Hair conditioning composition

Abstract

The present invention relates to hair care compositions comprising a branched organopolysiloxane, an "oil-in-water" emulsion. Despite the prior art, there remains an opportunity to enhance the benefits provided by conditioning hair care compositions. There is a particular need for hair care compositions that can provide enhanced silicone deposition, particularly on damaged hair. Accordingly, it is an object of the present invention to provide a hair care composition that can provide enhanced silicone deposition on hair, particularly damaged hair. It has been found that this can be achieved by a hair care composition comprising a conditioning gel phase having an aqueous emulsion of a branched organopolysiloxane, the aqueous emulsion comprising an aqueous continuous phase of water and a cationic surfactant or a blend of a nonionic surfactant and a cationic surfactant, and a dispersed phase of a branched organopolysiloxane and a hydrocarbon oil, wherein the aqueous emulsion has a particle size Dv(50) of 5 microns or greater but less than 12 microns.

Description

[Technical field]

[0001] The present invention relates to hair care compositions comprising non-linear organopolysiloxane, "oil-in-water" emulsions. [Background technology]

[0002] Shampoos cleanse hair by removing excess dirt and sebum. However, shampooing can leave hair wet, tangled, and generally unmanageable. When hair dries, it is often left dry, rough, lackluster, or frizzy because the hair's natural oils and other natural conditioning and moisturizing ingredients are removed. If hair or parts of hair are damaged, shampooing will undoubtedly leave the hair in a worse condition than normal shampooed hair. A variety of approaches have been developed to condition hair. A common method of providing conditioning benefits to hair is through the use of conditioning agents such as cationic surfactants and polymers, high melting point fatty compounds, low melting point oils, silicone compounds, and mixtures thereof. Silicones are known and are one of the preferred conditioning agents.

[0003] Notwithstanding the prior art, there remains an opportunity to enhance the benefits provided by conditioning hair care compositions. There is a particular need for hair care compositions that can enhance silicone deposition, especially on damaged areas of the hair.

[0004] WO2016 / 041748 discloses a hair care composition obtainable by mixing a conditioning gel phase with an aqueous polydimethylsiloxane polymer emulsion, the conditioning gel phase being formed from a cationic surfactant, a fatty compound having a high melting point (above 25°C) and an aqueous carrier, the aqueous polydimethylsiloxane polymer emulsion having an aqueous continuous phase consisting of water and a mixture of nonionic and cationic surfactants and a dispersed phase consisting of a polydimethylsiloxane polymer and a hydrocarbon oil, the polydimethylsiloxane polymer having a kinetic viscosity of 50,000-110,000 cP at 25°C, the hydrocarbon oil having a kinetic viscosity of 1-35 cSt at 40°C and a specific gravity of 0.76-0.87 at 25°C, and the weight ratio of the polydimethylsiloxane polymer to the hydrocarbon oil being 45:55-70:30. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2016 / 041748 Summary of the Invention

[0006] It is therefore an object of the present invention to provide a hair care composition that can provide enhanced silicone deposition on hair.

[0007] Another object of the present invention is to provide a hair care composition that can provide enhanced silicone deposition on damaged hair.

[0008] Surprisingly, it has been found that the above objectives can be achieved by a hair care composition comprising an aqueous continuous phase of water and a cationic surfactant or a blend of a nonionic surfactant and a cationic surfactant, and a dispersed phase of a non-linear organopolysiloxane and a hydrocarbon oil, the aqueous emulsion having a particle size of Dv(50) of less than 12 microns.

[0009] Thus, in a first aspect, the present invention provides a compound of formula (RSiO 3 / 2 ) n The present invention provides a hair care composition comprising a conditioning gel phase having an aqueous emulsion of a branched organopolysiloxane comprising a copolymer segment of a polydialkylsiloxane and a monomer unit of a silsesquioxane having the formula: [wherein n=1 and R is an alkyl group, preferably methyl, ethyl or propyl], wherein the conditioning gel phase is formed from a cationic surfactant, a fatty compound having a high melting point (25° C. or higher), and an aqueous carrier, the aqueous emulsion of the branched organopolysiloxane comprises an aqueous continuous phase of water and a cationic surfactant or a blend of a nonionic surfactant and a cationic surfactant, and a dispersed phase of the branched organopolysiloxane and a hydrocarbon oil, and the aqueous emulsion has a particle size of Dv(50) of 5 microns or more and less than 12 microns.

[0010] In a second aspect, the present invention provides the use of a composition according to the invention for enhanced silicone deposition on damaged hair.

[0011] These and other aspects, features and advantages will become apparent to those skilled in the art upon reading the following detailed description and the appended claims. For the avoidance of doubt, any feature of one aspect of the present invention can be utilized in any other aspect of the present invention. 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. It should be noted that the examples set forth in the following description are intended to clarify the invention and are not intended to limit the invention to those examples themselves. Similarly, unless expressly stated otherwise, all percentages are weight / weight percentages. Except in the working examples and comparative examples, or unless expressly stated otherwise, all numbers in this description indicating amounts or reaction conditions of materials, physical properties of materials, and / or uses should be understood to be modified by the word "about". Numerical ranges expressed in the format "from x to y" are understood to include x and y. When multiple preferred ranges for a particular feature are described in the format "from x to y," it will be apparent that all ranges combining the different endpoints are also contemplated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Conditioning gel phase Examples of suitable cationic surfactants useful in forming the conditioning gel phase include quaternary ammonium cationic surfactants corresponding to the general formula: [ka]

[0013] During the ceremony, R 1 , R 2 , R 3 and R 4are each independently selected from (a) an aliphatic group of 1 to 22 carbon atoms, or (b) an aromatic, alkoxy, polyoxyalkylene, alkylamido, hydroxyalkyl, aryl, or alkylaryl group having up to 22 carbon atoms; and X is a salt-forming anion such as one selected from halide (e.g., chloride, bromide), acetate, citrate, lactate, glycolate, nitrate phosphate, sulfate, and alkyl sulfate groups.

[0014] 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.

[0015] Specific examples of such quaternary ammonium cationic surfactants of the above general formula are cetyltrimethylammonium chloride, behenyltrimethylammonium chloride (BTAC), cetylpyridinium chloride, tetramethylammonium chloride, tetraethylammonium chloride, octyltrimethylammonium chloride, dodecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, octyldimethylbenzylammonium chloride, decyldimethylbenzylammonium chloride, stearyldimethylbenzylammonium chloride, didodecyldimethylammonium chloride, dioctadecyldimethylammonium chloride, tallowtrimethylammonium chloride, cocotrimethylammonium chloride, dipalmitoylethyldimethylammonium chloride, PEG-2 oleylammonium chloride and salts thereof, where the chloride is replaced by another halide (e.g. bromide), acetate, citrate, lactate, glycolate, phosphate nitrate, sulfate, or alkyl sulfate.

[0016] In a preferred class of cationic surfactants of the above general formula, R 1 is C 16 ~C 22 R is a saturated or unsaturated, preferably saturated, alkyl chain of2 , R 3 and R 4 are each independently 3 and C.H. 2 CH 2 OH, preferably CH 3 is selected from.

[0017] Specific examples of such preferred quaternary ammonium cationic surfactants for use in forming the conditioning gel phase are cetyltrimethylammonium chloride (CTAC), behenyltrimethylammonium chloride (BTAC), and mixtures thereof.

[0018] Alternatively, a primary, secondary or tertiary fatty amine can be used in combination with an acid to provide a cationic surfactant suitable for providing a conditioning gel phase suitable for use in the present invention. The acid protonates the amine to form an amine salt in situ in the hair care composition. Thus, the amine is effectively a non-permanent quaternary ammonium or pseudo-quaternary ammonium cationic surfactant.

[0019] Suitable fatty amines of this type include amidoamines of the general formula: [ka]

[0020] In the formula, R 1 is a fatty acid chain containing 12 to 22 carbon atoms, and R 2 is an alkylene group containing 1 to 4 carbon atoms, R 3 and R 4 are each independently an alkyl group having 1 to 4 carbon atoms.

[0021] Specific examples of suitable materials of the above general formula include stearamidopropyl dimethylamine, stearamidopropyl diethylamine, stearamidoethyl diethylamine, stearamidoethyl dimethylamine, palmitamidopropyl dimethylamine, palmitamidopropyl diethylamine, palmitamidoethyl diethylamine, palmitamidoethyl dimethylamine, behenamidopropyl dimethylamine, behenamidopropyl diethylamine, behenamidoethyl diethylamine, behenamidoethyl dimethylamine, arachidamidopropyl dimethylamine, arachidamidopropyl diethylamine, arachidamidoethyl diethylamine, arachidamidoethyl dimethylamine, and diethylaminoethyl stearamide.

[0022] Also useful are dimethylstearamine, dimethylsoyamine, soyamine, myristylamine, tridecylamine, ethylstearylamine, N-tallowpropanediamine, ethoxylated (with 5 moles of ethylene oxide) stearylamine, dihydroxyethylstearylamine, and arachidylbehenylamine.

[0023] Particularly preferred is stearamidopropyl dimethylamine.

[0024] The acid used can be an organic acid or a mineral acid capable of protonating the amine in the hair care composition.Suitable acids include hydrochloric 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, fumaric acid, lactic acid, and mixtures thereof.

[0025] Mixtures of any of the above cationic surfactants may also be suitable.

[0026] The level of cationic surfactant is suitably in the range of 0.1 to 10% by weight, preferably 0.2 to 5% by weight, more preferably 0.25 to 4% by weight (by total weight of cationic surfactant based on the total weight of the hair care composition).

[0027] In the context of the present invention, "high melting point" generally means a melting point of 25° C. or higher. Generally, the melting point is in the range of 25° C. to 90° C., preferably 40° C. to 70° C., and more preferably 50° C. to about 65° C.

[0028] The high melting point fatty compound can be used as a single compound or as a blend or mixture of at least two high melting point fatty compounds. When a blend or mixture of fatty compounds is used, the melting point refers to the melting point of the blend or mixture.

[0029] Suitable fatty compounds of this type have the general formula RX, where R is an aliphatic carbon chain and X is a functional group (eg, an alcohol or a carboxylic acid or a derivative thereof such as an ester or amide).

[0030] R is preferably a saturated aliphatic carbon chain containing from 8 to 30 carbon atoms, preferably from 14 to 30 carbon atoms, more preferably from 16 to 22 carbon atoms.

[0031] In addition to carbon and hydrogen atoms, R can contain ether linkages and other groups such as amino groups. Preferably, R is a linear alkyl chain containing from 8 to 30 carbon atoms, preferably from 14 to 30 carbon atoms, more preferably from 16 to 22 carbon atoms.

[0032] X is preferably an --OH group.

[0033] Most preferably, the fatty compound has the general formula CH 3 (CH 2 ) n OH, and n is an integer from 7 to 29, preferably from 15 to 21.

[0034] Examples of suitable fatty alcohols are cetyl alcohol, stearyl alcohol, behenyl alcohol, and mixtures thereof, with cetyl alcohol, stearyl alcohol, and mixtures thereof being particularly preferred.

[0035] Mixtures of any of the above fatty compounds may also be suitable.

[0036] The level of fatty compounds is suitably in the range of 0.01 to 10% by weight, preferably 0.1 to 8% by weight, more preferably 0.2 to 7% by weight, most preferably 0.3 to 6% by weight (by total weight of fatty compounds based on the total weight of the hair care composition).

[0037] The weight ratio of cationic surfactant to fatty compound is suitably from 1:1 to 1:10, preferably from 1:1.5 to 1:8, optimally from 1:2 to 1:5.

[0038] The conditioning gel phase suitable for use in the present invention can be characterized as a gel consisting of surfactant bilayers (Lβ) surfactant mesophase.

[0039] In a typical process for preparing such conditioning gel phases, a cationic surfactant, a high melting point fatty compound, and an aqueous carrier are heated to form a mixture, which is cooled to room temperature under shear. The mixture undergoes a number of phase transitions during cooling, usually resulting in a gel (Lβ) surfactant mesophase consisting of surfactant bilayers. The bilayers may grow, swell, or fold to form elongated sheets or spherical vesicles.

[0040] Preferably, the formation of the gel (Lβ) surfactant mesophase is controlled by maintaining the temperature of the mixture so that it is within a specified range in the mixing vessel, generally within the range of about 55 to about 67° C.

[0041] In an example of such a preferred process, the fatty compound and the cationic surfactant can be "co-melted" in a first vessel to form an isotropic phase. The co-melt typically contains 45-90% by weight of a fatty compound having the general formula CH 3 (CH 2 ) n OH (wherein n is an integer of 7 to 29, preferably 15 to 21); 10 to 40% by weight of a fatty alcohol of the general formula [N(R 1 )(CH3 ) 3 ] + (X) - Cationic surfactant (wherein R 1 is C 16 ~C 22 and X is a saturated alkyl chain of 100 to 150° C.; and 0 to 15% by weight of water (by weight based on the total weight of the co-melt). The co-melt in the first vessel is typically maintained at a temperature sufficient to maintain the fatty compounds in the liquid phase, usually about 80 to 85° C. The co-melt is then added to a second vessel containing water at about 50 to about 60° C., and the co-melt and water are allowed to mix. In the second vessel, the temperature of the co-melt and water mixture is controlled so that it is maintained at 56 to 65° C., preferably 58 to 62° C., and more preferably about 60° C. The cationic surfactant component of such a co-melt may also include or consist of a fatty amidoamine of the general formula: [ka]

[0042] In the formula, R 1 is a fatty acid chain containing 12 to 22 carbon atoms, and R 2 is an alkylene group containing 1 to 4 carbon atoms, R 3 and R 4 are each independently an alkyl group having 1 to 4 carbon atoms. In this case, the water in the second container will suitably contain 0.01 to 3% by weight of an organic or mineral acid capable of protonating the fatty amidoamine.

[0043] In another example of a preferred process, a "co-melt" (such as that described above) and water can be added independently to a mixing vessel and mixed in a continuous process in which the temperature of the co-melt and water mixture is controlled by varying the temperature of the water added to the mixture. The water can be added in a single portion or in small portions. Typically, a first water vessel is maintained at about 40° C. and pumped into the mixing vessel while a second water vessel is maintained at a temperature sufficient to change the temperature of the water and co-melt mixture to be within the required range as described above.

[0044] In another example of a preferred process, the fatty compound and the cationic surfactant can be combined in an aqueous dispersion. According to this process, an aqueous dispersion is prepared, which typically comprises 25-50% by weight water, 4-20% by weight of a cationic surfactant having the general formula CH 3 (CH 2 ) n OH (n is an integer of 7 to 29, preferably 15 to 21), a fatty alcohol; and 1 to 5% by weight of a fatty amidoamine of the following general formula: [ka]

[0045] In the formula, R 1 is a fatty acid chain containing 12 to 22 carbon atoms, and R 2 is an alkylene group containing 1 to 4 carbon atoms, R 3 and R 4 are each independently an alkyl group having 1 to 4 carbon atoms (by weight based on the total weight of the dispersion). Preferably, the temperature of the aqueous dispersion is maintained above the melting point of the fatty alcohol, preferably at least 5° C. above the melting point of the fatty alcohol. Next, 1 )(CH 3 ) 3 ] + (X) - Cationic surfactant (R 1 is C 16 ~C 22 and X is a halide.) can be added and mixed into the aqueous dispersion at a level generally between 0.5 and 5% by weight (by weight based on the total weight of the mixture).

[0046] Preferably, the mixing of the cationic surfactant and the aqueous dispersion is monitored by measuring the viscosity so that mixing is complete when the viscosity changes to a plateau (generally about 20-60 minutes after mixing). After mixing is complete, the fatty amidoamine is neutralized with a suitable acid as described above. Preferably, the temperature of the mixture of the aqueous dispersion and the cationic surfactant is maintained at 56-67°C, preferably 58-65°C, more preferably about 63°C. Preferably, the process is a batch process.

[0047] Another preferred process for making a conditioning gel phase suitable for use in the present invention is to use a cationic surfactant (typically of the general formula [N(R 1 )(CH 3 ) 3 ] + (X) - ;R 1 is C 16 ~C 22 and X is a halide; and forming an isotropic aqueous solution of the cationic surfactant with a molten fatty compound (typically a compound of the general formula CH 3 (CH 2 ) n OH fatty alcohol; n is an integer from 7 to 29, preferably 15 to 21. Typically, the fatty alcohol is maintained at a temperature sufficient to maintain it in a liquid phase (usually about 80-85°C) prior to addition to the isotropic aqueous solution of the cationic surfactant. Preferably, the temperature of the mixture of fatty alcohol and isotropic aqueous solution is maintained at 55°C to 65°C, more preferably 58°C to 62°C, and most preferably about 60°C.

[0048] Aqueous non-linear organopolysiloxane emulsion The hair care composition of the present invention is obtained by mixing a conditioning gel phase with an aqueous emulsion having an aqueous continuous phase consisting of water and a cationic surfactant or a blend of nonionic and cationic surfactants, and an internal dispersed phase consisting of a non-linear organopolysiloxane and a hydrocarbon oil. Preferably, the weight ratio of organopolysiloxane to said oil is 40:60 to 65:35, more preferably 50:50 to 65:35, even more preferably 55:45 to 65:35, and most preferably 60:40.

[0049] The non-linear organopolysiloxane of the present invention has the formula (RSiO 3 / 2 ) n Silsesquioxane monomer units having the formula: [In the formula, n=1; R is an alkyl group, preferably methyl, ethyl or propyl, more preferably methyl. and a copolymer portion of a polydialkylsiloxane, where the alkyl group is preferably methyl and the end group is preferably -OH; the most preferred polydialkylsiloxane is dimethiconol. Includes.

[0050] The weight average molecular weight of the organopolysiloxane of the present invention, as measured using gel permeation chromatography, is preferably greater than 700,000 Da, more preferably greater than 800,000 Da, even more preferably greater than 900,000 Da, even more preferably greater than 950,000 Da, and most preferably greater than 10,000,000 Da, but typically less than 1,400,000 Da, preferably less than 1,200,000 Da. For the avoidance of doubt, the unit Dalton (Da) is also known as the unified atomic mass unit (u).

[0051] A stress-controlled rheometer MCR501 (Anton Paar, Austria) with parallel geometry was used to characterize the organopolysiloxane / hydrocarbon blends. Tests were performed at a temperature of 20 °C over a frequency window from 100 Hz to 0.1 Hz with a gap size of 0.5 mm and a fixed strain of 0.5%. Excess sample at the plate edges was trimmed. After loading, the samples were left for 60 seconds for stress relaxation. Data were collected in logarithmic steps of 10 points per decade. The storage modulus of the dispersed phase containing nonlinear organopolysiloxane and hydrocarbon oil is sensitive to the weight ratio of organopolysiloxane:oil and is 1 × 10 at 10 Hz for the weight ratios specified above. 2 Pa~2×10 3 The pressure can be in the range of Pa.

[0052] The rheology of the organopolysiloxane was also characterized after evaporation of the hydrocarbons. In these measurements, the mass was followed over time as the hydrocarbons evaporated. Once the mass showed no hydrocarbons remaining, the organopolysiloxane sample was characterized as described above.

[0053] Preferably, the non-linear organopolysiloxane has a viscosity of 2×10 measured at 10 Hz. 3 Pa~3×10 4 Pa, preferably 8 x 10 3 Pa~2×10 4 Pa, more preferably 1×10 4 Pa~1.6×10 4 It has a storage modulus in the range of Pa.

[0054] WO 2015 / 122989 and US 2012 / 022210, which are incorporated herein by reference, describe methods for preparing aqueous emulsions of the branched organopolysiloxanes and organopolysiloxanes of the present invention.

[0055] Without wishing to be bound by theory, it is believed that at the molecular level, multiple types of topological structures are obtained from the polycondensation reaction between a branching agent that contains more than two reactive groups per molecule and a linear precursor molecule that contains an average of two functional groups.Therefore, the organopolysiloxane of the present invention is described in WO2015 / 122989 and US2012 / 022210 as non-linear organopolysiloxane to define the product of such reaction.Such reaction products can include multiple types of topological polymer structures known in the art.Such structures include, for example, branched ones.

[0056] The non-linear organopolysiloxanes of the present invention are branched organopolysiloxanes.

[0057] Suitable hydrocarbon oils in the context of the present invention include saturated non-polar straight or branched chain aliphatic or alicyclic hydrocarbons having from about 10 to about 50 carbon atoms, and mixtures thereof.

[0058] Preferred hydrocarbon oils in the context of the present invention are light mineral oils and isohexadecane.

[0059] Mineral oil is a clear oily liquid obtained from petroleum, from which the waxes and more volatile fractions are removed by distillation. The fractions distilled at temperatures between 250°C and 300°C are called mineral oils, which consist of a mixture of hydrocarbons, the number of carbon atoms per hydrocarbon molecule generally being C 10 ~C 40 The range is.

[0060] Mineral oil can be characterized in terms of its viscosity, with light mineral oils being lower in viscosity than heavy mineral oils. Suitable light mineral oils generally have a kinematic viscosity of 3.9 to 5.0 cSt at 40° C. and a specific gravity of 0.810 to 0.830 at 25° C. Such materials are commercially available under the trade name Lytol®.

[0061] Isohexadecane, such as that supplied under the trade name Permethyl 101A available from Presperse Inc., NJ, USA, is suitable for use in the present invention and has the molecular formula C 16 H 34 It is a colorless liquid with a boiling point of about 240 °C.

[0062] It is important to the practice of the present invention that in the dispersed phase, both the non-linear organopolysiloxane and the hydrocarbon oil are within the same droplets, rather than being a mixture of two different emulsions.

[0063] In a preferred embodiment, the aqueous emulsions used in the present invention have an aqueous continuous phase comprising a blend of a nonionic surfactant, such as an alkyl polyethylene glycol ether, e.g., PEG-7 propylheptyl ether, and a cationic surfactant, such as cetyltrimethylammonium chloride.

[0064] The total amount of surfactant used will vary depending on the particular surfactant selected and the target composition of the emulsion, but will generally range from 0.84 to 2.51% by weight of the aqueous emulsion. The internal dispersed phase comprising the organopolysiloxane and hydrocarbon within the aqueous emulsion may range from 50% to 73% by weight of the emulsion.

[0065] The selection of other surfactants typically applied when emulsifying silicones can also be applied to the components of the internal dispersed phase of the present invention described above without adversely affecting performance (as this performance is derived from the action of the internal phase deposited on the hair). For example, it is conceivable to use only cationic emulsifying surfactants without using nonionic emulsifying surfactants.

[0066] The weight percent of the conditioner formulation represented by the internal dispersed phase of the emulsion may range from 0.05 to 3.5%, preferably from 0.1 to 3%, more preferably from 0.2 to 2.75%, even more preferably from 0.5 to 2.5%.

[0067] One of the characteristics of an emulsion is the particle size. This can be measured, for example, by laser diffraction particle size analysis, which is well documented in the art. There are several parameters that can be used to characterize the particle size of an emulsion. For example, the parameter Dv(50) represents the upper limit for the range of particle diameters within which 50% of the population of all dispersed materials falls.

[0068] The aqueous emulsions of the present invention have a particle size with a Dv(50) value of at least 5 microns to less than 12 microns, more preferably at least 6 microns or at least 7 microns, but typically no more than 11 microns, preferably no more than 10 microns, more preferably no more than 8 microns, even more preferably no more than 7 microns, and even more preferably no more than 6 microns.

[0069] The aqueous emulsions of the present invention have a particle size of from 5 microns to less than 12 microns Dv(50), preferably from 7 microns to less than 12 microns Dv(50).

[0070] As particle size increases, the potential for a coating feel on the hair which consumers dislike becomes more important, for this reason it is preferred to limit the particle size to a Dv(50) of less than 12 microns.

[0071] The particle size of the emulsions can be controlled by methods known to those skilled in the art. The emulsions of the present invention and the comparative emulsions were characterized using laser diffraction particle size measurement, more specifically using a Malvern Instruments Mastersizer 2000 particle size analyzer equipped with a Hydro 2000SM dispersion unit (Malvern Instruments, UK).

[0072] Product Form and Optional Ingredients The hair care compositions of the present invention are primarily intended for topical application to the hair and / or scalp of a subject to improve hair properties such as lubrication, smoothness, softness, manageability, as well as bodyification, shapeability and shine of the hair fiber.

[0073] The hair care compositions of the present invention are typically "rinse-off" compositions that are applied to the hair and then partially rinsed off.

[0074] A particularly preferred product form is a conditioner for hair treatment (usually after shampooing) and subsequent rinsing.

[0075] Generally, such compositions are applied to hair (preferably hair that has been shampooed and then rinsed with water) and then worked through the hair. The composition is then preferably allowed to penetrate the hair for about 1 to 3 minutes before being rinsed from the hair with water. Typically, about 1 g to about 50 g of the composition is applied to the hair or scalp.

[0076] The hair care compositions of the present invention generally contain from about 20% to about 95% water by weight based on the total weight, preferably at least 30%, more preferably at least 40%, even more preferably at least 50%, even more preferably at least 60% or at least 70%, but typically not more than 94%, preferably not more than 93%, more preferably not more than 92%, even more preferably not more than 91%, even more preferably not more than 90%, or even not more than 80% by weight. Other organic solvents such as lower alkyl alcohols and polyhydric alcohols may also be present. Examples of lower alkyl alcohols include C 2 alkoxysilanes such as ethanol and isopropanol. 1 ~C 6 Examples of polyhydric alcohols include propylene glycol, hexylene glycol, glycerin, and propanediol. Mixtures of any of the above organic solvents can also be used.

[0077] The hair care compositions of the present invention may also incorporate other optional ingredients to enhance performance and / or consumer acceptance. Suitable optional ingredients include, but are not limited to, preservatives, colorants, chelating agents, antioxidants, fragrances, antimicrobial agents, antidandruff agents, cationic conditioning polymers, styling ingredients, sunscreens, proteins and hydrolyzed proteins.

[0078] In a second aspect, the invention relates to the use of a composition according to the invention for enhanced silicone deposition on damaged hair.

[0079] Enhanced deposition of silicone on damaged surfaces of hair provides an advantage since it targets the silicone to areas where it is needed and does not unnecessarily coat areas that require less conditioning. Delivery of silicone to non-damaged areas can contribute to a heavy, coating feel that is undesirable to users of the product.

[0080] The invention will now be further described by reference to the following examples in which all percentages are by weight based on total weight unless otherwise specified. EXAMPLES

[0081] Example 1: Effect of the composition of the present invention on silicone deposits Hair conditioning compositions were prepared having the ingredients shown below in Table 1. Conditioner Examples 1, 2, 3, 4 and 5 represent compositions according to the present invention.

[0082] In Table 1, Example Emulsions 1, 2, 3, 4, and 5 represent aqueous organopolysiloxane emulsions according to the present invention. Example Emulsions 1-5 are emulsions of branched organopolysiloxane / isohexadecane with cetyltrimethylammonium chloride, PEG-7 propylheptyl ether (e.g., Dow Corning) with varying particle sizes. The aqueous emulsion of Example Emulsion 1 has a particle size of 1.5 microns Dv(50). The aqueous emulsion of Example Emulsion 2 has a particle size of 2.6 microns Dv(50). The aqueous emulsion of Example Emulsion 3 has a particle size of 4.2 microns Dv(50). The aqueous emulsion of Example Emulsion 4 has a particle size of 7.16 microns Dv(50). The aqueous emulsion of Example Emulsion 5 has a particle size of 11.03 microns Dv(50).

[0083] In example emulsions 1, 2, 3, 4 and 5, the weight ratio of branched organopolysiloxane to hydrocarbon oil (isohexadecane) is 60:40.

[0084] To evaluate the performance of these products on hair, the hair was first washed with a solution of 14% sodium lauryl ether sulfate (1EO) to remove any existing deposits. The deposition achieved from each of the formulation examples in Table 1 was compared to the deposition achieved from comparative example Conditioner A.

[0085] Comparative Conditioner A comprises a comparative emulsion comprising an aqueous emulsion of a 9:1 blend of dimethicone and amodimethicone having a particle size of approximately 3 microns Dv(50) (ex. Dow Corning).

[0086] Comparative Conditioner B comprises an emulsion of dimethicone / mineral oil with a particle size of 2.5 microns Dv(50) and cetyltrimethylammonium chloride and water according to WO2016 / 041748 (e.g., Dow Corning).

[0087] [Table 1]

[0088] evaluation The conditioner compositions of Examples 1 to 5 and Comparative Example A were evaluated as follows.

[0089] All tests reported here used a standardized consumer-relevant application protocol in which the product was applied to the hair for a set period of time, then rinsed for a set period of time, and left to dry. To quantify silicone deposition from the product onto the hair, 2.5 g hair swatches were first washed with an aqueous solution of 14% sodium lauryl ether sulfate (1EO). 0.1 g of solution per gram of hair was applied from a syringe and massaged into wet hair with the hands for 30 seconds, then rinsed with tap water at a flow rate of 4 liters / min. This process was repeated once more before application of the example conditioner or the comparative conditioner. 0.2 g of conditioner / g of hair was applied from a syringe to freshly washed and rinsed hair, massaged for 1 minute, and then rinsed for 1 minute. The treated switches were dried at 50°C for 1-2 hours before silicone deposition was measured.

[0090] result The silicone deposit was quantified using X-ray fluorescence technique to detect elemental silicon contained within the conditioning active material.

[0091] Data is captured as parts per million of silicon based on the weight of hair. Deposition efficiency can be calculated by looking at the ppm that would be achieved if all of the applied silicon remained on the hair after the conditioner product was rinsed off. A deposition efficiency of 1 would indicate that all of the silicon in the formula was deposited on the hair surface and remained there after rinsing. Deposition efficiency data is provided in Table 2 for each conditioner formula, for virgin and bleached hair types. Bleached hair is used as an example of hair that is damaged due to chemical modifications and therefore in need of conditioning.

[0092] [Table 2]

[0093] The data above shows that when comparing an example formulation (Example Conditioner 2) having approximately the same particle size as Comparative Conditioner A, the silicone deposition efficiency on virgin hair is approximately the same as Comparative Conditioner A. However, the data in Table 2 also shows that when comparing an example formulation (Example Conditioner 2) having approximately the same particle size as Comparative Conditioner A, the silicone deposition efficiency on bleached hair is significantly greater than Comparative Conditioner A, and further, the larger the emulsion particle size in the example formulation, the greater the deposition efficiency on bleached hair.

[0094] Deposition of silicones from hair conditioners onto bleached hair is typically more difficult than onto virgin hair, and deposition is generally less efficient on the former compared to the latter.

[0095] Best results for silicone deposition efficiency on bleached hair can be seen with an aqueous emulsion particle size of Dv(50) of 5 microns or more and less than 12 microns.

[0096] Example 2: The compositions of Conditioner Examples 2, 5 and Comparative Conditioner B were evaluated as follows.

[0097] Half Head Salon Exam Thirty-six panelists with dry to dry and damaged hair types of varying lengths and textures were recruited for testing in a dedicated salon facility. The test protocol used a stripping shampoo applied to both sides of each panelist's head, and then each composition was compared to a control in a half-head salon test. The compositions were evaluated by expert evaluators for the attributes detailed in Table 3 below. Some attributes were considered beneficial and others were considered negative. Smoothness is a beneficial attribute, while frizz and dryness are negative attributes. In all cases where differences were recorded, Example 5 scored higher than Example 2 and Comparative Conditioner B for smoothness (a beneficial attribute) and lower than Example 2 and Comparative Conditioner B for frizz and dryness (negative attributes).

[0098] [Table 3]

[0099] · The x in x / y indicates the score for the control product, and the y in x / y indicates the score for the test product. The control product was a conditioner containing standard silicones similar to Comparative Example Conditioner A.

Claims

1. Formula: (RSiO ３／２ ) ｎ [In the formula, n=1, R is methyl, ethyl or propyl.

1. A hair care composition comprising a conditioning gel phase having an aqueous emulsion of a branched organopolysiloxane comprising copolymer segments of a polydialkylsiloxane and monomer units of a silsesquioxane having the formula: the conditioning gel phase is formed from a cationic surfactant, a fatty compound having a high melting point (above 25°C), and an aqueous carrier; the aqueous emulsion of the branched organopolysiloxane comprises an aqueous continuous phase of water and a cationic surfactant or a blend of a nonionic surfactant and a cationic surfactant, and a dispersed phase of the branched organopolysiloxane and a hydrocarbon oil; the aqueous emulsion having a particle size of Dv(50) of 5 microns or more but less than 12 microns; The branched organopolysiloxane belongs to non-linear organopolysiloxane, the alkyl group of the copolymer segment of the polydialkylsiloxane is methyl; the dispersed phase is in the range of 0.2 to 3.5% by weight of the hair care composition; The level of cationic surfactant ranges from 0.1 to 10 wt. % (by total weight of cationic surfactant based on the total weight of the hair care composition); Hair care compositions.

2. 2. The hair care composition of claim 1, wherein the aqueous emulsion has a particle size with a Dv(50) of 7 microns or greater but less than 12 microns.

3. 3. The hair care composition of claim 1, wherein the weight ratio of the branched organopolysiloxane to the hydrocarbon oil is from 40:60 to 65:

35.

4. 4. The hair care composition of claim 1, wherein the weight ratio of the branched organopolysiloxane to the hydrocarbon oil is from 50:50 to 60:

40.

5. 5. The hair care composition of claim 1, wherein the weight ratio of the branched organopolysiloxane to the hydrocarbon oil is 60:

40.

6. The branched organopolysiloxane had a molecular weight of 2×10 measured at 10 Hz using a stress-controlled rheometer MCR501 (Anton Paar, Austria) with parallel geometry, run at a gap size of 0.5 mm and a fixed strain of 0.5% over the frequency window from 100 Hz to 0.1 Hz at 20° C. ３ Pa ~ 3 x 10 ４ The hair care composition according to any one of claims 1 to 5, having a storage modulus of 100 Pa.

7. A hair care composition according to any one of claims 1 to 6, wherein the hydrocarbon oil is isohexadecane or mineral oil.

8. A hair care composition according to any one of claims 1 to 7, wherein the cationic surfactant used to form the conditioning gel phase is selected from cetyltrimethylammonium chloride (CTAC), behenyltrimethylammonium chloride (BTAC), protonated stearamidopropyl dimethylamine and mixtures thereof.

9. A hair care composition according to any one of claims 1 to 8, wherein the fatty compounds used to form the conditioning gel phase are selected from cetyl alcohol, stearyl alcohol and mixtures thereof.

10. Use of a composition according to any one of claims 1 to 9 for enhanced silicone deposition on damaged hair.

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