PERSONAL CLEANSING COMPOSITION, EXCLUDING ITS THERAPEUTIC USES

Abstract

A personal cleansing composition comprising: i) a cleansing surfactant comprising an amphoteric surfactant and an anionic surfactant which, if ethoxylated, has a degree of ethoxylation of less than 3, wherein the ratio of the anionic surfactant to the amphoteric surfactant is less than 5:1; ii) an oily phase comprising at least one triglyceride oil; iii) an aliphatic fatty acid or a salt thereof having a carbon chain length of C4 to C 10 ; and iv) a piroctone compound; wherein the composition has a pH at 20ºC of 6 or lower and the weight ratio between the aliphatic fatty acid and the triglyceride oil is from 1:2 to 5:1.

Description

DESCRIPTIVE MEMORANDUM Field of invention The present invention relates to a hair treatment composition, particularly 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, which are white and give an aesthetically unpleasant appearance. One contributing factor to dandruff is certain members of the Malassezia yeast family. To combat these yeasts, hair treatment formulations are developed that include various active ingredients for their anti-dandruff efficacy. Piroctone, such as piroctone olamine, is one such active ingredient. A common problem with piroctone compounds is minimal deposition of the active ingredient onto the desired surface during the washing process. The desired surface is typically the scalp and / or hair. For example, piroctone compounds such as piroctone olamine are generally soluble in the surfactants of the cleansing phase in hair treatment formulations. During excessive rinsing, most of the piroctone is likely to be washed away with the surfactants. This poor deposition correlates with low anti-dandruff activity, resulting in little mitigation of the harmful effects of dandruff. To date, attempts are being made to compensate for this disadvantage by increasing the amount of piroctone. 1282505 of 26 olamine in the hair treatment composition. This approach causes several problems such as increased costs, potential instability of the formulation, and a potential adverse effect on hair feel. Therefore, it is not a preferred approach by the industry. US2002 / 0035161A1 describes a cosmetic / pharmaceutical oil-in-water emulsion that includes a discontinuous fat phase dispersed in a continuous aqueous phase and comprises an effective amount of at least one biologically active agent (A) and an effective amount of an emulsifying system (B), said at least one biologically active agent (A) not soluble therein in the micronized particle state, at least 80%, numerically, of said micronized particles have diameters between 1 and 10 pm and at least 50%, also numerically, have diameters less than 5 pm. The pending European application together with the present one with number (sic) describes an increased deposition of Octopirox in a hair care composition containing a cleansing surfactant comprising an amphoteric surfactant and an ethoxylated anionic surfactant in a ratio of 2:1 to 6:1. The enhanced deposition of Octopirox in a composition comprising polyquaternium 6 is described in the European application pending with the present 11988726.4. Despite all the previous techniques, further improvement is still needed. 1282505 of 26 Deposition of piroctone compounds, especially piroctone acid or piroctone olamine, on the surface of the scalp and / or hair during the washing process. There is also a further need to improve deposition on this surface without adverse side effects on sensory properties, formulation rheology, and conditioning performance. Description of the Invention The present invention relates to a personal hygiene composition comprising i) a cleaning surfactant comprising an amphoteric surfactant and an anionic surfactant which, if ethoxylated, has a degree of ethoxylation of less than 3, wherein the ratio between the anionic surfactant and the amphoteric surfactant is less than 5:1; ii) an oily phase comprising at least one liquid oil of hydrocarbon triglycerides; iii) An aliphatic fatty acid or a salt thereof having a carbon chain length of C4 to C10; and iv) a piroctone compound; where the composition has a pH at 20°C of less than 6 or lower and the weight ratio between aliphatic fatty acid and triglyceride oil is from 1:2 to 5:1. The invention also relates to a non-therapeutic method for treating hair or scalp, comprising the application of the 1282505 of 26 personal care composition described above. The invention also relates to a composition described above for use in a method for mitigating dandruff. For the avoidance of doubt, any feature of one aspect of the present invention may be used in any other aspect of the invention. Any feature described as preferred should be understood as particularly preferred in combination with one or more other preferred features. In the present invention, any feature of one particular embodiment may be used in any other embodiment of the invention. All percentages are weight / weight percentages unless otherwise stated. Detailed description of the invention The piroctone compound for use in the present invention includes 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. Piroctone olamine is an olamine salt of the hydroxamic acid derivative piroctone. It is commonly known as piroctone ethanolamine and is sold under the trade name Octopirox®. 1282505 of 26 Piroctone olamine according to the present invention is a 1:1 compound of 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(7 / - / )-pyridinone with 2-aminoethanol and is also called 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(7 / - / )pyridinone monoethanolamine salt. The CAS number is 68890-66-4 and the compound has the general formula (I) as shown below: The piroctone compound, particularly piroctone olamine, is preferably present between 0.01 and 5% by weight of the total composition, more preferably between 0.1 and 5% by weight, with maximum preference between 0.2 and 3% by weight of the total composition. The compositions of the invention comprise an oily phase comprising a triglyceride oil. The preferred triglycerides comprise almond oil, coconut oil, olive oil, palm oil, peanut oil, and sunflower oil. Coconut oil is especially preferred. The compositions according to the invention comprise an oil phase. It is preferable that the oil phase forms worm-like micelles in a 1282505 of 26 continuous aqueous phase. It is preferable that the oil phase be a bicontinuous phase and / or a true emulsion. Preferably, the total amount of non-volatile hydrocarbon oil is 0.02 to 2% by weight of the total composition, more preferably 0.05 to 1.0% by weight. The compositions of the invention comprise an aliphatic fatty acid or salt thereof having a carbon chain length of C4 to C10; preferably the fatty acid or salt thereof is caprylic acid or its salt. The weight ratio between aliphatic fatty acid and triglyceride is between 1:2 and 5:1, more preferably between 2:3 and 3:1. The composition according to the invention has a pH at 20°C of 6 or lower, preferably lower than 6, more preferably lower than 5.5, and most preferably 5 or lower. Preferably, the pH at 20°C is higher than 3. The cosmetic composition comprises a cleansing surfactant. Surfactants are compounds that have hydrophilic and hydrophobic portions that act to reduce the surface tension of the aqueous solutions in which they are dissolved. The cleansing surfactant comprises an amphoteric surfactant and an ethoxylated anionic surfactant, wherein the anionic surfactant preferably has an average degree of ethoxylation of less than 2.5, more preferably less than 2, with a maximum preference of less than 1.5. 1282505 of 26 The alkyl chain of the ethoxylated anionic surfactant preferably has between 8 and 18, more preferably between 10 and 16 carbon atoms and may be unsaturated. The preferred alkyl ether sulfates are those of formula (I): RO-(CH2CH2-O)n-SO3-M+ (I) where 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, preferably 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 with an average degree of ethoxylation of 3 or higher, preferably an average degree of ethoxylation of 3; preferably the surfactant is sodium lauryl ether sulfate (3EO). Preferred amphoteric or zwitterionic cleaning surfactants include alkyl amine oxides, alkyl betaines, alkyl amidopropyl betaines, alkyl sulfobetaines (sultains), alkyl glycinates, alkyl carboxyglycinates, alkyl amphoacetates, alkyl amphopropionates, alkylamphoglycinates, alkyl amidopropyl hydroxysultains, acyl taurates, and acyl glutamates, wherein the alkyl and acyl groups have between 8 and 19 carbon atoms. Preferred amphoteric surfactants include cocodimethyl sulfopropyl betaine, lauryl betaine, coco betaine, coamidopropyl betaine, and sodium cocoamphoacetate. A particularly preferred amphoteric surfactant is cocamidopropyl betaine. The relationship between ethoxylated anionic surfactant and amphoteric surfactant 1282505 of 26 is less than 5:1, preferably from 2:1 to 5:1, more preferably from 3:1 to 4:1. The total amount of cleaning surfactant in a shampoo composition for use in the invention is generally from 3 to 35% by weight, preferably from 5 to 25% by weight, with maximum preference being from 7 to 15% by weight of the total composition. Non-limiting examples of other anionic cleaning surfactants, which may be present but are not preferred, include alkyl sulfates, alkaryl sulfonates, N-alkyl sarcosinates, alkyl phosphates, alkyl ether phosphates, acyl amino acid-based surfactants, carboxylic alkyl ether acids, acyl taurates, acyl glutamates, alkyl glycinates, and their salts, especially their sodium, magnesium, ammonium salts, and mono-, di-, and triethanolamine salts. The alkyl and acyl groups in the above list generally contain 8 to 18, preferably 10 to 16, carbon atoms and may be unsaturated. Other, non-limiting examples of cleaning surfactants may include nonionic cleaning surfactants comprising linear or branched primary or secondary aliphatic alcohols (C8–C18) with alkylene oxides, generally ethylene oxide, and typically having 6 to 30 ethylene oxide groups. However, non-ionic cleaning surfactants are preferred. Other representative cleaning surfactants include mono- or di-alkyl alkanolamides (examples include coco-monoethanolamide and coco-monoisopropanolamide) and alkyl polyglycosides (APGs). Suitable alkyl polyglycosides 1282505 of 26 for use in the invention are commercially available and include, for example, those materials identified as: Plantapon 1200 and Plantapon 2000 from BASF. Other sugar-derived surfactants that may be included in compositions for use in the invention include C10-C18 N-alkyl (Cl-C6) polyhydroxy fatty acid amides, such as C12-C18 N-methylglucamides, as described, for example, in WO 92 06154 and US 5 194 639, and N-alkoxy polyhydroxy fatty acid amides, such as C10-C18 N-(3-methoxypropyl)glucamide. Personal care compositions may include at least one cationic deposition polymer. Suitable cationic polymers may be homopolymers that are cationically substituted or may be formed from two or more types of monomers. The weight-average molecular weight (Mw) of the polymers will generally be between 100,000 and 2 million daltons. The polymers will have groups containing cationic nitrogen, such as quaternary ammonium or protonated amino groups, or a mixture thereof. If the polymer's molecular weight is too low, the conditioning effect will be poor. If it is too high, high extensional viscosity problems may arise, leading to fibrousness of the composition when poured. The group containing cationic nitrogen will generally be present as a substituent on a fraction of all the monomeric units of the cationic polymer. Therefore, when the polymer is not a homopolymer, it may contain non-cationic spacer monomeric units. 1282505 of 26 polymers are described in the CTFA Cosmetic Ingredient Directory, 3rd edition. The ratio of cationic to non-cationic monomeric units is selected to yield polymers with a cationic charge density in the required range, typically 0.2 to 3.0 meq / g. The cationic charge density of the polymer is appropriately determined by the Kjeldahl method as described in the United States Pharmacopeia under Chemical Tests for the Determination of Nitrogen. Suitable cationic polymers include, for example, copolymers of vinyl monomers having cationic amine or quaternary ammonium functional groups with water-soluble spacer monomers such as (meth)acrylamide, alkyl and dialkyl (meth)acrylamides, alkyl (meth)acrylate, vinyl caprolactone, and vinyl pyrrolidine. The alkyl- and dialkyl-substituted monomers preferably have C1-C7 alkyl groups, more preferably C1-3 alkyl groups. Other suitable spacers include vinyl esters, vinyl alcohol, maleic anhydride, propylene glycol, and ethylene glycol. Cationic amines can be primary, secondary, or tertiary amines, depending on the specific species and the pH of the composition. Secondary and tertiary amines are generally preferred, especially tertiary amines. Amine-substituted vinyl monomers and amines can be polymerized in amine form and then converted to ammonium by quaternization. 1282505 of 26 Cationic polymers may comprise mixtures of monomeric units derived from amine-substituted monomer and / or quaternary ammonium and / or compatible spacer monomers. Suitable cationic polymers (non-limiting examples) include: - cationic polymers containing diallyl and quaternary ammonium, including, for example, dimethyldiallylammonium chloride homopolymer and acrylamide and dimethyldiallylammonium chloride copolymers, referred to in the industry (CTFA) as Polyquaternium 6 and Polyquaternium 7, respectively; - mineral acid salts of aminoalkyl esters of homopolymers and copolymers of unsaturated carboxylic acids having 3 to 5 carbon atoms, (as described in U.S. Patent No. 4,009,256); - cationic polyacrylamides (as described in document WO95 / 22311). Other cationic polymers that can be used include cationic polysaccharide polymers, such as cationic cellulose derivatives, cationic starch derivatives, and cationic guar gum derivatives. Cationic polysaccharide polymers suitable for use in compositions for use in the invention include monomers of the formula: AO-[R-N+(R1)(R2)(R3)X-], 1282505 of 26 where: A is an anhydroglucose residue group, such as a starch or cellulose anhydroglucose residue. R is an alkylene, oxyalkylene, polyoxyalkylene, or hydroxyalkylene group, or a combination thereof. R1, R2, and R3 independently represent alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, or alkoxyaryl groups, each group containing up to approximately 18 carbon atoms. The total number of carbon atoms for each cationic residue (i.e., the sum of the carbon atoms in R1, R2, and R3) is preferably approximately 20 or less, and X is an anionic counterion. Another type of cationic cellulose includes quaternary ammonium polymer salts of hydroxyethylcellulose reacted with lauryl dimethyl ammonium epoxide, referred to in the industry (CTF A) as Polyquaternium 24. These materials are available from Amerchol Corporation, for example under the trade name Polymer LM-200. Other suitable cationic polysaccharide polymers include cellulose ethers containing quaternary nitrogen (e.g., as described in U.S. Patent No. 3,962,418) and copolymers of etherified cellulose and starch (e.g., as described in U.S. Patent No. 3,958,581). Examples of such materials include Dow's LR and JR series polymer, commonly referred to in the industry (CTFA) as Polyquaternium-10. A particularly suitable type of cationic polysaccharide polymer that can be used is a cationic derivative of guar gum, such as guar hydroxypropyltrimethylammonium chloride (commercially available from Rhodia in its series of 1282505 of 26 JAGUAR trademarks). Examples of such materials are JAGUAR C13S, JAGUAR C14, and JAGUAR C17. Mixtures of any of the above cationic polymers can be used. The cationic polymer will generally be present in a shampoo composition for use in the invention in amounts from 0.01 to 5%, preferably from 0.02 to 1%, more preferably from 0.05 to 0.8% by total weight of cationic polymer based on the total weight of the composition. Preferably, the composition of the invention, particularly an aqueous shampoo composition for use in the invention, further comprises a suspending agent. Suitable suspending agents are selected from polyacrylic acids, crosslinked polymers of acrylic acid, copolymers of acrylic acid with a hydrophobic monomer, copolymers of monomers containing carboxylic acid and acrylic esters, crosslinked copolymers of acrylic acid and acrylate esters, heteropolysaccharide gums, and crystalline long-chain acyl derivatives. 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 distearate 3 are preferred long-chain acyl derivatives because they impart pearlescence to the composition.Polyacrylic acid is commercially available as Carbopol 420, Carbopol 488, or Carbopol 493. Crosslinked acrylic acid polymers can also be used. 1282505 of 26 a multifunctional agent; they 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 (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 may be used. A mixture of crosslinked acrylic acid polymer and long-chain crystalline acyl derivative is preferred. Generally, there will be a suspending agent present in a shampoo composition for use in the invention in amounts of 0.1 to 10%, preferably 0.15 to 6%, more preferably 0.2 to 4% by total weight of suspending agent based on the total weight of the composition. The cosmetic composition may optionally comprise one or more additional components, provided that the optional components are physically and chemically compatible with the essential components described above and do not unduly impair the sensory properties, rheology of the formulation, and conditioning performance. The individual concentrations of these optional components may range from 0.001% to 10%. 1282505 of 26 by weight of the total composition, preferably between 0.01% and 5% by weight. Such components may include conditioning agents, fragrances, dyes, 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. One of the preferred optional components is a suspending agent. Suitable suspending agents are selected from polyacrylic acids, crosslinked polymers of acrylic acid, copolymers of acrylic acid with a hydrophobic monomer, copolymers of monomers containing carboxylic acid and acrylic esters, crosslinked copolymers of acrylic acid 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 3 distearate are preferred long-chain acyl derivatives because they impart pearlescence 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 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... 1282505 of 26 Pemulen TR1 or Pemulen TR2. Mixtures of any of the aforementioned suspending agents may be used. A mixture of crosslinked acrylic acid polymer and long-chain crystalline acyl derivative is preferred. One example that is the most preferred is a crosslinked polyacrylate polymer. The suspending agent, if included, will generally be present in the composition in an amount of 0.01 to 5% by weight, preferably 0.1 to 2.5% by weight, more preferably 0.25 to 1% by weight. Another preferred optional component is a conditioning agent, which provides a conditioning benefit. Typically, the most popular conditioners used in cosmetic compositions are water-insoluble oily materials such as mineral oils, natural oils such as triglycerides, and silicone oils. The conditioning benefit is achieved by the oily material being deposited on the hair, forming a film that makes the hair more lubricated and less dry. Preferably, the conditioning agent is non-volatile, meaning it has a vapor pressure of less than 1000 Pa at 25°C. Preferably, the composition comprises discrete dispersed droplets of a water-insoluble conditioning agent, having a mean droplet diameter (D3,2) of less than 50 microns, preferably less than 1282505 of 26 microns, more preferably less than 15 microns, with maximum preference less than 10 microns. The mean droplet diameter (D3,2) of a water-insoluble conditioner can be measured by means of a laser light scattering technique, for example, using a Malvern Instruments 2600D particle counter. The water-insoluble conditioning agent may include a silicone-free conditioning agent comprising silicone-free fatty or oily materials, such as hydrocarbon oils, fatty esters, and mixtures thereof. Preferably, the water-insoluble conditioning agent is emulsified silicone oil. Suitable silicones include polydiorganosiloxanes, in particular polydimethylsiloxanes designated CTFA dimethicone. Also suitable for use in the compositions of this invention (especially shampoos and conditioners) are polydimethylsiloxanes having terminal hydroxyl groups, designated CTFA dimethiconol. Silicone rubbers having a slight degree of crosslinking, as described, for example, in WO 96 / 31188, are also suitable for use in the compositions of this invention. Preferably, the silicone oil comprises dimethicone, dimethiconol, or a mixture thereof. The viscosity of the emulsified silicone itself (not the emulsion or the final hair care composition) is normally at least 10,000 cSt (centi-Stokes=mm2-S-1) at 25 °C, preferably at least 60,000 cSt, more preferably at least 500,000 cSt, ideally at least 1,000,000 cSt. 1282505 of 26 Preferably, the viscosity should not exceed 109 cSt to facilitate formulation. Those skilled in the art are familiar with suitable methods for measuring the kinematic viscosity of silicone oils, such as capillary viscometers. For high-viscosity silicones, a constant-tension rheometer can be used to measure the viscosity. Suitable emulsified silicones for use in compositions are available as pre-formed silicone emulsions from silicone suppliers such as Dow Corning and GE. The use of such a pre-formed silicone emulsion is preferred for ease of processing and control of the silicone particle size. These pre-formed silicone emulsions will generally also include a suitable emulsifier and can be prepared by a chemical emulsification process such as emulsion polymerization, or by mechanical emulsification using a high-shear mixer. Examples of suitable pre-formed silicone emulsions include DC1785, DC1788, and DC7128, all available from Dow Corning. These are dimethiconol / dimethicone emulsions. Another class of silicones that can be used are functionalized silicones, such as amino-functional silicones, meaning a silicone that contains at least one primary, secondary, or tertiary amine group, or a quaternary ammonium group. Examples of suitable amino-functional silicones include polysiloxanes designated CTFA, such as amodimethicone. 1282505 of 26 Preferably, silicone emulsion droplets are mixed with certain types of high molecular weight surfactant block polymers to form silicone emulsions, as described, for example, in WO03 / 094874. A preferred form of the surfactant block polymer having polyoxypropylene and polyoxyethylene groups as the hydrophobic and hydrophilic parts respectively has formula V and is designated CTFA poloxamer, which is commercially known under the trade name Pluronic by BASF. V ) HO(CH2CH2O)x(CH(CH3)CH2O)y(CH2CH2O)x H Ideally, the average value of x in formula I is 4 or higher, preferably 8 or higher, more preferably 25 or higher, even more preferably 50 or higher, and most preferably 80 or higher. The average value of x is not usually higher than 200. Ideally, the average value of y is 25 or higher, preferably 35 or higher, more preferably 45 or higher, and most preferably 60 or higher. The average value of y is not usually higher than 100. Another preferred form of the surfactant block polymer is according to formula VI and has the designation CTFA Poloxamine. These are commercially available under the trade name Tetronic from BASF. VI) (HO(CH2CH2O)a(CH(CH3)CH2O)b)2-N-CH2-CH2-N((OCH2CH(CH3))b(OCH2CH2)a OH)2 1282505 of 26 Ideally, the average value of a is 2 or higher, preferably 4 or higher, more preferably 8 or higher, even more preferably 25 or higher, and most preferably 40 or higher. The average value of a is not usually higher than 200. Ideally, the average value of b is 6 or higher, preferably 9 or higher, more preferably 11 or higher, and most preferably 15 or higher. The average value of b is not usually higher than 50. Preferably, the surfactant block polymer is poloxamer and / or poloxamine, more preferably, the surfactant block polymer is poloxamer. Preferably, the surfactant block polymer is mixed with dimethicone. The weight ratio of dimethicone to surfactant block polymer in the mixture is preferably in the range of 2:1 to 200:1, more preferably 5:1 to 50:1, even more preferably 10:1 to 40:1, with a maximum preference of 15:1 to 30:1. The water-insoluble conditioning agent is generally present in the composition in an amount of 0.05 to 15%, preferably 0.1 to 10%, more preferably 0.5 to 8%, with maximum preference 1 to 5%, based on the total weight of the composition and including all intervals therein. The composition may preferably comprise a pearlescent agent. The preferred pearlescent agent is ethylene glycol ester as 1282505 of 26 is described in document US4885107, which is incorporated into the present invention by reference. Preferably, the ethylene glycol ester is a glycol monoester or diester, more preferably a glycol diester. Preferably, the ethylene glycol monoester or diester is an ethylene glycol monoester or diester of a C12-22 fatty acid, more preferably an ethylene glycol monoester or diester of a saturated C12-22 fatty acid. Most preferred are diesters comprising a mixture of palmitate and stearate. The amount of stearate should be in the range of approximately 10% to approximately 42% or in the range of approximately 55% to approximately 80%, with palmitate representing the remainder. The amount of stearate is preferably approximately 60% to approximately 75%, more preferably approximately 80-95%, with 100% being the most preferred. The most suitable example of a pearlescence agent is ethylene glycol distearate. The pearlescence agent may also function as a suspending agent. The amount of ethylene glycol ester may suitably be from approximately 0.5% to approximately 6%, preferably from approximately 1% to approximately 4%, by weight of the total composition. The viscosity of the composition ranges appropriately between 3,000 and 10,000 mPa.s, preferably between 4,000 and 8,000 mPa.s, more preferably between 5,000 and 7,000 mPa.s when measured using a Brookfield V2 viscometer (RTV5 spindle, 1 minute, 20 rpm) at 30 °C. 1282505 of 26 The pH of the composition of the invention preferably ranges between 3 and 9, more preferably between 4 and 8, with maximum preference between 4.5 and 6.5. Rinse-off compositions are intended to be rinsed from the user's scalp with water after use. Rinse-off compositions are preferred. A no-rinse composition should not be rinsed from the user's scalp immediately after use (i.e., within at least the first 2 hours, preferably at least 4 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 to 15 minutes, preferably between 1 minute and 10 minutes, more preferably 1 minute to 10 minutes, before rinsing. The preferred use of the cosmetic composition is in a shampoo, particularly a rinse-out shampoo. The shampoo compositions for use in the invention are generally aqueous, i.e., they have water, an aqueous solution, or a lyotropic liquid crystalline phase as their main component. Suitablely, the shampoo composition will comprise from 50 to 98%, preferably from 60 to 92%, water by weight based on the total weight of the composition. Such compositions are said to have an aqueous base. The invention will now be illustrated by the following non-limiting examples. Examples of the invention are illustrated by a number, comparative examples by a letter. 1282505 of 26 Examples The examples were prepared in accordance with Tables 1 and 3. Piroctone olamine deposition was measured by thoroughly wetting 10 clean, dark brown European hair samples (2.5 g / 15.24 cm (6 in)) with water. Five replicates were tested for each shampoo composition. 0.25 g of shampoo was applied to one sample followed by 30 seconds of massage. The sample was then rinsed with water for 30 seconds. Another 0.25 g of shampoo was applied, followed by another 30 seconds of massage. The shampoo was then rinsed with water for 30 seconds. The sample was allowed to air dry. The dried sample was extracted in 50 mL of ethanol. Care was taken to ensure that the extract was not exposed to UV light. The extract was analyzed by UPLC to determine piroctone acid deposition. Table 1 Ingredient ABCDEF SLES 12 12 12 12 12 12 CAPB 1.6 1.6 1.6 1.6 1.6 1.6 Caprylic acid 0 0 0.1 0.1 0.2 0.2 Coconut oil 0 0 0.25 0.25 0.25 0.25 Piroctone olamine 0.5 0.5 0.5 0.5 0.5 0.5 Water Up to Up to Up to Up to Up to 100 100 100 100 100 100 1282505 of 26 pH 6 4.5 6 4.5 6 4.5 Table 2 Formulation Piroctone olamine deposition A 8.64 B 9.27 C 6.04 D 9.27 E 8.08 F 9.27 Table 3 Ingredient GHIJ 1 2 SLES 8.5 8.5 8.5 8.5 8.5 8.5 CAPB 2.3 2.3 2.3 2.3 2.3 2.3 Caprylic acid 0 0 0.1 0.1 0.2 0.2 Coconut oil 0 0 0.25 0.25 0.25 0.25 Piroctone olamine 0.5 0.5 0.5 0.5 0.5 0.5 Water Up to Up to Up to Up to Up to 100 100 100 100 100 100 PH 6 4.5 6 4.5 6 4.5 1282505 of 26 Table 4 Formulation Piroctone olamine deposition (ppm) G 8.88 H 7.5 I 7.75 J 9.69 1 10.12 2 13.05 1282505 of 26 MOELLER & CO. SA - 30529767664 Digitally signed by PORTALTRAM ITES - INPI Date: 2021.02.18 10:21:29 -03:00 Reason: Digitally Signed by the INPI Location: Buenos Aires, Argentina 1282505

Claims

1. A personal cleansing composition, excluding its therapeutic uses, characterized in that it comprises: i) a cleansing surfactant comprising an amphoteric surfactant and an anionic surfactant which, if ethoxylated, has a degree of ethoxylation of less than 3, wherein the weight ratio of the anionic surfactant to the amphoteric surfactant is less than 5:1; ii) an oily phase comprising at least one triglyceride oil consisting of coconut oil; iii) an aliphatic fatty acid or a salt thereof having a carbon chain length of C4 to C10, consisting of caprylic acid or its salts; and iv) a piroctone compound; wherein the composition has a pH at 20°C of 6 or lower and the weight ratio of the aliphatic fatty acid to the triglyceride oil is 2:3 to 3:

1. Eleven claims follow.