Personal Care Compositions and Methods

Abstract

1. A personal cleansing composition comprising: (i) a cleansing surfactant comprising an amphoteric surfactant and an anionic surfactant, wherein the anionic surfactant, if ethoxylated, has a degree of ethoxylation of less than 3, wherein the ratio of anionic surfactant to amphoteric surfactant is less than 5:1; (ii) an oil phase comprising at least one triglyceride oil; and (iii) a C4 to C6 triglyceride oil. 10 and (iv) a piroctone compound; wherein the composition has a pH of 6 or less at 20°C, and the weight ratio of the aliphatic fatty acid to the triglyceride oil is 1:2 to 5:1.

Description

[Technical Field]

[0001] This invention relates to hair treatment compositions, and more particularly to anti-dandruff shampoo compositions. [Background technology]

[0002] Dandruff is a problem that affects many people around the world. This condition manifests as clumps of dead skin cells shedding from the scalp, which are white in color and give an aesthetically unpleasant appearance. One contributing factor to dandruff is certain members of Malassezia yeast. To combat these yeasts, hair treatment compositions containing various active substances for anti-dandruff effects have been developed. Piroctone compounds, such as piroctone olamine, are one such active substance.

[0003] A common problem associated with piroctone compounds is minimizing the adhesion of the active substance to the desired surface during the cleansing process. This desired surface is typically the scalp and / or hair. For example, piroctone compounds such as piroctone olamine are usually soluble in the surfactants of the cleansing phase in hair treatment compositions. During excessive rinsing, a large portion of the piroctone can be washed away along with the surfactant. Low adhesion correlates with low anti-dandruff activity, and therefore, the harmful effects of dandruff are hardly mitigated. To date, attempts have been made to compensate for this drawback by increasing the level of piroctone olamine in hair treatment compositions. Such approaches lead to various problems, including increased costs, potential instability of the formulation, and potential adverse effects on hair feel. Therefore, it is not a desirable approach for the industry.

[0004] US2002 / 0035161A1 describes an oil-in-water emulsion for cosmetic / pharmaceuticals comprising a discontinuous fatty phase dispersed in a continuous aqueous phase and containing an effective amount of at least one biological agent (A) and an effective amount of an emulsifying system (B). Thus, the at least one biological agent (A) is insolubilized therein in the form of finely ground particles, wherein numerically at least 80% of the finely ground particles have a diameter in the range of 1 to 10 μm, and similarly, numerically at least 50% have a diameter of less than 5 μm.

[0005] A concurrently pending European application number discloses enhanced adhesion 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.

[0006] Improved adhesion of octopirox in compositions containing polyquaternium-6 is disclosed in concurrently pending European application 11988726.4.

[0007] Despite all prior art, there remains a need to improve the adhesion of piroctone compounds (particularly piroctonic acid or piroctone olamine) to the surface of the scalp and / or hair during the washing process. Furthermore, there remains a need to improve this adhesion without adversely affecting the feel, formulation rheology, and conditioning performance. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] US2002 / 0035161A1 [Overview of the project]

[0009] The present invention (i) A cleansing surfactant comprising an amphoteric surfactant and an anionic surfactant (where the anionic surfactant, 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 oil phase containing at least one type of liquid hydrocarbon triglyceride oil; (iii) C4~C 10 Aliphatic fatty acids or salts thereof having the carbon chain length; and, (iv) Piroctone compounds; The present invention relates to a personal cleansing composition comprising the above, wherein the composition has a pH of 6 or less at 20°C, and the weight ratio of aliphatic fatty acids to triglyceride oil is 1:2 to 5:1.

[0010] The present invention also relates to a non-therapeutic method for treating hair or scalp, wherein the method includes applying the personal care composition described above.

[0011] The present invention also relates to the use of the above composition in a method for reducing dandruff.

[0012] To avoid any doubt, any feature of one aspect of the present invention may also be used in any other aspect of the present invention. Any feature described as “preferred” should be understood as particularly preferred in combination with one or more further preferred features. Hereinafter, any feature of a particular embodiment may also be used in any other embodiment of the present invention. All percentages are by weight / weight percentage unless otherwise indicated. [Modes for carrying out the invention]

[0013] The piroctone compounds for use in the present invention include piroctone acid, primary, secondary and tertiary olamine salts of piroctone acid (e.g., diethanolamine salt and triethanolamine salt), and mixtures thereof. Preferably, there are piroctone acid, primary olamine salts of piroctone acid (i.e., piroctone olamine, which is also known as Octopirox®).

[0014] Piroctone olamine is an olamine salt of the hydroxamic acid derivative piroctone. It is generally known as piroctone ethanolamine having the trade name Octopirox®.

[0015] The piroctone olamine according to the present invention is a 1:1 compound of 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)-pyridinone and 2-aminoethanol, and is also referred to as 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)pyridinone monoethanolamine salt. The CAS number is 68890-66-4, and the compound is represented by the following general formula (I):

Chemical formula

[0016] The piroctone compound, particularly piroctone olamine, is preferably present at 0.01 to 5% by weight of the whole composition, more preferably at 0.1 to 5% by weight of the whole composition, and most preferably at 0.2 to 5% by weight.

[0017] The composition of the present invention contains an oil phase containing triglyceride oil. Preferred triglycerides include almond oil, coconut oil, olive oil, palm kernel oil, peanut oil and sunflower oil. Coconut oil is particularly preferred.

[0018] The composition according to the present invention comprises an oil phase. Preferably, the oil phase forms worm-like micelles in an aqueous continuous phase. Preferably, the oil phase is a cocontinuous phase and / or a true emulsion.

[0019] Preferably, the total level of non-volatile hydrocarbon oil is 0.02 to 2% by weight of the whole composition, and more preferably 0.05 to 1.0% by weight.

[0020] The composition of the present invention is C4~C 10 It contains an aliphatic fatty acid or a salt thereof having a carbon chain length, and preferably, the fatty acid or salt thereof is caprylic acid or a salt thereof.

[0021] The weight ratio of aliphatic fatty acids to triglycerides is 1:2 to 5:1, more preferably 2:3 to 3:1.

[0022] The composition according to the present invention has a pH of 6 or less, preferably less than 6, more preferably less than 5.5, and most preferably 5 or less at 20°C. Preferably, the pH at 20°C is greater than 3.

[0023] The cosmetic composition contains one cleansing surfactant. A surfactant is a compound having hydrophilic and hydrophobic moieties that act to reduce the surface tension of the aqueous solution in which they are dissolved. The cleansing surfactant includes amphoteric surfactants and ethoxylated anionic surfactants, wherein the anionic surfactant preferably has an average degree of ethoxylation of less than 2.5, more preferably less than 2, and most preferably less than 1.5.

[0024] The alkyl chain of the ethoxylated anionic surfactant preferably has 8 to 18 carbon atoms, more preferably 10 to 16 carbon atoms, and may be unsaturated. A preferred alkyl ether sulfate is given by formula (I): [ka]

[0025] The alkyl ether sulfate is represented by , where R is a linear or branched alkyl chain having 8 to 18 (preferably 12 to 18) carbon atoms; n is an average ethoxylation degree of 3 or higher, 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 having an average ethoxylation degree of 3 or higher, preferably 3, and preferably the surfactant is sodium laureth sulfate (3EO).

[0026] Preferred amphoteric or zwitterionic cleansing surfactants include alkylamine oxide, alkyl betaine, alkylamidopropyl betaine, alkyl sulfobetaine (sultaine), alkyl glycinate, alkyl carboxyglycinate, alkyl amphoacetate, alkyl amphopropionate, alkyl amphoglycinate, alkylamidopropyl hydroxysultaine, acyl taurate, and acyl glutamate, where the alkyl and acyl groups have 8 to 19 carbon atoms. Preferred amphoteric surfactants include cocodimethylsulfopropyl betaine, lauryl betaine, cocobetaine, cocamidopropyl betaine, and sodium cocoamphoacetate. A particularly preferred amphoteric surfactant is cocamidopropyl betaine.

[0027] This is a ratio of ethoxylated anionic surfactant to amphoteric surfactant where the ratio of anionic surfactant to amphoteric surfactant is less than 5:1 (preferably 2:1 to 5:1, more preferably 3:1 to 4:1).

[0028] The total amount of cleansing surfactants in the shampoo composition for use in the present invention is generally 3 to 35% by weight of the total composition, preferably 5 to 25% by weight, and most preferably 7 to 15% by weight.

[0029] Additional non-limiting examples of cleansing anionic surfactants, which may be present but are not preferred, include alkyl sulfates, alkali aryl sulfonates, N-alkyl sarcosinates, alkyl phosphates, alkyl ether phosphates, surfactants based on acyl amino acids, alkyl ether carboxylic acids, acyl taurates, acyl glutamates, alkyl glycineates and their salts, particularly their sodium salts, magnesium salts, ammonium salts and mono-, di- and triethanolamine salts. The alkyl and acyl groups in the aforementioned list generally contain 8 to 18, preferably 10 to 16 carbon atoms and may be unsaturated.

[0030] Further non-limiting examples of cleansing surfactants include nonionic cleansing surfactants such as the following: aliphatic (C8-C 18 ) primary or secondary linear or branched alcohols having an alkylene oxide (which is usually ethylene oxide and generally has 6 to 30 ethylene oxide groups). However, it is preferred that no nonionic cleansing surfactant is present. Other representative cleansing surfactants include mono- or di-alkyl alkanolamides (which include, for example, coco monoethanolamide and coco monoisopropanolamide) and alkyl polyglycosides (APGs). Alkyl polyglycosides suitable for use in the present invention are commercially available and include, for example, materials identified as Plantapon 1200 and Plantapon 2000 from BASF. Other sugar-derived surfactants that can be included in the composition for use in the present invention include C 10 -C 18 N-alkyl (C1-C6) polyhydroxy fatty acid amides (e.g., C 12 -C 18 N-methyl glucamide, which is described, for example, in WO9206154 and US5194639) and N-alkoxy polyhydroxy fatty acid amides (e.g., C 10 -C 18Examples include N-(3-methoxypropyl)glucamide.

[0031] The personal care composition may contain at least one cationic adhesive polymer. A suitable cationic polymer may be a cationic-substituted homopolymer or may be formed from two or more types of monomers. The weight average (M) of the polymer w The molecular weight is generally between 100,000 and 2,000,000 Daltons. The polymer has cationic nitrogen-containing groups such as quaternary ammonium or protonated amino groups or mixtures thereof. If the molecular weight of the polymer is too low, the conditioning effect will be poor. If it is too high, a problem of high extensional viscosity may occur, resulting in stringiness of the composition when it is poured.

[0032] Cationic nitrogen-containing groups generally exist as substituents on some of the total monomer units of the cationic polymer. Therefore, if the polymer is not a homopolymer, it may contain spacer non-cationic monomer units. Such polymers are listed in the "CTFA Cosmetic Ingredient Directory, 3rd edition." The ratio of cationic to non-cationic monomer units is selected to give the polymer a cation charge density within the required range (which is generally 0.2–3.0 meq / gm). The cation charge density of the polymer is appropriately measured by the Kjeldahl method under chemical testing for nitrogen measurement, as described in the United States Pharmacopeia.

[0033] Suitable cationic polymers include, for example, copolymers of vinyl monomers having cationic amine functional groups or quaternary ammonium functional groups and water-soluble spacer monomers (e.g., (meth)acrylamide, alkyl and dialkyl(meth)acrylamide, alkyl(meth)acrylate, vinylcaprolactone, and vinylpyrrolidine). The alkyl and dialkyl-substituted monomers preferably have C1-C7 alkyl groups, and more preferably C 1-3It has an alkyl group. Other suitable spacers include vinyl esters, vinyl alcohols, maleic anhydride, propylene glycol, and ethylene glycol.

[0034] The cationic amine can be a primary, secondary, or tertiary amine, depending on the specific species and pH of the composition. Generally, secondary and tertiary amines are preferred, and tertiary amines are particularly preferred.

[0035] Amine-substituted vinyl monomers and amines can be polymerized in amine form and then converted to ammonium by quaternization.

[0036] The cationic polymer may include a mixture of monomer units derived from amine-substituted monomers and / or quaternary ammonium-substituted monomers and / or compatible spacer monomers.

[0037] Suitable cationic polymers (non-exclusive examples) include the following: • Cationic diallyl quaternary ammonium-containing polymers, such as dimethyldiallylammonium chloride homopolymers and copolymers of acrylamide and dimethyldiallylammonium chloride, are referred to in the CTFA as polyquaternium-6 and polyquaternium-7, respectively; • Mineral salts of amino-alkyl 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 polyacrylamide (as described in WO95 / 22311).

[0038] Other cationic polymers that can be used include cationic polysaccharide polymers, such as cationic cellulose derivatives, cationic starch derivatives, and cationic guar gum derivatives.

[0039] A cationic polysaccharide polymer suitable for use in the compositions used in the present invention is given by formula: [ka]

[0040] It contains monomers represented by , where A is an anhydroglucose residue, such as starch or cellulose anhydroglucose residue. R is an alkylene, oxyalkylene, polyoxyalkylene, or hydroxyalkylene group or a combination thereof. 1 , R 2 and R 3 R independently represents an alkyl, aryl, alkylaryl, arylalkyl, alkoxyalkyl, or alkoxyaryl group, where each group contains up to approximately 18 carbon atoms. The total number of carbon atoms in each cationic moiety (i.e., R) 1 , R 2 and R 3 The total number of carbon atoms in the compound is preferably about 20 or less, and X is an anionic counterion.

[0041] Another type of cationic cellulose is the high molecular weight quaternary ammonium salt of hydroxyethyl cellulose reacted with lauryldimethylammonium substituted epoxide, which is known as polyquaternium-24 in the CTFA (Conventional Chemical and Facilitative Association). These materials can be obtained, for example, from Amerchol Corporation under the trade name Polymer LM-200.

[0042] Other suitable cationic polysaccharide polymers include quaternary nitrogen-containing cellulose ethers (e.g., described in U.S. Patent No. 3,962,418) and copolymers of etherified cellulose and starch (e.g., described in U.S. Patent No. 3,958,581). Examples of such materials include Dow's LR and JR series polymers, which are commonly referred to as polyquaternium-10 in the CTFA (Construction and Technology Association).

[0043] Particularly suitable types of cationic polysaccharide polymers that can be used are cationic guar gum derivatives, such as guar hydroxypropyltrimethylammonium chloride (commercially available from Rhodia under the JAGUAR trademark series). Examples of such materials are JAGUAR C13S, JAGUAR C14, and JAGUAR C17.

[0044] A mixture of any of the above cationic polymers can be used.

[0045] In general, the cationic polymer is present in the shampoo composition for use in the present invention at a level of 0.01 to 5%, preferably 0.02 to 1%, and more preferably 0.05 to 0.8%, based on the total weight of the composition.

[0046] Preferably, the compositions of the present invention, in particular the aqueous shampoo compositions for use in the present invention, further contain a suspending agent. Suitable suspending agents are selected from polyacrylic acid, crosslinked polymers of acrylic acid, copolymers of acrylic acid and hydrophobic monomers, copolymers of carboxylic acid-containing monomers and acrylic acid esters, crosslinked copolymers of acrylic acid and acrylic acid esters, heteropolysaccharide gums, and crystalline long-chain acyl derivatives. The long-chain acyl derivatives are preferably selected from ethylene glycol stearate, alkanolamides of fatty acids having 16 to 22 carbon atoms, and mixtures thereof. Ethylene glycol distearate and polyethylene glycol 3-distearate are preferred long-chain acyl derivatives because they impart a pearlescent luster to the composition. Polyacrylic acid is commercially available as Carbopol 420, Carbopol 488, or Carbopol 493. Polymers of acrylic acid crosslinked with polyfunctional agents can also be used. These are commercially available as Carbopol 910, Carbopol 934, Carbopol 941, and Carbopol 980. A suitable copolymer of carboxylic acid-containing monomers and acrylic acid esters is Carbopol 1342. All Carbopol® materials are available from Goodrich.

[0047] Suitable crosslinking polymers for acrylic acid and acrylic acid esters are Pemulen TR1 or Pemulen TR2. Suitable heteropolysaccharide gums are xanthan gums, such as Kelzan mu, which are available.

[0048] A mixture of any of the above suspending agents can be used. Preferably, it is a mixture of a crosslinked polymer of acrylic acid and a crystalline long-chain acyl derivative.

[0049] The suspending agent is generally present in the shampoo composition for use in the present invention at a level of 0.1 to 10%, preferably 0.15 to 6%, and more preferably 0.2 to 4%, based on the total weight of the suspending agent, according to the total weight of the composition.

[0050] The cosmetic composition may optionally contain one or more components, provided that such components are physically and chemically compatible with the aforementioned essential components and do not otherwise excessively impair the sensation, formulation rheology, and conditioning properties. The individual concentrations of such components may range from 0.001% to 10% by weight of the total composition, preferably from 0.01% to 5% by weight. Such components may include conditioning agents, fragrances, dyes, pigments, pH adjusters, pearlescent or opaque agents, viscosity modifiers, preservatives, and natural hair nutrients, such as plant and fruit extracts, sugar derivatives, and amino acids.

[0051] One of the preferred optional components is a suspending agent. Suitable suspending agents are selected from polyacrylic acid, crosslinked polymers of acrylic acid, copolymers of acrylic acid and hydrophobic monomers, copolymers of carboxylic acid-containing monomers and acrylic acid esters, crosslinked copolymers of acrylic acid and acrylic acid esters, heteropolysaccharide gums, and crystalline long-chain acyl derivatives. The long-chain acyl derivatives are preferably selected from ethylene glycol stearate, alkanolamides of fatty acids having 16 to 22 carbon atoms, and mixtures thereof. Ethylene glycol distearate and polyethylene glycol 3-distearate are preferred long-chain acyl derivatives because they impart a pearlescent luster to the composition. Polyacrylic acid is commercially available as Carbopol 420, Carbopol 488, or Carbopol 493. Polymers of acrylic acid crosslinked with polyfunctional agents can also be used. These are commercially available as Carbopol 910, Carbopol 934, Carbopol 941, and Carbopol 980. A suitable copolymer of carboxylic acid-containing monomers and acrylic acid esters is Carbopol 1342. All Carbopol® materials are available from Goodrich. Suitable crosslinking polymers of acrylic acid and acrylic acid esters are Pemuren TR1 or Pemuren TR2.

[0052] A mixture of any of the above suspending agents can be used. Preferably, it is a mixture of a crosslinked polymer of acrylic acid and a crystalline long-chain acyl derivative.

[0053] The most preferred example is a cross-linked polyacrylate polymer.

[0054] If a suspending agent is included, it is generally present in the composition at a level of 0.01 to 5% by weight, preferably 0.1 to 2.5% by weight, and more preferably 0.25 to 1% by weight.

[0055] Another preferred optional component is a conditioning agent that provides conditioning benefits. Typically, the most well-known conditioning agents used in cosmetic compositions are water-insoluble oily substances, such as mineral oils, natural oils, triglycerides, and silicone oils. The conditioning benefits are achieved by the oily substance adhering to the hair, thereby forming a film, which makes the hair smoother and less prone to dryness. Preferably, the conditioning agent is non-volatile, meaning it has a vapor pressure of less than 1000 Pa at 25°C.

[0056] Preferably, the composition contains discontinuous dispersion droplets of a water-insoluble conditioning agent, wherein the dispersion droplets have an average droplet diameter (D) of less than 50 microns, preferably less than 30 microns, more preferably less than 15 microns, and most preferably less than 10 microns. 3,2 ) has. The average droplet diameter (D) of the water-insoluble conditioning agent. 3,2This can be measured using laser light scattering technology, for example, using a 2600D Particle Sizer from Malvern Instruments. The water-insoluble conditioning agent may include non-silicone conditioning agents containing non-silicone oily or fatty substances (e.g., hydrocarbon oils, fatty acid esters, and mixtures thereof). Preferably, the water-insoluble conditioning agent is an emulsified silicone oil.

[0057] Suitable silicones include polydiorganosiloxanes, particularly polydimethylsiloxane having the CTFA name dimethicone. Equally suitable for use in the compositions of the present invention (especially shampoos and conditioners) are polydimethylsiloxanes having hydroxyl-terminated groups, which have the CTFA name dimethiconol. Also equally suitable for use in the compositions of the present invention are silicone gums with a slight degree of crosslinking, which are described, for example, in WO96 / 31188. Preferably, the silicone oil contains dimethicone, dimethiconol, or a mixture thereof.

[0058] The viscosity of the emulsifying silicone itself (not the emulsion or the final hair care composition) is typically at least 10,000 cSt (centistokes = mm) at 25°C. 2 ·S -1 ) is preferably at least 60,000 cSt, most preferably at least 500,000 cSt, and ideally at least 1,000,000 cSt. To facilitate formulation, the viscosity is preferably 10 9 The kinematic viscosity of silicone oil should not exceed cSt. Suitable methods for measuring the kinematic viscosity of silicone oil are known to those skilled in the art, for example, a capillary viscometer. In the case of high-viscosity silicones, it is possible to measure the viscosity using a constant-stress rheometer.

[0059] Suitable emulsified silicones for use in the composition are available as preformed silicone emulsions from silicone suppliers (e.g., Dow Corning and GE Silicone). The use of such preformed silicone emulsions is preferred in terms of ease of processing and control of silicone particle size. Such preformed silicone emulsions typically additionally contain 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.

[0060] Examples of suitable preforming silicone emulsions include DC1785, DC1788, and DC7128, all of which are available from Dow Corning. These are dimethiconol / dimethicone emulsions.

[0061] Another type of silicone that can be used is functionalized silicone, such as amino-functionalized silicone, which means a silicone containing at least one primary, secondary, or tertiary amine group or a quaternary ammonium group. A suitable example of an amino-functionalized silicone is a polysiloxane with the CTFA name "amodimethicone".

[0062] Preferably, as described in WO03 / 094874, for example, a silicone emulsion droplet is mixed with a high molecular weight of a specific type of surface-active block polymer to form a silicone emulsion. One preferred form of the surface-active block polymer having polyoxypropylene groups and polyoxyethylene groups as hydrophobic and hydrophilic moieties, respectively, is represented by formula (V) and has the CTFA name poloxamer, which is commercially known by BASF under the trade name "Pluronic". [ka]

[0063] Suitablely, the mean value of x in equation (I) is 4 or greater, preferably 8 or greater, more preferably 25 or greater, even more preferably 50 or greater, and most preferably 80 or greater. The mean value of x is typically 200 or less. Suitablely, the mean value of y is 25 or greater, preferably 35 or greater, more preferably 45 or greater, and most preferably 60 or greater. The mean value of y is typically 100 or less.

[0064] Another preferred form of the surface-active block polymer is represented by formula (VI) and has the CTFA name poloxamine. They are marketed by BASF under the trade name "Tetronic". [ka]

[0065] Appropriately, the average value of a is 2 or more, preferably 4 or more, more preferably 8 or more, even more preferably 25 or more, and most preferably 40 or more. Typically, the average value of a is 200 or less. Appropriately, the average value of b is 6 or more, preferably 9 or more, more preferably 11 or more, and most preferably 15 or more. Typically, the average value of b is 50 or less.

[0066] Preferably, the surface-active blocking polymer is poloxamer and / or poloxamine, and more preferably, the surface-active blocking polymer is poloxamer.

[0067] Preferably, the surface-active block polymer is blended with dimethicone. The weight ratio of dimethicone to the surface-active block polymer in the blend 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, and most preferably 15:1 to 30:1.

[0068] 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%, and most preferably 1 to 5%, based on the total weight of the composition, and encompasses the entire range contained therein.

[0069] The composition may preferably contain a pearlescer. The preferred pearlescer is an ethylene glycol ester disclosed in U.S. Patent No. 4,885,107 (which is incorporated herein by reference). Preferably, the ethylene glycol ester is a glycol monoester or diester, and more preferably, a glycol diester.

[0070] Preferably, the ethylene glycol monoester or diester is C 12―22 It is an ethylene glycol monoester or diester of a fatty acid, and more preferably saturated C 12―22 The pearlescent agent is an ethylene glycol monoester or diester of a fatty acid. Most preferably, it is a diester containing a mixture of palmitate and stearate. The amount of stearate should be in the range of about 10% to about 42% or about 55% to about 80%, with palmitate making up the remainder. The amount of stearate is preferably about 60% to about 75%, more preferably about 80% to 95%, and most preferably 100%. The most suitable example of a pearlescent agent is ethylene glycol distearate. The pearlescent agent can also function as a suspending agent.

[0071] The level of the ethylene glycol ester is appropriately about 0.5% to about 6% by weight of the whole composition, preferably about 1% to about 4% by weight.

[0072] The viscosity of the composition, when measured at 30°C using a Brookfield V2 viscometer (spindle RTV5, 1 minute, 20 rpm), is appropriately in the range of 3,000 to 10,000 mPa.s, preferably in the range of 4,000 to 8,000 mPa.s, and more preferably in the range of 5,000 to 7,000 mPa.s.

[0073] The pH of the composition of the present invention is preferably in the range of 3 to 9, more preferably in the range of 4 to 8, and most preferably in the range of 4.5 to 6.5.

[0074] Rinse-off compositions are intended to be rinsed off the user's scalp with water after use. Rinse-off compositions are preferred. Leave-on compositions are intended not to be rinsed off the user's scalp immediately after use (i.e., within at least the first two hours, preferably at least four hours, after application of the composition). In relation to 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 to 15 minutes (preferably 1 to 10 minutes, more preferably 1 to 10 minutes) before being rinsed off.

[0075] A preferred use of the cosmetic composition is in shampoos, particularly rinse-off shampoos. The shampoo compositions for use in the present invention are generally aqueous; that is, they have water, an aqueous solution, or a lyotropic liquid crystal phase as their main component. Preferably, the shampoo composition contains 50-98% by weight, preferably 60-92% by weight, of water based on the total weight of the composition. Such compositions are referred to as having an aqueous base.

[0076] The present invention is illustrated here by the following non-limiting examples. Examples of the present invention are indicated by numbers, and comparative examples are indicated by letters.

[0077] Examples Examples were prepared according to Tables 1 and 3.

[0078] The adhesion of piroctone olamine was measured by thoroughly wetting 10 clean, dark brown European hair switches (2.5 g / 6 inch) with water. Five replicas were tested for each shampoo composition. 0.25 g of shampoo was applied to one switch and massaged for 30 seconds. The switch was then rinsed with water for 30 seconds. 0.25 g of shampoo was applied again and massaged for another 30 seconds. The shampoo was then rinsed off with water for 30 seconds. The switch was allowed to air dry. The dried switch was extracted with 50 mL of ethanol. Care was taken to avoid exposing the extract to ultraviolet light. The extract was analyzed by UPLC for piroctone olamine adhesion.

[0079] [Table 1]

[0080] [Table 2]

[0081] [Table 3]

[0082] [Table 4]

Claims

1. A personal cleansing composition comprising: (i) a cleansing surfactant comprising an amphoteric surfactant and an anionic surfactant (wherein, when the anionic surfactant is ethoxylated, it has an ethoxylation degree of less than 3), and the weight ratio of the anionic surfactant to the 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 its salt which is caprylic acid or its salt; and (iv) a piroctone compound; wherein the composition has a pH of 6 or less at 20 °C, and the weight ratio of the aliphatic fatty acid to the triglyceride oil is 2:3 to 3:

1.

2. The personal cleansing composition according to claim 1, wherein the pH of the composition is less than 6.

3. The personal care composition according to claim 1 or 2, wherein the cleansing surfactant is an ethoxylated alkyl sulfate having an ethoxylation degree of less than 2.

4. The personal care composition according to claim 3, wherein the ethoxylated alkyl sulfate is sodium lauryl sulfate (1EO).

5. The personal composition according to any one of claims 1 to 4, wherein the piroctone compound is piroctone olamine.

6. The personal care composition according to any one of claims 1 to 5, further comprising a cationic polymer.

7. The personal care composition according to any one of claims 1 to 6, comprising a total cleansing surfactant level of 3 to 35% by weight of the whole composition.

8. The personal care composition according to any one of claims 1 to 7, comprising a total level of piroctone compound of 0.1 to 5% by weight of the whole composition.

9. The personal care composition according to any one of claims 1 to 8, wherein the total level of coconut oil is 0.05 to 1.0% by weight of the whole composition.

10. The personal care composition according to any one of claims 1 to 9, which is a shampoo.

11. A non-therapeutic method of treating hair or scalp, comprising applying the personal care composition according to any one of claims 1 to 9 to the hair or scalp.

12. The non-therapeutic method according to claim 11, wherein the composition is rinsed off after use.

13. The composition according to any one of claims 1 to 9 for use in a method of reducing dandruff.