Hair care composition

Abstract

A hair care composition is disclosed comprising i) a surfactant; ii) a cationic polymer iii) selenium sulfide; wherein the mean particle size of the selenium sulfide is from 5 to 15 microns; wherein said cationic polymer is selective from cationic guar, copolymer comprising acrylamidopropyltrimonium chloride and mixture thereof; wherein said cationic polymer has molecular weight of 50,000 to 5,000,000 g / mol.

Description

[0001] HAIR CARE COMPOSITION

[0002] Field of the Invention

[0003] This invention relates to hair care compositions, more particularly the invention relates to hair care rinse-off compositions comprising selenium sulfide having specific mean particle size with the presence of a specific cationic polymer for improved deposition.

[0004] Background of the Invention

[0005] Dandruff control is an important aspect of hair cleansing and care. Anti-dandruff benefit has been provided through hair care compositions including shampoos and hair conditioners.

[0006] Dandruff is an issue that affects many people globally. The condition is manifested by the shedding of clumps of dead skin cells from the scalp. These are white in colour and provide an aesthetically displeasing appearance. A factor that contributes to dandruff is certain members of the Malassezia yeasts. To combat these, anti-dandruff products have included certain antidandruff agents which have anti-fungal activity, for example, selenium sulfide, piroctone compound such as piroctone olamine. These anti-dandruff agents remove (or at least reduce the level of) the Malassezia from the scalp and provide moderately effective treatment of the dandruff condition. Such a product performs as a hair cleansing shampoo or as a hair conditioner while mitigating the causes of dandruff.

[0007] A common problem with such anti-dandruff active is that deposition of the active onto the desired surface during wash process is minimum. The desired surface is typically scalp and / or hair. During the excessive rinsing process, the majority of selenium sulfide is likely to be washed away together with the surfactants. Consequently, there remains a need to improve the deposition of selenium sulfide onto the surface of scalp and / or hair during washing process.

[0008] The present inventors have now found unexpectedly that the selenium sulfide having specific particle size with the presence of specific cationic polymer in the rinse-off composition, can have enhanced deposition of selenium sulfide onto the surface of scalp and / or hair.

[0009] Summary of the Invention

[0010] In a first aspect, the present invention is directed to a hair care composition comprising:

[0011] i) a surfactant;

[0012] ii) a cationic polymer; andiii) a selenium sulfide; wherein the mean particle size of the selenium sulfide is from 5 to 15 microns; wherein said cationic polymer is selective from cationic guar, copolymer comprising acrylamidopropyltrimonium chloride and mixture thereof; wherein said cationic polymer has molecular weight of 50,000 to 5,000,000 g / mol.

[0013] In a second aspect, the present invention is directed to a hair care composition of the first aspect for use in preventing or alleviating the symptoms of dandruff on the scalp or hair.

[0014] In a third aspect, the present invention is directed to a non-therapeutic method of providing deposition of selenium sulfide on a topical surface of a human or animal body comprising a step of applying a safe and effective amount of a hair care composition of the first aspect.

[0015] All other aspects of the present invention will more readily become apparent upon considering the detailed description and examples which follow.

[0016] Detailed Description of the Invention

[0017] Hair Care Composition

[0018] “Hair care composition”, as used herein, is meant to include a composition for topical application to hair and / or scalp of mammals, especially humans. Such a composition may be generally classified as leave-on or rinse off, and includes any product applied to a human body for also improving appearance, cleansing, odor control or general aesthetics. The composition of the present invention can be in the form of a liquid, lotion, cream, foam, scrub, gel, or bar. Non-limiting examples of such compositions include leave-on hair lotions, creams, and rinse-off shampoos, conditioners, preferably is rinse-off shampoos or conditioners.

[0019] Mean particle size

[0020] “Mean particle size”, as used herein, refers to volume average particle size (D50). The volume average particle size (D50) of a given material can be determined by Malvern Mastersizer laser diffraction instrument.

[0021] Molecular weight

[0022] “Molecular weight”, as used herein, refers to the weight average molecular mass of a given polymer. The weight average molecular weight (WAVG MW) of a given polymer can be determined by SEC (Size Exclusion Chromatography) analysis using absolute calibration. Polysaccharide standards pulluan and dextran were used for calibration.Charge density

[0023] “Charge density”, as used herein, refers to the number of cationic charges per weight unit of a given polymer. Cationic charge density can be calculated from the degree of substitution as described in WO 2013 / 011122, the disclosure of which is hereby incorporated by reference in its entirety but especially page 8 lines 8-17. The degree of substitution is measured by 1H NMR in a solvent of deuterium oxide (D2O) and deuterium chloride (DCI) mixture. The degree of substitution measurement is generally taken without extraction. For example, for cationic guar polymer obtained by reacting with 2,3-epoxypropyltrimethylammonium chloride, the cationic charge density may be calculated from the degree of substitution using the following equation:

[0024]

[0025] Cationic charge density in milhequivalents per gram (meq / g)=

[0026]

[0027] — —

[0028] Miscellaneous

[0029] Except in the examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and / or use may optionally be understood as modified by the word “about”.

[0030] All amounts are by weight of the final hair care composition, unless otherwise specified.

[0031] It should be noted that in specifying any ranges of values, any particular upper value can be associated with any particular lower value.

[0032] For the avoidance of doubt, the word “comprising” is intended to mean “including” but not necessarily “consisting of” or “composed of”. In other words, the listed steps or options need not be exhaustive.

[0033] The disclosure of the invention as found herein is to be considered to cover all embodiments as found in the claims as being multiply dependent upon each other irrespective of the fact that claims may be found without multiple dependency or redundancy.

[0034] Where a feature is disclosed with respect to a particular aspect of the invention (for example a composition of the invention), such disclosure is also to be considered to apply to any other aspect of the invention (for example a method of the invention) mutatis mutandis.Selenium sulfide

[0035] Selenium sulfide, also referred as selenium sulphide or selenium disulfide, is an antifungal agent which can be used on the scalp / hair to help control the symptoms of dandruff.

[0036] The selenium sulfide of the present invention has a mean particle size from 5 to 15microns, preferably from 5 to 13 microns, furthermore preferably from 5 to 8 microns, preferably from 5 to 7 microns, more preferably from 5 to 6 microns.

[0037] When the mean particle size of the selenium sulfide is further increased, the stability of the composition may be compromised. In order to get a stable composition, the mean particle size of selenium sulfide is not higher than 15 microns, preferably not higher than 13 microns, more preferably not higher than 8 microns, more preferably not higher than 7 microns, more preferably not higher than 6 microns..

[0038] The composition may comprise from 0.01 to 5%, preferably 0.05 to 2%, more preferably from 0.1 to 2%, more preferably from 0.1 to 1.5%, more preferably from 0.5 to 1.5%, furthermore preferably from 0.5 to 1% of selenium sulfide by weight of the composition.

[0039] Cationic polymer

[0040] The composition of the present invention comprises a cationic polymer.

[0041] It is preferred that the cationic polymer has a molecular weight of from 50,000 to 5,000,000 g / mol and a charge density of from 0.1 to 7meg / g. The cationic polymer of the present invention has a molecular weight of from 50,000 to 5,000,000 g / mol, preferably from 100,000 to 4,500,000 g / mol, more preferably from 500,000 to 4,500,000 g / mol, furthermore preferably from 1,000,000 to 2,500,000. It is preferred that the cationic polymer has a charge density of from 0.1 to 7meq / g, preferably from 0.2 to 5meq / g, preferably from 0.2 to 3meq / g, more preferably from 0.5 to 3 meq / g, preferably from 0.8 to 2.5 meq / g.

[0042] The cationic polymer of the present invention is selected from a group consisting of cationic guar, and copolymer comprising acrylamidopropyltrimonium chloride . The cationic polymer of the present invention is preferably selected from guar hydroxypropyltrimonium chloride, acrylamidopropyltrimonium chloride / acrylamide copolymer, and mixture thereof.

[0043] Preferably the cationic polymer of the present invention is cationic guar. And the cationic guar is preferably guar hydroxypropyltrimonium chloride.Alternatively, the cationic polymer is preferably copolymer comprising acrylamidopropyltrimonium chloride. The copolymer comprising acrylamidopropyltrimonium chloride is preferably acrylamidopropyltrimonium chloride / acrylamide copolymer. An example of a suitable copolymer is commercially available from Ashland under the trade name N-Hance SP-100®. N-Hance SP-100® has a charge density of from 1.8 to 2.2 meq / g and a molecular weight of from 1 ,800,000 to 2,200,000 g / mol.

[0044] The cationic polymer is preferably present in an amount of from 0.01 to 10%, more preferably from 0.05 to 5%, furthermore preferably 0.1 to 2%, most preferably from 0.2 to 1% by weight of the composition.

[0045] It is preferred that the weight ratio of the amount of cationic polymer to that of said selenium sulfide is from 1 :20 to 10: 1 , preferably from 1 : 10 to 5: 1 , preferably from 1 : 10 to 1 : 1 , preferably from 1:10 to 1:3, preferably from 1:10 to 1:4.

[0046] Surfactant

[0047] The composition in accordance with this invention comprises a surfactant, preferably comprising an anionic surfactant.

[0048] Non-limiting examples of suitable anionic surfactants are alkyl sulphates, alkyl ether sulphates, alkaryl sulphonates, alkanoyl isethionates, alkyl succinates, alkyl sulphosuccinates, alkyl ether sulphosuccinates, N-alkyl sarcosinates, alkyl phosphates, alkyl ether phosphates, and alkyl ether carboxylic acids and salts thereof, especially their sodium, magnesium, ammonium and mono-, di- and triethanolamine salts. The alkyl and acyl groups generally contain from 8 to 18, preferably from 10 to 16 carbon atoms and may be unsaturated. The alkyl ether sulphates, alkyl ether sulphosuccinates, alkyl ether phosphates and alkyl ether carboxylic acids and salts thereof may contain from 1 to 20 ethylene oxide or propylene oxide units per molecule. Typical anionic surfactants for use in compositions of the invention include, but not limited to, sodium oleyl succinate, ammonium lauryl sulphosuccinate, sodium lauryl sulphate, sodium lauryl ether sulphate, sodium lauryl ether sulphosuccinate, ammonium lauryl sulphate, sodium dodecylbenzene sulphonate, triethanolamine dodecylbenzene sulphonate, sodium cocoyl isethionate, sodium lauryl isethionate, lauryl ether carboxylic acid, sodium N-lauryl sarcosinate or mixtures thereof.Preferred anionic surfactants is selected from the group consisting of the alkyl sulphates and alkyl ether sulphates having straight or branched alkyl chains and mixtures thereof. Preferred alkyl sulphates are C8-18 alky sulphates, more preferably C12-18 alkyl sulphates, preferably in the form of a salt with a solubilising cation such as sodium, potassium, ammonium or substituted ammonium. Examples are sodium lauryl sulphate (SLS) or sodium dodecyl sulphate (SDS).

[0049] It is particularly preferred that the anionic surfactant is alkyl ether sulphate. Preferred alkyl ether sulphates are those having the formula: RO(CH2CH2O)nSO3M; wherein R is an alkyl or alkenyl having from 8 to 18 (preferably 12 to 18) carbon atoms; M is a solubilising cation comprising sodium, potassium, ammonium, substituted ammonium or mixtures thereof; n is the degree of ethoxylation of from 0.5 to 3. Preferred alkyl ether sulphate is sodium lauryl ether sulphate having an average degree of ethoxylation of from 0.5 to 3, preferably from 1 to 3, more preferably from 1 to 2. It is more preferred that the anionic surfactant is sodium lauryl ether sulphate (SLES)

[0050] Alternatively, it is preferred that the surfactant is sulfate-free.

[0051] The composition may comprise an alpha olefin sulfonate anionic surfactant of general formula (I):

[0052] RI-CH=CH-CH2-SO3-M+(I)

[0053] in which Ri is selected from linear or branched alkyl groups having from 11 to 13 carbon atoms and mixtures thereof; and M is a solubilizing cation;

[0054] Preferably Ri in general formula (I) is a C14 or C16 linear alkyl group.

[0055] Preferably M in general formula (I) is selected from alkali metal cations (such as sodium or potassium), ammonium cations and substituted ammonium cations (such as alkylammonium, alkanolammonium or glucammonium).

[0056] Commercially produced alpha olefin sulfonate anionic surfactants of general formula (I) may be made by sulfating C14-16 olefins derived from natural gas. The process can also yield mixtures of homologues and low levels of unreacted olefins.Particularly preferred is alpha olefin sulfonate with an average of 14-16 carbons. A suitable example of such a material is Bioterge AS40 (ex-Stepan).

[0057] The amount of alpha olefin sulfonate anionic surfactant, at 100% activity of general formula (I) ranges from 3 to 13 %, preferably from 3.5 to 12%, more preferably from 3 to 10%, (by weight based on the total weight of the composition).

[0058] The composition may comprise a co-surfactant, preferably comprises an amphoteric or zwitterionic surfactant. The composition may comprise from 0.1 to 10%, preferably from 0.5 to 8 %, more preferably from 1 to 5% of the co-surfactant surfactant by weight of the composition.

[0059] The composition may comprise an amphoteric or zwitterionic surfactant, selected from an alkyl betaine of general formula (II)

[0060] R2-N+(CH3)2-CH2-COO- M+(II)

[0061] wherein R2= C12 (Lauryl) or Coco derived;

[0062] an alkyl hydroxy sultaine of general formula (III),

[0063] R3-N+(CH3)2-CH2-CH(OH)-CH2-SO3- M+(III)

[0064] wherein R3= C12 (Lauryl) or Coco derived;

[0065] an alkyl aminopropyl hydroxy sultaine of general formula (IV),

[0066] R4-CO-NH-(CH2)3-N+(CH3)2-CH2-CH(OH)-CH2-SO3- M+(IV)

[0067] wherein R4= C12 (Lauryl) or Coco derived;

[0068] an alkyl amphoacetate of general formula (V),

[0069] R5-CO-NH-(CH2)2-N(CH2-CH2-OH)(CH2-COO- M+) (V)

[0070] wherein Rs = C12 (Lauryl) or Coco derived;

[0071] and mixtures thereof.The preferred surfactant (II) is selected from coco betaine, lauryl hydroxy sultaine, coco aminopropyl hydroxy sultaine, lauryl amphoacetate and mixtures thereof, most preferably selected from coco betaine, lauryl hydroxy sultaine and mixtures thereof. Alkyl hydroxy sultaines are preferred, particularly lauryl hydroxy sultaine.

[0072] The amount of amphoteric or zwitterionic surfactants of general formula (II), (III), (IV) or (V) or mixtures thereof, preferably ranges from 1 to 6%, more preferably from 1.5 to 5%, most preferably from 2 to 3.5 % (based on the total weight of the composition and 100 % activity).

[0073] The amphoteric or zwitterionic surfactant is preferably selected from a betaine amphoteric surfactant of general formula (II), which is coco betaine, an amphoteric surfactant of general formula (III), which is lauryl hydroxy sultaine, and mixtures thereof, in an amount of from 1 to 4 % (by weight based on the total weight of the composition and 100 % activity).

[0074] The combined amount of (I) and (II) ranges from 4 to 20 wt %, preferably from 5 to 17 wt %, most preferably from 8 to 15 wt % (based on the total weight of the composition and 100 % activity).

[0075] The composition may comprise alpha olefin sulfonate in an amount ranging from 3.25 to 8% (by weight based on the total weight of the composition and 100 % active material); and an amphoteric or zwitterionic surfactant selected from coco betaine, lauryl hydroxy sultaine, coco aminopropyl hydroxy sultaine, lauryl amphoacetate or mixtures thereof, in an amount ranging from 1 to 4 % by weight of the composition.

[0076] The weight ratio of the alpha olefin sulfonate anionic surfactant to the amphoteric surfactant may range from 1:1 to 6:1, preferably from 1.5:1 to 5.

[0077] The anionic surfactants are typically present in the composition of the present invention at a level of from 1 to 30%, preferably from 3 to 20% and more preferably from 5 to 16%, by weight of the composition.

[0078] The amphoteric or zwitterionic surfactant may be selected from a group consisting of alkyl amine oxides, alkyl betaines, alkyl amidopropyl betaines, alkyl sulphobetaines (sultaines), alkyl amphoacetates, alkyl amphopropionates, alkyl amidopropyl hydroxysultaines, wherein the alkyl group has from 8 to 19 carbon atoms.It is preferred that the amphoteric or zwitterionic surfactant may be selected from a group consisting of lauryl amine oxide, cocodimethyl sulphopropyl betaine, lauryl betaine, cocamidopropyl betaine, sodium cocoamphoacetate, lauryl hydroxy sultaine, coco aminopropyl hydroxy sultaine, lauryl amphoacetate, more preferably selected from a group consisting of cocamidopropyl betaine, and lauryl hydroxy sultaine.

[0079] Furthermore preferably, the amphoteric surfactant is a betaine surfactant. It is preferred that the betaine surfactant is one of alkyl amidopropyl betaines. Cocamidopropyl betaine (CAPB) is particularly preferred.

[0080] In a preferred embodiment, the composition comprises from 0.1 to 10%, preferably from 0.5 to 8 %, more preferably from 1 to 5% of an amphoteric surfactant by weight of the composition.

[0081] The weight ratio of ethoxylated anionic surfactant to amphoteric surfactant may be less than 10:1, preferably from 2:1 to 10:1, more preferably from 3:1 to 9:1.

[0082] The total amount of surfactant in the composition of the invention is generally from 3 to 35%, preferably from 5 to 25%, most preferably from 7 to 16% by weight of the composition.

[0083] Hair care composition

[0084] The cosmetic composition of the present invention is a haircare composition, more preferably is a shampoo.

[0085] The composition of the invention preferably comprises a cosmetically acceptable carrier. It is preferred that the cosmetically acceptable carrier comprises water.

[0086] Shampoo compositions for use in the invention are generally aqueous, i.e. they have water or an aqueous solution or a lyotropic liquid crystalline phase as their major component. Suitably, the shampoo composition will comprise from 50 to 98%, preferably from 60 to 92% water by weight based on the total weight of the composition. Such compositions are referred to as having an aqueous base.

[0087] The hair care composition may comprise an additional scalp health agent to provide scalp benefits other than selenium sulfide. This group of materials is varied and provides a widerange of benefits including moisturization, barrier improvement, anti-fungal, anti-microbial and anti-oxidant, anti-itch, sensates, and anti-dandruff, etc.

[0088] The anti-dandruff agents can be selected from pyridinethione salts, zinc pyrithione, copper pyrithione, coal tar, sulfur, charcoal, zinc carbonate, hydroxy pyridines such as piroctone olamine, azoles such as ketoconazole or climbazole, hinokitiol, salicylic acid, and mixtures thereof.

[0089] The anti-microbial active can be selected from a group consisting of zinc pyrithione, copper pyrithione, sulfur, zinc carbonate, selenium sulfide, hinokitiol, hydroxamic acid such as caprylhydroxamic acid and benzohydroxamic acid, triclosan, whitfield's ointment, castellani's paint, aluminium chloride, gentian violet, hydroxyl pyridine and wherein the hydroxyl pyridine may be piroctone olamine, ciclopirox olamine, rilopirox, MEA-Hydroxyoctyloxypyridinone, strobilurins such as azoxystrobin and metal chelators such as 1,10-phenanthroline, potassium permanganate, sodium thiosulfate, propylene glycol, oil of bitter orange, urea preparations, griseofulvin, 8-hydroxyquinoline ciloquinol, thiobendazole, thiocarbamates, haloprogin, polyenes, hydroxypyridone, morpholine, benzylamine, allylamines (such as terbinafine), tea tree oil, clove leaf oil, coriander, palmarosa, berberine, thyme red, cinnamon oil, rosemary oil, cinnamic aldehyde, citronellic acid, ichthyol pale, Sensiva SC-50, Elestab HP-100, azelaic acid, lyticase, iodopropynyl butylcarbamate (IPBC), isothiazalinones such as octyl isothiazalinone, azoles such as ketoconazole or climbazole, benzimidazole, benzothiazole, bifonazole, butaconazole nitrate, clotrimazole, croconazole, eberconazole, econazole, elubiol, fenticonazole, fluconazole, flutimazole, isoconazole, lanoconazole, metronidazole, miconazole, neticonazole, omoconazole, oxiconazole nitrate, sertaconazole, sulconazole nitrate, tioconazole, thiazole, triazoles such as terconazole and itraconazole and mixtures thereof.

[0090] Other scalp health agents may include but are not limited to: niacinamide, glycerin, glycine, alanine, vitamin E and F, caffeine, panthenol, glycols, glycolic acid, PCA, PEGs, erythritol, lactates, hyaluronates, allantoin and other ureas, betaines, sorbitol, glutamates, xylitols, menthol, menthyl lactate, iso cyclomone, benzyl alcohol, natural extracts / oils including peppermint, spearmint, argan, jojoba and aloe.

[0091] The hair care composition may comprise from 0.01 to 10%, preferably from 0.1 to 5%, more preferably from 0.5 to 2% of the additional scalp health agent by weight of the composition.The hair care composition may additionally comprise a conditioning agent to provide conditioning benefit. Preferably, the hair care composition comprises discrete dispersed droplets of a water-insoluble conditioning agent, which has a mean droplet diameter (D3,2) of less than 15 microns, preferably less than 10 microns, more preferably less than 5 microns, most preferably less than 3 microns. The mean droplet diameter (D3,2) of a water-insoluble conditioning agent may be measured by means of a laser light scattering technique, for example using a 2600D Particle Sizer from Malvern Instruments.

[0092] The water-insoluble conditioning agent may include non-silicone conditioning agent comprising non-silicone oily or fatty materials such as hydrocarbon oils, fatty esters and mixtures thereof. Preferably, the water-insoluble conditioning agent is emulsified silicone oil.

[0093] Suitable silicones include polydiorganosiloxanes, in particular polydimethylsiloxanes which have the CTFA designation dimethicone. Also suitable for use in compositions of this invention (particularly shampoos and conditioners) are polydimethyl siloxanes having hydroxyl end groups, which have the CTFA designation dimethiconol. Also suitable for use in compositions of this invention are silicone gums having a slight degree of cross-linking, as are described for example in WO 96 / 31188. Preferably, the silicone oil comprises dimethicone, dimethiconol or a mixture thereof.

[0094] Suitable emulsified silicones for use in the hair care compositions of this invention are available as pre-formed silicone emulsions from suppliers of silicones such as Dow Corning and GE silicones. The use of such pre-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 may be prepared by a chemical emulsification process such as emulsion polymerisation, or by mechanical emulsification using a high shear mixer.

[0095] Examples of suitable pre-formed silicone emulsions include DC1785, DC1788, DC7128, all available from Dow Corning. These are emulsions of dimethiconol / dimethicone.

[0096] Another class of silicones which may be used are functionalized silicones such as amino functional silicones, meaning a silicone containing at least one primary, secondary or tertiary amine group, or a quaternary ammonium group. Examples of suitable amino functional silicones include polysiloxanes having the CTFA designation “amodimethicone.”The water-insoluble conditioning agent is generally present in hair care composition of this invention in an amount from 0.05 to 15%, preferably from 0.1 to 10%, more preferably from 0.5 to 8%, most preferably from 1 to 5%, based on total weight of the hair care composition.

[0097] Preferably the composition of the invention further comprises a suspending agent. Suitable suspending agents are selected from polyacrylic acids, cross-linked polymers of acrylic acid, copolymers of acrylic acid with a hydrophobic monomer, copolymers of carboxylic acidcontaining monomers and acrylic esters, cross-linked copolymers of acrylic acid and acrylate esters, heteropolysaccharide gums and crystalline long chain acyl derivatives. The long chain acyl derivative is desirably selected from ethylene glycol stearate, alkanolamides of fatty acids having from 16 to 22 carbon atoms and mixtures thereof. Ethylene glycol distearate and polyethylene glycol 3 distearate are preferred long chain acyl derivatives, since these impart pearlescence to the composition. Polyacrylic acid is available commercially as Carbopol 420, Carbopol 488 or Carbopol 493. Polymers of acrylic acid cross-linked with a polyfunctional agent may also be used; they are available commercially as Carbopol 910, Carbopol 934, Carbopol 941 and Carbopol 980. An example of a suitable copolymer of a carboxylic acid containing monomer and acrylic acid esters is Carbopol 1342. All Carbopol (trademark) materials are available from Goodrich.

[0098] Suitable cross-linked polymers of acrylic acid and acrylate esters are Pemulen TR1 or Pemulen TR2. A suitable heteropolysaccharide gum is xanthan gum, for example that available as Kelzan mu.

[0099] Mixtures of any of the above suspending agents may be used. Preferred is a mixture of crosslinked polymer of acrylic acid and crystalline long chain acyl derivative.

[0100] The suspending agent is generally present in hair care composition of this invention in an amount of from 0.1 to 10%, more preferably from 0.2 to 6%, and most preferably from 0.3 to 4%, based on total weight of the hair care composition and including all ranges subsumed therein.

[0101] Preservatives may also be incorporated into the hair care composition of this invention to protect against the growth of potentially harmful microorganisms. Suitable traditional preservatives include alkyl esters of parahydroxybenzoic acid, hydantoin derivatives, propionate salts, and a variety of quaternary ammonium compounds. Illustrative yet non-limiting examplesof the types of preservatives that may be used in this invention include, for examples, phenoxyethanol, sodium salicylate, methyl paraben, butyl paraben, propyl paraben, diazolidinyl urea, sodium dehydroacetate, benzyl alcohol, sodium benzoate, iodopropynyl butylcarbamate, caprylyl glycol, disodium EDTA or mixtures thereof. In an especially preferred embodiment, the preservative is sodium benzoate, phenoxyethanol, sodium salicylate ora mixture thereof.

[0102] Preservatives are preferably employed in amounts ranging from 0.01 to 2% by weight of the hair care composition.

[0103] It is further preferred that the hair care composition of the invention comprises a cosmetic ingredient. Preferably the cosmetic ingredient is selected from the group consisting of a silicone, an antibacterial agent other than antidandruff agents, a foam booster, a perfume, encapsulates (for example encapsulated fragrance) a dye, a colouring agent, a pigment, a preservative, a thickener, a protein, a phosphate ester, a buffering agent, a pH adjusting agent, a pearlescer (for example; mica, titanium dioxide, titanium dioxide coated mica, ethylene glycol distearate (INCI glycol distearate)) and / or opacifier, a viscosity modifier, an emollient, a sunscreen, an emulsifier, a sensate active (for example menthol and menthol derivatives), vitamins, mineral oils, essential oils, lipids, natural actives, glycerin, natural hair nutrients such as botanical extracts, fruit extracts, sugar derivatives and amino acids, microcrystalline cellulose and mixtures thereof.

[0104] Preferably, the composition of the present invention includes from 0.01 to 20 wt% of the at least one cosmetic ingredient, more preferably from 0.05 to 10 wt%, still more preferably from 0.075 to 7.5 wt% and most preferably, from 0.1 to 5 wt% of the at least one cosmetic ingredient, by weight of the total composition.

[0105] Method and Use

[0106] The present invention provides for a hair care composition of the first aspect for use in preventing or alleviating the symptoms of dandruff on the scalp or hair. Preferably, the use is non-therapeutic, preferably for cosmetic purpose.

[0107] The present invention also provides for a method of providing deposition of selenium sulfide on a topical surface of a human or animal body, comprising the step of applying the composition of the first aspect onto a topical surface of a human or animal body followed by rinsing the surfaces with water. It is non-therapeutic, preferably for cosmetic purpose.Mode of Use

[0108] The compositions of the invention are primarily intended for topical application to scalp or hair at least a portion of the hair or scalp of an individual, in rinse-off compositions.

[0109] When the composition is a shampoo, it is topically applied to the hair and then massaged into the hair and scalp. Then it is rinsed with water prior to drying the hair.

[0110] The invention will be further illustrated by the following, non-limiting Examples, in which all percentages quoted are by weight based on total weight unless otherwise stated.

[0111] The examples are intended to illustrate the invention and are not intended to limit the invention to those examples perse.

[0112] Examples

[0113] Example 1

[0114] This example demonstrated the selenium sulfide having specific mean particle size within the scope of the present invention with the presence of cationic polymer can deliver improved deposition of selenium sulfide from rinse-off composition. The compositions according to the formulations detailed in Table 1 are prepared. All ingredients are expressed by weight percent of the total formulation, and as level of active ingredient.

[0115] TABLE 1

[0116]

[0117]

[0118] a. Commercial guar hydroxypropyltrimonium chloride has a charge density of 0.85 to 1.05 and a weight average molecular weight from 1.0 to 1.5 million g / mol under the trade name BB-18 from Lamberti.

[0119] Method

[0120] About 0.2 grams of the test sample was taken on artificial skin (VITRO-SKIN from IMS testing group). This was diluted with 1.8 mL water and rubbed with a plastic rod for 30 seconds. The artificial skin surface was then rinsed twice with water, first time with 4 mL water for 30 second and then again with 4 mL water for 30 seconds. The deposition of selenium sulfide on the skin (10.75 cm2per plate) was measured using ICP method.

[0121] Results:

[0122] The average deposition (of five such experiments) are summarized in Table 2 (error represents standard deviation for duplicate measurements).

[0123] TABLE 2

[0124]

[0125] The observations tabulated in Tables 2 clearly indicates that Sample 1-3 comprising selenium sulfide having mean particle size within the scope of the present invention with the presence of cationic polymer showed improved deposition as compared to Samples A-B which is outside the scope of the present invention.Example 2

[0126] This example demonstrated selenium sulfide having specific mean particle size within the scope of the present invention with the presence of different cationic polymer can deliver improved deposition of selenium sulfide from rinse-off composition. The compositions according to the formulations detailed in Table 3 are prepared. All ingredients are expressed by weight percent of the total formulation, and as level of active ingredient.

[0127] TABLE 3

[0128]

[0129] b. Commercial acrylamidopropyltrimonium chloride / acrylamide copolymer has a charge density of 1.8 to 2.2 and a weight average molecular weight from 1.5 to 2.5 million g / mol under the trade name SP100 from Ashland

[0130] c. Commercial guar hydroxypropyltrimonium chloride has a charge density of 0.2 to 1.0 and a weight average molecular weight over 2.5 million g / mol under the trade name Naternal C14 from SYENSQO

[0131] Method

[0132] The same protocol was used to evaluate the deposition of selenium sulfide after treated with the compositions in Table 3 as described in Example 1.Results:

[0133] The average deposition (of five such experiments) are summarized in Table 4 (error represents standard deviation for duplicate measurements).

[0134] TABLE 4

[0135]

[0136] The observations tabulated in Tables 4 clearly indicates that Samples 4-7 comprising selenium sulfide having mean particle size within the scope of the present invention with the presence of different cationic polymers showed improved deposition.

[0137] Example 3:

[0138] This example demonstrated selenium sulfide having specific mean particle size in the composition having specific cationic polymer within the scope can deliver improved deposition of selenium sulfide from rinse-off composition comparing to the composition having cationic polymer outside the scope. The compositions according to the formulations detailed in Table 5 are prepared. All ingredients are expressed by weight percent of the total formulation, and as level of active ingredient.

[0139] TABLE 5

[0140]

[0141]

[0142] a. Commercial guar hydroxypropyltrimonium chloride has a charge density of 0.85 to 1.05 and a weight average molecular weight from 1.0 to 1.5 million g / mol under the trade name BB-18 from Lamberti.

[0143] b. Commercial acrylamidopropyltrimonium chloride / acrylamide copolymer has a charge density of 1.8 to 2.2 and a weight average molecular weight from 1.5 to 2.5 million g / mol under the trade name SP100 from Ashland.

[0144] d. Commercial polyquaternium 10 under the trade name of llcare polymer J P-30M from Dow Chemical.

[0145] Method

[0146] The same protocol was used to evaluate the deposition of selenium sulfide after treated with the compositions in Table 5 as described in Example 1.

[0147] Results:

[0148] The average deposition (of five such experiments) is summarized in Table 6.

[0149] TABLE 6

[0150]

[0151] The observations tabulated in Tables 6 clearly indicate that Samples 8-10 comprising selenium sulfide of the present invention with the presence of cationic polymers within the scope of the present invention showed improved deposition comparing to the composition without such cationic polymer or with cationic polymer outside the scope of the present invention (Samples C-D).

Claims

CLAIMS1. A hair care composition comprising:i) a surfactant;ii) a cationic polymer; andiii) selenium sulfide; wherein the mean particle size of the selenium sulfide is from 5 to 15 microns; wherein said cationic polymer is selected from cationic guar, copolymer comprising acrylamidopropyltrimonium chloride and mixture thereof; wherein said cationic polymer has molecular weight of 50,000 to 5,000,000 g / mol.

2. A composition as claimed in claim 1 wherein the selenium sulfide has a mean particle size from 5 to 13 microns.

3. A composition as claimed in claim 1 or 2 wherein said surfactant comprises an anionic surfactant, preferably selected from a group consisting of alkyl sulphates and alkyl ether sulphates having straight or branched alkyl chains and mixtures thereof.

4. A composition as claimed in any of claims 1 to 3 wherein said surfactant comprises anionic surfactant which is sulfate free.

5. A composition as claimed in any of claims 1 to 4 wherein the composition comprises a cosurfactant.

6. A composition as claimed in any of claims 1 to 5 wherein said cationic polymer has molecular weight of 50,000 to 5,000,000 g / mol and a charge density of from 0.1 to 7.0 meq / g.

7. A composition as claimed in any of claims 1 to 6 wherein the composition comprises 0.01 to 5% of selenium sulfide by weight of the composition.

8. A composition as claimed in any of claims 1 to 7 wherein the composition comprises 0.

019. A composition as claimed in any of claims 1 to 8 wherein the weight ratio of the amount of cationic polymer to that of said selenium sulfide is from 1 :20 to 10: 1.

10. A composition as claimed in any of claims 1 to 9 wherein the composition comprises 1 to 30%, preferably from 3 to 20%, more preferably from 5 to 16% of said surfactant by weight of the composition.

11. A composition as claimed in any of claims 1 to 10 wherein said composition comprises an additional scalp health agent.

12. A composition as claimed in any of claims 1 to 11 wherein said composition is a shampoo.

13. A composition as claimed in any of claims 1 to 12 for use in preventing or alleviating the symptoms of dandruff on the scalp or hair.

14. A non-therapeutic method of providing deposition of selenium sulfide on a topical surface of a human or animal body, comprising the step of applying the composition as claimed in any of claims 1 to 12 onto a topical surface of a human or animal body followed by rinsing the surfaces with water.

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