HK1195875A

HK1195875A - Method for preparing personal care composition comprising surfactant system and high melting point fatty compound

Info

Publication number: HK1195875A
Application number: HK14109345.7A
Authority: HK
Inventors: 冈田俊之; 前田晶子
Original assignee: 宝洁公司
Priority date: 2011-09-15
Filing date: 2012-09-14
Publication date: 2014-11-28

Description

Method of making personal care compositions comprising a surfactant system and a high melting point fatty compound

Technical Field

The present invention relates to a process for preparing a personal care composition comprising the step of mixing a hot oil phase and a cold water phase in a high shear field to form an emulsion, wherein the mixing step is performed by using a homogenizer having a rotating member, wherein the oil phase comprises from 0 to about 50% by weight of the oil phase of an aqueous carrier, and wherein the temperature of the emulsion, when formed, is from about 10 ℃ to about 40 ℃.

Background

Various processes have been developed to prepare personal care compositions comprising a surfactant and a high melting point fatty compound, and an aqueous carrier.

A common method of preparation of such compositions is emulsification. Such emulsification is performed by various protocols, various temperatures, and various homogenizers.

For example, WO2004/054693 discloses in example 13 a hair conditioner prepared by the steps of: preparing an aqueous phase at 24-46 ℃, said aqueous phase comprising 46.785% water, 0.3% potassium chloride, and 0.1% disodium ethylenediaminetetraacetate; preparing an oil (emulsion) phase comprising 41.785% water, 0.15% distearyldimethylammonium chloride, 0.84% cetyltrimethylammonium chloride and 3.0% cetyl alcohol at 65-88 ℃; delivering the phases through a pipe which is ultimately connected to a blending pipeThe antechamber section of (a); and homogenizing the blend.

WO2009/158440 relates to hair conditioning compositions comprising behenyl trimethyl ammonium methyl sulfate and having a higher yield point. The publication discloses on pages 6 and 7 that the composition is preferably substantially free of di-long alkyl cationic surfactants in light of the improved wet conditioning benefits.

WO2010/077707 relates to a process for preparing a personal care composition by feeding an oil phase and/or an aqueous phase directly into a high shear field. The publication also discloses on page 10 that the composition is preferably substantially free of di-long alkyl cationic surfactants for improved wet conditioning benefits.

However, there remains a need for methods of making hair conditioning compositions and other personal care compositions comprising di-long alkyl cationic surfactants to effectively convert surfactants and fatty compounds into emulsions without compromising wet conditioning benefits.

There may still be a need for such a process, which provides personal care compositions with, for example, the following properties by such an effective conversion: (i) effective delivery of conditioning benefits to hair and/or skin, e.g., improved conditioning benefits delivered by the same amount of active ingredients such as surfactants and fatty compounds; (ii) improved product appearance, i.e., a fuller, thicker, and/or more concentrated product appearance, and which consumer can perceive a higher conditioning benefit from its appearance; (iii) a uniform product appearance suitable for use as a product on the market; and/or (iv) rheological properties suitable for use as products on the market, and/or improved stability of such rheological properties.

Furthermore, in addition to the above needs, there may be a need for such methods that provide greater manufacturing operational flexibility and/or require less investment for high pressures.

None of the prior art provides all of the advantages and benefits of the present invention.

Disclosure of Invention

The present invention relates to a method of making a personal care composition,

wherein the composition comprises: a cationic surfactant system comprising a mono alkyl quaternary ammonium cationic surfactant and a dialkyl cationic surfactant; a high melting point aliphatic compound; and a carrier which contains water, wherein the carrier contains water,

wherein the method comprises the steps of:

(1) preparing an oil phase comprising a surfactant and a high melting point fatty compound, wherein the temperature of the oil phase is above the melting point of the high melting point fatty compound; and

(2) preparing an aqueous phase comprising an aqueous carrier, wherein the temperature of the aqueous phase is below the melting point of the high melting point fatty compound; and

(3) mixing the oil phase and the aqueous phase to form an emulsion; wherein the mixing step (3) comprises the following detailed steps:

(3-1) feeding either the oil phase or the aqueous phase to a reactor having a volume of about 1.0X 10²J/m³Or higher energy density high shear fields;

(3-2) feeding the other phase directly to the field; and

(3-3) forming an emulsion;

performing the mixing step (3) by using a homogenizer having a rotating member;

wherein the oil phase comprises from 0 to about 50%, by weight of the oil phase, of the aqueous carrier; and is

Wherein the temperature of the emulsion, when formed, is from about 10 ℃ to about 40 ℃.

The process of the present invention effectively converts surfactants and fatty compounds into emulsions.

These and other features, aspects, and advantages of the present invention will become better understood upon reading the following description and appended claims.

Detailed Description

While the specification concludes with claims particularly pointing out and distinctly claiming the invention, it is believed that the present invention will be better understood from the following description.

Herein, "comprising" means that other steps and other ingredients which do not affect the end result can be added. The term encompasses the terms "consisting of …" and "consisting essentially of …".

All percentages, parts and ratios are based on the total weight of the composition of the present invention, unless otherwise specified. All such weights as they pertain to listed ingredients are based on the active level and, therefore, do not include carriers or by-products that may be included in commercially available materials.

As used herein, "mixture" is meant to include simple combinations of substances as well as any compounds resulting from their combination.

Manufacturing method

wherein the method comprises the steps of:

(3-2) feeding the other phase directly to the field; and

(3-3) forming an emulsion;

performing the mixing step (3) by using a homogenizer having a rotating member;

Preferably, the method further comprises the step of adding additional ingredients (if included) to the emulsion, such as silicone compounds, fragrances, preservatives, polymers. Preferably, the emulsion is a gel matrix, as described below under the heading "gel matrix".

Details of mixing step (3)

In the present invention, the oil phase and the aqueous phase are first met in a high shear field by feeding the phases directly into the high shear field. It is believed that the process of the present invention provides improved conversion of surfactant and high melting point fatty compound to an emulsion by first meeting in a high shear field, i.e., the resulting composition contains a reduced amount of non-emulsifying surfactant/high melting point fatty compound compared to other processes where such phases are first met in a non-shear field or a lower shear field. It is also believed that by this improved conversion to an emulsion, the methods of the present invention provide improved conditioning benefits to the resulting compositions, and may also provide them with improved product appearance and/or product stability.

In the present invention, "direct feeding" means that, in order to improve the conversion into an emulsion, the two phases are fed so that the two phases can reach the high shear field within 0.52 seconds or less, preferably 0.5 seconds or less, more preferably 0.3 seconds or less, still more preferably 0.1 seconds or less, and even more preferably 0 seconds after the first encounter. In the present invention, direct feeding is preferably carried out by direct injection.

In the present invention, "high shear field" means that the field has about 1.0X 10 in order to improve the conversion into an emulsion²J/m³Preferably about 1.0X 10³J/m³More preferably about 1.0X 10⁴J/m³And to about 5.0X 10⁸J/m³Preferably to about 2.0X 10⁷J/m³More preferably to about 1.0X 10⁷J/m³The energy density of (1).

In the present invention, the mixing step (3) preferably includes the following detailed steps:

(3-1) feeding the aqueous phase to have a particle size of 1.0X 10²J/m³Or higher energy density high shear fields;

(3-2) feeding the oil phase directly into the field; and

(3-3) forming an emulsion.

In the present invention, especially when using a homogenizer with rotating members as described in detail below, in order to stably produce a composition of improved conditioning benefits, it is preferred to feed the oil phase into a high shear field in which the aqueous phase is already present.

In the present invention, the mixing step (3) including the detailed steps (3-1) and (3-2) is preferably performed by using a high shear homogenizer.

Known high shear homogenizers include, for example: a high shear homogenizer having a rotating member; and a high pressure homogenizer. In the present invention, a high shear homogenizer with rotating members is used instead of a high pressure homogenizer, such as those available from Sonic CorporationManton Gaulin type homogenizers available from APV Manton Corporation, and microfluidizers available from Microfluidics Corporation. It is believed that such high shear homogenizers with rotating members: greater is provided by its two independent levers (flow and rotational speed)Manufacturing operational flexibility, while high-pressure homogenizers have only one rod (pressure determined by flow); and/or require less investment for high pressure.

To improve conversion to emulsion, high shear homogenizers with rotating members useful herein include, for example, direct injection rotor-stator homogenizers such as: from A. Berents Gmbh according to improved conversion to emulsion&Of CoAnd Lexa-30 from Indolalival/TetraPac. These direct injection rotor-stator homogenizers are preferred because when used as is, the two phases are able to reach the high shear field quickly after the first encounter, compared to other homogenizers with rotating members. Such other homogenizers having a rotating member include, for example: a k. tube homomixer from Primix Corporation, and DR-3 from IKA Corporation. Those other homogenizers having rotating members can be modified for use so that the two phases can reach the high shear field quickly after the first encounter. Such other homogenizers with rotating members, when used as is, can provide increased amounts of high melting point fatty compound crystals in the composition that are not converted to an emulsion. Other homogenizers with lower energy density, such as the t.k. tube homomixer, can also provide such an increased amount of high melting point fatty compound crystals.

Details of temperature conditions

In the present invention, the oil phase has a higher melting point than the high melting point fatty compound. Preferably, the oil phase has a higher melting point than the oil phase. When mixed with the aqueous phase, the oil phase preferably has a temperature of from about 25 ℃, more preferably about 40 ℃, still more preferably about 50 ℃, even more preferably about 55 ℃, still more preferably about 66 ℃, and to about 150 ℃, more preferably to about 95 ℃, still more preferably to about 90 ℃, even more preferably to about 85 ℃.

In the present invention, the aqueous phase has a temperature below the melting point of the high melting point fatty compound. When mixed with the aqueous phase, the oil phase preferably has a temperature of from about 10 ℃, more preferably from about 15 ℃, still more preferably from about 20 ℃, and to about 65 ℃, more preferably to about 55 ℃, still more preferably to about 52 ℃, even more preferably to about 48 ℃. When mixed with an oil phase, the temperature of the aqueous phase is preferably at least about 5 ℃ lower, more preferably at least about 10 ℃ lower, than the temperature of the oil phase. When mixed with an oil phase, the temperature of the water phase is preferably from about 2 ℃ to about 60 ℃, more preferably from about 2 ℃ to about 40 ℃, and still more preferably from about 2 ℃ to about 30 ℃ below the melting point of the high melting point fatty compound.

In the present invention, the temperature of the emulsion, when formed, is from about 10 ℃ to about 40 ℃, even more preferably from about 20 ℃ to about 37 ℃, in terms of improved rheological consistency and/or stability of the emulsion structure. Preferably, especially in forming the gel matrix, the temperature of the emulsion, when formed, is from about 2 ℃ to about 60 ℃, more preferably from about 2 ℃ to about 40 ℃, and still more preferably from about 2 ℃ to about 30 ℃ below the melting point of the high melting point fatty compound.

Details of oil phase composition

The oil phase comprises a surfactant and a high melting point fatty compound. To provide the benefits of the present invention, the oil phase preferably comprises from about 50% to about 100%, more preferably from about 60% to about 100%, and still more preferably from about 70% to about 100%, by weight of the total amount of surfactant and high melting point fatty compound used in the personal care composition, of surfactant and high melting point fatty compound.

To provide the benefits of the present invention, the surfactant and high melting point fatty compound are present in the oil phase, with or without other ingredients, preferably at a level of from about 35% to about 100%, more preferably from about 50% to about 100%, and still more preferably from about 60% to about 100%, by weight of the oil phase.

The oil phase may comprise an aqueous carrier, such as water and a lower alkyl alcohol and a polyol. If included, the aqueous carrier content in the oil phase is up to about 50%, more preferably up to about 40%, still more preferably up to about 25%, even more preferably up to about 15%, by weight of the oil phase, in order to provide the benefits of the present invention. In the aqueous carrier, the water content of the oil phase is also preferably controlled such that the water content of the oil phase is preferably at most about 40%, more preferably at most about 25%, still more preferably at most about 15%, even more preferably at most about 10%, by weight of the oil phase. The oil phase may be substantially free of water. In the present invention, "the oil phase is substantially free of water" means: the oil phase contains no water; the oil phase does not contain water that is not an impurity in the ingredients; alternatively, if the oil phase comprises water, the content of such water is very low. In the present invention, the total content of such water in the oil phase, if included, is preferably 1% or less, more preferably 0.5% or less, still more preferably 0.1% or less, by weight of the oil phase.

The oil phase may contain other ingredients in addition to the surfactant and high melting point fatty compound, as well as an aqueous carrier. Such other ingredients are, for example, water-insoluble components and/or heat-sensitive components, such as water-insoluble silicones, water-insoluble fragrances, water-insoluble preservatives such as parabens, and non-heat-sensitive preservatives such as benzyl alcohol. In the present invention, "water-insoluble component" means that the component has an aqueous solubility at 25 ℃ of less than 1g/100g of water (excluding 1g/100g of water), preferably 0.7g/100g of water or less, more preferably 0.5g/100g of water or less, still more preferably 0.3g/100g of water or less. If included, it is preferred that such other ingredients in the oil phase be up to about 50%, more preferably up to about 40%, by weight of the oil phase, in accordance with providing the beneficial effects of the present invention.

Details of the aqueous phase composition

The aqueous phase comprises an aqueous carrier. In order to provide the benefits of the present invention, the aqueous phase preferably comprises from about 50% to about 100%, more preferably from about 70% to about 100%, still more preferably from about 90% to about 100%, even more preferably from about 95% to about 100%, by weight of the total amount of aqueous carrier used in the personal care composition, of aqueous carrier.

To provide the benefits of the present invention, the aqueous carrier is present in the aqueous phase, with or without other ingredients, in an amount of from about 50% to about 100%, more preferably from about 70% to about 100%, still more preferably from about 90% to about 100%, even more preferably from about 95% to about 100%, by weight of the aqueous phase.

The aqueous phase may comprise a surfactant and a high melting point fatty compound. If included, the surfactant and high melting point fatty compound in the aqueous phase are present in an amount up to about 20%, more preferably up to about 10%, and still more preferably up to about 7% by weight of the aqueous phase, in order to provide the benefits of the present invention. Even more preferably, the aqueous phase is substantially free of surfactants and high melting point fatty compounds. In the present invention, "the aqueous phase is substantially free of surfactant and high melting point fatty compound" means: the water phase does not contain a surfactant and a high melting point fatty compound; or if the aqueous phase contains surfactants and high melting point fatty compounds, the level of such surfactants and high melting point fatty compounds is very low. In the present invention, the total content of such surfactants and high melting point fatty compounds in the aqueous phase, if included, is preferably 1% or less, more preferably 0.5% or less, and still more preferably 0.1% or less by weight of the aqueous phase.

The aqueous phase may contain other ingredients in addition to the surfactant and the high melting point fatty compound, as well as an aqueous carrier. Such other ingredients are, for example, water-soluble components and/or heat-sensitive components, such as water-soluble pH regulators, water-soluble preservatives such as phenoxyethanol andand a water-soluble polymer. In the present invention, "water-soluble component" means that the component has a solubility in water of at least 1g/100g of water, preferably at least 1.2g/100g of water, more preferably at least 1.5g/100g of water, still more preferably at least 2.0g/100 g of water at 25 ℃. If included, it is preferred that such other ingredients in the aqueous phase be up to about 20%, more preferably up to about 20%, by weight of the aqueous phase, in accordance with providing the beneficial effects of the present inventionAbout 10% more.

Personal care compositions

The personal care compositions of the present invention comprise a surfactant, a high melting point fatty compound, and an aqueous carrier. The surfactant, high melting point fatty compound, and aqueous carrier are in the form of an emulsion.

Cationic surfactant system

The compositions of the present invention comprise a cationic surfactant system. The cationic surfactant system may be present in the composition at a level of from about 0.5%, preferably from about 1%, more preferably from about 1.5%, still more preferably from about 1.8%, still more preferably from about 2.0%, and to about 8%, preferably to about 5%, more preferably to about 4%, by weight of the composition, in accordance with providing the benefits of the present invention.

In the present invention, the surfactant is preferably water-insoluble. In the present invention, "water-insoluble surfactant" means that the surfactant has a solubility in water at 25 ℃ of less than 1g/100g of water (excluding 1g/100g of water), preferably 0.7g/100g of water or less, more preferably 0.5g/100g of water or less, still more preferably 0.3g/100g of water or less.

The cationic surfactant system useful herein comprises a mono-alkyl quaternary ammonium salt cationic surfactant and a dialkyl cationic surfactant. It is believed that the combination of such mono-alkyl quaternary ammonium salt cationic surfactants and di-alkyl cationic surfactants provides a sensation of quick rinsing and/or a sensation of easy spreading through hair, compared to the use of mono-alkyl cationic surfactants having one long alkyl chain having 12 to 30 carbon atoms alone. In cationic surfactant systems, the weight ratio of monoalkyl quat cationic surfactant to dialkyl cationic surfactant is preferably from about 1:1 to about 10:1, more preferably from about 1.5:1 to about 7:1, and still more preferably from about 2:1 to about 5:1, in terms of rheological stability and conditioning benefits.

Monoalkyl quaternary ammonium salt cationic surfactant

The mono alkyl quaternary ammonium salt cationic surfactants useful herein are those having one long alkyl chain, preferably having from 12 to 30 carbon atoms, more preferably from 16 to 24 carbon atoms, still more preferably from 18 to 22 carbon atoms, in terms of conditioning benefit. Such mono-alkyl quaternary ammonium salt cationic surfactants useful herein are, for example, those having the formula (I):

wherein R is⁷¹、R⁷²、R⁷³And R⁷⁴One of which is selected from an aliphatic group having from 12 to 30 carbon atoms, more preferably from 16 to 24 carbon atoms, and still more preferably from 18 to 22 carbon atoms, or an aromatic group, alkoxy group, polyoxyalkylene group, alkylamido group, hydroxyalkyl group, aryl group, or alkylaryl group having up to about 30 carbon atoms; r⁷¹、R⁷²、R⁷³And R⁷⁴The remainder of which are independently selected from aliphatic groups having from 1 to about 8 carbon atoms, preferably from 1 to 3 carbon atoms, or aromatic, alkoxy, polyoxyalkylene, alkylamido, hydroxyalkyl, aryl or alkylaryl groups having up to about 8 carbon atoms; and X-is a salt-forming anion selected from the group consisting of halide, such as chloride and bromide, C1-C4 alkylsulfate, such as methylsulfate and ethylsulfate, and mixtures thereof. In addition to carbon and hydrogen atoms, aliphatic groups may also contain ether linkages and other groups such as amino groups. Longer chain aliphatic groups (e.g., those having about 16 carbon atoms or more) can be saturated or unsaturated. Preferably, R⁷¹、R⁷²、R⁷³And R⁷⁴One is selected from alkyl groups of 12 to 30 carbon atoms, more preferably 16 to 24 carbon atoms, still more preferably 18 to 22 carbon atoms; and R is⁷¹、R⁷²、R⁷³And R⁷⁴The rest of (A) are independently selected from CH₃、C₂H₅、C₂H₄OH、CH₂C₆H₅And mixtures thereof.

Among the more preferred cationic surfactants are those having longer alkyl groups, i.e., C18-22 alkyl groups. Such cationic surfactants include, for example, behenyltrimethylammonium chloride, behenyltrimethylammonium methylsulfate or behenyltrimethylammonium ethylsulfate, and also stearyl trimethylammonium chloride, stearyl trimethylammonium methylsulfate or stearyl trimethylammonium ethylsulfate.

Dialkyl cationic surfactant

The dialkyl cationic surfactants useful herein are those having two long alkyl chains having from 12 to 30 carbon atoms, more preferably from 16 to 24 carbon atoms, still more preferably from 18 to 22 carbon atoms, including, for example, di-long alkyl quaternary ammonium salts. Such dialkyl quaternary ammonium salts useful herein are those having the formula (I):

wherein R is⁷¹、R⁷²、R⁷³And R⁷⁴Two of which are selected from aliphatic groups having from 12 to 30 carbon atoms, preferably from 16 to 24 carbon atoms, more preferably from 18 to 22 carbon atoms, or aromatic, alkoxy, polyoxyalkylene, alkylamido, hydroxyalkyl, aryl or alkylaryl groups having up to about 30 carbon atoms; r⁷¹、R⁷²、R⁷³And R⁷⁴The remainder of which are independently selected from aliphatic groups having from 1 to about 8 carbon atoms, preferably from 1 to 3 carbon atoms, or aromatic groups, alkoxy groups, polyoxyalkylene groups, alkylamido groups, hydroxyalkyl groups, aryl groups having up to about 8 carbon atomsA group or an alkylaryl group; and X-is a salt-forming anion selected from the group consisting of halide, such as chloride and bromide, C1-C4 alkylsulfate, such as methylsulfate and ethylsulfate, and mixtures thereof. In addition to carbon and hydrogen atoms, aliphatic groups may also contain ether linkages and other groups such as amino groups. Longer chain aliphatic groups (e.g., those having about 16 carbon atoms or more) can be saturated or unsaturated. Preferably, R⁷¹、R⁷²、R⁷³And R⁷⁴Two of which are selected from alkyl groups having from 12 to 30 carbon atoms, preferably from 16 to 24 carbon atoms, more preferably from 18 to 22 carbon atoms; and R is⁷¹、R⁷²、R⁷³And R⁷⁴The rest of (A) are independently selected from CH₃、C₂H₅、C₂H₄OH、CH₂C₆H₅And mixtures thereof.

Such preferred dialkyl cationic surfactants include, for example, dialkyl (14-18) dimethyl ammonium chloride, ditalloalkyl dimethyl ammonium chloride, dihydrogenated tallow alkyl dimethyl ammonium chloride, distearyl dimethyl ammonium chloride, and dihexadecyl dimethyl ammonium chloride.

High melting point aliphatic compounds

To provide the benefits of the present invention, the high melting point fatty compound may be present in the composition at a level of from about 0.5%, preferably from about 1.0%, more preferably from about 1.5%, still more preferably from about 2%, even more preferably from about 4%, and to about 15%, preferably to about 10%, by weight of the composition.

For stability of the emulsion, especially the gel matrix, the high melting point fatty compounds useful herein have a melting point of 25 ℃ or higher, preferably 40 ℃ or higher, more preferably 45 ℃ or higher, and still more preferably 50 ℃ or higher. For easier manufacture and easier emulsification, such melting points are preferably up to about 90 ℃, more preferably up to about 80 ℃, still more preferably up to about 70 ℃, even more preferably up to about 65 ℃. In the present invention, the high melting point fatty compound may be used as a single compound or as a blend or mixture of at least two high melting point fatty compounds. When used in such blends or mixtures, the above melting point represents the melting point of the blend or mixture.

The high melting point fatty compounds useful herein are selected from the group consisting of fatty alcohols, fatty acids, fatty alcohol derivatives, fatty acid derivatives, and mixtures thereof. It will be appreciated by those skilled in the art that the compounds disclosed in this section of the specification may in some cases belong to more than one class, for example, some fatty alcohol derivatives may also be classified as fatty acid derivatives. However, the given categories are not intended to be limiting to the specific compounds, and are done for ease of classification and nomenclature. Furthermore, it is understood by those skilled in the art that depending on the number and position of double bonds and the length and position of branching, certain compounds having certain required carbon atoms may have a melting point below the preferred melting point hereinabove in the present invention. Such low melting compounds are not intended to be included in this section. Non-limiting examples of high melting point compounds are found in the "International Cosmetic Ingredient Dictionary" fifth edition (1993) and the "CTFA Cosmetic Ingredient Handbook" second edition (1992).

Among the various high melting point fatty compounds, fatty alcohols are preferred for use in the compositions of the present invention. Fatty alcohols useful herein are those having from about 14 to about 30 carbon atoms, preferably from about 16 to about 22 carbon atoms. These fatty alcohols are saturated and may be straight chain alcohols or branched chain alcohols.

Preferred fatty alcohols include, for example, cetyl alcohol (having a melting point of about 56℃.), stearyl alcohol (having a melting point of about 58-59℃.), behenyl alcohol (having a melting point of about 71℃.), and mixtures thereof. These compounds are known to have the above melting points. However, when provided, they often have lower melting points because such products are often provided as mixtures of fatty alcohols having an alkyl chain length distribution in which the alkyl backbone is cetyl, stearyl, or behenyl groups in the present invention, with cetyl, stearyl, and mixtures thereof being more preferred fatty alcohols.

Commercially available high melting point fatty compounds useful herein include: cetyl alcohol, stearyl alcohol, and behenyl alcohol having a trade name KONOL series available from ShinNihon Rika (Osaka, Japan) and a trade name NAA series available from NOF (Tokyo, Japan); pure behenyl alcohol with the trade name 1-DOCOSANOL available from WAKO (Osaka, Japan).

Gel matrix

In the present invention, the emulsion is preferably in the form of a gel matrix. The gel matrix comprises a cationic surfactant system, a high melting point fatty compound, and an aqueous carrier. The gel matrix is suitable for providing a variety of conditioning benefits, such as providing a slippery feel during application to wet hair, and providing softness and moisturized feel on dry hair.

Preferably, particularly when forming a gel matrix, the total amount of cationic surfactant and high melting point fatty compound is from about 1.0%, preferably from about 2.0%, more preferably from about 3.0%, by weight of the composition, and from about 15%, preferably to about 14%, more preferably to about 13%, and still more preferably to about 10%, by weight of the composition, in terms of diffusibility and product appearance, in terms of providing the benefits of the present invention. Further, when forming the gel matrix, the cationic surfactant and the high melting point fatty compound are present in an amount such that the weight ratio of cationic surfactant to high melting point fatty compound is in the range of preferably from about 1:1 to about 1:10, more preferably from about 1:1 to about 1:4, and still more preferably from about 1:2 to about 1:4, in accordance with providing improved wet conditioning benefits.

When forming a gel matrix, the compositions of the present invention are preferably substantially free of anionic surfactants and anionic polymers for stability of the gel matrix. In the present invention, "the composition is substantially free of anionic surfactant and anionic polymer" means that: the composition is free of anionic surfactants and anionic polymers; or if the composition comprises anionic surfactant and anionic polymer, the level of such anionic surfactant and anionic polymer is very low. In the present invention, the total level of such anionic surfactant and anionic polymer, if included, is preferably 1% or less, more preferably 0.5% or less, still more preferably 0.1% or less by weight of the composition. Most preferably, the total level of such anionic surfactant and anionic polymer is 0% by weight of the composition.

Aqueous carrier

The compositions of the present invention comprise an aqueous carrier. The amount and type of carrier is selected based on compatibility with other components and other properties desired for the product.

Carriers useful in the present invention include water and aqueous solutions of lower alkyl alcohols and polyols. Lower alkyl alcohols useful herein are monohydric alcohols having from 1 to 6 carbon atoms, more preferably ethanol and isopropanol. Polyols for use herein include propylene glycol (propylene glycol), hexylene glycol, glycerol and propylene glycol (propane diol).

Preferably, the aqueous carrier is substantially water. Deionized water is preferably used. Water from natural sources containing mineral cations may also be used, depending on the desired properties of the product. Generally, the compositions of the present invention comprise from about 20% to about 99%, preferably from about 30% to about 95%, and more preferably from about 80% to about 90% water.

Siloxane compound

Preferably, the composition of the present invention preferably comprises a silicone compound. It is believed that the silicone compound provides smoothness and softness on dry hair. The silicone compounds herein are preferably used in an amount of from about 0.1% to about 20%, more preferably from about 0.5% to about 10%, and still more preferably from about 1% to about 8%, by weight of the composition.

Preferably, in the composition, the silicone compound has an average particle size of from about 1 micron to about 50 microns.

Herein, the silicone compound that can be used as a single compound, as a blend or mixture of at least two silicone compounds, or as a blend or mixture of at least one silicone compound and at least one solvent preferably has a viscosity of about 1,000 to about 2,000,000 mPa-s at 25 ℃.

The viscosity can be measured by means of a glass capillary viscometer as shown in Dow Corning corporation Test Method CTM0004, 20.7.1970. Suitable silicone fluids include polyalkylsiloxanes, polyarylsiloxanes, polyalkylarylsiloxanes, polyether siloxane copolymers, amino-substituted siloxanes, quaternized siloxanes, and mixtures thereof. Other nonvolatile silicone compounds having conditioning properties may also be used.

Preferred polyalkylsiloxanes include, for example, polydimethylsiloxane, polydiethylsiloxane, and polymethylphenylsiloxane. Polydimethylsiloxane (which is also referred to as dimethylsiloxane) is particularly preferred. For example, these siloxane compounds may be theirAnd TSF451 series from General Electric Company, and from Dow Corning as their Dow Corning SH200 series.

For example, the polyalkylsiloxanes above are commercially available as mixtures with siloxane compounds having lower viscosities. Such mixtures preferably have a viscosity of from about 1,000 to about 100,000 mPas, more preferably from about 5,000 to about 50,000 mPas. Such mixtures preferably comprise: (i) a first siloxane having a viscosity of from about 100,000 to about 30,000,000mPa s, preferably from about 100,000 to about 20,000,000mPa s, at 25 ℃; and (ii) a second siloxane having a viscosity of from about 5 to about 10,000mPa s, preferably from about 5 to about 5,000mPa s, at 25 ℃. Such mixtures useful herein include, for example, a blend of a dimethylsiloxane having a viscosity of 18,000,000 mPa-s and a dimethylsiloxane having a viscosity of 200 mPa-s available from GE Toshiba, and a blend of a dimethylsiloxane having a viscosity of 18,000,000 mPa-s and a cyclopentasiloxane available from GE Toshiba.

The silicone compounds useful herein also include silicone gums. As used herein, the term "silicone gum" refers to a polyorganosiloxane material having a viscosity of greater than or equal to 1,000,000 centistokes at 25 ℃. It is recognized that the silicone gums described herein may also have some overlap with the silicone compounds disclosed above. The overlap is not intended to be limiting for any of these materials. The "silicone gum" will generally have a weight average molecular weight in excess of about 200,000, generally between about 200,000 and about 1,000,000. Specific examples include polydimethylsiloxane, poly (dimethylsiloxane methylvinylsiloxane) copolymers, poly (dimethylsiloxane diphenylsiloxane methylvinylsiloxane) copolymers, and mixtures thereof. For example, the silicone gums may be purchased as mixtures of silicone compounds having lower viscosities. Such mixtures useful herein include, for example, rubber Gum/Cyclomethicone blends available from Shin-Etsu.

Siloxane compounds useful herein also include amino substituted materials. Preferred aminosiloxanes include, for example, those corresponding to the general formula (I):

(R₁)_aG_3-a-Si-(-OSiG₂)_n-(-OSiG_b(R₁)_2-b)_m-O-SiG_3-a(R₁)_a

wherein G is hydrogen, phenyl, hydroxy, or C₁-C₈Alkyl, preferably methyl; a is 0 or an integer having a value of 1 to 3, preferably 1; b is 0, 1 or 2, preferably 1; n is a number from 0 to 1,999; m is an integer of 0 to 1,999; the sum of n and m is a number from 1 to 2,000; a and m are not equal to 0; r₁To conform to the formula CqH2_qMonovalent radical of LWherein q is an integer having a value of 2 to 8, and L is selected from the group consisting of: -N (R)₂)CH₂-CH₂-N(R₂)₂；-N(R₂)₂；-N(R₂)₃A^-；-N(R₂)CH₂-CH₂-NR₂H₂A^-(ii) a Wherein R is₂Is hydrogen, phenyl, benzyl, or a saturated hydrocarbon group, preferably about C₁To about C₂₀An alkyl group of (a); a. the^-Is a halide ion.

Highly preferred aminosilicones are those corresponding to formula (I) wherein m =0, a =1, q =3, G = methyl, n is preferably from about 1500 to about 1700, more preferably about 1600; and L is-N (CH)₃)₂or-NH₂More preferably-NH₂. Another highly preferred aminosilicone is that corresponding to formula (I) wherein m =0, a =1, q =3, G = methyl, n is preferably from about 400 to about 600, more preferably about 500; and L is-N (CH)₃)₂or-NH₂More preferably-NH₂. Such highly preferred aminosiloxanes may be referred to as blocked aminosiloxanes, since one or both ends of the siloxane chain are blocked by a nitrogen-containing group.

When the above aminosilicone is incorporated into the composition, the aminosilicone may be mixed with a solvent having a lower viscosity. Such solvents include, for example, polar or non-polar, volatile or non-volatile oils. Such oils include, for example, silicone oils, hydrocarbons, and esters. Among such solvents, preferred are those selected from the group consisting of: non-polar volatile hydrocarbons, volatile cyclic siloxanes, non-volatile linear siloxanes, and mixtures thereof. Non-volatile linear silicones useful herein are those having a viscosity of from about 1 to about 20,000 centistokes, preferably from about 20 to about 10,000 centistokes, at 25 ℃. In preferred solvents, non-polar, volatile hydrocarbons, especially non-polar, volatile isoparaffins, are highly preferred in terms of reducing the viscosity of the aminosilicone and providing improved hair conditioning benefits such as reduced friction of dry hair. Such mixtures preferably have a viscosity of from about 1,000 to about 100,000 mPas, more preferably from about 5,000 to about 50,000 mPas.

Other suitable alkylamino substituted silicone compounds include those having an alkylamino substituent as a pendant group on the silicone backbone. Highly preferred are those known as "amino-terminated dimethylsiloxanes". Commercially available amino-terminated dimethyl siloxanes useful herein include, for example, BY16-872 available from Dow Corning.

The silicone compounds may be further incorporated into the present invention in the form of an emulsion, wherein the emulsion is made by mechanical mixing, or by emulsion polymerization in the synthesis stage, with or without the aid of a surfactant selected from the group consisting of anionic surfactants, nonionic surfactants, cationic surfactants, and mixtures thereof.

Additional Components

The compositions of the present invention may contain other additional components which may be selected by those skilled in the art depending on the desired characteristics of the final product and which are suitable for rendering the compositions more aesthetically or aesthetically acceptable, or to provide them with additional use benefits. Such other additional components are typically used alone at levels of from about 0.001% to about 10%, preferably up to about 5%, by weight of the composition.

A wide variety of other additional components may be formulated into the compositions of the present invention. These include: other conditioning agents, such as hydrolyzed collagen from Hormel under the trade name Peptein2000, vitamin E from Eisai under the trade name Emix-d, panthenol from Roche, panthenyl ethyl ether from Roche, hydrolyzed keratin, proteins, plant extracts, and nutrients; preservatives, such as benzyl alcohol, methyl paraben, propyl paraben and imidazolidinyl urea; pH adjusters such as citric acid, sodium citrate, succinic acid, phosphoric acid, sodium hydroxide, sodium carbonate; colorants such as any of FD & C or D & C dyes; a fragrance; and sequestering agents, such as disodium edetate; ultraviolet and infrared screening and absorbing agents, such as benzophenone; and anti-dandruff agents such as zinc pyrithione.

Product form

The compositions of the present invention may be in the form of rinse-off products or leave-on products, and may be formulated in a variety of product forms, including but not limited to creams, gels, emulsions, mousses, and sprays. The compositions of the present invention are particularly suitable for use in hair conditioners, especially rinse-off hair conditioners.

Application method

The composition of the present invention is preferably used in a method of conditioning hair comprising the steps of:

(i) after shampooing, applying an effective amount of the conditioning composition to the hair to condition the hair;

and

(ii) the hair is then rinsed.

Herein, an effective amount is, for example, from about 0.1mL to about 2mL per 10g of hair, preferably from about 0.2mL to about 1.5mL per 10g of hair.

The compositions of the present invention provide improved conditioning benefits, especially improved wet conditioning benefits after rinsing and improved dry conditioning while maintaining wet conditioning benefits prior to rinsing. The compositions of the present invention may also provide improved product appearance to the consumer. Thus, reduced dosages of the present compositions can provide the same degree of conditioning benefits as those of full dose conventional conditioner compositions. Such reduced doses herein are, for example, from about 0.3mL to about 0.7mL per 10g of hair.

Examples of the invention

The following examples further describe and demonstrate embodiments within the scope of the present invention. These examples are given solely for the purpose of illustration and are not to be construed as limitations of the present invention, as many variations thereof are possible without departing from the spirit and scope of the invention. Where applicable, the components are identified by chemical or CTFA name, unless otherwise defined below.

Composition (weight%)

Component definition

1 moderate to 100% propylene glycol and 67-69% dicetyl dimethyl ammonium chloride in 5% water available from Evonik Goldschmidt Corporation

2 aminosiloxane: commercially available from GE, has a viscosity of 10,000 mPas and has the following formula (I):

(R₁)_aG_3-a-Si-(-OSiG₂)_n-(-OSiG_b(R₁)_2-b)_m-O-SiG_3-a(R₁)_a (I)

wherein G is methyl; a is an integer of 1; b is 0, 1 or 2, preferably 1; n is 400 to

A number of about 600; m is an integer of 0; r₁To conform to the formula CqH2_qMonovalent radical of L, which

Wherein q is an integer of 3 and L is-NH₂

Preparation method

As indicated above, the above hair conditioning compositions of "example 1" to "example 3" and "example I" to "example iii" were prepared by one of the following methods I or II.

Method I

Components 1-7 are mixed and heated to about 66 ℃ to about 85 ℃ to form an oil phase. Components 8-10 were mixed separately and heated to about 20 ℃ to about 48 ℃ to form an aqueous phase. In thatIn a direct injection rotor-stator homogenizer, the oil phase is injected and takes 0.2 seconds or less to reach a 1.0 x 10 phase with the aqueous phase already present therein⁵J/m³To 1.0X 10⁷J/m³High shear field of energy density. Wherein the gel matrix, when formed, has a temperature of about 20 ℃ to about 37 ℃. Forming a gel matrix. If included, components 11-14 are added to the gel matrix with stirring. The composition was then allowed to cool to room temperature.

Method II

Components 1-7 are mixed and heated to about 66 ℃ to about 85 ℃ to form an oil phase. Components 8-10 were mixed separately and heated to about 20 ℃ to about 48 ℃ to form an aqueous phase. In thatIn a direct injection rotor-stator homogenizer, the oil phase is injected and takes 0.2 seconds or less to reach a 1.0 x 10 phase with the aqueous phase already present therein⁵J/m³To 1.0X 10⁷J/m³High shear field of energy density. Wherein the temperature of the gel matrix, when formed, is about 44 ℃. Forming a gel matrix. If included, components 11-14 are added to the gel matrix with stirring. The composition was then allowed to cool to room temperature.

Method III

Components 1-10 were mixed with stirring and heated to about 80 ℃. The mixture was cooled to about 55 ℃ and a gel matrix was formed. If included, components 11-14 are added to the gel matrix with stirring. The mixture was then allowed to cool to room temperature.

Performance and Conditioning benefits

For some of the above compositions, performance and conditioning benefits were assessed by the following methods. The results of the evaluation are also shown above.

The embodiments disclosed and represented by "example 1" to "example 3" are hair conditioning compositions made by the method of the present invention that are particularly useful for rinse-off applications. Such embodiments have many advantages. For example, they are efficiently converted into emulsions and provide wet conditioning benefits.

Such advantages can be understood by comparison between examples of the present invention and comparative examples ("examples i" to "example iii"). For example, less syneresis was observed in "example 1" of the present invention as compared to comparative example "example iii" made by a different process. Example 1 "of the present invention is believed to have improved stability of the emulsion structure compared to the comparative example" example iii "prepared by a different method. In addition, an improved sticky feel was observed in inventive example 1 "as compared to comparative example" example iii ".

As another example, a comparison between "example 1" and "example 3" of the present invention and comparative example "example i" shows the improved rheological consistency of "example 1" and "example 3" made by the process of the present invention compared to comparative example "example i" made by a higher emulsification temperature.

Furthermore, the "example 1" of the present invention, which is substantially free of water in the oil phase, shows better wet and/or dry conditioning benefits as compared to the comparative "example ii" which contains 7% water in the oil phase.

Syneresis

Syneresis was evaluated by assessing the amount of water on the surface of the composition after storage at 5 ℃ for 2 months by eye examination. The improved stability of the emulsion structure results in less water being squeezed out of the composition.

O: no noticeable water was observed on the conditioner surface

C: control (some water appears on the surface)

C1: perception equivalent to control

x: perception provides low wet conditioning benefits compared to controls.

The sticky feeling of the composition

The sticky feel was evaluated by panelists by touching the hair samples after application of 10mL of the composition.

O: it is believed to provide an improved sticky feel compared to the control.

C: control substance

C1: perception equivalent to control

x: it is believed to provide a poor viscous feel compared to the control.

Rheological consistency

Rheological consistency is evaluated by repeating the rheological property differences (the% rheological difference between the minimum and maximum rheology) for the same composition. Compositions with lower% difference are believed to have better consistency than those with higher% difference.

The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Rather, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as "40 mm" is intended to mean "about 40 mm".

Each document cited herein, including any cross-referenced or related patent or patent application, is hereby incorporated by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it teaches, suggests or discloses any such invention either alone or in any combination with any other reference or references. In addition, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.

While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims

1. A method of making a personal care composition,

wherein the composition comprises: a cationic surfactant system; high melting point aliphatics

An agent; and a carrier which contains water, wherein the carrier contains water,

wherein the cationic surfactant system comprises a mono alkyl quaternary ammonium salt cationic surfactant

And a dialkyl cationic surfactant; and is

Wherein the method comprises the steps of:

(1) preparing an oil phase comprising the surfactant and the high melting point fatty compound, wherein the temperature of the oil phase is above the melting point of the high melting point fatty compound; and

(2) preparing an aqueous phase comprising the aqueous carrier, wherein the temperature of the aqueous phase is below the melting point of the high melting point fatty compounds; and

(3) mixing the oil phase and the aqueous phase to form an emulsion;

wherein the mixing step (3) comprises the following detailed steps:

(3-2) feeding the other phase directly to the field; and

(3-3) forming an emulsion;

wherein the mixing step (3) is performed by using a homogenizer having a rotating member;

wherein the oil phase comprises from 0 to about 50%, by weight of the oil phase, of the aqueous carrier;

and is

2. The method of claim 1, wherein the mixing step (3) comprises the detailed steps of:

(3-1) feeding the aqueous phase to have a pH of about 1.0X 10²J/m³Or higher energy density high shear fields;

(3-2) feeding the oil phase directly into the field; and

(3-3) forming an emulsion.

3. The method of claim 1, wherein the high shear field has a magnitude of about 1.0 x 10³J/m³The energy density of (1).

4. The method of claim 1, the two phases reaching the high shear field within 0.52 seconds or less of the first encounter.

5. The method of claim 1, wherein the homogenizer having a rotating member is a rotor-stator homogenizer.

6. The method of claim 1, wherein the water content in the oil phase is at most about 40% by weight of the oil phase.

7. The method of claim 1, wherein the water content in the oil phase is at most about 25% by weight of the oil phase.

8. The method of claim 1, wherein the emulsion is a gel matrix comprising a cationic surfactant, a high melting point fatty compound, and an aqueous carrier.

9. The method of claim 8, wherein the weight ratio of the cationic surfactant to the high melting point fatty compound is in the range of about 1:1 to about 1: 4.

10. A composition made according to the method of claim 1.