Transparent cosmetic and personal care compositions

Abstract

1. An aqueous conditioning composition comprising: i) 0.1 to 2 wt. % of a cationic conditioning polymer; ii) 0.1 to 5 wt. % of an anionic surfactant ethoxylated with a degree of ethoxylation of 3 to 15, comprising 0.1 to 5 wt. % of ethylene oxide groups; and iii) 0.001 to 2 wt. % of a piroctone compound, wherein the turbidity of the composition is less than 1 cm when measured using a UV / vis spectrophotometer by applying the formula Turbidity = (2.3 x A / L), where A is the absorbance of the sample measured at 750 nm and L is the path length. -1 an aqueous conditioning composition having a transparency of less than 10 mL; the composition has a maximum foam height of 10 mL, which is measured at 25°C and atmospheric pressure by diluting 1 g of the composition with 9 g of water in a 100 mL graduated cylinder having an inner diameter of 29 mm, recording the starting volume (V1), then stoppering the cylinder and vigorously shaking it vertically for 10 seconds, and then allowing it to stand for 60 seconds, after which measuring the foam height to the nearest 5 mL mark and subtracting the starting volume (V1) from this value; and the composition does not contain anionic, zwitterionic, and amphoteric surfactants other than those defined in ii), such that the foam height of the composition does not exceed the maximum foam height.

Description

[Technical Field]

[0001] The present invention relates to a clear anti-dandruff conditioner composition and a method of treating hair with said composition. [Background technology]

[0002] Cosmetic and personal care compositions are often required to possess multiple visual and functional attributes. For example, shampoo and hair conditioner compositions are generally required to possess properties in addition to their ability to cleanse and / or condition hair in order to appeal to consumers.

[0003] Clear, transparent compositions are often visually desirable but are difficult to formulate: additional benefit agents, such as anti-dandruff agents, can cause undesirable results such as cloudiness and discoloration. Summary of the Invention [Problem to be solved by the invention]

[0004] Hair conditioners are typically used after shampooing and are required to impart a high level of conditioning sensation (slipperiness, shine, smoothness, ease of detangling) to wet hair. Foaming upon application is highly disliked by consumers. Most conditioners are effective because they contain a dispersed lamellar gel phase that is highly efficient at detangling. However, they are opaque due to the dispersed phase. Attempts have been made in the past to make the dispersed lamellar gel phase fragments small enough so that the composition is transparent, but processing and stability problems have arisen. Other known clear conditioners are primarily polymer-based and are less effective at imparting conditioning benefits.

[0005] In contrast, shampoos are formulated to foam upon use and therefore typically contain high levels of foaming cleansing surfactants, which are typically anionic, zwitterionic / amphoteric, and nonionic in nature. Consumers associate foaming with cleansing benefits. Shampoos provide a fairly low level of conditioning benefits to hair, especially on wet hair. As a result, consumers typically use both shampoo and conditioner in a typical hair washing regimen, traditionally using shampoo first and then conditioner.

[0006] Anti-dandruff shampoos and conditioners may contain piroctone compounds, which are deposited on the hair and scalp during use. However, due to the cleansing action of surfactants present in the formulation, the deposited piroctone actives do not remain there; therefore, most of the piroctone is washed away.

[0007] It is known that increasing the amount of piroctone compounds can achieve a high anti-dandruff effect, for example:

[0008] WO2021 / 144267A1 discloses that a personal cleansing composition such as a shampoo containing i) a piroctone compound, ii) a cleansing surfactant containing an amphoteric surfactant and an ethoxylated alkyl sulfate in a specified ratio, and iii) a cationic polymer containing polyquaternium-6 improves deposition of the piroctone compound on the surface of the scalp and / or hair during hair washing.

[0009] JP H1135424A provides specific guanidine derivatives in shampoos and anti-dandruff shampoos to obtain cosmetic and sensory conditioning effects for hair.

[0010] EP2944852A1 discloses the use of a booster selected from alcohols having 2 to 5 hydroxyl groups and plant extracts to enhance the antidandruff or antiseptic activity of piroctone olamine in shampoos.

[0011] Despite the prior art, there remains a need for clear conditioner compositions that more efficiently deposit piroctone compounds into the hair and scalp while reducing washing during the hair washing process.

[0012] We have now discovered that by using a cationic polymer in combination with an ethoxylated anionic surfactant that contains multiple ethylene oxide groups, imparts excellent visual attributes without compromising conditioning performance, and exhibits minimal foam, a clear conditioner containing piroctone antidandruff agent can be provided. Surprisingly, this clear conditioner dramatically increases the deposition efficiency of the piroctone compound, thereby providing excellent antidandruff benefits with less piroctone. [Means for solving the problem]

[0013] According to the present invention, in a first aspect, i) 0.1 to 2 wt. % of a cationic conditioning polymer; ii) 0.1 to 5% by weight of an anionic surfactant ethoxylated with a degree of ethoxylation of 3 to 15, and iii) 0.001 to 2% by weight, preferably 0.01 to 1% by weight, more preferably 0.05 to 0.5% by weight of a piroctone compound 1. An aqueous conditioning composition comprising: The composition has a turbidity of 1 cm as measured using a UV / vis spectrophotometer by applying the formula Turbidity = (2.3 x A / L), where A is the absorbance of the sample measured at 750 nm and L is the path length. -1 has transparency that is less than the composition has a maximum foam height of 10 mL, the maximum foam height being measured at 25°C and atmospheric pressure by diluting 1 g of the composition with 9 g of water in a 100 mL graduated cylinder having an inner diameter of 29 mm, recording the starting volume (V1), then stoppering the cylinder and vigorously shaking it vertically for 10 seconds, followed by allowing it to stand for 60 seconds, and then measuring the foam height to the nearest 5 mL mark and subtracting the starting volume (V1) from this value; The aqueous conditioning composition is provided such that the composition does not contain any anionic, zwitterionic, or amphoteric surfactant other than those defined in ii), and the foam height of the composition does not exceed the maximum foam height.

[0014] In a second aspect, the present invention provides a non-therapeutic method of treating hair or scalp, the method comprising applying to said hair or scalp a composition according to the first aspect of the invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The anti-dandruff compositions of the present invention are clear and low foaming.

[0016] The level of foaming produced by the compositions of the present invention can be measured using any suitable method, a preferred method being the cylinder shake test as follows.

[0017] The cylinder shake test is preferably carried out under ambient conditions (25° C. and atmospheric pressure).

[0018] Test product (1 g) is diluted with water (9 g) and added to a 100 mL graduated cylinder. The starting volume (V1) is recorded. The cylinder is stoppered and then vigorously shaken vertically for 10 seconds. After allowing to stand for an additional 60 seconds, the foam height is visually measured to the nearest 5 mL mark. The starting volume of the solution (V1) is subtracted from this value, and the resulting calculation indicates the amount of air entrained in the foam, i.e., the "foam height."

[0019] A suitable 100 mL glass graduated cylinder is manufactured by Duran and supplied by VWR, and has an internal diameter of 29 mm.

[0020] According to this method, the maximum height of foam produced by the composition of the present invention is 10 mL, preferably 7 mL, more preferably 5 mL.

[0021] A suitable method for assessing clarity is to measure turbidity. UV-vis spectroscopy may be used to determine the turbidity of a formulation. An example of a suitable spectrophotometer is the JASCO V-650 spectrophotometer.

[0022] Translucency (or turbidity) in liquid products is caused by suspended or colloidal particles that scatter light rather than transmitting it directly through the sample.

[0023] Turbidity may be calculated using the following formula: 2.3 multiplied by the absorbance divided by the path length of the sample: Turbidity = (2.3 x A / L), where A is the absorbance of the sample measured at 750 nm and L is the path length. Preferably, a path length of 1.0 cm is used.

[0024] The turbidity measured using a UV / visible spectrophotometer using the formula Turbidity = (2.3 x A / L), where A is the absorbance of the sample measured at 750 nm and L is the path length, is -1 Less than 0.5cm, preferably -1 Less than 0.4cm, more preferably -1 Less than 0.25 cm, more preferably -1 Less than 0.1 cm, most preferably -1 If the viscosity is less than 100 uF, the composition is said to be transparent.

[0025] Cationic Conditioning Polymer The compositions of the present invention comprise at least one cationic conditioning polymer.

[0026] The cationic conditioning polymer is present in an amount ranging from 0.1 to 2% by weight, preferably from 0.1 to 1% by weight, relative to the total weight of the composition.

[0027] Preferably, the polymer has a polysaccharide backbone and the polysaccharide comprises a cationic modification. Preferably, the cationic modification comprises an amino group, such as a quaternary ammonium group.

[0028] Preferably, the polysaccharide backbone is cellulosic. Most preferably, the cellulosic backbone is hydroxyethyl cellulose.

[0029] A preferred polymer is Polyquaternium-10 (PQ10), available commercially, for example as Dow's UCare™ Polymer JR-30M.

[0030] Ethoxylated Anionic Surfactants The composition of the present invention comprises an ethoxylated anionic surfactant. The soluble ethoxylated anionic surfactant contains ethylene oxide (EO) groups with a degree of ethoxylation (n) of 3 to 15, preferably 5 to 15.

[0031] The ethoxylated anionic surfactant is preferably present in an amount of from 0.1 to 5% by weight, preferably from 0.1 to 2% by weight, based on the weight of the total composition.

[0032] Preferably, the ethoxylated anionic surfactant is linear.

[0033] The anion is preferably a phosphate group or a sulfate group.

[0034] Examples of preferred ethoxylated anionic surfactants include oleth-10-phosphate and PPG-5-ceteth-10 phosphate.

[0035] These are available from Croda as Crodafos™ O10A and Crodafos™ SG respectively.

[0036] The level of ethoxylation can be measured by any suitable method, one method being equilibrium headspace analysis.

[0037] Piroctone compounds Piroctone compounds useful in the present invention typically include the structure defined by formula (A).

[0038] [ka] During the ceremony, R4 is selected from a C1-C17 hydrocarbon group, R5 is selected from C1-4 alkyl, C2-4 alkenyl or alkynyl, hydrogen, phenyl, or benzyl, and M1 is selected from hydrogen, monoethanolamine (MEA), diethanolamine (DEA), or triethanolamine (TEA). A preferred R4 group is (CH3)3CCH2CH(CH3)CH2-, and a preferred R5 group is methyl. More preferably, R4 is (CH3)3CCH2CH(CH3)CH2-, R5 is methyl, and M1 is hydrogen or MEA. Most preferably, R4 is (CH3)3CCH2CH(CH3)CH2-, R5 is methyl, and M1 is monoethanolamine.

[0039] The piroctone compound used in the present invention is preferably selected from piroctonic acid, a primary olamine salt of piroctonic acid, a secondary olamine salt of piroctonic acid, a tertiary olamine salt of piroctonic acid, and mixtures thereof, and more preferably selected from piroctonic acid, a primary olamine salt of piroctonic acid, and mixtures thereof.

[0040] A preferred example of a primary olamine salt of piroctonic acid is piroctone olamine, which is available as Octirox®. An example of a suitable secondary olamine salt of piroctonic acid is the diethanolamine salt, and an example of a suitable tertiary salt of piroctonic acid is the triethanolamine salt.

[0041] Piroctone olamine is particularly preferred.

[0042] Typical levels of piroctone compounds are 0.001 to 2% by weight, preferably 0.01 to 1% by weight, more preferably 0.05 to 0.5% by weight, and most preferably 0.05 to 0.3% by weight.

[0043] In the compositions and methods of the present invention, the piroctone compound is partially or completely dissolved, resulting in a clear composition. A portion of the piroctone compound may be undissolved. The amount of undissolved anti-inflammatory agent is sufficiently low to maintain the clarity of the composition.

[0044] solvent The presence of a solvent is preferred to increase the solubility of the piroctone compound in the composition. The solvent allows a larger amount of the piroctone compound to be incorporated into the composition while maintaining transparency. The solvent can dissolve the piroctone compound at room temperature. Typically, room temperature is 20 to 30 degrees.

[0045] Preferred solvents are alcohols, preferably selected from propylene glycol (PG), dipropylene glycol (DPG) and mixtures thereof.

[0046] The solvent is preferably present in an amount of from 0.025 to 5% by weight, more preferably from 0.05 to 3% by weight, and even more preferably from 0.5 to 2% by weight, based on the total weight of the composition.

[0047] Cationic surfactants The composition preferably includes a cationic surfactant. The presence of the cationic surfactant aids in clarity, which is particularly useful when other ingredients, such as fragrances, are added.

[0048] Preferred cationic surfactants may be selected from quaternary ammonium surfactants and tertiary ammonium surfactants.

[0049] Preferred cationic surfactants include cocoamine ethoxylates, such as Ethomeen C / 25 or C / 15 available from Nouryon, PEG-15 cocamine and PEG-2 cocamine, and cetyltrimethylammonium chloride (CTAC).

[0050] The compositions of the present invention comprise cationic surfactants that preferably contain amino or quaternary ammonium hydrophilic moieties that become positively charged when dissolved in an aqueous composition.

[0051] Examples of suitable cationic surfactants correspond to the general formula:

[0052] [N(R1)(R2)(R3)(R4)]+(X)- In the formula, R1, R2, R3, and R4 are each independently (a) an aliphatic group of 1 to 22 carbon atoms, or (b) Hydrogen or a polyoxyalkylene group having up to 22 carbon atoms, a hydroxyalkyl group, an aromatic group, an alkoxy group, an alkylamido group, a hydroxyalkyl group, an aryl group, or an alkylaryl group. is selected from X is a salt-forming anion, examples of which include those selected from halide (e.g., chloride, bromide), acetate, citrate, lactate, glycolate, nitrate phosphate, sulfate, and alkyl sulfate radicals.

[0053] Aliphatic groups can contain, in addition to carbon and hydrogen atoms, ether linkages and other groups such as amino groups. Longer chain aliphatic groups, for example, those of about 12 carbons or higher, can be saturated or unsaturated.

[0054] Specific examples of such quaternary ammonium cationic surfactants of the above general formula include PEG-15 cocamine and PEG-2 cocamine, cetyltrimethylammonium chloride (CTAC) and salts thereof where the chloride is replaced by other halides (e.g., bromides), acetates, citrates, lactates, glycolates, nitrates, phosphates, sulfates, or alkyl sulfates.

[0055] In a preferred class of cationic surfactants of the above general formula, R 1 is C2~C 22 R is a saturated or unsaturated, preferably saturated, alkyl chain of 2 , R 3 , and R 4 are each independently selected from CH3 and (CH2CH2O)nH, preferably (CH2CH2O)nH.

[0056] The concentration of the cationic surfactant is preferably 0.05 to 5% by weight, more preferably 0.1 to 2% by weight, of the total composition. Some cationic surfactants may generate foam in the compositions of the present invention. If present, the amount of cationic surfactant is such that the maximum foam height, as defined and determined herein, is not exceeded.

[0057] An additional acid may be used to protonate the amine. Suitable acids include hydrochloric acid, citric acid, acetic acid, tartaric acid, fumaric acid, lactic acid, malic acid, succinic acid, and mixtures thereof. Preferably, the acid is selected from the group consisting of acetic acid, tartaric acid, hydrochloric acid, lactic acid, and mixtures thereof.

[0058] Mixtures of any of the above cationic surfactants may also be suitable.

[0059] Rheology Modifiers The compositions of the present invention preferably include a rheology modifier to improve the spreadability of the composition on the hair, which typically thickens the composition.

[0060] When present, the rheology modifier is preferably present in an amount of 0.2 to 2 wt %, most preferably 0.5 to 1.5 wt %.

[0061] Preferably, the rheology modifier is a polysaccharide, preferably derived from cellulose.

[0062] Preferably, the rheology modifier is non-ionic.

[0063] Preferably, the structuring agent has a molecular weight in the range of 500 kDa to 2 MDa.

[0064] An example of a suitable rheology modifier is Hydroxy Ethyl Cellulose (HEC), available under the trade name Natrosol, for example, from Ashland, Inc. Another suitable example is Amaze XT, available from Nouryon, Inc.

[0065] Preferred rheology modifiers include hydroxyethyl cellulose and hydroxypropyl methylcellulose. The most preferred structuring agent is hydroxyethyl cellulose.

[0066] Transparency Aid The composition may include a clarity aid to improve clarity. The clarity aid is different from, and is not intended to be the same as, the solvents described above for the piroctone compounds.

[0067] Clarification aids are particularly useful to aid in the dissolution of ingredients such as fragrances.

[0068] Preferred clarifying aids are non-ionic and can be selected from non-ionic surfactants and non-ionic emulsifiers.

[0069] Preferred clarification aids are Polysorbate 20, such as Tween™ available from Croda, and Laureth-7, such as Marlipal 24 / 70 available from Sasol.

[0070] Some clarification aids may cause foaming in the compositions of the present invention. When present, the clarification aid is present in an amount that prevents foam height from exceeding a maximum value defined herein. Thus, when present, the clarification aid is preferably present in an amount of 0.1 to 5 wt. % based on the weight of the total composition, more preferably 0.2 to 2 wt. %, and most preferably 0.25 to 1.5 wt. %.

[0071] The composition of the present invention comprises water, suitably in an amount of 60 to 98% by weight, preferably 80 to 97% by weight, most preferably 90 to 97% by weight, based on the weight of the total composition.

[0072] The compositions of the present invention preferably do not contain any dispersed phases that affect clarity (ie, do not dissolve), such as silicone emulsions.

[0073] Such a dispersed phase comprises dispersed droplets of a water-insoluble material. Examples of water-insoluble conditioning agents include non-silicone conditioning agents, including non-silicone oily or fatty materials, such as hydrocarbon oils, fatty esters, and mixtures thereof. Preferably, the water-insoluble conditioning agent is an emulsified silicone oil.

[0074] In the context of the present invention, free of dispersed phase means having less than 0.1 wt. % of dispersed phase, preferably less than 0.05 wt. %, more preferably less than 0.001 wt. %, even more preferably less than 0.0001 wt. %, and most preferably 0 wt. %, based on the weight of the total composition.

[0075] The pH of the composition is preferably 3-7, more preferably 3.5-6.5, and most preferably 5-6.

[0076] The composition is free of anionic, zwitterionic and amphoteric surfactants other than those defined in ii) to prevent the foam height of the composition from exceeding the Maximum Foam Height.

[0077] In the context of the present invention, not containing anionic, zwitterionic and amphoteric surfactants other than those defined in ii) means that the level of these foam-generating anionic, zwitterionic and amphoteric surfactants is preferably less than 1.0 wt.%, more preferably less than 0.5 wt.%, more preferably less than 0.1 wt.%, even more preferably less than 0.001 wt.%, and most preferably 0 wt.% based on the total weight of the composition.For example, such surfactants may be present as "carryover" in the raw materials used in the composition of the present invention.The amount of surfactant is such that the foam height of the composition does not exceed the maximum foam height.

[0078] In particular, these anionic, zwitterionic and amphoteric surfactants preferably include the following classes of surfactants:

[0079] surfactants with alkyl chains with less than 16 CC atoms; polyoxyethylene alkyl ether sulfates having an average mole number of added ethylene oxide in the range of 1 to 5, preferably 1 to 3; Betaines (with alkyl chain lengths less than 16), such as oleyl betaine, caprylamidopropyl betaine, lauramidopropyl betaine, isostearylamidopropyl betaine, and cocoamidopropyl betaine; Amine oxides, such as lauramine oxide and cocamine oxide; Cocamide monoethanolamine (CMEA); Amphoacetate; Taurates, isothionates, glycinates and sulfonates such as alpha olefin sulfonates.

[0080] Further materials Compositions according to the present invention may include any of a number of ingredients common to hair compositions.

[0081] Other ingredients may include deposition polymers, preservatives, colorants, polyols such as glycerin and polypropylene glycol, chelating agents such as EDTA, antioxidants such as vitamin E acetate, fragrances, antimicrobial agents, and pH adjusters, such as acids, preferably organic acids. Each of these ingredients is present in an amount effective to achieve its purpose.

[0082] Preferably, the additional ingredients include fragrances, preservatives, and antimicrobial agents.

[0083] Mixtures of any of the above active ingredients may also be used.

[0084] Generally, such ingredients may be included individually at a concentration of up to 5% by weight of the total composition, preferably 2%, most preferably 1%.

[0085] Embodiments of the present invention are provided in the following examples, in which all percentages are by weight based on total weight unless otherwise specified. [Example]

[0086] The invention will now be illustrated by the following non-limiting examples. In the examples, and throughout the specification, all percentages are by weight based on the total composition unless otherwise specified.

[0087] Example 1 - Preparation of Compositions 1 to 4 According to the Invention and Comparative Compositions A and B The following compositions were prepared: 1 to 4 according to the invention, A and B for comparison.

[0088] Conditioner Composition 1 contains a cationic conditioning polymer, an ethoxylated anionic surfactant containing 10 EO groups, and 0.1% by weight of piroctone olamine.

[0089] Conditioner Compositions 2-4 further comprise a cationic surfactant, a rheology modifier, a solvent (propylene glycol or dipropylene glycol), and varying amounts of piroctone olamine.

[0090] Comparative Conditioner Composition A is representative of a typical prior art shampoo composition and contains sodium lauryl ether phosphate (SLES) 1EO and cocoamidopropyl betaine and 0.5% by weight of piroctone olamine.

[0091] Comparative conditioner composition B is the same as composition 1 but does not contain piroctone olamine.

[0092] In the following tests, the following commercially available shampoos were used:

[0093] Control 1: A commercially available anti-dandruff shampoo, "Clear Antidandruff Nourishing Shampoo Anti Hair Fall Women's," was used as a control for the piroctone olamine deposition test. This product contains 0.50% octopirox.

[0094] Control 2: A commercially available anti-dandruff shampoo, "Head and Shoulders 2 in 1 Men Total Care with sea minerals," was used as a control in the piroctone olamine deposition and foam production tests. This product contains at least 0.50% octopirox.

[0095] The compositions of Compositions 1 to 4 and A and B are shown in Table 1 below.

[0096] Table 1: Compositions 1 to 4 according to the present invention and comparative compositions A and B [Table 1] The compositions in Table 1 were prepared as follows.

[0097] The first vessel was charged with water (300 mL) at 25°C.

[0098] If present, hydroxyethyl cellulose was added to the water and stirred for 2 minutes.

[0099] The cationic conditioning polymer (Polyquaternium-10) was added and the mixture was stirred for an additional 2 minutes.

[0100] If present, the cationic surfactant (PEG-15 cocamine or PEG-2 cocamine) was added and the mixture was stirred for an additional 2 minutes.

[0101] In a second vessel, the anionic surfactant along with the minor ingredients was added to water (35 mL) at 70° C. and gently stirred until dissolved.

[0102] The resulting hot solution was added to the mixture in the first vessel and heated to 40° C. with stirring at 100 rpm for 30 minutes, then cooled to room temperature.

[0103] The remaining ingredients (flavor, polysorbate 20, citric acid, piroctone olamine (added as a slurry with water) were added with continuous stirring at 100 rpm.

[0104] Example 2 - Deposition of Piroctone Olamine on Hair Treated with Conditioner Compositions 1-4 According to the Invention, Comparative Compositions A and B, and Shampoo Controls 1 and 2 Hair Treatment Dark brown European virgin hair switches (2.5 g, 6 inches) were used in the following tests and procedures.

[0105] The hair switches were pre-washed twice with the base shampoo composition to remove surface dirt before beginning the treatment. Each hair switch was wet and treated with 0.1 g of shampoo per gram of hair, lathered for 30 seconds, and then rinsed for 30 seconds under warm running water. The hair was combed and excess water was gently squeezed out.

[0106] For the shampoo controls (Controls 1 and 2) and Comparative Composition A, 0.1 g of shampoo per gram of hair was applied to the hair, lathered for 30 seconds, and then rinsed with warm running water for 30 seconds. A second application and rinse were performed in the same manner. The hair was combed and excess water was gently squeezed out.

[0107] For each conditioner formulation (Formulations 1-4 and Formulation B), 0.2 g of conditioner formulation per gram of hair was evenly applied to washed hair switches (three switches per composition), massaged into the hair, and rinsed for 1 minute. Excess water was then gently removed, and the switches were dried in a drying cabinet at 50°C.

[0108] It should be noted that the shampoo formulations were applied twice at 0.1 grams of product per gram of hair, with rinsing after each application, while the conditioner formulations were applied once at 0.2 grams of product per gram of hair. These applications are representative of consumer behavior.

[0109] Extraction of hair switches for piroctone olamine deposition analysis: Each dried hair switch was placed in a suitable jar and approximately 10 mL of pure ethanol was added. The jar was then sealed and placed on a roller bed for 1 hour before the extract was removed using a syringe.

[0110] Octopirox deposition in hair The amount of octopirox deposited on the hair was measured by HPLC, and the results are shown in Table 2 below.

[0111] Table 2 - Deposition of piroctone olamine (octopirox) on hair treated with conditioner compositions 1-4 according to the invention, comparative compositions A and B, and shampoo controls 1 and 2 [Table 2] Example 3 - Efficiency of Piroctone Olamine (Octopirox) Deposition on Hair Treated with Conditioner Compositions 1-4 According to the Invention, Comparative Compositions A and B, and Shampoo Controls 1 and 2 Deposition efficiency Theoretical maximum deposition amount The theoretical maximum deposition of octopirox on hair was calculated by multiplying the amount of octopirox in the composition (wt%) by the dose applied to the hair (0.2 g) and expressing the result in ppm.

[0112] The measured deposition of octopirox (ppm) on hair after the above treatments can be divided by the theoretical maximum to obtain the deposition efficiency, which reflects the proportion of octopirox retained on the hair.

[0113] The deposition efficiency is shown in Table 3.

[0114] Table 3 - Theoretical maximum deposition, measured deposition, and calculated deposition efficiency of piroctone olamine (octopirox) on hair treated with conditioner compositions 1-4 according to the invention, comparative compositions A and B, and shampoo controls 1 and 2. [Table 3] It has been found that the deposition of Octopirox from these rinse-off products is an inefficient process, with the majority of the anti-dandruff benefit agents present being removed during the rinse stage.

[0115] Control shampoos 1 and 2, and comparative example A all deliver octopirox at deposition efficiencies ranging from 0.80 to 1.16%.

[0116] Compositions 1 to 4 according to the present invention deliver octopirox with significantly higher deposition efficiencies of 1.40 to 2.68%.

[0117] Example 4: Foaming properties of compositions 1 and 2 according to the invention and comparative composition A Consumers dislike foaming of hair conditioners during use, which they strongly associate with cleansing and not with care.

[0118] The foaming levels of conditioner compositions 1, 2, and A were evaluated.

[0119] Cylinder Shake Foam Test The foam level produced by the compositions of the present invention was measured at ambient temperature (25° C.) and atmospheric pressure using the following method.

[0120] One gram of test product was diluted with 9 grams of water and added to a 100 mL graduated glass cylinder, manufactured by Duran and having an internal diameter of 29 mm, supplied by VWR. The initial volume (V1) was recorded. The cylinder was stoppered and shaken vigorously vertically for 10 seconds. After allowing to stand for an additional 60 seconds, the foam height was measured visually to the nearest 5 mL mark. The amount of air entrapped in the foam was calculated by subtracting the initial volume of the solution (V1 = 10 mL) from this value.

[0121] The results are shown in Table 4.

[0122] Table 4: Foam height of compositions 1, 2 and A [Table 4] It can be seen that the compositions of the present invention exhibit very low foam levels.

[0123] Example 5: Transparency of Compositions 1 to 4 according to the present invention and Comparative Composition B The clarity of conditioner compositions 1 to 4 and B was evaluated by measuring the turbidity. -1 If it is lower, the conditioner formulation is said to be clear.

[0124] The clarity of each formulation was measured using a Jasco V-650 spectrophotometer. The absorbance at 750 nm was converted to a turbidity value according to the following equation:

[0125] Turbidity = (2.3 x absorbance) / pathlength, where A is the absorbance measured from the sample at 750 nm and the pathlength was 1.0 cm. The turbidity of compositions 1 to 4 and B is shown in Table 5 below.

[0126] Table 5: Turbidity of Compositions 1 to 4 and B [Table 5] A clear sample has a turbidity of 1.0 cm -1 Lower.

[0127] At the lowest level of octopirox (Example 1) (0.1 wt%), clarity is achieved without the use of any clarifying aids or solvents.

[0128] Example 2 shows that even when a rheology modifier and a cationic surfactant are introduced, transparency can be maintained by adding a clarity aid.

[0129] Examples 3 and 4 show that, according to the present invention, excellent clarity can be achieved at higher octopirox concentrations by adding a solvent.

[0130] Example 6: Conditioning Properties of Compositions 2, 3, and a Commercial Clear Conditioner (Friction Levels on Treated Hair) The level of friction on the hair may be used as an indicator of the level of smoothness imparted to the hair by the conditioning treatment.

[0131] The coefficient of friction is a dimensionless number defined as the ratio of the friction force to the normal force.

[0132] Hair (5 g switches) was first wetted with water and treated with 1 g of composition (2 and 3) and then diluted with a further 7 mL of water.

[0133] The coefficient of friction (CoF) was then determined by running a physical finger over the hair switch on a custom-made instrumented force plate that measured force and torque in three dimensions using six force transducers.

[0134] A commercially available transparent conditioner, L'Oreal Fibrology Transparent Conditioner, was also used as a comparison.

[0135] The results are shown in Table 6.

[0136] Table 6: Coefficient of friction of hair treated with Compositions 2 and 3 and a commercial clear conditioner [Table 6] Compositions 2 and 3 provided excellent low friction.

Claims

1. i) 0.1 to 2 wt. % of a cationic conditioning polymer; ii) anionic surfactants ethoxylated with a degree of ethoxylation of 3 to 15 and containing 0.1 to 5% by weight of ethylene oxide groups; and iii) 0.001 to 2% by weight of a piroctone compound 1. An aqueous conditioning composition comprising: The composition has a turbidity of less than 1 cm as measured using a UV / vis spectrophotometer using the formula Turbidity = (2.3 x A / L), where A is the absorbance of the sample measured at 750 nm and L is the path length. －１ with transparency that is less than the composition has a maximum foam height of 10 mL, the maximum foam height being measured at 25°C and atmospheric pressure by diluting 1 g of the composition with 9 g of water in a 100 mL graduated cylinder having an inner diameter of 29 mm, recording the starting volume (V1), then stoppering the cylinder and vigorously shaking it vertically for 10 seconds, followed by allowing it to stand for 60 seconds, and then measuring the foam height to the nearest 5 mL mark and subtracting the starting volume (V1) from this value; An aqueous conditioning composition, wherein the composition does not contain any anionic, zwitterionic or amphoteric surfactants other than those defined in ii), such that the foam height of the composition does not exceed the maximum foam height.

2. 10. The composition of claim 1, comprising 0.025 to 5% by weight of a solvent that dissolves the piroctone compound at room temperature.

3. 3. The composition of claim 2, wherein the solvent is selected from propylene glycol, dipropylene glycol, and mixtures thereof.

4. 2. The composition of claim 1, wherein the piroctone compound is selected from the group consisting of piroctonic acid, a primary olamine salt of piroctonic acid, a secondary olamine salt of piroctonic acid, and a tertiary olamine salt of piroctonic acid, and mixtures thereof.

5. The composition of claim 4, wherein the piroctone compound is piroctone olamine.

6. A composition according to any one of the preceding claims, further comprising 0.05 to 5% by weight, preferably 0.1 to 2% by weight, of a cationic surfactant.

7. The composition of claim 6, wherein the cationic surfactant is selected from quaternary ammonium surfactants and tertiary ammonium surfactants.

8. 10. The composition of claim 1, wherein the cationic conditioning polymer has a polysaccharide backbone, the polysaccharide comprising a cationic modification.

9. The composition of claim 8 , wherein the cationic modification comprises an amino group.

10. 10. A composition according to any one of the preceding claims, wherein the ethoxylated anionic surfactant has a degree of ethoxylation n of from 5 to 15.

11. 10. A composition according to any one of the preceding claims, further comprising a rheology modifier, preferably a polysaccharide, in an amount of 0.2 to 2 wt%.

12. 10. A composition according to any one of the preceding claims, further comprising a clarifying aid, preferably selected from nonionic surfactants and nonionic emulsifiers.

13. 13. The composition of claim 12, wherein the clarity aid is present in an amount of 0.1 to 5 wt%, more preferably 0.2 to 2 wt%, most preferably 0.25 to 1.5 wt%, so that the maximum foam height as defined in claim 1 is not exceeded.

14. A composition according to any preceding claim, which does not contain a dispersed phase which affects the transparency.

15. A composition according to any one of claims 1 to 14 for use in a non-therapeutic method comprising applying the composition to the hair or scalp.

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