COMPOSITION FOR THE TREATMENT OF HAIR, EXCLUDING ITS THERAPEUTIC USES, AND METHOD FOR TREATING HAIR OR SCALP, EXCLUDING ITS THERAPEUTIC USES

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 dimethyl diallyl ammonium moiety 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

DESCRIPTIVE MEMORY Field of the invention The present invention relates to a composition for hair treatment, in particular an anti-dandruff composition. Background of the invention Dandruff is a problem that affects many people around the world. The condition manifests itself as the shedding of clumps of dead skin cells from the scalp. These are white and provide an aesthetically unsightly appearance. Factors that contribute to dandruff are certain members of the Malassezia yeast. To combat these, hair treatment compositions are being developed, which include various active compounds for their anti-dandruff efficacy. Piroctone compounds such as piroctone olamine are one such active compound. A common problem with piroctone compounds is that their deposition on the hair or scalp during the washing process is difficult. This is particularly the case when effective anionic cleansing surfactants such as sodium laureth sulfate are present in the composition. During the excessive rinsing process, most of the piroctone is likely washed away along with the surfactants. Low deposition correlates with low anti-dandruff activity, thus, little mitigation of the harmful effects of dandruff. To date, there are attempts to compensate for this drawback by increasing the level of piroctone olamine in the hair treatment composition. Such an approach causes a variety of problems, such as increased costs, potential formulation instability, and a possible adverse effect on the sensory properties of the hair. Therefore, it is not an approach favored by the industry. 1022649 of 25 Document DE 102012203240 A1 describes a hair treatment composition with an enhanced anti-dandruff effect and improved combability, 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 vegetable extract, and a cationic aminosilicone. Examples include shampoos and conditioners comprising Octopirox® (Piroctone Olamine), aminosilicone, and surfactants. US 2013 / 0059929A1 describes a cosmetic or dermatological preparation comprising at least one of benzethonium chloride, methylisothiazolinone, piroctone olamine, and lauroylethyl arginate, and does not contain a preservative comprising a phenolic group. The preparations exhibit improved 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. Several commercial products allegedly sold under the Ultra Doux and Nak brands in China between 2016 and 2019 are alleged to contain, inter alia, 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 product was commercially available prior to the priority date of this patent application. The listing or exposition of a document apparently previously published in this specification should not necessarily be taken as 1022649 of 25 recognition that the document is part of the prior art or is common general knowledge. Despite the prior art, 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 cleansing process. There also remains a further need to improve deposition on the hair and / or scalp without adversely affecting cleansing and conditioning performance. The present invention addresses one or more needs described above. Summary of the invention In a first aspect of the present invention, there is provided a composition for hair treatment, comprising: i) a cleaning phase 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; and iv) a cationic polymer wherein the cationic polymer comprises a dimethyl diallyl ammonium moiety. In a second aspect of the present invention, there is provided a non-therapeutic method for treating hair or scalp, comprising applying to the hair or scalp the hair treatment composition as described above. 1022649 of 25 In the context of the present invention, the expression "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 hair lotions, creams, shampoos, serums, or conditioners. Preferably, the hair treatment composition is an anti-dandruff hair 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 one or more additional preferred features. Any feature of a particular embodiment of the present invention may be used and considered as described in combination with any other embodiment of the invention. All percentages by weight (% wt) are based on the final weight of the composition unless otherwise indicated. Numerical ranges expressed in the format "xy" are understood to include x and y unless otherwise specified. Numbers may be qualified by the term "approximately". When a specific characteristic is described 1022649 of 25 multiple preferred intervals in the x and y format, it is understood that all intervals that combine the different parameters are also contemplated. Composition for hair treatment The composition preferably comprises a cosmetically acceptable carrier. A "cosmetically acceptable carrier" means a carrier that is compatible with hair, skin, integuments, or mucous membranes, without causing any unacceptable discomfort that would discourage the consumer from using the composition. The preferred carrier is water. The preferred composition format is an anti-dandruff shampoo. The anti-dandruff shampoo may suitably comprise 50 to 90%, preferably 60 to 80%, of water by weight of the total shampoo. Cleaning phase The cleansing phase comprises one or more cleansing surfactants. Cleansing surfactants refer to those that act to cleanse the hair and / or scalp. The total level of cleansing surfactants is preferably 3 to 45%, more preferably 5 to 25%, and most preferably 7 to 20% by weight of the total composition. Preferably, the cleansing surfactant comprises an anionic surfactant. The anionic surfactant comprises an ethoxylated alkyl sulfate anionic surfactant. Preferred alkyl ether sulfates are those of formula (I): RO-(CH2CH2-O)n-SO3-M+ (I) 1022649 of 25 wherein R is a straight 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 ethoxylate 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, more preferably 8 to 15% by weight. Other surfactants may be present in the composition, such as alkyl sulfates. Preferred alkyl sulfates are C8-18 alkyl sulfates, 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 are sodium lauryl sulfate (SLS) or sodium dodecyl sulfate (SDS). The cleansing phase may comprise one or more additional anionic surfactants that are cosmetically acceptable and suitable for topical application to the hair and / or scalp. Examples of other anionic surfactants include alkyl sulfonates, alkyl succinates, alkyl sulfosuccinates, alkyl ether sulfosuccinates, N-alkyl sarcosinates, alkyl phosphates, alkyl ether phosphates, and alkyl ether carboxylic acids and their salts, especially their sodium, magnesium, ammonium, and mono-, di-, and triethanolamine salts. The alkyl ether sulfosuccinates, alkyl ether phosphates, and alkyl ether carboxylic acids and their salts may contain from 1 to 20 ethylene oxide or propylene oxide units per molecule. Typical anionic cleansing surfactants for use in shampoo compositions according to the present invention include sodium oleyl succinate, 1022649 of 25 ammonium lauryl sulfosuccinate, sodium lauryl ether sulfosuccinate, sodium dodecylbenzenesulfonate, triethanolamine dodecylbenzenesulfonate, lauryl ether carboxylic acid, sodium N-lauryl sarcosinate, lauryl monoglyceride sodium sulfate, sodium lauryl sulfate, sodium laureth sulfate, sodium cocoyl sulfate, sodium cocoyl isethionate and mixtures thereof. The composition may include cosurfactants to help impart aesthetic, physical, or cleansing properties to the composition. The cosurfactant is preferably included in the cleansing phase of the composition. An example of a cosurfactant is a nonionic surfactant, which may be included in an amount ranging from 0.5 to 10%, preferably from 2 to 8%, more preferably from 1 to 5% by weight of the total composition. For example, representative nonionic surfactants that may be included in the treatment compositions, preferably the shampoo compositions of the invention, include condensation products of straight or branched chain primary or secondary aliphatic (C8-C18) alcohols or phenols with alkylene oxides, usually ethylene oxide and generally having from 6 to 30 ethylene oxide groups. Other representative nonionic surfactants include mono- or di-alkyl alkanolamides. Examples include coco mono- or diethanolamide and coco-mono-isopropanolamide. Other nonionic surfactants that may be included are alkyl polyglycosides (APGs). Typically, the APG comprises an alkyl group connected (optionally via a bridging group) to a block of one or more glycosyl groups. Preferred APGs are defined by the following formula (II): R'O - (G)k (II) 1022649 of 25 wherein R' is a branched or straight chain alkyl group which may be saturated or unsaturated and G is a saccharide group. R' may represent an average alkyl chain length of from about C5 to about C20. Preferably, R' represents an average alkyl chain length of from about C8 to about C12. Most preferably, the value of R' is between about 9.5 and about 10.5. G may be selected from C5 or C6 monosaccharide residues and is preferably a glucoside. G may be selected from the group consisting of glucose, xylose, lactose, fructose, mannose and derivatives thereof. Preferably, G is glucose. The degree of polymerization, k, may have a value from about 1 to about 10 or more; preferably, the value of k is from about 1.1 to about 2; Most preferably, the value of m is from about 1.3 to about 1.5.Suitable alkyl polyglycosides for use in the invention are commercially available and include, for example, those materials identified as: Oramix NS10 from Seppic; Plantaren 1200 and Plantaren 2000 from Henkel. Other sugar-derived non-ionic surfactants, which may be included in compositions (preferably shampoos) of the invention include C10-C18 N-alkyl (C1-C6) polyhydroxy fatty acid amides, such as C12-C18 N-methyl glucamides, as described, for example, in WO 92 06154 and US 5,194 194 639, and N-alkoxy polyhydroxy fatty acid amides, such as C10-C18 N-(3-methoxypropyl)glucamide. A preferred example of a co-surfactant is an amphoteric or zwitterionic surfactant, which may be included in an amount ranging from 0.5 to about 10%, preferably from 2 to 8%, more preferably from 1 to 5% by weight of the total composition. 1022649 of 25 Examples of amphoteric or zwitterionic surfactants include alkylamine oxides, alkyl betaines, alkylamidopropyl betaines, alkyl sulfobetaines (sultaines), alkyl glycinates, alkyl carboxyglycinates, alkyl amphoacetates, alkyl amphopropionates, alkyl glycinates, alkylamidopropyl hydroxysultaines, acyl taurates and acyl glutamates, wherein the alkyl and acyl groups have 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 the general formula (III): or r2 Ri----C---NH(CH2)m---N---CH2CO2R3 (III) where m is 2 or 3; R1C(O) is selected from linear or branched, saturated or unsaturated acyl groups having from 8 to 22 carbon atoms and mixtures thereof; and R2 and R3 are each independently selected from alkyl, hydroxyalkyl or carboxyalkyl groups having from 1 to 6 carbon atoms and mixtures thereof; An example is cocamidopropyl betaine. The preferred level of such a surfactant is from 0.5 to 10% by weight of the total composition, more preferably from 2 to 8% by weight, most preferably from 1 to 5% by weight. An additional but preferred optional surfactant is an alkyl glycinate and / or alkyl carboxyglycinate. If present, it is present at a level of 1 to 8% by weight, preferably 2 to 6% by weight. 1022649 of 25 Preferably, the alkyl glycinate and / or alkyl carboxyglycinate have a C8-22 alkyl group, in the form of a salt with a solubilizing cation such as sodium, potassium, ammonium, or substituted ammonium. 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. A preferred additional amphoteric or zwitterionic surfactant is sodium cocoamphoacetate. In preferred embodiments, the cleansing 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 alkyl amidopropyl betaine, 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 co-surfactants) in a hair treatment composition is generally 1 to 50% by weight, preferably 2 to 40% by weight, more preferably 10 to 25% by weight of the total composition. Piroctone compound The piroctone compound for use in the present invention include piroctone acid, primary, secondary and tertiary olamine salts of piroctone acid (such as diethanolamine and triethanolamine salts), and mixtures of the foregoing, preferably piroctone acid, primary olamine salt of 1022649 of 25 piroctone acid (i.e. piroctone olamine, also known as Octopirox®) and mixture of the above. The piroctone compound useful in the present invention typically contains the structure defined by formula (IV): R, R5 O' M (IV) wherein R4 is selected from C1-C17 hydrocarbon radicals, R5 is selected from C1-4 alkyl, C2-4 alkenyl or alkynyl, hydrogen, phenyl or benzyl, and M1 is selected from hydrogen, monoethanolamine (MEA), diethanolamine (DEA), or triethanolamine (TEA). The preferred R4 group is (CH3)3CCH2CH(CH3)CH2- and preferred R5 is a methyl. More preferably, R4 is (CH3)3CCH2CH(CH3)CH2-, R5 is a methyl and M1 is hydrogen or MEA. Most preferably, R4 is (CH3)3CCH2CH(CH3)CH2-, R5 is a methyl and M1 is monoethanolamine. Piroctone olamine is particularly preferred. The piroctone compound used in the compositions acts as an anti-dandruff agent. In compositions and methods according to the invention, it is typically in dissolved form. The preferred level of the piroctone compound is 0.01 to 5% by weight of the total composition, preferably 0.05 to 2% by weight, more 1022649 of 25 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 the 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 (e.g., particulate) form, e.g., at least 50% by weight of the anti-dandruff component in the composition is in dissolved form. Suitably, 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), suitably less than 30% by weight is in solid form (e.g., at least 70% by weight may be in dissolved form), suitably less than 20% by weight is in solid form (e.g., at least 80% by weight may be in dissolved form), suitably less than 10% by weight is in solid form (e.g., at least 90% by weight may be in dissolved form). In certain embodiments, the composition may be essentially free of solid anti-dandruff agent, such as zinc pyrithione, e.g., essentially all of 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. 1022649 of 25 The aqueous phase of the emulsion contains water. Suitably, the emulsion comprises 25 to 85%, preferably 40 to 70%, more 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 particle size of the silicone droplet (D3,2) within the water-in-oil emulsion is preferably from 10 nm to 10 microns, more preferably it has a mean droplet diameter D3,2 of from 50 nm to 5 microns, most preferably from 100 nm to 5 microns. D3,2 refers to the droplet diameter which can be measured by means of a laser light diffraction technique, for example using a 2600D Particle Sizer from Malvern Instruments. The typical level of silicone is 0.1 to 17% by weight of the total composition, preferably 0.5 to 13% by weight, more preferably 1 to 10% by weight. Typical silicones may include polyalkyl siloxanes, polyaryl siloxanes, polyalkylaryl siloxanes, polyether siloxane copolymer and mixtures thereof. The silicone may comprise a functionalized silicone. Suitable functionalized silicones include, for example, hydroxyl-, amino-, carboxy-, betaine-, quaternary ammonium-, carbohydrate-, hydroxy-, and alkoxy-substituted silicones. The functionalized silicone may also contain multiple substitutions. 1022649 of 25 Preferably, the functionalized silicone is an aminosilicone, especially if the piroctone compound is to be solubilized in the silicone. Aminosilicones are described in EP455185 and include trimethylsilylamodimethicone as represented below, and are sufficiently insoluble in water to be useful in the emulsion: If (CH3)3-O-[Si(CH3)2-O-]x-[Si(CH3) (R6-NH-CH2CH2-NH2)-O-]y-Si(CH3)3 wherein x + y is a number from about 50 to about 500, and the weight percent of amine functionality is from about 0.03% to about 8%, and wherein R6 is an alkylene group having 2 to 5 carbon atoms. Preferably, the number x + y is from 100 to 300, and the weight percent of amine functionality is from about 0.5% to 4%. As expressed herein, the weight percent of amine functionality is measured by titrating a sample of the aminosilicone against alcoholic hydrochloric acid to the bromocresol green parameter. 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 silicone of the water-in-oil emulsion, aminosilicones are the preferred silicones. By aminosilicone is meant a silicone containing at least one primary, secondary, or tertiary amine group, or a 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 having the CTFA designation amodimethicone. Specific examples of suitable amino-functional silicones for use in the invention are aminosilicones DC8220, DC8166, DC8466 and DC8950-114, MEM1788 and MEM7128 (all from Dow Corning) and GE 1149-75 (from General Electric Silicones). Suitable quaternary silicone polymers are described in EP0530974A. A preferred quaternary silicone polymer is K3474 (from 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 is present in the emulsion, more preferably at least 75% by weight. The viscosity of the silicone or silicone blend isolated from the remainder of the composition is suitably 200-500,000 mm2 / second at 25°C, preferably 500-100,000, more preferably 700-50,000, even more preferably 1000-10,000, as measured by Brookfield LVF, spindle 3, 30 rpm, 1 minute. The oil-in-water emulsion may further comprise an emulsifier, preferably a non-ionic surfactant. A typical level of emulsifier is from 0.01 to 5% by weight of the total composition, preferably from 0.05 to 2.5% by weight, more preferably from 0.1 to 1.5% by weight. A typical level of emulsifier is from 0.1 to 20% by weight of the total emulsion, preferably from 0.5 to 10% by weight, more preferably from 1 to 7.5% by weight. Suitably, the weight ratio of emulsifier to silicone is from 1:1 to 1:50, preferably from 1:2 to 1:20, more preferably from 1:5 to 1:15. The nonionic surfactant suitable for acting as an emulsifier may include a polyethylene glycol (PEG) compound, for example, 1022649 of 25 trimethylnonylpolyethylene glycol (trade name Tergitol TMN-6, from Dow Chemical or Sigma-Aldrich). The weight ratio of the piroctone compound to silicone in the oil-in-water emulsion is preferably 20:1 to 1:20, preferably 1:15 to 15:1, more preferably 1:10 to 10:1. Cationic polymer A cationic polymer comprising a dimethyl diallyl ammonium moiety is an essential feature of the invention. Preferred cationic polymers are homo- or copolymers in which a dimethyl diallylammonium moiety is one of the monomers. The most preferred cationic polymers are polyquaternium-6, polyquaternium-7, and polyquaternium-22. A particularly preferred cationic polymer is polyquaternium-6. 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, more preferably 0.1 to 1% by weight. In a preferred embodiment, the weight ratio of cationic polymer to anti-dandruff agent is 0.6:1 or more, suitably 0.7:1 or more, suitably 0.8:1 or more, suitably 0.9:1 or more. In another preferred embodiment, the weight ratio of cationic polymer to anti-dandruff agent is 1:1 or more, suitably 1.05:1 or more, suitably 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, suitably 0.7:1 or more. 1022649 of 25 0.7:1 or more, conveniently 0.8:1 or more, conveniently 0.9:1 or more. In other embodiments, conveniently, the weight ratio of cationic polymer (e.g., polyquaternium-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 cationic polymer to piroctone compound is no more than about 3:1, preferably no more than about 2:1, and in some embodiments, no more than about 1.75:1. Additional cationic deposition polymers may be included, but are not preferred. Other cationic polymers include polygalactomannans and polysaccharide polymers, such as cationic cellulose derivatives and cationic starch derivatives. Suspending agent The suspending agent is a preferred feature of the composition. Suitable suspending agents are selected from polyacrylic acids, crosslinked polymers of acrylic acid, copolymers of acrylic acid with a hydrophobic monomer, copolymers of carboxylic acid-containing monomers and acrylic esters, crosslinked copolymers of acrylic acid and acrylate esters, heteropolysaccharide gums, and crystalline derivatives of long-chain acyls. The long-chain acyl derivative is 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 since they impart pearlescence to the composition. Polyacrylic acid is commercially available as Carbopol 420, Carbopol 488 or Carbopol 493. Polymers of 1022649 of 25 crosslinked acrylic acid 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 carboxylic acid containing monomer and acrylic acid esters is Carbopol 1342. All Carbopol (registered trademark) materials are available from Goodrich. Suitable crosslinked acrylic acid polymers 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 can be used. A mixture of cross-linked 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 from 0.01 to 5% by weight, preferably from 0.1 to 2.5% by weight, more preferably from 0.25 to 1% by weight. The viscosity of the composition 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, even more preferably between 4.5 and 6.5. In a particularly preferred embodiment of the invention, there is provided a composition for hair treatment, comprising: 1022649 of 25 (i) a cleaning phase comprising a surfactant, wherein at least 50% by weight of the total surfactant comprises an anionic alkyl sulphate ethoxylate surfactant, wherein the cleaning phase comprises an anionic alkyl sulphate and / or alkyl sulphate ethoxylate surfactant present at a level of 8 to 15% by weight of the total composition; and a betaine surfactant, preferably an alkyl amidopropyl betaine, at a level of 1 to 5% by weight of the total composition; ii) an oil-in-water emulsion comprising a silicone; iii) a piroctone compound; and iv) a cationic polymer wherein the cationic polymer comprises a dimethyl diallyl ammonium moiety, wherein 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, conveniently 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 an 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 hereinabove, and that they do not otherwise unduly impair sensory performance, formulation rheology, and conditioning performance. 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%. 1022649 of 25 weight. Such components may include fragrances, dyes and pigments, pH adjusting agents, pearlescent or opacifying agents, viscosity modifiers, preservatives, and natural hair nutrients such as botanicals, fruit extracts, sugar derivatives, and amino acids. The composition may comprise an additional silicone that is not present in the oil-in-water emulsion phase. The additional silicone may be the same as or different from the silicone present in the emulsion phase. The composition may also comprise additional anti-dandruff agents and / or antimicrobial agents such as pyridinethione salts, pine tar, sulfur, salicylic acid, azoles, selenium sulfide or mixtures thereof. Method of use The composition is used in a manner to treat a surface. An effective amount of the composition is applied to a selected desired surface of hair and / or scalp, which has preferably been moistened with water. The composition may be allowed to remain on the surface for a predetermined time to take effect, preferably in combination with massage, before being rinsed with water. The time given is preferably from 20 seconds to 2 minutes, more preferably from 30 seconds to 1 minute. The effective amount typically ranges from 1 g to 20 g, preferably from 2.5 g to 10 g. The invention will now be illustrated by the following non-limiting examples. EXAMPLES The following examples were prepared: 1022649 of 25 TABLE 1 Example 1 2 3 4 ABCDEFGHIKLM % by weight Sodium laureth sulfate 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 Cocamidopropyl betaine 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 Dimethiconol / TEAdodecylbenzenesulfonate 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 Carbomer 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 Perfume 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 Pyroctone Olamine 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Guar 0.05 0.1 0.2 0.5 Guar-hydroxypropyltriam onium chloride 0.05 0.1 0.2 0.5 Polyquaternium-10 0.05 0.1 0.2 0.5 Polyquaternium-6 0.05 0.1 0.2 0.5 Water and components less than 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 1022649 of 25 0.1 g of example composition / g of hair was applied evenly onto a strand of hair. The hair strands were washed twice. Once washed, 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 appropriate size for analysis was withdrawn 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). 1022649 of 25 Table 2 - Octopirox Deposition Example 1 2 3 4 ABCDEFGHIKLM Silicone Deposition (ppm) 6.2 7.8 10.3 16.8 6.6 6.4 6.8 7.0 6.4 4.6 7.3 7.6 4.4 5.5 6.7 6.2 Std. Dev. 1.2 1.6 2.1 3.1 0.9 2.0 1.8 1.9 1.9 0.3 1.3 1.7 1.6 1.5 2.1 3.1 1022649 of 25 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 the composition) 13.0% sodium laureth sulfate, 1.5% cocamidopropyl betaine, 2.0% silicone emulsion DC1788, 0.4% Carbopol 980, 0.75% perfume, 0.5% piroctone olamine, 100% water and preservatives, citric acid and sodium hydroxide as specified, was tested for piroctone olamine deposition with a range of deposition polymers at the levels set out below. The amounts stated are for deposition in ppm, with the standard deviation in parentheses: Polymer level in formulation (% by weight) Guar C13 Guar C17 Polymer JR30M Polyquaternium-6 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, but also beneficially demonstrates a dose response. 1022649 of 25 MOELLER & CO. SA - 30529767664 Digitally signed by PORTALTRAM ITES - INPI Date: 2020.07.24 10:41:00 -03:00 Reason: Digitally signed by the INPI Location: Buenos Aires, Argentina 1022649

Claims

1. A hair treatment composition, excluding its therapeutic uses, characterized in that it comprises: i) a cleansing phase comprising a surfactant, wherein at least 50% by weight of the total surfactant comprises an ethoxylated alkyl sulfate anionic surfactant, wherein the ethoxylated alkyl sulfate anionic surfactant is sodium laureth sulfate; ii) an oil-in-water emulsion comprising a silicone, wherein the oil-in-water emulsion comprises 45 to 60% water by weight of the total emulsion; iii) an anti-dandruff agent composed of piroctone at a level of 0.1 to 1.5% by weight of the composition; and iv) a cationic polymer, wherein the cationic polymer comprises polyquaternium-6 or polyquaternium-7, wherein the weight ratio of cationic polymer to anti-dandruff agent is 0.7: to 2:1; wherein the anti-dandruff agent component in the composition is less than 50% by weight in solid form. Eleven claims follow.