HK1163560A

HK1163560A - Method for preparing personal care composition comprising surfactant and high melting point fatty compound

Info

Publication number: HK1163560A
Application number: HK12104687.6A
Authority: HK
Inventors: Toshiyuki Okada; Junichi Yokogi; Jian-Zhong Yang
Original assignee: 宝洁公司
Priority date: 2008-12-09
Filing date: 2009-12-09
Publication date: 2012-09-14

Description

Method of making personal care compositions comprising surfactants and high melting point fatty compounds

Technical Field

The present invention relates to a process for preparing a personal care composition comprising the steps of: (1) preparing a hot oil phase comprising a surfactant and a high melting point fatty compound; (2) preparing a cold aqueous phase comprising an aqueous carrier; 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 an energy density of about 1.0X 10²J/m³Or higher high shear fields; (3-2) feeding the other phase directly to the field; and (3-3) forming an emulsion. The method further requires that the surfactant is a mono-alkyl cationic surfactant and the composition is substantially free of di-alkyl cationic surfactants.

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 carried out by various protocols, various temperatures and various homogenizers.

For example, unexamined Japanese patent application 2005-255627 discloses in examples 14 and 15 hair conditioner compositions prepared by the following steps: preparing phase a comprising behenyl trimethyl ammonium chloride, stearyl alcohol and cetyl alcohol at 80 ℃; preparing phase B comprising water at 50 to 55 ℃; phase a was mixed into phase B by a pipeline mixer (t.k. pipeline homomixer) and cooled to 30 to 35 ℃.

For example, WO 2004/054693 discloses in example 13 a hair conditioner prepared by the following steps: preparing an aqueous phase at 24 to 46 ℃; preparing an oil (emulsion) phase comprising water, distearyldimethylammonium chloride, cetyltrimethylammonium chloride and cetyl alcohol at 65 to 88 ℃; delivering the phases through a conduit ultimately leading to a blending tube, the blending tube beingThe antechamber section of (a); and homogenizing the blend.

However, there remains a need for methods of making hair conditioning compositions and other personal care compositions that effectively convert surfactants and fatty compounds into emulsions. There remains a need for such methods to provide personal care compositions with the following properties, for example, by such effective conversions: (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, thick and/or more concentrated product appearance, and a consumer can perceive a higher conditioning benefit from its appearance; (iii) a uniform product appearance suitable for commercial products; and/or (iv) rheology suitable for commercial products, and/or improved stability of such rheology.

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

Summary of The Invention

The present invention relates to a process for preparing a personal care composition,

wherein the composition comprises: a 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 an energy density of about 1.0X 10²J/m³Or higher high shear fields;

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

(3-3) forming an emulsion;

wherein the cationic surfactant is a mono-alkyl cationic surfactant and the composition is substantially free of di-alkyl cationic surfactants.

The process of the present invention effectively converts the surfactant and fatty compound into an emulsion.

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 includes 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.

Preparation method

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

wherein the composition comprises a 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:

(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;

and the method further requires that the surfactant is a mono-alkyl cationic surfactant and the composition is substantially free of di-alkyl cationic surfactants.

The method also preferably includes the step of adding additional ingredients (if included) such as silicone compounds, fragrances, preservatives, polymers to the emulsion. 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 the 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 emulsion by first meeting in a high shear field, i.e., the resulting composition contains a small amount of non-emulsifying surfactant/high melting point fatty compound compared to other processes whereby such phases first meet in a non-or low 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 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 order to improve the conversion to the emulsion. 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 an energy density of 1.0X 10²J/m³Or higher high shear fields;

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

(3-3) forming an emulsion.

In the present invention, especially in the case of using a homogenizer with a rotating member as described in detail below, in order to stably produce a composition with 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, it is preferred to carry out the mixing step (3) including the detailed steps (3-1) and (3-2) using a high shear homogenizer. High shear homogenizers useful herein include, for example: high shear homogenisers with rotating members, e.g.From A. Berents Gmbh&Co, which is a direct injection, rotor-stator homogenizer; and Lexa-30 from Indolalival/TetraPac, which is a direct injection, rotor-stator homogenizer; and high-pressure homogenizers, e.g.Available from Sonic Corporation as a high pressure ultrasonic welding homogenizer. These high shear homogenizers are preferred over other high shear homogenizers because the two phases will reach the high shear field quickly after first meeting. Such other homogenizers, when used as is, include, for example: a high pressure homogenizer, such as a Manton Gaulin type homogenizer available from APV Manton Corporation; microfluidizer, available from Microfluidics Corporation; and homogenizers with rotating members, such as t.k. tube homomixers, and DR-3 from IKA Corporation. Those other homogenizers may be modified to allow the two phases to reach the high shear field quickly after the first encounter. When used as is, such other homogenizers 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 one named t.k. tube homomixer, can also provide such an increased amount of crystals of the high melting point fatty compound.

In the present invention, high shear homogenizers with rotating members, especially direct injection, rotor-stator homogenizers are preferred over high pressure homogenizers, such asAvailable from Sonic Corporation. It is believed that such high shear homogenizers with rotating members: greater production operating flexibility is provided due to its two independent levers (flow and rotation speed), whereas the high-pressure homogenizer has only one lever (pressure determined according to the flow); and/or reduce the need for high pressure investment.

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 ℃, further 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 lower than the melting point of the high melting point aliphatic compound. When mixed with the aqueous phase, the oil phase preferably has a temperature of about 10 ℃, more preferably about 15 ℃, still more preferably 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 the 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 the 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 compounds.

In the present invention, the temperature of the emulsion, when formed, is preferably from about 10 ℃ to about 85 ℃, more preferably from about 25 ℃ to about 65 ℃. Particularly in forming the gel matrix, the temperature of the emulsion as formed 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.

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 comprises preferably 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.

In order 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 is present in the oil phase at a level of 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, it is also preferred to adjust the water content of the oil phase 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 contains water, the amount of this 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 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. If included, such other ingredients are preferably present in the oil phase at levels up to about 50%, more preferably up to about 40%, by weight of the oil phase, in order to provide the benefits 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 is preferably 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, preferably 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 are present in the aqueous phase in an additive amount of 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 surfactant and high melting point fatty compound in the aqueous 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 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 at 25 ℃ 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 preferablyAt least 2.0g/100 g of water is selected. If included, such other ingredients are preferably present in the aqueous phase at levels up to about 20%, more preferably up to about 10% by weight of the aqueous phase, in order to provide the benefits of the present invention.

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

The compositions of the present invention comprise a cationic surfactant. To provide the benefits of the present invention, the cationic surfactant is present in the composition at a level of from about 1%, preferably from about 1.5%, 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 the present invention, the surfactant is preferably water-insoluble. In the present invention, "water-insoluble surfactant" means a surfactant having 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.

Among cationic surfactants, monoalkyl cationic surfactants are used in the compositions of the present invention in order to provide the desired gel matrix and wet conditioning benefits. To provide balanced wet conditioning benefits, the mono-alkyl cationic surfactants are those having one alkyl chain with 12 to 22 carbon atoms, preferably 16 to 22 carbon atoms, more preferably C18-22 alkyl. The other groups attached to the nitrogen are independently selected from alkyl groups having from 1 to about 4 carbon atoms, or alkoxy, polyoxyalkylene, alkylamido, hydroxyalkyl, aryl or alkylaryl groups having up to about 4 carbon atoms. The above-mentioned monoalkyl cationic surfactants include, for example, monoalkyl quaternary ammonium salts and monoalkyl amines. Monoalkyl quats include, for example, those having a long chain of non-functionalized alkyl groups. Monoalkylamines include, for example, monoalkylamidoamines and salts thereof.

In the present invention, the composition is substantially free of di-alkyl cationic surfactants for improved wet conditioning benefits. It is also believed that when the composition comprises mono-alkyl cationic surfactant and is substantially free of di-alkyl cationic surfactant, more benefit is observed by employing the method of the present invention, especially improved conditioning benefit delivered by the same amount of active ingredient. Such dialkyl cationic surfactants herein are those having two long alkyl chains of 12 to 22 carbon atoms, including for example di-long alkyl quaternary ammonium salts. In the present invention, "the composition is substantially free of dialkyl cationic surfactants" means that: the composition is free of dialkyl cationic surfactants; or if the composition comprises dialkyl cationic surfactants, the level of such dialkyl cationic surfactants is very low. In the present invention, the total level of such di-alkyl cationic surfactants, 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. The total level of such di-alkyl cationic surfactants is most preferably 0% by weight of the composition.

Monoalkyl quaternary ammonium salt cationic surfactant

The monoalkyl quats useful herein are those having the following formula (I):

wherein R is⁷¹、R⁷²、R⁷³And R⁷⁴Is selected from the group consisting of 16 to 40An aliphatic group of carbon atoms or an aryl, alkoxy, polyoxyalkylene, alkylamido, hydroxyalkyl, aryl or alkylaryl group having up to about 40 carbon atoms; r⁷¹、R⁷²、R⁷³And R⁷⁴The remainder of which are independently selected from aliphatic groups having from 1 to about 8 carbon atoms, or aryl, 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 ions such as chloride and bromide, C1-C4 alkylsulfate radicals 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 such as those having about 16 carbon atoms or more may be saturated or unsaturated. R⁷¹、R⁷²、R⁷³And R⁷⁴One of them is preferably selected from alkyl groups having 16 to 40 carbon atoms, more preferably 18 to 26 carbon atoms, still more preferably 22 carbon atoms; and R is⁷¹、R⁷²、R⁷³And R⁷⁴The rest of (A) are independently selected from CH₃、C₂H₅、C₂H₄OH、CH₂C₆H₅And mixtures thereof. It is believed that these monolong alkyl quaternized ammonium salts can provide improved wet hair smoothness and smoothness compared to the longest alkyl quaternized ammonium salts. It is also believed that mono-long alkyl quaternized ammonium salts can provide improved dry hair hydrophobicity and smooth feel compared to amine or amine salt cationic surfactants.

Among the more preferred cationic surfactants are those having longer alkyl chains, i.e., C18-22 alkyl groups. Such cationic surfactants include, for example, behenyltrimethylammonium chloride, behenyltrimethylammonium methylsulfate or behenyltrimethylammonium ethylsulfate, and stearyl trimethylammonium chloride, stearyl trimethylammonium methylsulfate or stearyl trimethylammonium methylsulfate. Also preferred is behenyl trimethyl ammonium chloride, behenyl trimethyl methyl ammonium sulfate or behenyl trimethyl ethyl ammonium sulfate, and also preferred is behenyl trimethyl ammonium chloride. It is believed that: cationic surfactants having longer alkyl groups provide improved deposition on hair and thus can provide improved conditioning benefits, such as improved dry hair softness, as compared to cationic surfactants having shorter alkyl groups. It is also believed that such cationic surfactants may provide reduced irritation as compared to cationic surfactants having shorter alkyl groups.

Mono-alkyl amine cationic surfactant

Monoalkylamines are also suitable as cationic surfactants. Primary, secondary and tertiary fatty amines are useful. Particularly useful are tertiary amidoamines having an alkyl group of from about 12 to about 22 carbon atoms. Exemplary tertiary amido amines include: stearamidopropyl dimethylamine, stearamidopropyl diethylamine, stearamidoethyl dimethylamine, palmitamidopropyl diethylamine, palmitamidoethyl dimethylamine, behenamidopropyl diethylamine, behenamidoethyl dimethylamine, arachidopropyl diethylamine, arachidoethyl dimethylamine, diethylaminoethyl stearamide. Amines useful in the present invention are disclosed in U.S. Pat. No. 4,275,055 to Nachtigal et al. These amines may also be used in combination with acids such as l-glutamic acid, lactic acid, hydrochloric acid, malic acid, succinic acid, acetic acid, fumaric acid, tartaric acid, citric acid, l-glutamic acid hydrochloride, maleic acid, and mixtures thereof; more preferably l-glutamic acid, lactic acid, citric acid. The amines herein are preferably partially neutralized with any of these acids in a molar ratio of amine to acid of from about 1: 0.3 to about 1: 2, more preferably from about 1: 0.4 to about 1: 1.

High melting point aliphatic compounds

The high melting point fatty compound is present in the composition at a level of from about 2%, preferably from about 4%, more preferably from about 5%, still more preferably from about 5.5%, and to about 15%, preferably to about 10% by weight of the composition, with a view to providing the benefits of the present invention.

The high melting point fatty compounds useful herein have a melting point of 25 ℃ or greater, preferably 40 ℃ or greater, more preferably 45 ℃ or greater, and still more preferably 50 ℃ or greater, in order to stabilize the emulsion, particularly the gel matrix. From the viewpoint of easier preparation and easier emulsification, it is preferred that this melting point is at most about 90 ℃, more preferably at most about 80 ℃, still more preferably at most about 70 ℃, even more preferably at most about 65 ℃. In the present invention, the high melting point fatty compound may be used in the form of a single compound or in the form of a blend or mixture of at least two high melting point fatty compounds. When used in the form of such a blend or mixture, the above melting point refers to 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 certain fatty alcohol derivatives may also be classified as fatty acid derivatives. However, the given categories are not intended to be limiting with respect to particular compounds, but are for ease of classification and nomenclature. Furthermore, it will be understood by those skilled in the art that certain compounds having a desired certain carbon atom may have a melting point lower than the above preferred melting point in the present invention, depending on the number and position of double bonds and the length and position of the branches. Such low melting compounds are not intended to be included in this section. Non-limiting examples of high melting point compounds can be 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 (melting point about 56℃.), stearyl alcohol (melting point about 58 to 59℃.), behenyl alcohol (melting point about 71℃.), and mixtures thereof. These compositions are known to have the melting points described above. However, they typically have a lower melting point when provided because such products are typically provided as mixtures of fatty alcohols having an alkyl chain length distribution in which the alkyl backbone is cetyl, stearyl, or behenyl in the present invention, with the more preferred fatty alcohols being cetyl alcohol, stearyl alcohol, and mixtures thereof.

Commercially available high melting point fatty compounds that may be used in the present invention include: cetyl, stearyl and behenyl alcohols available under the trade name KONOL series from Shin Nihon Rika (Osaka, Japan) and NAA series from NOF (Tokyo, Japan); pure behenyl alcohol available from WAKO (Osaka, Japan) under the trade name 1-DOCOSANOL.

Gel matrix

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

Particularly in the case of gel matrix formation, the total amount of cationic surfactant and high melting point fatty compound is preferably from about 7.0%, preferably from about 7.5%, more preferably from about 8.0% by weight of the composition, and for spreadability and product appearance, is up to about 15%, preferably to about 14%, more preferably to about 13%, still more preferably to about 10% by weight of the composition, in order to provide the benefits of the present invention. Further, when forming the gel matrix, to provide improved wet conditioning benefits, the cationic surfactant and the high melting point fatty compound are included at levels such that the weight ratio of the cationic surfactant to the 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.

When forming a gel matrix, the compositions of the present invention are preferably substantially free of anionic surfactants and anionic polymers in order to stabilize 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 anionic surfactant and anionic polymer is very low. In the present invention, the total content 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 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 useful herein include propylene glycol, hexylene glycol, glycerin, and propylene glycol.

Preferably, the aqueous carrier is substantially water. Deionized water is preferably used. Water of natural origin containing mineral cations may also be used, depending on the desired properties of the product. The compositions of the present invention generally 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.

The silicone compounds useful in the present invention have a viscosity at 25 ℃ of preferably from about 1,000 to about 2,000,000 mPa-s, as individual compounds, 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.

The viscosity can be determined by using a glass capillary viscometer as described in the test method CTM0004 of Dow Corning, 20 d 7/1970. Suitable silicone fluids include polyalkyl siloxanes, polyaryl siloxanes, polyalkylaryl siloxanes, 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 (also known as dimethicone) is particularly preferred. For example, these siloxane compounds may be theirAnd TSF 451 series from GeneralElectroic Company, and is available from Dow Corning as their Dow Corning SH200 series.

For example, the above polyalkylsiloxanes are commercially available as mixtures with siloxane compounds having a relatively low viscosity. Such mixtures have a viscosity of preferably 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 10,000 mPas at 25 ℃, preferably from about 5 to about 5,000 mPas. Such mixtures useful herein include, for example, a blend of a polydimethylsiloxane having a viscosity of 18,000,000mPa · s from GE Toshiba with a polydimethylsiloxane having a viscosity of 200mPa · s, and a blend of a polydimethylsiloxane having a viscosity of 18,000,000mPa · s from GETOshiba with cyclopentasiloxane.

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

Siloxane compounds that may also be used in the present invention include amino-substituted materials. Preferred aminosiloxanes include, for example, those conforming to the structure of 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; and 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 general formula CqH_2qA monovalent group of L, wherein 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; wherein R is₂Is hydrogen, phenyl, benzyl, or a saturated hydrocarbon radical, preferably about C₁To about C₂₀Alkyl groups of (a); a-is a halide ion.

Highly preferred aminosiloxanes are those conforming to the structure of 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 aminosiloxane is those conforming to the structure of 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 aminosilicones may be referred to as blocked aminosilicones, since one or both ends of the siloxane chain are blocked by a nitrogen-containing group.

When the above aminosilicones are incorporated into the composition, the aminosilicones may be mixed with solvents having a relatively low 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 various 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 order to reduce the viscosity of the aminosilicones and provide improved hair conditioning benefits such as reduced friction of dry hair, non-polar volatile hydrocarbons, especially non-polar volatile isoparaffins, are highly preferred in preferred solvents. Such mixtures have a viscosity of preferably 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. Those known as "amino-terminated polydimethylsiloxanes" are highly preferred. Commercially available amino-terminated polydimethylsiloxanes that can be used in the present invention include, for example, BY16-872 available from Dow Corning.

The silicone compounds may be further incorporated into the compositions of the present invention in the form of an emulsion, wherein the emulsion is made by mechanical agitation, or by emulsion polymerization during 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 to make 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 Peptein 2000, 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 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 1-oxo-2-mercaptopyridine.

Low melting point oil

Low melting point oils useful in the present invention are those having a melting point of less than 25 ℃. The low melting point oils useful in the present invention are selected from the group consisting of: hydrocarbons having from 10 to about 40 carbon atoms; unsaturated fatty alcohols having from about 10 to about 30 carbon atoms, such as oleyl alcohol; unsaturated fatty acids having from about 10 to about 30 carbon atoms; a fatty acid derivative; a fatty alcohol derivative; ester oils such as pentaerythritol ester oils (including pentaerythritol tetraisostearate), trimethylol ester oils, citrate ester oils, and glyceride oils; poly-alpha-olefin oils, such as polydecene; and mixtures thereof.

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

Examples

The following examples further describe and illustrate 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. Unless otherwise indicated below, all ingredients herein are identified by chemical or CTFA name.

Composition 1 (% by weight)

Composition 2 (% by weight)

Composition 3 (% by weight)

Component definition

1 aminosiloxane: 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 a number from 400 to about 600; m is an integer of 0; r₁To conform to the general formula CqH_2qA monovalent group of the structure L, wherein q is an integer of 3 and L is-NH₂

267-69% dicetyldimethylammonium chloride in propylene glycol from Evonik Goldschmidt Corporation

Preparation method

Method I

The conditioning compositions in "example 1" to "example 3", "example 5" and "example v" were prepared as follows:

components 1 through 7, 11 and 16 were mixed and heated to about 66 ℃ to about 85 ℃ to form an oil phase. Components 9, 10 and 15 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 energy density at which the oil phase is injected and reaches where the aqueous phase already exists is 1.0X 10 with 0.2 seconds⁴J/m³To 1.0X 10⁷J/m³High shear field of (2). Forming a gel matrix. If included, components 8 and 12-14 are added to the gel matrix with stirring. The composition was then allowed to cool to room temperature.

Method II

The conditioning composition of example "4" was prepared as follows:

components 1 through 7 and 11 were mixed and heated to about 66 ℃ to about 85 ℃ to form an oil phase. Components 9, 10 and 15 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 an energy density of 1.0 x 10 where the aqueous phase is already present³J/m³To less than 1.0X 10⁴J/m³(excluding 1.0X 10⁴J/m³) In the high shear field of (3). Forming a gel matrix. If included, components 8 and 12-14 are added to the gel matrix with stirring. The composition was then allowed to cool to room temperature.

Method III

The conditioning composition in "example i" was prepared as follows:

components 1 through 7 and 11 were mixed and heated to about 66 ℃ to about 85 ℃ to form an oil phase. Components 9, 10 and 15 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 an energy density of 10J/m where the aqueous phase is already present³The shear field of (a). A homogeneous emulsion was not obtained. If included, components 8 and 12-14 are added thereto with stirring. The composition was then allowed to cool to room temperature. A homogeneous composition is not obtained.

Method IV

The conditioning composition in "example ii" was prepared as follows:

components 1 through 7 and 11 were mixed and heated to about 66 ℃ to about 85 ℃ to form an oil phase. Components 9, 10 and 15 were mixed separately and heated to about 20 ℃ to about 48 ℃ to form an aqueous phase. In the DR-3 homogenizer from IKAcorporation, the oil phase is injected and takes 0.6 seconds or more to reach an energy density of 1.0X 10 where the aqueous phase is already present³J/m³To less than 1.0X 10⁴J/m³(excluding 1.0X 10⁴J/m³) High shear field of (2). A homogeneous emulsion was not obtained. If included, components 8 and 12-14 are added thereto with stirring. The composition was then allowed to cool to room temperature. A homogeneous composition is not obtained.

Method V

The conditioning compositions of "example iii", "example iv" and "example vi" were prepared as follows:

components 1 to 7 and 16 were added to component 15 with stirring and heated to about 80 ℃. The mixture is cooled to about 55 ℃ and a gel matrix is formed. If included, components 8-14 are added to the gel matrix with stirring. The mixture was then allowed to cool to room temperature.

Property and Conditioning benefits

The embodiments disclosed and illustrated by the foregoing "examples 1" through "example 5" 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 can effectively deliver conditioning benefits to hair, i.e., improved conditioning benefits are obtained from the same amount of active ingredients, such as cationic surfactants and high melting point fatty compounds.

For the above compositions made by the process of the present invention and other compositions used for comparison, the conditioning benefits were assessed by the following method. The evaluation results are also shown in tables 1 to 3 below.

Wet Condition before rinsing

Wet conditioning before rinsing was assessed according to the friction of hair measured by an instrument called Texture Analyzer (TA XT Plus, Texture Technologies, Scarsdale, NY, USA). 1g of the composition was applied to a 10g hair sample. After spreading the composition on the hair sample and before rinsing it, the friction (g) between the hair sample and the polyurethane pad was determined by the above-described instrument.

A: the friction was reduced by more than 5% (excluding 5%) to 10% compared to the control.

B: the friction was reduced by up to 5% (including 5%) compared to the control.

C: control, or equivalent control

D: the friction was increased compared to the control.

Wet Conditioning after rinsing

The wet conditioning after rinsing was evaluated according to the hair friction force measured by an instrument called Texture analyzer (TA XT Plus, Texture Technologies, Scarsdale, NY, USA). 1g of the composition was applied to a 10g hair sample. After spreading the composition on the hair sample, it was rinsed with warm water for 30 seconds. The friction (g) between the hair sample and the polyurethane pad was then determined by the above instrument.

B: the friction was reduced by up to 5% (including 5%) compared to the control.

C: control, or equivalent control

D: the friction was increased compared to the control.

Dry conditioning property

Dry conditioning performance was assessed according to hair friction as measured by an instrument called an Instron tester (Instron 5542, Instron, Inc; Canton, Mass., USA). 2g of the composition was applied to a 20g sample of hair. After spreading the composition on the hair sample, it was rinsed with warm water for 30 seconds and then the hair sample was allowed to dry overnight. The friction (g) between the hair surface and the polyurethane pad was measured along the hair.

B: the friction was reduced by up to 5% (including 5%) compared to the control.

C: control, or equivalent control

D: the friction was increased compared to the control.

Product appearance

Upon dispensing 0.4mL of conditioner product from the package, the product appearance was assessed by 6 panelists.

A: the product had a thick product appearance according to the responses of 3 to 6 panelists, and was perceived as a positive impression from its appearance.

B: the product had a thick product appearance according to the responses of 1 to 2 panelists, and was perceived as a positive impression from its appearance.

C: control substance

Table 1 for composition 1

	Example 1	Example 2	Example 3	Example iii
					Wet Condition before rinsing	A	A	A	C
Wet Conditioning after rinsing	A	A	A	C
					Dry conditioningProperty of (2)	B	A	B	C
Product appearance	A	A	-	C

The composition of example iii was used as a control in table 1.

For example, a comparison between example 2 and example iii shows that the composition of example 2 made by the process of the present invention effectively delivers conditioning benefits to the hair compared to the composition of example iii having the same amount of cationic surfactant and high melting point fatty compound but made by a different process.

Furthermore, the compositions of examples 1 to 3, all made by the process of the present invention, provide improved conditioning benefits compared to the composition of example ii. Furthermore, the compositions of examples 1 and 2 also provide improved product appearance compared to the composition of example ii.

The conditioning benefits of the compositions of examples i and ii were not assessed because a homogeneous composition was not obtained from these examples. The composition of example i was made by process III, where the shear field had a lower energy density, and the composition of example ii was made by process IV, where the oil phase took longer to reach the high shear field.

Table 2 for composition 2

	Example 5	Example iv
			Wet Condition before rinsing	A	C
Wet Conditioning after rinsing	A	C
			Dry conditioning property	A	C

The composition of example iv was used as a control in table 2.

For example, a comparison between example 5 and example iv shows that the composition of example 5 made by the process of the present invention effectively delivers conditioning benefits to hair compared to the composition of example iv having the same amount of cationic surfactant and high melting point fatty compound but made by a different process.

Table 3 for composition 3

	Example v	Example vi
			Wet Condition before rinsing	C	C
Wet Conditioning after rinsing	C	C
			Dry conditioning property	C	C

The composition of example vi was used as a control in table 3.

For example, a comparison between example V and example vi, both containing a dialkyl cationic surfactant, shows that there is no significant difference between the conditioning benefits of example V made by method I and example vi made by method V.

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 alone, or in any combination with any other reference or references, teaches, suggests or discloses any such invention. Further, 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 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;

2. The method of any one of claims 1 to 4, wherein the mixing step (3) comprises the following detailed steps:

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

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

(3-3) forming an emulsion.

3. The method of any one of claims 1 to 4, 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, wherein the two phases reach the high shear field within 0.52 seconds or less of the first time they meet.

5. The method of claim 1, wherein the temperature of the emulsion is about 2 ℃ to about 60 ℃ below the melting point of the high melting point fatty compound.

6. 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.

7. The method of claim 6, 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.

8. A composition made by the method of claim 1.