Personal care composition and methods

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, in which the ratio of anionic surfactant to amphoteric surfactant is less than 5:1; ii) an oil phase comprising at least one triglycerideoil; iii) an aliphatic fatty acid or salt thereof having a carbon chain length from C4 to C10; and iv) a piroctone compound; in which the composition has a pH at 20°C of l6 or less and the weight ratio of aliphatic fatty acid to triglyceride oil is from 1:2 to 5:1.

Description

FORM – 2THE PATENTS ACT, 1970(39 of 1970)The Patents Rules, 2006COMPLETE SPECIFICATION(See Section 10 and Rule 13)PERSONAL CARE COMPOSITION AND METHODSUnilever Global IP Limited,a company organised and existing under the laws of England and WalesPort Sunlight, Wirral, Merseyside, CH62 4ZD, United KingdomThe following specification particularly describes the invention and the manner in which it is to be performed.J30347 (C) CPL2PERSONAL CARE COMPOSITION AND METHODSField of the Invention5 The present invention relates to a hair treatment composition, particularly an anti-dandruff shampoocomposition.Background of the InventionDandruff is a problem affecting many globally. The condition is manifested by the shedding of10 clumps of dead skin cells from the scalp, these are white in colour and provide an aestheticallydispleasing appearance. A factor that contributes to dandruff are certain members of theMalassezia yeasts. To combat these years, hair treatment compositions are developed includingvarious actives for their antidandruff effectiveness. Piroctone compound such as piroctone olamineis one such active.15A common problem with piroctone compound is that deposition of the active onto the desiredsurface during wash process is minimum. The desired surface is typically scalp and / or hair. Forexample, piroctone compound such as piroctone olamine is usually soluble in surfactants of thecleansing phase comprised in a hair treatment composition. During the excessive rinsing process,20 the majority of piroctone is likely to be washed away together with the surfactants. Poor depositionis correlated with low antidandruff activity, thus little mitigation of the ill-effects of dandruff. To date,there are attempts to offset this drawback by increasing the level of piroctone olamine in hairtreatment composition. Such approach causes a variety of issues such as increased costs,potential instability of the formulation and potential adverse effect to hair sensory. Hence it is not an25 approach favoured by the industry.US2002 / 0035161A1 describes a cosmetic / pharmaceutical oil-in-water emulsion including adiscontinuous fatty phase dispersed in a continuous aqueous phase and comprising an effectiveamount of at least one biologically active agent (A) and an effect amount of an emulsifying system30 (B) therefore, said at least one biologically active (A) being non-solubilized therein in micronizedparticulate state, at least 80%, numerically, of said micronized particles having diameters rangingfrom 1 to 10 µm and at least 50%, also numerically, having diameters of less than 5 µm.Co-pending European application number discloses enhanced deposition of Octopirox in a hair35 care composition containing a cleansing surfactant comprising an amphoteric surfactant and anethoxylated anionic surfactant at a ratio from 2:1 to 6:1.J30347 (C) CPL3Improved deposition of Octopirox in a composition comprising polyquaternium 6 is disclosed in Copending European application 11988726.4.Despite all the prior art, there remains a need to improve the deposition of piroctone compounds,5 especially piroctone acid or piroctone olamine, onto the surface of scalp and / or hair during washingprocess. There also remains a further need to improve the deposition onto said surface withoutadverse side effects to sensory, formulation rheology and conditioning performance.Description of the Invention10 The present invention relates to a personal cleansing composition comprisingi) a cleansing surfactant comprising an amphoteric surfactant and an anionic surfactant which ifethoxylated has a degree of ethoxylation of less than 3, in which the ratio of anionic surfactantto amphoteric surfactant is less than 5:1;ii) an oil phase comprising at least one liquid hydrocarbon triglyceride oil;15 iii) an aliphatic fatty acid or salt thereof having a carbon chain length from C4 to C10; andiv) a piroctone compound;in which the composition has a pH at 20oC of less 6 or less. and the weight ratio of aliphaticfatty acid to triglyceride oil is from 1:2 to 5:1.20 The invention also relates to a non-therapeutic method of treating hair or the scalp, comprisingapplication of the personal care composition described above.The invention further relates to a composition described above use in a method to mitigate dandruff.25 For the avoidance of doubt, any feature of one aspect of the present invention may be utilised in anyother aspect of the invention. Any feature described as ‘preferred’ should be understood to beparticularly preferred in combination with a further preferred feature or features. Herein, any featureof a particular embodiment may be utilized in any other embodiment of the invention. Allpercentages are weight / weight percentages unless otherwise indicated.30Detailed Description of the InventionThe piroctone compound for use in the present invention include piroctone acid, primary, secondaryand tertiary olamine salts of piroctone acid (such as the diethanolamine and triethanolamine salts),and mixtures thereof, preferably piroctone acid, primary olamine salt of piroctone acid (i.e. piroctone35 olamine, also known as Octopirox®) and mixtures thereof.J30347 (C) CPL4Piroctone Olamine is an olamine salt of the hydroxamic acid derivative piroctone. It is commonlyknown as piroctone ethanolamine with the trade name Octopirox®.The piroctone olamine according to the present invention is a 1:1 compound of 1-hydroxy-4-methyl5 6-(2,4,4-trimethylpentyl)-2(1H)-pyridinone with 2-aminoethanol and is also designated 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H) pyridinone monoethanolamine salt. The CAS number is68890-66-4 and the compound has the general formula (I) as below:(I)10The piroctone compound, particularly the piroctone olamine is preferably present from 0.01 to 5%by weight of the total composition, more preferably from 0.1 to 5 wt%, most preferably from 0.2 to3 wt%, of the total composition.15 Compositions of the invention comprise an oil phase comprising a triglyceride oil. Preferredtriglycerides comprise almond oil, coconut oil, olive oil, palm kernel oil, peanut oil and sunflower oil.Particularly preferred is coconut oil.Compositions according to the invention comprises an oil phase. It is preferable if the oil phase20 forms wormlike micelles in an aqueous continuous phase. It is preferable if the oil phase is abicontinuous phase and / or true emulsion.Preferably the total level of non-volatile hydrocarbon oil is from 0.02 to 2 wt% of the totalcomposition, more preferably from 0.05 to 1.0 wt%.25Compositions of the invention comprise an aliphatic fatty acid or salt thereof having a carbon chainlength from C4 to C10;, preferably the fatty acid or salt thereof is caprylic acid or its salt.J30347 (C) CPL5The weight ratio of aliphatic fatty acid to triglyceride is between 1:2 to 5:1, more preferably from 2:3to 3:1The composition according to the invention has a pH at 20oC 6 or less, preferably less than 6, morepreferably less than 5.5 and most preferably 5 or less. Preferably the pH at 20 5oC is greater than 3.The cosmetic composition comprises one cleansing surfactants. Surfactants are compoundswhich have hydrophilic and hydrophobic portions that act to reduce the surface tension ofthe aqueous solutions they are dissolved in. The cleansing surfactant comprises an amphoteric10 surfactant and an ethoxylated anionic surfactant in which the anionic surfactant preferably has anaverage degree of ethoxylation of less than 2.5, more preferably less than preferably less than 2 ,most preferably less than 1.5.The alkyl chain of the ethoxylated anionic surfactant is preferably from 8 to 18, more15 preferably from 10 to 16 carbon atoms and may be unsaturated. Preferred alkyl ethersulphates are those of formula (I):R-O-(CH2CH2-O)n-SO3-M+ (I)20 wherein R is a straight or branched alkyl chain having 8 to 18 (preferably 12 to 18) carbon atoms; nis the average degree of ethoxylation is 3 or greater, preferably 3 (and M is a solubilizing cationsuch as sodium, potassium, ammonium or substituted ammonium. An example is sodium laurylether sulphate (SLES). The most preferred example is SLES having an average degree ofethoxylation of 3 or greater, preferably an average degree of ethoxylation of 3, preferably the25 surfactant is sodium laureth sulphate (3EO).Preferred amphoteric or zwitterionic cleansing surfactants including; alkyl amine oxides, alkylbetaines, alkyl amidopropyl betaines, alkyl sulphobetaines (sultaines), alkyl glycinates, alkylcarboxyglycinates, alkyl amphoacetates, alkyl amphopropionates, alkylamphoglycinates,30 alkyl amidopropyl hydroxysultaines, acyl taurates and acyl glutamates, wherein the alkyl andacyl groups have from 8 to 19 carbon atoms. Preferred amphoteric surfactants include,cocodimethyl sulphopropyl betaine, lauryl betaine, coco betaine, cocamidopropyl betaineand sodium cocoamphoacetate. A particularly preferred is amphoteric surfactant iscocamidopropyl betaine.35J30347 (C) CPL6The ratio of ethoxylated anionic surfactant to amphoteric surfactant in which the ratio of anionicsurfactant to amphoteric surfactant is less than 5:1, preferably from 2:1 to 5:1, more preferably from3:1 to 4:1.5 The total amount of cleansing surfactant in a shampoo composition for use in the invention isgenerally from 3 to 35 wt%, preferably from 5 to 25 wt%, most preferably from 7 to 15 wt% of thetotal composition.Non-limiting examples of further cleansing anionic surfactants, which may be present but10 are not preferred are alkyl sulphates, alkaryl sulphonates, N-alkyl sarcosinates, alkylphosphates, alkyl ether phosphates, acyl amino acid based surfactants, alkyl ethercarboxylic acids, acyl taurates, acyl glutamates, alkyl glycinates and salts thereof, especiallytheir sodium, magnesium, ammonium and mono-, di- and triethanolamine salts. The alkyland acyl groups in the preceding list generally contain from 8 to 18, preferably from 10 to 1615 carbon atoms and may be unsaturated.Further non-limiting examples of cleansing surfactants may include non-ionic cleansingsurfactants including; aliphatic (C8 - C18) primary or secondary linear or branched chainalcohols with alkylene oxides, usually ethylene oxide and generally having from 6 to 3020 ethylene oxide groups. However, it is preferred if non-ionic cleansing surfactants are notpresent. Other representative cleansing surfactants include mono- or di-alkyl alkanolamides(examples include coco mono-ethanolamide and coco mono-isopropanolamide) and alkylpolyglycosides (APGs). Suitable alkyl polyglycosides for use in the invention arecommercially available and include for example those materials identified as: Plantapon25 1200 and Plantapon 2000 ex BASF. Other sugar-derived surfactants, which can be includedin compositions for use in the invention include the C10-C18 N-alkyl (Cl-C6) polyhydroxy fattyacid amides, such as the C12-C18 N-methyl glucamides, as described for example inWO 92 06154 and US 5 194 639, and the N-alkoxy polyhydroxy fatty acid amides, such asC10-C18 N-(3-methoxypropyl) glucamide.30The personal care composition may comprise at least one cationic deposition polymer. Suitablecationic polymers may be homopolymers which are cationically substituted or may beformed from two or more types of monomers. The weight average (Mw) molecular weight of thepolymers will generally be between 100 000 and 2 million daltons. The polymers will have35 cationic nitrogen containing groups such as quaternary ammonium or protonated aminogroups, or a mixture thereof. If the molecular weight of the polymer is too low, then theJ30347 (C) CPL7conditioning effect is poor. If too high, then there may be problems of high extensionalviscosity leading to stringiness of the composition when it is poured.The cationic nitrogen-containing group will generally be present as a substituent on a5 fraction of the total monomer units of the cationic polymer. Thus, when the polymer is not ahomopolymer it can contain spacer non-cationic monomer units. Such polymers aredescribed in the CTFA Cosmetic Ingredient Directory, 3rd edition. The ratio of the cationic tonon-cationic monomer units is selected to give polymers having a cationic charge density inthe required range, which is generally from 0.2 to 3.0 meq / gm. The cationic charge density of10 the polymer is suitably determined via the Kjeldahl method as described in the US Pharmacopoeiaunder chemical tests for nitrogen determination.Suitable cationic polymers include, for example, copolymers of vinyl monomers having cationicamine or quaternary ammonium functionalities with water soluble spacer monomers such as15 (meth)acrylamide, alkyl and dialkyl (meth)acrylamides, alkyl (meth)acrylate, vinyl caprolactone andvinyl 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, maleicanhydride, propylene glycol and ethylene glycol.20 The cationic amines can be primary, secondary or tertiary amines, depending upon the particularspecies and the pH of the composition. In general, secondary and tertiary amines, especiallytertiary, are preferred.Amine substituted vinyl monomers and amines can be polymerised in the amine form and then25 converted to ammonium by quaternization.The cationic polymers can comprise mixtures of monomer units derived from amine- and / orquaternary ammonium-substituted monomer and / or compatible spacer monomers.30 Suitable (non-limiting examples of) cationic polymers include:- cationic diallyl quaternary ammonium-containing polymers including, for example,dimethyldiallylammonium chloride homopolymer and copolymers of acrylamide anddimethyldiallylammonium chloride, referred to in the industry (CTFA) as Polyquaternium 6and Polyquaternium 7, respectively;35 - mineral acid salts of amino-alkyl esters of homo-and co-polymers of unsaturated carboxylicacids having from 3 to 5 carbon atoms, (as described in U.S. Patent 4,009,256);J30347 (C) CPL8- cationic polyacrylamides(as described in WO95 / 22311).Other cationic polymers that can be used include cationic polysaccharide polymers, such as cationiccellulose derivatives, cationic starch derivatives, and cationic guar gum derivatives.5Cationic polysaccharide polymers suitable for use in compositions for use in the invention includemonomers of the formula:A-O-[R-N+(R1)(R2)(R3)X-],10wherein: A is an anhydroglucose residual group, such as a starch or cellulose anhydroglucoseresidual. R is an alkylene, oxyalkylene, polyoxyalkylene, or hydroxyalkylene group, or combinationthereof. R1, R2 and R3independently represent alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, oralkoxyaryl groups, each group containing up to about 18 carbon atoms. The total number of carbonatoms for each cationic moiety (i.e., the sum of carbon atoms in R1, R2 and R3 15 ) is preferably about20 or less, and X is an anionic counterion.Another type of cationic cellulose includes the polymeric quaternary ammonium salts ofhydroxyethyl cellulose reacted with lauryl dimethyl ammonium-substituted epoxide, referred to in the20 industry (CTF A) as Polyquaternium 24. These materials are available from the AmercholCorporation, for instance under the tradename Polymer LM-200.Other suitable cationic polysaccharide polymers include quaternary nitrogen-containing celluloseethers (e.g. as described in U.S. Patent 3,962,418), and copolymers of etherified cellulose and starch25 (e.g. as described in U.S. Patent 3,958,581). Examples of such materials include the polymer LR andJR series from Dow, generally referred to in the industry (CTFA) as Polyquaternium 10.A particularly suitable type of cationic polysaccharide polymer that can be used is a cationicguar gum derivative, such as guar hydroxypropyltrimethylammonium chloride (commerciallyavailable from Rhodia in their JAGUAR trademark series). Examples of such materials areJAGUAR C13S, JAGUAR C14 and JAGUAR C17.Mixtures of any of the above cationic polymers may be used.30J30347 (C) CPL9Cationic polymer will generally be present in a shampoo composition for use in the inventionat levels of 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.5 Preferably the composition of the invention, particularly an aqueous shampoo composition for use inthe invention further comprises a suspending agent. Suitable suspending agents are selected frompolyacrylic acids, cross-linked polymers of acrylic acid, copolymers of acrylic acid with ahydrophobic monomer, copolymers of carboxylic acid-containing monomers and acrylic esters,cross-linked copolymers of acrylic acid and acrylate esters, heteropolysaccharide gums and10 crystalline long chain acyl derivatives. The long chain acyl derivative is desirably selected fromethylene glycol stearate, alkanolamides of fatty acids having from 16 to 22 carbon atoms andmixtures thereof. Ethylene glycol distearate and polyethylene glycol 3 distearate are preferred longchain acyl derivatives, since these impart pearlescence to the composition. Polyacrylic acid isavailable commercially as Carbopol 420, Carbopol 488 or Carbopol 493. Polymers of acrylic acid15 cross-linked with a polyfunctional agent may also be used; they are available commercially asCarbopol 910, Carbopol 934, Carbopol 941 and Carbopol 980. An example of a suitablecopolymer of a carboxylic acid containing monomer and acrylic acid esters is Carbopol 1342. AllCarbopol (trademark) materials are available from Goodrich.20 Suitable cross-linked polymers of acrylic acid and acrylate esters are Pemulen TR1 or PemulenTR2. A suitable heteropolysaccharide gum is xanthan gum, for example that available as Kelzanmu.Mixtures of any of the above suspending agents may be used. Preferred is a mixture of cross25 linked polymer of acrylic acid and crystalline long chain acyl derivative.Suspending agent will generally be present in a shampoo composition for use in theinvention at levels of from 0.1 to 10%, preferably from 0.15 to 6%, more preferably from 0.2to 4% by total weight of suspending agent based on the total weight of the composition.30The cosmetic composition may optionally comprise one or more components, provided that theoptional components are physically and chemically compatible with the essential componentsdescribed hereinbefore, and do not otherwise unduly impair sensory, formulation rheology andconditioning performance. Individual concentrations of such optional components may range from35 0.001% to 10% by weight of the total composition, preferably from 0.01% to 5%wt%. Suchcomponents may include conditioning agents, fragrance, dyes, pigments, pH adjusting agents,J30347 (C) CPL10pearlescers or opacifiers, viscosity modifiers, preservatives, and natural hair nutrients such asbotanicals, fruit extracts, sugar derivatives and amino acids.One of the preferred optional components is a suspending agent. Suitable suspending5 agents are selected from polyacrylic acids, cross-linked polymers of acrylic acid, copolymersof acrylic acid with a hydrophobic monomer, copolymers of carboxylic acid-containingmonomers and acrylic esters, cross-linked copolymers of acrylic acid and acrylate esters,heteropolysaccharide gums and crystalline long chain acyl derivatives. The long chain acylderivative is desirably selected from ethylene glycol stearate, alkanolamides of fatty acids10 having from 16 to 22 carbon atoms and mixtures thereof. Ethylene glycol distearate andpolyethylene glycol 3 distearate are preferred long chain acyl derivatives, since these impartpearlescence to the composition. Polyacrylic acid is available commercially as Carbopol420, Carbopol 488 or Carbopol 493. Polymers of acrylic acid cross-linked with apolyfunctional agent may also be used; they are available commercially as Carbopol 910,15 Carbopol 934, Carbopol 941 and Carbopol 980. An example of a suitable copolymer of acarboxylic acid containing monomer and acrylic acid esters is Carbopol 1342. All Carbopol(trademark) materials are available from Goodrich. Suitable cross-linked polymers of acrylicacid and acrylate esters are Pemulen TR1 or Pemulen TR2.20 Mixtures of any of the above suspending agents may be used. Preferred is a mixture ofcross-linked polymer of acrylic acid and crystalline long chain acyl derivative.A most preferred example is a crosslinked polyacrylate polymer.25 Suspending agent, if included, will generally be present in the composition at a level of from0.01 to 5 wt.%, preferably from 0.1 to 2.5 wt.%, more preferably from 0.25 to 1 wt.%.Another preferred optional component is a conditioning agent, providing conditioning benefit.Typically, the most popular conditioning agents used in cosmetic compositions are water-insoluble30 oily materials such as mineral oils, naturally occurring oils such as triglycerides and silicone oils.Conditioning benefit is achieved by the oily material being deposited onto the hair resulting in theformation of a film, which makes the hair more lubricated and less dry. Preferably, the conditioningagent is non-volatile, meaning that it has a vapour pressure of less than 1000 Pa at 25oC.35 Preferably, the composition comprises discrete dispersed droplets of a water-insoluble conditioningagent, which has a mean droplet diameter (D3,2) of less than 50 microns, preferably less thanJ30347 (C) CPL1130 microns, more preferably less than15 microns, most preferably less than 10 microns. The meandroplet diameter (D3,2) of a water-insoluble conditioning agent may be measured by means of alaser light scattering technique, for example using a 2600D Particle Sizer from Malvern Instruments.The water-insoluble conditioning agent may include non-silicone conditioning agent comprising non5 silicone oily or fatty 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 which have theCTFA designation dimethicone. Also suitable for use in compositions of this invention (particularly10 shampoos and conditioners) are polydimethyl siloxanes having hydroxyl end groups, which havethe CTFA designation dimethiconol. Also suitable for use in compositions of this invention aresilicone gums having a slight degree of cross-linking, as are described for example inWO 96 / 31188. Preferably, the silicone oil comprises dimethicone, dimethiconol or a mixturethereof.15The viscosity of the emulsified silicone itself (not the emulsion or the final hair care composition) istypically at least 10,000 cSt (centi-Stokes=mm2·S-1) at 25oC, preferably at least 60,000 cSt, mostpreferably at least 500,000 cSt, ideally at least 1,000,000 cSt. Preferably the viscosity does notexceed 109 cSt for ease of formulation. Suitable methods for measuring the kinematic viscosity of20 silicone oils are known to those skilled in the art, e.g. capillary viscometers. For high viscositysilicones, a constant stress rheometer can be used to measure viscosity.Suitable emulsified silicones for use in the compositions are available as pre-formed siliconeemulsions from suppliers of silicones such as Dow Corning and GE silicones. The use of such pre25 formed silicone emulsion is preferred for ease of processing and control of silicone particle size.Such pre-formed silicone emulsions will typically additionally comprise a suitable emulsifier and maybe prepared by a chemical emulsification process such as emulsion polymerisation, or bymechanical emulsification using a high shear mixer.30 Examples of suitable pre-formed silicone emulsions include DC1785, DC1788, DC7128, allavailable from Dow Corning. These are emulsions of dimethiconol / dimethicone.Another class of silicones which may be used are functionalized silicones such as amino functionalsilicones, meaning a silicone containing at least one primary, secondary or tertiary amine group, or a35 quaternary ammonium group. Examples of suitable amino functional silicones include polysiloxaneshaving the CTFA designation “amodimethicone.”J30347 (C) CPL12Preferably, silicone emulsion droplets are blended with certain types of surface active blockpolymers of a high molecular weight to form silicone emulsions, as described for example inWO03 / 094874. One preferred form of the surface active block polymer having polyoxypropyleneand polyoxyethylene groups as the hydrophobic and hydrophilic part respectively has formula V5 and has the CTFA designation poloxamer, known commercially under the trade name “Pluronic”from BASF.V ) HO(CH2CH2O)x(CH(CH3)CH2O)y(CH2CH2O)x H10 Suitably, the mean value of x in formula I is 4 or more, preferably 8 or more, more preferably 25 ormore, yet more preferably 50 or more and most preferably 80 or more. The mean value of x istypically no greater than 200. Suitably, the mean value of y is 25 or more, preferably 35 or more,more preferably 45 or more and most preferably 60 or more. The mean value of y is typically nogreater than 100.15Another preferred form of the surface active block polymer is according to formula VI and has theCTFA designation Poloxamine. Those are commercially available under the trade name “Tetronic”from BASF.20 VI) (HO(CH2CH2O)a(CH(CH3)CH2O)b)2-N-CH2-CH2-N-((OCH2CH(CH3))b(OCH2CH2)a OH)2Suitably, the mean value of a is 2 or more, preferably 4 or more, more preferably 8 or more, evenmore preferably 25 or more and most preferably 40 or more. The mean value of a is typically nogreater than 200. The mean value of b is suitably 6 or more, preferably 9 or more, more preferably25 11 or more and most preferably 15 or more. The mean value of b is typically no greater than 50.Preferably, the surface active block polymer is poloxamer and / or poloxamine, more preferably, thesurface active block polymer is poloxamer.30 Preferably, the surface active block polymer is blended with dimethicone. The weight ratio ofdimethicone to surface active block polymer in the blend is preferably in the range from 2:1 to 200:1,more preferably from 5:1 to 50:1, even more preferably from 10:1 to 40:1, most preferably from 15:1to 30:1.J30347 (C) CPL13The water-insoluble conditioning agent is generally present in the composition in an amount from0.05 to 15%, preferably from 0.1 to 10%, more preferably from 0.5 to 8%, most preferably from 1 to5%, based on the total weight of the composition and including all ranges subsumed therein.5 The composition may preferably comprise a pearlescer. The preferred pearlescer is ethylene glycolester as disclosed in US4885107, incorporated herein by reference. Preferably, the ethylene glycolester is a mono- or, di-ester of glycol, more preferably a di-ester of glycol.Preferably ethylene glycol mono- or di-ester is an ethylene glycol mono- or di-ester of a C12-22 fatty10 acid, more preferably an ethylene glycol mono- or di-ester of a saturated C12-22 fatty acid. Mostpreferred are the diesters comprising a mixture of palmitate and stearate. The amount of stearateshould be in the range of about 10% to about 42% or in the range of about 55% to about 80% withpalmitate accounting for the remainder. The amount of stearate is preferably from about 60% toabout 75%, more preferably from about 80-95%, most preferably 100%. The most suitable15 example of a pearlescer is an ethylene glycol distearate. Pearlescer may also perform the functionas a suspending agent.The level of the ethylene glycol ester can be suitably from about 0.5% to about 6%, preferably fromabout 1% to about 4%, by weight of the total composition.20The viscosity of the composition s suitably ranges from 3,000 to 10,000 mPa.s, preferablyfrom 4,000 to 8,000 mPa.s, more preferably from 5,000 to 7,000 mPa.s when measuredusing a Brookfield V2 viscometer (spindle RTV5, 1 minute, 20rpm) at 30°C.25 The pH of the composition of the invention preferably ranges from 3 to 9, more preferably from 4 to8, most preferably from 4.5 to 6.5.Rinse-off compositions are intended to be rinsed off the scalp of the user with water after use. Rinseoff compositions are preferred. Leave-on composition is intended not to be rinsed off the scalp of30 the user immediately after use (i.e. within at least the first 2 hours, preferably at least 4 hours afterapplication of the composition). In the context of the present invention rinse-off compositionsinclude shampoos and conditioners, as well as treatment compositions which can be left on scalpfor from 0.5 minute to up to 15 minutes, preferably from 1 minute to 10 minutes, more preferably 1minutes to 10 minutes, prior to being rinsed off.35J30347 (C) CPL14The preferred use of the cosmetic composition is in a shampoo, particularly a rinse off shampoo.Shampoo compositions for use in the invention are generally aqueous, i.e. they have water or anaqueous solution or a lyotropic liquid crystalline phase as their major component. Suitably, theshampoo composition will comprise from 50 to 98%, preferably from 60 to 92% water by weight5 based on the total weight of the composition. Such compositions are referred to as having anaqueous base.The invention will now be illustrated by the following non-limiting Examples. Examples of theinvention are illustrated by a number, comparative Examples by a letter,10ExamplesExamples were prepared according to tables 1 and 3.The deposition of the piroctone olamine was measured by thoroughly wetting with water 10 clean,15 dark-brown European hair switches (2.5g / 6’’). 5 replicas were tested for each shampoocomposition. 0.25g shampoo was applied to one switch followed by 30 second massage. Theswitch was then rinsed by water for 30 seconds. 0.25g shampoo was re-applied followed byanother 30 second massage. The shampoo was then rinsed off by water for 30 seconds. Theswitch was allowed to dry naturally. The dried switch was extracted in 50ml ethanol. Caution was20 taken not to expose the extraction to UV light. The extraction was analysed by UPLC for piroctoneacid deposition.Table 1Ingredient A B C D E FSLES 12 12 12 12 12 12CAPB 1.6 1.6 1.6 1.6 1.6 1.6Caprylic Acid 0 0 0.1 0.1 0.2 0.2Coconut oil 0 0 0.25 0.25 0.25 0.25Piroctone Olamine 0.5 0.5 0.5 0.5 0.5 0.5Water To 100 To 100 To 100 To 100 To 100 To 100pH 6 4.5 6 4.5 6 4.525J30347 (C) CPL15Table 2Formulation Piroctone Olamine DepositionA 8.64B 9.27C 6.04D 9.27E 8.08F 9.275 Table 3Ingredient G H I J 1 2SLES 8.5 8.5 8.5 8.5 8.5 8.5CAPB 2.3 2.3 2.3 2.3 2.3 2.3CaprylicAcid0 0 0.1 0.1 0.2 0.2Coconut oil 0 0 0.25 0.25 0.25 0.25PiroctoneOlamine0.5 0.5 0.5 0.5 0.5 0.5Water To 100 To 100 To 100 To 100 To 100 To 100pH 6 4.5 6 4.5 6 4.5Table 410Formulation Piroctone Olamine Deposition (ppm)G 8.88H 7.5I 7.75J 9.691 10.122 13.05J30347 (C) CPL

Claims

WE CLAIM :

1. A personal cleansing composition comprising:i) a cleansing surfactant comprising an amphoteric surfactant and an anionic surfactant which if5 ethoxylated has a degree of ethoxylation of less than 3, in which the weight ratio of anionicsurfactant to amphoteric surfactant is less than 5:1;ii) an oil phase comprising at least one triglyceride oil, consisting of coconut oil;iii) an aliphatic fatty acid or salt thereof having a carbon chain length from C4 to C10, consisting ofcaprylic acid or salt thereof; and10 iv) a piroctone compound;in which the composition has a pH at 20°C of 6 or less and the weight ratio of aliphatic fatty acid totriglyceride oil is from 2:3 to 3:1.

2. A personal cleansing composition according to claim 1 in which the pH of the composition is less15 than 6, preferably less than 5.5.

3. A personal care composition in which the oii phase forms wormiike micelles in an aqueouscontinuous phase.20 4. A personal care composition according to claim 1 or claim 2 in which the cleansing surfactant isan ethoxylated alkyi sulphate a degree of ethoxylation of less than 2.

5. A personal care composition according to claim 4 in which the ethoxylated alkyl sulphate issodium laureth sulphate (1EO).

256. A personal composition according to any preceding in which the piroctone compound is piroctoneolamine.

7. A personal care composition according to according to any preceding claim which further30 comprises a cationic polymer,8. A personal care composition according to any preceding claim that comprises a total cleansingsurfactant level from 3 to 35 wt%, preferably from 5 to 25 wt%, most preferably from 7 to 15 wt% ofthe total composition.J30347 (C) CPL179. A personal care composition according to any preceding claim that comprises a total level ofpiroctone compound from 0.1 to 5 wt%, preferably from 0.2 to 3 wt%, of the total composition.5 10. A personal care composition according to any preceding claim in which the total level of coconutoil is from 0.05 to 1.0 wt% of the total composition.

11. A personal care composition according to any preceding claim that is a shampoo.10 12. A non-therapeutic method of treating hair or the scalp, comprising application of a personal carecomposition according to any of claims 1 to 10, to the hair or scalp.

13. A non-therapeutic method according claim 11 in which the composition is washed off after use.

14. A composition described in any one of claims 1 to 10 use in a method to mitigate dandruff.