ySi(CH3)3, where x + y is a number from approximately 50 to approximately 500, and the weight percent amine functionality is from approximately 0.03% to approximately 8%, and where Re is an alkylene group having 2 to 5 carbon atoms. Preferably, the number x + y is from 100 to 300, and the weight percent amine functionality is from approximately 0.5% to 4%. As stated herein, the weight percent amine functionality is measured by titrating a sample of the amino silicone against alcoholic hydrochloric acid to the bromocresol green endpoint. The weight percentage of amine is calculated using a molecular weight of 45 (corresponding to CH3-CH2-NH2). If the piroctone compound is present as a solution within the water-in-oil emulsion silicone, ammonium silicones are the preferred silicones. An aminosilicone is understood to be a silicone containing at least one primary, secondary, or tertiary amino group, or one quaternary ammonium group. An example of a commercially available aminosilicone useful in the emulsion of the invention is DC 2-8566 available from Dow Corning (INCI: dimethyl, methyl(aminoethylaminoisobutyl)siloxane). Examples of suitable aminosilicones include polysiloxanes that RCRnnn / zznz / E / YiAi have the CTFA designation “amodimethicone”. Specific examples of aminofunctional silicones suitable for use in the invention are amino silicones DC8220, DC8166, DC8466, and DC8950-114, MEM1788 and MEM7128 (all e.g., Dow Corning), and GE 1149-75 (e.g., General Electric Silicones). Suitable quaternary silicone polymers are described in EP0530974A. A preferred quaternary silicone is K3474 (e.g., Goldschmidt). It is also possible to use a mixture of amino and non-amino silicones. It is preferable that at least 50% by weight of the total silicone in the composition be present in the emulsion, more preferably at least 75% by weight. The viscosity of the silicone or silicone mixture isolated from the rest of the composition is adequately 200 to 500,000 mm2 / second at 25°C, preferably 500 to 100,000, more preferably 700 to 50,000, still more preferably 1000 to 10,000, measured by Brookfield LVF, spindles, 30 rpm, 1 minute. The oil-in-water emulsion may further comprise an emulsifier, preferably a nonionic surfactant. The typical emulsifier level is 0.01 to 5% by weight of the total composition, preferably 0.05 to 2.5% by weight, and more preferably 0.1 to 1.5% by weight. The typical emulsifier level of the total emulsion is 0.1 to 20% by weight, preferably 0.5 to 10% by weight, and more preferably 1 to 7.5% by weight. Suitablely, the weight ratio of emulsifier to silicone is 1:1 to 1:50, preferably 1:2 to 1:20, and more preferably 1:5 to 1:15. The suitable nonionic surfactant to act as an emulsifier may include a polyethylene glycol (PEG) compound, for example, trimethylnonylpolyethylene glycol (trade name Tergitol TMN-6, e.g. Dow Chemical or Sigma-Aldrich). The weight ratio of piroctone compound to silicone in the oil-in-water emulsion is preferably 20:1 to 1:20, preferably 1:15 to 15:1, most preferably 1:10 to 10:1. Cationic polymer A cationic polymer comprising a dimethyldiallylammonium portion is an essential feature of the invention. The preferred cationic polymers are homopolymers or copolymers in which a dimethyldiallylammonium moiety is one of the monomers. The most preferred cationic polymers are polyquaternium-6, polyquaternium-7, and polyquaternium-22. Polyquaternium-6 is a particularly preferred cationic polymer. Typically, the cationic polymer is present at a level of 0.01 to 5% by weight of the total composition, preferably 0.05 to 2% by weight, most preferably 0.1 to 1% by weight. In a preferred embodiment, the weight ratio of the cationic polymer to the anti-dandruff agent is 0.6:1 or more, conveniently 0.7:1 or more, conveniently 0.8:1 or more, conveniently 0.9:1 or more. In other preferred embodiments, the weight ratio of cationic polymer to anti-dandruff agent is 1:1 or more, conveniently 1.05:1 or more, conveniently 1.10:1 or more. In a preferred embodiment, the cationic polymer is polyquaternium-6; in a further preferred embodiment, the anti-dandruff agent is at least 50% by weight of piroctone olamine. In a further preferred embodiment, the composition comprises polyquaternium-6 and piroctone olamine, in a weight ratio of 0.6:1 or more, conveniently 0.7:1 or more, conveniently 0.8:1 or more, conveniently 0.9:1 or more. In other embodiments, the weight ratio RCRnnn / zznz / E / YiAi of cationic polymer (e.g., polyquaternum-6) to anti-dandruff agent (e.g., piroctone olamine) is 1:1 or more, conveniently in a weight ratio of 1.05:1 or more. Conveniently, the weight ratio of the cationic polymer to the piroctone compound is no more than approximately 3:1, preferably no more than approximately 2:1, and in some embodiments no more than approximately 1.75:1. Additional cationic deposition polymers can be included, although they are not preferred. Other cationic polymers include polygalactomannans and polysaccharide polymers, such as cationic cellulose derivatives and cationic starch derivatives. Suspension agent The suspending agent is a preferred feature of the composition. Suitable suspending agents are selected from polyacrylic acids, crosslinked acrylic acid polymers, acrylic acid copolymers with a hydrophobic monomer, copolymers of monomers containing carboxylic acid and acrylic esters, crosslinked acrylic acid copolymers and acrylate esters, heteropolysaccharide gums, and crystalline long-chain acyl derivatives. The long-chain acyl derivative is preferably selected from ethylene glycol stearate, fatty acid alkanolamides having 16 to 22 carbon atoms, and mixtures thereof. Ethylene glycol distearate and polyethylene glycol distearate 3 are preferred long-chain acyl derivatives because they impart a pearlescent luster to the composition. Polyacrylic acid is commercially available as Carbopol 420, Carbopol 488 or Carbopol 493.Acrylic acid polymers crosslinked with a polyfunctional agent 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 monomer containing carboxylic acid and acrylic acid esters is Carbopol 1342. All Carbopol (trademark) materials are available from Goodrich. Suitable crosslinked polymers of acrylic acid and acrylate esters are Pemulen TR1 or Pemulen TR2. A suitable heteropolysaccharide gum is xanthan gum, for example, that available as Kelzan mu. Mixtures of any of the above suspending agents may be used. A mixture of crosslinked acrylic acid polymer and a crystalline long-chain acyl derivative is preferred. A more preferred example is a crosslinked polyacrylate polymer. The suspending agent, if included, will generally be present in a shampoo composition of the invention at levels of 0.01 to 5% by weight, preferably 0.1 to 2.5% by weight, most preferably 0.25 to 1% by weight. The viscosity of the composition appropriately ranges from 3,000 to 10,000 mPa.s, preferably from 4,000 to 8,000 mPa.s, more preferably from 5,000 to 7,000 mPa.s when measured using a Brookfield V2 viscometer (RTV5 spindle, 1 minute, 20 rpm) at 30°C. The pH of the composition of the invention preferably ranges between 3 and 9, more preferably between 4 and 7, and even more preferably between 4.5 and 6.5. In a particularly preferred embodiment of the invention, a hair treatment composition is provided comprising: (i) a cleaning step comprising a surfactant, wherein at least 50% by weight of the total surfactant comprises an ethoxylated alkyl sulfate anionic surfactant, the cleaning step comprising RCRnnn / zznz / E / YiAi an anionic alkyl sulfate and / or ethoxylated alkyl sulfate surfactant present at a level of 8 to 15% by weight of the total composition; and a betaine surfactant, preferably an alkylamidopropylbetaine, at a level of 1 to 5% by weight of the total composition; i) an oil-in-water emulsion comprising a silicone; iii) a piroctone compound; and iv) a cationic polymer wherein the cationic polymer comprises a dimethyldiallylammonium portion; in which the anti-dandruff agent component in the composition is less than 50% by weight in solid form. Conveniently, the weight ratio of the cationic polymer to the piroctone compound is 0.6:1 or more, preferably 1:1 or more. In certain embodiments, the composition may be free of a solid anti-dandruff agent, such as zinc pyrithione. Conveniently, the piroctone compound is piroctone olamine. Preferably, the cationic polymer is polyquaternium-6. Conveniently, the silicone is amodimethicone. Other optional components The composition may optionally comprise one or more components for use in hair treatment products, provided that the optional components are physically and chemically compatible with the essential components described above and do not unduly impair the sensory performance, rheology, and conditioning properties of the formulation. The individual concentrations of such optional components may range from 0.001% to 10% by weight of the total composition, preferably from 0.01% to 5% by weight. Such components may include fragrances, dyes and pigments, pH adjusters, pearlescent or opacifying agents, viscosity modifiers, preservatives, and natural hair nutrients, such as botanicals, fruit extracts, sugar derivatives, and amino acids. The composition may also include an additional silicone that is not in the oil-in-water emulsion phase.The additional silicone may be the same as or different from the silicone included in the emulsion phase. The composition may also include additional anti-dandruff and / or antimicrobial agents such as pyridithione salts, pine tar, sulfur, salicylic acid, azoles, selenium sulfide or mixtures thereof. How to use The composition is used to treat a surface. An effective amount of the composition is applied to a selected desired area of ​​hair and / or scalp, which has been moistened, preferably with water. The composition may be left on the surface for a suitable time to take effect, preferably combined with massage, before being rinsed with water. The preferred time is 20 seconds to 2 minutes, preferably 30 seconds to 1 minute. The effective amount typically ranges from 1 to 20 g, preferably 2.5 to 10 g. The present invention can be illustrated by the following non-limiting examples. EXAMPLES The following examples were prepared RCRnnn / zznz / E / YiAi TABLE 1 s| % in pesos | co uo y 04 O co b LO Ó LO Ó Hasta 100 -I co iq y 04 ó co b UO Ó Ó 04 Ó rc — « o ra ra. Z co y LO 04 ó co b LO O Ó «5 — o ra 2 X — 00 UO y 04 o 00 b uo b LO O Ó « O ra ra. XX CO LO 04 ó CO b LO b LO O 3 OX o co T— lo y 04 b CO b LO b 04 O s § ra ra. X 00 T” LO 5— 04 ó co ó LO ó Ó 3 o SO ra raí X LU 00 v— uo 04 o CO b LO ó LO O ó S θ ra ra. X o co y uq y 04 o co b LO b LO ó — s § ra rai X o 00 τ— UO 04 o co b LO ó 04 Ó S § ra ra. X m CO y LO y 04 ó co b LO o ó « o ra 2 X < CO y UO 04 ó co b LO b LO oo S 8 ra raX Tt 00 uo 04 ó cq b LO ó LO Ó ra Λ ω § ra ra X CO 00 τ— UO 04 ó CO b LO b 04 Ó ro — m 8 ra r— X 04 CO T- uo y 04 ó co o LO b O ω o ra raí X y CO T— LO y 04 ó co ó LO ó LO ob ra _ m § ra raí XI Ejemplo I oo tñ Φ O ra 3 ω £ φ L_ ZJ CO _I (ü C Φ Φ n Q o Q. op P ra o 8 o O ra co u5 £ φ 8 •S 8 E τ> Q § 2 Φ E •o ra O Φ E Z5 Φ CL ra c E ra o ra cooo (X ra ra 0 ra ra σ oco E oax Ξ oo OOEOE ra CT O CL LO É ra b Φ ra ra σ O CL ω OE c E ra ZJ O) ACAnnn / zznz / E / γΐΛΐ 0.1 g of the example composition was applied evenly to a strand of hair. The strands were washed twice. After washing, the strands were placed in a drying cabinet (50°C) until dry. Once dry, the strand was transferred to a bottle containing 10 ml of ethanol. The bottle was sealed and placed on a bottle roller for a fixed time. Using a syringe, a sample of the appropriate size for analysis was extracted from the bottle and filtered through a syringe filter into a vial for analysis, using HPLC-UV methodologies, against a set of standards containing known amounts of Octopirox in ethanol (pg / ml). RCRnnn / zznz / E / YiAi TABLE 2 - Octopirox Deposition s OJ LC -i I 6.7 17 * LO u5 — tp T“ Example | | Octopirox deposition | | Dev. Booth. | RCRnnn / zznz / E / YiAi The Examples of the invention deposit Octopirox onto the hair more effectively than the Comparative Examples. Example 2 A shampoo composition comprising (by weight of composition) 13.0% sodium laureth sulfate, 1.5% cocamidopropyl betaine, 2.0% DC1788 silicone emulsion, 0.4% Carbopol 980, 0.75% perfume, 0.5% piroctone olamine, water to 100%, and preservatives, citric acid, and sodium hydroxide to specification, was tested for piroctone olamine deposition with a variety of deposition polymers at the levels indicated below. The amounts indicated are for ppm deposition, with the standard deviation in parentheses: RCRnnn / zznz / E / YiAi Polymer level in formulation Guar C13 GuarC17 JR30M Polyquaternium-6 Polymer 0 5.680(1.207) 5.680 (1.207) 5.680(1.207) 5.680 (1.207) 0.05 6.585 (0.860) 6.426 (1.942) 4.416(0.785) 6.286 (1.625) 0.1 6.406(1.980) 4.645 (0.285) 5.481 (0.742) 7.808 (1.535) 0.2 6.863(1.841) 7.291 (1.263) 6,694(1,794) 10.315(2.075) 0.5 6.993(1.925) 7.579 (1.656) 6.237 (1.224) 16.850 (3.077) The deposition of piroctone olamine with Polyquaternium-6 as the deposition polymer is relatively high compared to other polymers, although it also beneficially demonstrates a dose response.

Claims

1. A hair treatment composition characterized in that it comprises: i) a cleansing step comprising a surfactant, wherein at least 50% by weight of the total surfactant comprises an ethoxylated alkyl sulfate anionic surfactant; ii) an oil-in-water emulsion comprising a silicone; iii) a piroctone anti-dandruff agent compound at a level of 0.1 to 1.5% by weight of the composition; and iv) a cationic polymer wherein the cationic polymer comprises a dimethyldiallylammonium portion, at a level of the composition where the weight ratio of the cationic polymer to the anti-dandruff agent is 1.10:1 or greater; wherein the anti-dandruff agent component in the composition is less than 50% by weight in solid form.

2. The hair treatment composition according to claim 1, further characterized in that the level of the piroctone compound is from 0.1 to 20% by weight of the total emulsion.

3. The hair treatment composition according to claim 1 or 2, further characterized in that the cationic polymer (iv) is polyquaternium-6.

4. The hair treatment composition in accordance with any of the above, further characterized in that the anionic alkyl sulfate ethoxylated surfactant is sodium laureth sulfate.

5. The hair treatment composition according to any of the preceding claims, further characterized in that the silicone is aminosilicone.

6. The hair treatment composition in accordance with any of the above, further characterized in that the piroctone compound is piroctone olamine.

7. The hair treatment composition according to any of the preceding claims, further characterized in that none of the anti-dandruff agents in the composition are in solid form.

8. The hair treatment composition according to any of the preceding claims, further characterized in that it is a shampoo.

9. The hair treatment composition according to any of the preceding claims, further characterized in that it comprises surfactant at a level of 3 to 45% by weight, more preferably 5 to 25% by weight, even more preferably 7 to 20% by weight of the total composition.

10. A non-therapeutic method for treating hair or scalp, characterized in that it comprises applying a hair treatment composition according to any of claims 1 to 9 to the hair or scalp.

11. The non-therapeutic method according to claim 9, further characterized in that the composition is washed off after use.