WO2018121966A1

WO2018121966A1 - Oil-in-water type silicone emulsion composition

Info

Publication number: WO2018121966A1
Application number: PCT/EP2017/081740
Authority: WO
Inventors: Kenji Igarashi; Akira Murakami
Original assignee: Wacker Chemie Ag
Priority date: 2016-12-27
Filing date: 2017-12-06
Publication date: 2018-07-05
Also published as: JP2018104358A; JP6841654B2

Abstract

Provided is an oil-in-water type silicone emulsion composition in which an organopolysiloxane modified with a polar group having an action of coating a base material and an organopolysiloxane modified with a non-polar group exerting a lipophilic function can coexist stably or metastably in each of oil droplets, and that is easily produced, and is capable of sufficiently coating a base material and exerting the lipophilic function. Further provided is an oil-in-water type silicone emulsion composition that is effectively adhered to hair, in particular, after drying during use for hair cosmetics, can exert a touch effect such as a moist feeling, and can be easily produced. The oil-in-water type emulsion composition includes organopolysiloxanes represents by components (A) and (B), an organopolysiloxane represented by component (C) and/or hydrocarbon-based oil solution, and (D) : (A) an organopolysiloxane modified with a substituent selected from the group consisting of an alkyl group, an aryl group, an allyl group, an aralkyl group, and an epoxy group; (B) an organopolysiloxane modified with a substituent selected from the group consisting of an amino group, a polyether group, a hydroxyl group, a carboxyl group, a carbinol group, a mercapto group, and an acrylic group; (C) a dimethylpolysiloxane or dimethylpolysiloxane having a silanol group and/or a hydrocarbon-based oil solution; and (D) water, wherein the components (A), (B), and (C) coexist stably or metastably in oil droplets of the emulsion.

Description

DESCRIPTION

OIL-IN-WATER TYPE SILICONE EMULSION COMPOSITION TECHNICAL FIELD

[0001]

The present invention relates to an oil-in-water type emulsion composition that contains an organopolysiloxane as an oily component and has excellent preservation stability, and in particular, an oil-in-water type emulsion composition that is obtained by emulsifying a mixture of two or more modified silicone. polymers and is applied to a base material to add a function. More specifically, the present invention relates to an oil-in-water type emulsion composition for hair cosmetics that can be sufficiently adsorbed on hair to add a moist feeling and the like to hair.

BACKGROUND ART

[0002]

When a silicone is organically modified, various effects and functions can be added. Therefore, such an organically modified silicone has been conventionally used for wide use applications. In particular, a silicone to which a plurality of effects are added simultaneously is often required. This is significant when a base material is coated with the silicone to express a lipophilic function. Therefore, a silicone modified with two or more organic modifying groups, for example, a polar substituent having an adhesion action to a base material and a non-polar substituent exhibiting a

lipophilic function has been proposed. However, when a silicone is modified with the two or more organic modifying groups, there have been problems such as difficult production processes and production cost.

Further, the organically modified silicone is recently required to be in an emulsion form, but not to be in an oil form. This is because the silicone in an emulsion form is easy in handling, safe, and easy in mixing, and expresses an effective function.

[0003]

In cosmetic applications, a silicone is widely used as a material that adds various favorable functions such as a moist feeling, slide-ability, shine, moisture retention, and gloss to hair and skin by coating the hair and skin. A modifying group of the silicone is an important element of adding the functions. In general, only one modified silicone is unlikely to achieve desired properties. Therefore, two or more

modifying groups are necessary. For examples, in order to express a function of facilitating adhesion to hair or skin and a function of adding a moist feeling as a lipophilic function, two or more modifying groups are necessary. However, introduction of the two or more modifying groups into one silicone chain is difficult in production, and the cost becomes high. In cosmetic applications, supply of the silicone in an emulsion form is more advantageous than supply of the silicone in an oil form. This is because the silicone in an emulsion form is likely to be mixed in a water-based cosmetic, can be safely handled, and can be uniformly mixed in the cosmetic due to dispersion in a form of particles.

[0004]

In use applications for polishes, the silicone in an emulsion form is also advantageous in terms of production, cost, function, and safety. This is because adhesion to a base material and a function of adding shine are often necessary and mixing in a water-based end product is advantageous. In use applications for aluminum die casting, the silicone having two or more modifying groups is also required since both adhesion to a die and mold releasing properties of aluminum molded product are necessary. When the silicone is in an emulsion form, a thin and uniform coating film can be formed by applying the silicone to the die. Further, this silicone has excellent safety in terms of processes.

In use applications for various coatings and fiber treatments, the silicone having two or more modifying groups is also required. This is because adhesion to a base material for coating and lipophilic functions such as water repellency, softness, and heat resistance are often necessary. When the silicone is in an emulsion form, the silicone can be easily mixed in an end product, safely handled, uniformly applied to the base material, and treated. Further, the silicone has excellent safety in terms of processes.

[0005]

In the use applications described above, the silicone having two or more modifying groups is required. However, the silicone is unlikely to be produced and has a problem in terms of cost. Further, the silicone in an emulsion form is required in common in terms of easiness in handling, safety, easiness in mixing, and expression of function.

[0006]

In order to solve the problems and achieve emulsification, it is desirable that a mixture of two or more organically modified polymers be emulsified for the use applications.

However, the attempt to emulsify the mixture is restricted. In particular, an attempt to emulsify a mixture of two or more polymers having groups with different polarities is restricted to a combination of dimethylpolysiloxane with a polysiloxane having an amino-modified group. In other combinations, this attempt has not been tried.

[0007]

Conventionally, a silicone has been used for hair

cosmetics such as a shampoo, a conditioner, a hair treatment, a hair rinse, a hair pack, and an out bath treatment to decrease a squeaky feeling during cleaning and rinsing and provide a smooth touch including smoothness after drying and excellent manageability to hair. Such a silicone may be used as one of mixing components for hair cosmetics in a mixture with another mixing component. However, the silicone may be converted into an oil-in-water emulsion before mixing with the other mixing component. When the silicone is in an emulsion form, the silicone is formed into a form of particles having an appropriate particle size, and the effect of the silicone is further exerted. Further, when a highly viscous silicone that exhibits high effects on hair is used, the silicone is unlikely to be mixed directly with the other mixing component.

[0008]

An amino-modified organopolysiloxane has been widely used mainly for hair cosmetics as a silicone that adds an excellent effect of conditioning hair and the like. Since an amino group has an adsorption action on hair, the silicone is likely to be held in hair, and the effect of the silicone on hair as the cosmetics is likely to be exerted. The amino-modified

organopolysiloxane is also provided as an emulsified

composition, and mixed in cosmetics and the like.

However, it is difficult that the amino-modified

organopolysiloxane sufficiently exerts the action and effect so as to satisfy higher demands for hair, for example, a moist feeling after drying. [0009]

On the other hand, Patent Literature 1 discloses that a touch of hair is improved when an alkyl-modified

organopolysiloxane is mixed in hair cosmetics. Further, Patent Literature 2 discloses that an emulsion obtained by

emulsifying the alkyl-modified organopolysiloxane is used for the same purpose. Patent Literature 3 discloses that the alkyl-modified organopolysiloxane or a product obtained by dilution of the alkyl-modified organopolysiloxane with a cyclic siloxane is used for the same purpose.

[0010]

However, when the alkyl-modified organopolysiloxane is added alone, there have been problems in which adhesion to hair is low and an effect as cosmetics such as an effect of conditioning hair is insufficient as compared with the amino- modified organopolysiloxane. Even when the alkyl-modified organopolysiloxane is emulsified and then added, there have been the same problems.

[0011]

A method for adding an emulsion of the amino-modified organopolysiloxane and an emulsion of the alkyl-modified organopolysiloxane in combination may be used. However, the adhesion of the alkyl-modified organopolysiloxane to hair is not improved. Therefore, the potential excellent moist feeling of the alkyl-modified organopolysiloxane is not exerted. Accordingly, even when the emulsion of the amino-modified organopolysiloxane is mixed with the emulsion of the alkyl- modified organopolysiloxane to be used in combination, a desired effect is not obtained. Further, the viscosity of an end product is decreased due to the influence of an emulsifier contained in the emulsions.

In order to improve the adhesion of the alkyl-modified organopolysiloxane to hair, a method of emulsifying a mixed oil of the amino-modified organopolysiloxane and the alkyl- modified organopolysiloxane is also considered. However, this method is technologically difficult.

Patent Literature 4 discloses a method using a silicone modified with two functional groups in which an amino group and an alkyl group are introduced into one molecular chain of the silicone. However, the production of the modified silicone is complex and the cost thereof is high. Further, it is difficult that the composition is appropriately changed and optimized for demands for hair.

[0012]

In order to exert an excellent moist feeling by a treatment for hair, it is suggested that the emulsion of the amino-modified organopolysiloxane and the emulsion of the alkyl-modified organopolysiloxane are not mixed, but the amino-modified organopolysiloxane and the alkyl-modified organopolysiloxane coexist in each of oil droplets of an emulsion. Further, it is considered to be preferable that the amino-modified organopolysiloxane and the alkyl-modified organopolysiloxane coexist in a stable or metastable state under any binding function. In this state, the amino-modified organopolysiloxane and the alkyl-modified organopolysiloxane are affected with each other, and are tightly adhered to hair, resulting in coating. Therefore, it is expected that a moist feeling is exerted.

[0013]

In adhesion to skin and the like and expression of desired function for cosmetics other than the hair cosmetics as well as in adhesion to a base material and expression of desired lipophilic function in applications for the polishes, aluminum die casting, various coatings, fiber treatments, and the like, it is expected that two or more modified silicones need to exist in each of oil droplets of the emulsion and coexist in a stable or metastable state under any binding function.

The kinds of the modifying groups vary depending on the applications. As one of the modified silicones, a silicone into which a highly polar modifying group is introduced is commonly used to exert the adhesion to the base material in the use applications. For cosmetics and fibers, the amino- modified silicone is required since adhesion to a protein is necessary. For polishes, die casting, and various coating agents for metals, a silicone having a polar group such as a carboxyl group is required. The kind of the other modified silicone varies depending on the use applications. A silicone having an alkyl group or an allyl group is often required since a lipophilic function such as water repellency, hardness, or heat resistance is often demanded.

[0014]

In the aforementioned various use applications, it is generally necessary that intrinsic properties _. of a silicone modified with a polar group as a substituent of promoting adhesion to the base material and a silicone modified with a non-polar group as a substituent having lipophilic properties, that is, adhesion and lipophilicity lead to coating of the base material and extrinsic properties necessary for each of the use applications.

Therefore, an emulsion in which a silicone modified with a polar group and a silicone modified with a non-polar group, including a combination of the alkyl-modified silicone with the amino-modified silicone, exist in each of oil droplets is required for various types of use applications.

[0015]

A method of emulsifying two or more organically modified polymers that are each polar or non-polar in a stable or

metastable state is not disclosed in any known art.

Further, a silicone in which a moist feeling is added to hair after drying is not disclosed in any known art.

CITATION LIST PATENT LITERATURE

[0016]

Patent Literature 1: Japanese Patent Application Laid-

Open No. 2008-50280

Patent Literature 2: Japanese Patent Application Laid- Open No. 2008-74845

Patent Literature 3: Japanese Patent Application Laid- Open No. 2003-12466

Patent Literature 4: Japanese Patent Application Laid- Open No. 2008-143858

SUMMARY OF INVENTION TECHNICAL PROBLEM

[0017]

An object of the present invention is to provide an oil- in-water type silicone emulsion composition in which an

organopolysiloxane modified with a polar group having an

action of coating a base material and an organopolysiloxane modified with a non-polar group exerting a lipophilic function can coexist stably or metastably in each of oil droplets and that is easily produced, and is capable of sufficiently

coating the base material and exerting the lipophilic function. Another object of the present invention is to provide an oil- in-water type silicone emulsion composition that during use for hair cosmetics, can coat hair after drying by effective adhesion, can exert a touch effect such as a moist feeling, and can be easily produced.

SOLUTION TO PROBLEM

[0018]

The present inventors have found that when to two or more silicones that cannot be produced by an ordinary

emulsification method, a third component such as a

dimethylpolysiloxane is added, the problems can be solved. The present invention has thus been completed. Specifically, an oil-in-water type emulsion composition according to the present invention includes: organopolysiloxanes represents by the following (A) and (B) , an organopolysiloxane and/or a hydrocarbon-based oil solution represented by (C) , and (D) : (A) an organopolysiloxane modified with a substituent selected from the group consisting of an alkyl group, an aryl group, an allyl group, an aralkyl group, and an epoxy group; (B) an organopolysiloxane modified with a substituent selected from the group consisting of an amino group, a polyether group, a hydroxyl group, a carboxyl group, a carbinol group, a mercapto group, and an acrylic group; (C) a dimethylpolysiloxane or dimethylpolysiloxane having a silanol group and/or a

hydrocarbon-based oil solution; and (D) water, wherein the components (A) , (B) , and (C) coexist stably or metastably in oil droplets of the emulsion. [0019]

Further, the present inventors have found that when to a mixture of an alkyl-modified organopolysiloxane and an amino- modified organopolysiloxane that cannot be produced by an ordinary emulsification method, a dimethylpolysiloxane as a third component is added, the problems can be solved. The present invention has thus been completed. Specifically, an oil-in-water type silicone emulsion composition for hair cosmetics according to the present invention includes the following components (a) , (b) , (c) , and (d) : (a) an alkyl- modified organopolysiloxane; (b) an amino-modified

organopolysiloxane; (c) a dimethylpolysiloxane; and (d) water, wherein the components (a) , (b) , and (c) coexist stably or metastably in oil droplets of the emulsion. The present invention also provides a method for producing the emulsion composition, or a composition for hair cosmetics containing the emulsion.

[0020]

The emulsion composition for hair cosmetics may

preferably contain 0.01 to 70 parts by mass of the component (a), 0.01 to 70 parts by mass of the component (b) , and 0.01 to 70 parts by mass of the component (c) , relative to 100 parts by mass of the whole composition. The component (c) may preferably have a viscosity at 25°C of 10 to 60,000 mPa-s.

ADVANTAGEOUS EFFECTS OF INVENTION [0021]

The oil-in-water type emulsion composition according to the present invention provides an emulsion of two or more organopolysiloxanes that have not been conventionally

emulsified in oil droplets in a stable or metastable state, that is, an emulsion of organopolysiloxanes including a combination of a polar silicone polymer having an action of coating a base material by adhesion and a non-polar silicone polymer having a lipophilic function. When the oil-in-water type emulsion composition is applied to various use

applications, complexity and cost can be decreased as compared to the case where the separate organopolysiloxanes are used in combination. In addition, additive effect and synergistic effect of the organopolysiloxanes may be expected. In

particular, two or more organopolysiloxanes having different polarities and low compatibility are expected to

characteristically exert the effects thereof.

[0022]

When the oil-in-water type emulsion composition for hair cosmetics according to the present invention is mixed in a hair cosmetic, hair can be treated in a state where the alkyl- modified organopolysiloxane and the amino-modified

organopolysiloxane are uniformly mixed. Therefore, favorable properties of the respective organopolysiloxanes, that is, adhesion to hair and an effect of adding a moist feeling and manageability to hair can be synergistically exerted. In particular, a silicone component can be stably held in hair after drying for an extended period and an excellent moist feeling can be maintained. Further, a water-retaining effect, an effect of adding a moist feeling to damaged hair, and an antistatic effect for hair can be expected.

An effect of maintaining an excellent moist feeling is remarkably high as compared to a treatment for hair with the alkyl-modified organopolysiloxane and the amino-modified organopolysiloxane in combination or a treatment for hair with emulsion of the alkyl-modified organopolysiloxane and the emulsion of the amino-modified organopolysiloxane in

combination. Therefore, the present inventors have

unexpectedly found that the effects of the alkyl-modified organopolysiloxane and the amino-modified organopolysiloxane or the effects of the emulsions thereof are synergistically exerted.

[0023]

In the oil-in-water type emulsion composition for hair cosmetics according to the present invention, complexity and cost in production can be largely decreased as compared to an organopolysiloxane in which both an alkyl group and an amino group are introduced into one siloxane molecular chain. Since the oil-in-water type emulsion composition for hair cosmetics is water-based, the composition has a merit in terms of safety and environment. Therefore, the components are very easily adjusted according to detailed demands of the use applications.

The amount of the whole emulsion can be decreased as compared to the treatment for hair with the alkyl-modified organopolysiloxane and the amino-modified organopolysiloxane in combination. Therefore, a decrease in viscosity of the end product due to a surfactant does not occur.

DESCRIPTION OF EMBODIMENTS

[0024]

Hereinafter, the oil-in-water type emulsion composition and the oil-in-water type emulsion composition for hair

cosmetics according to the present invention will be described in detail.

[0025]

(Component (A) )

The component (A) in the present invention is an

organopolysiloxane modified with a substituent selected from the group consisting of an alkyl group, an aryl group, an allyl group, an aralkyl group, and an epoxy group. This group represents a group exerting a function that is basically

lipophilic for a base material including hair according to the use applications.

The number of such a group in the siloxane molecular chain may be at least one, or two or more. In addition to the aforementioned group, any group may be contained. The number of carbon atoms and the introduction ratio of the alkyl group, the aryl group, the aralkyl group, and the epoxy group are not limited. A group having an alicyclic structure is included in the alkyl group. Further, the molecular weight, skeleton structure, and viscosity of the organopolysiloxane modified with the group are not limited. The component (A) may be a mixture.

[0026]

(Component (B) )

The component (B) in the present invention is an

organopolysiloxane modified with a substituent selected from the group consisting of an amino group, a polyether group, a hydroxyl group, a carboxyl group, a carbinol group, a mercapto group, and an acrylic group. This group represents a group exerting an adhesion function to a base material including hair.

The number of such a group in the siloxane molecular chain may be at least one, or two or more. In addition to the aforementioned group, any group may be contained.

The number of carbon atoms and the introduction ratio of the amino group, the polyether group, the hydroxyl group, the carboxyl group, the carbinol group, the mercapto group, and the acrylic group are not limited. Further, the molecular weight, skeleton structure, and viscosity of the

organopolysiloxane modified with the group are not limited. The component (B) may be a mixture.

[0027]

(Component (C) )

The component (C) in the present invention is a

dimethylpolysiloxane, a dimethylpolysiloxane having a silanol group, and/or a hydrocarbon-based oil solution.

[0028]

A silanol group in the dimethylpolysiloxane having a silanol group may be disposed at a terminal of the molecular chain or a side chain. The number of moles of the silanol group is not limited.

The chemical structure of the hydrocarbon-based oil solution is not limited. A commercially available oil solution may be used. Examples thereof may include mineral oil and liquid paraffin.

The molecular weight, skeleton structure, and viscosity of the dimethylpolysiloxane, the dimethylpolysiloxane having a silanol group, and the hydrocarbon-based oil solution are not limited.

[0029]

The oil-in-water type emulsion. composition of the present invention contains the components (A) and (B) and the

organopolysiloxane or the hydrocarbon-based oil solution of the component (C) .

The contents and the quantitative ratio of the components (A) , (B) , and (C) in the emulsion are not limited. Any contents and quantitative ratio can be used.

[0030]

(Component (a) )

The component (a) in the present invention is an alkyl- modified organopolysiloxane having an average composition represented by a general formula (1) . The alkyl-modified organopolysiloxane is a component that is basically lipophilic in an aqueous emulsion and adds a moist feeling to hair.

In the formula (1) , R¹s may be the same or different from each other in a molecule, and are each selected from the group consisting of an unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, a hydrogen atom, and a hydroxyl group. Examples of the unsubstituted monovalent hydrocarbon group may include a methyl group; a cycloalkyl group such as a cyclopentyl group and a cyclohexyl group; an aryl group such as a phenyl group; and an aralkyl group such as a 2- phenylethyl group and a 2-phenylpropyl group. Among these, it is preferable that Ri be a methyl group and/or a phenyl group. It is more preferable that 50% by mole or more of R¹ be a methyl group. R¹ may partially contain an alkoxy group having 1 to 3 carbon atoms .

[0031]

In the formula (1), R²s may be the same or different from each other in a molecule, and are each a hydrocarbon group including an alkyl group other than a methyl group. The number of carbon atoms in R² is 2 to 40.

[0032]

Examples of the alkyl group may include an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an n-hexyl group, an n-heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, an eicosyl group, a heneicosyl group, a docosyl group, a tetracosyl group, a pentacosyl group, a hexacosyl group, a heptacosyl group, an octacosyl group, a triacontyl group, a tetratriacontyl group, an octatriacontyl group, a tetracontyl group, a 2-heptylundecyl group, a 2-undecylpentadecyl group, a 2-decyltetradecyl group, a 2-decylpentadecyl group, a 2- ethylhexyl group, a 2-octyldodecyl group, a 2- undecyltetradecyl group, a methyl branched isostearyl group, a methyl branched dodecyl group, and a methyl branched nonyl group .

In order to add a moist feeling to hair, it is preferable that the alkyl chain length be longer, that is, the number of carbon atoms be larger. From the viewpoint of cost and

easiness in production, an alkyl group having 8 or more and 50 or less carbon atoms is preferable. [0033]

In the formula (1), a and b are each a natural number showing an average number of substituents R¹ and R²,

respectively, that are bonded to the silicon of the alkyl- modified organopolysiloxane, and (a + b) is 1.8 to 2.2. The molecular structure of the organopolysiloxane may be not only linear but also branched, and is preferably linear.

[0034]

A ratio a/b of the average number a of R¹ having no alkyl group of two or more carbon atoms to the average number b of R² having an alkyl group of two or more carbon atoms is 0.5 to

100. The ratio a/b is an index of ratio of a siloxane unit having no alkyl group to a siloxane unit having an alkyl group.

When this ratio is more than 600, the melting point increases, the handling is difficult, and sticky of hair increases. When the ratio is less than 15, an effect of adding a moist feeling to hair decreases.

[0035]

The melting point of the alkyl-modified

organopolysiloxane of the component (a) is 10 to 60°C, and preferably 20 to 50°C. The melting point of the

organopolysiloxane is measured by a differential scanning calorimeter (DSC) .

In order to add a moist feeling to hair, the alkyl group having 8 or more and 50 or less carbon atoms is preferable. Therefore, the preferable range of the melting point is 10 to

60°C.

[0036]

The alkyl-modified organopolysiloxane used as the component (a) in the present invention is generally known as an alkyl-modified organopolysiloxane oil. The alkyl-modified organopolysiloxane can be produced by a method publicly known by those of skill in the art. A representative method for synthesizing the alkyl-modified organopolysiloxane oil is as follows. Specifically, the most common method is a method in which a hydrocarbon compound having an alkenyl group at one terminal is reacted with an organopolysiloxane having a hydrogen atom bonded to a silicon atom at a side chain by a catalysis action such as an addition reaction catalyst containing platinum, to introduce an alkyl group into the organopolysiloxane .

When the ratio of the hydrocarbon compound used in production is adjusted, an alkyl-modified organopolysiloxane oil having a specific melting point can be obtained. When the melting point of the alkyl-modified organopolysiloxane oil falls within the scope of the present invention, the alkyl- modified organopolysiloxane oil may be used alone or a mixture of two or more kinds thereof may be used.

[0037]

In the emulsion of the present invention, the content of the component (a) in the present invention is 0.01 to 70 parts by mass relative to 100 parts by mass of the whole emulsion. When the content is less than 0.01 parts by mass, the effect of conditioning hair decreases. When it is more than 70 parts by mass, the viscosity of the aqueous emulsion increases, and the handling properties deteriorate. The content is more preferably 5 to 30 parts by mass. When the content is less than 5 parts by mass, the conditioning effect is insufficient, and the synergistic effect with the amino-modified

organopolysiloxane (b) is not sufficiently exerted. When the content is more than 30 parts by mass, a mixture of the components (a) to (c) is coagulated. For this reason, a heating device is necessary in the production process.

Therefore, the production is complex and economically

disadvantageous.

[0038]

(Component (b) )

The component (b) in the present invention is an amino- modified organopolysiloxane having an average composition represented by a general formula (2) . The amino-modified organopolysiloxane is a component of providing a smooth touch and manageability to hair in the aqueous emulsion.

In the formula (2) , R³s may be the same or different in the molecule, and is selected from an unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, a hydrogen atom, and a hydroxyl group. Examples of the unsubstituted monovalent hydrocarbon group may include the same groups as those shown in R₁ in the formula (1) . R³ may partially contain an alkoxy group having 1 to 3 carbon atoms.

[0039]

R⁴ in the formula (2) is a hydrocarbon group containing one or two or more amino groups, and is represented by the following formula (3) .

In the formula (3), R⁵ and R⁷ are a divalent CI to C18 hydrocarbon group, R⁶, R⁸, and R⁹ are a hydrogen atom or an unsubstituted Cl to CIO alkyl group, and t is an integer of 0 to 6.

[0040]

Examples of the divalent Cl to C18 hydrocarbon group of R⁵ and R⁷ may include a methylene group, an ethylene group, an n-propylene group, an iso-propylene group, an n-butylene group, an iso-butylene group, a t-butylene group, an n-pentylene group, an iso-pentylene group, a hexylene group such as an n- hexylene group, a heptylene group such as an n-heptylene group, an octylene group such as an n-octylene group and an iso- octylene group, a 2, 2, 4-trimethylpentylene group, a nonylene group such as an n-nonylene group, a decylene group, a

dodecylene group such as an n-dodecylene group, and an octadecylene group. Examples of the alkyl group of R⁶, R⁸, and R⁹ may include CI to CIO alkyl groups of those exemplified by Ri.

[0041]

Preferable examples of R⁴ may include

For cosmetics, R² is preferably

and particularly preferably

[0042]

In the formula (2), c and d are each a natural number showing an average number of substituents R³ and R⁴,

respectively, that are bonded to the silicon of the amino- modified polyorganosiloxane, and (c + d) is 1.8 to 2.2. The molecular structure of the organopolysiloxane may be not only linear but also branched, and is preferably linear.

[0043]

A ratio c/d of the average number c of R³ having no amino group to the average number d of R⁴ containing one or two or more amino groups is 15 to 600. The ratio is an index of ratio of a siloxane unit having no amino group to a siloxane unit having an amino group. As an indication of the total amount of amino groups in the amino-modified organopolysiloxane, an amine number represented by the volume (mL) of 1 N

hydrochloric acid required for neutralization of 1 g of the siloxane is also used. The amine number varies depending on the number of amino groups in the molecule of the amino- modified organopolysiloxane and the molecular weight thereof. The amine number of the amino-modified organopolysiloxane in the present invention needs to be 0.1 to 3.0, and is

preferably 0.15 to 2.0. When the amine number is less than 0.1, the adsorption ability on the surface of hair decreases. When the amine number is more than 3.0, the number of amino groups as a hydrophilic group excessively increases, to inhibit the adsorption on hair.

[0044]

The viscosity of the amino-modified organopolysiloxane

(b) in the present invention at 25°C is 100 to 10,000 mPa-s, and preferably 200 to 4,000 mPa-s. When the viscosity is less than 100 mPa-s, the effect of conditioning hair cannot be sufficiently obtained. When it is more than 10,000 mPa-s, smoothness and manageability cannot be added to hair up to the tips thereof.

[0045]

The amino-modified organopolysiloxane used as the

component (b) in the present invention is commonly known as an amino-modified organopolysiloxane oil, and can be produced by a method well known to those of skill in the art. A

representative method for synthesizing the amino-modified organopolysiloxane oil is as follows. That is, introduction of an amino alkyl group to a silicon atom is usually performed in the state of silane. Thus, amino alkyl silane is first

produced. The amino alkyl silane is hydrolyzed into an amino group-containing siloxane oligomer or an amino group- containing disiloxane. Further, a re-equilibration reaction of an Si-0 bond is performed with a linear oligomer or a cyclic oligomer of dimethylsiloxane in the presence of an alkali catalyst, to obtain an amino-modified organopolysiloxane oil. When hexamethyl disiloxane is used in the re-equilibration reaction, an amino-modified organopolysiloxane oil having trimethylsilyl at terminals is obtained. When the ratio by mass of oligomers or disiloxanes used in the production is adjusted, an amino-modified organopolysiloxane oil having a specific kinematic viscosity and a specific amine number can be obtained. The amino-modified organopolysiloxane oil may be used alone, or two or more kinds thereof may be used as a mixture as long as the kinematic viscosity and the amine number fall within the respective ranges of the present invention.

[0046]

In the emulsion of the present invention, the content of the component (b) in the present invention is 0.01 to 70 parts by mass relative to 100 parts by mass of the whole emulsion. When the content is less than 0.01 parts by mass, the effect of conditioning hair decreases. When it is more than 70 parts by mass, the viscosity of the aqueous emulsion increases, and the handling properties deteriorate. The content is more preferably 5 to 30 parts by mass. When the content is less than 5 parts by mass, the conditioning effect is insufficient, and the synergistic effect with the alkyl-modified

organopolysiloxane (a) is not sufficiently exerted. When the content is more than 30 parts by mass, a catching feeling during rinsing increases, and the touch is degraded.

[0047]

The ratio by mass of the amino-modified

organopolysiloxane represented by the formula (2) to the alkyl-modified organopolysiloxane represented by the formula (1) in the component (b) is preferably 1/20 to 2/1, and more preferably 1/15 to 1/2. When it is less than 1/20, sufficient smoothness and a moist feeling after drying cannot be

sufficiently added to hair. When it is more than 2/1, that is, the ratio of the amino-modified organopolysiloxane is high, the stability of the emulsion decreases, and a sufficient touch effect cannot be added to hair.

[0048]

(Component (c) )

The component (c) in the present invention is a dimethylpolysiloxane. The dimethylpolysiloxane is a component having a function of adjusting a state where the alkyl- modified organopolysiloxane of the component (a) and the amino-modified organopolysiloxane of the component (b) are uniformly mixed in the emulsion. The component (c) is a

component that extracts the properties of the components (a) and (b) , and as the case, extracts the synergistic effect of the components (a) and (b) . In addition, the component (c) is a component of adding a smooth touch and smoothness to hair. The component (c) is, at least, not a component of inhibiting the effects of the components (a) and (b) .

[0049]

The molecular structure of the dimethylpolysiloxane may be. not only linear but also branched, and is preferably linear. The dimethylpolysiloxane in the present invention can be

produced by a method known to the person skilled in the art. Specific examples of preferable dimethylpolysiloxane, that is, dimethicone may include a trimethylsiloxy-terminated

dimethicone and a hydroxy-terminated dimethicone. As the dimethylpolysiloxane of the component (c) in the present

invention, trimethylsiloxy-terminated dimethicone is

preferably used from the viewpoint of easy availability and excellent cost efficiency.

[0050]

The solubility parameters (hereinafter abbreviated to "SP") of the alkyl-modified organopolysiloxane of the component (a) and the amino-modified organopolysiloxane of the component (b) are relatively close to each other. However, the compatibility between the components (a) and (b) is lower than expected. This is considered because a highly polar amino group exists locally. Therefore, the mixture of the alkyl- modified organopolysiloxane and the amino-modified

organopolysiloxane or an emulsion in which the alkyl-modified organopolysiloxane and the amino-modified organopolysiloxane are co-emulsified does not stably exist.

When a dimethicone having substantially the same SP as that of the amino-modified organopolysiloxane of the component (b) is interposed between the alkyl-modified

organopolysiloxane and the amino-modified organopolysiloxane, a uniformly mixed state as the whole is obtained while a distance between the alkyl-modified organopolysiloxane of the component (a) and the amino-modified organopolysiloxane of the component (b) is kept in the emulsion. The present inventors have found that the component (c) in the present invention has a function of adjusting the uniformly mixed state.

The component (C) that is at least one kind of

organopolysiloxane or hydrocarbon-based oil solution selected from the group consisting of a dimethylpolysiloxane, a

dimethylpolysiloxane having a silanol group, and a

hydrocarbon-based oil solution has a function of adjusting the uniformly mixed state where the component (A) that is at least one kind of organopolysiloxane selected from the group

consisting of organopolysiloxanes modified with an alkyl group, an aryl group, an aralkyl group, and an epoxy group and the component (B) that is at least one kind of organopolysiloxane selected from the group consisting of organopolysiloxanes modified with an amino group, a polyether group, a hydroxyl group, a carboxyl group, a carbinol group, a mercapto group, and an acrylic group are uniformly mixed. The function of the component (C) is the same as that of the component (c) .

[0051]

The viscosity of the dimethylpolysiloxane of the

component (c) is not limited. The viscosity at 25°C is

preferably 10 to 60,000 mPa-s. When the viscosity falls within this range, the components (a) and (b) can be sufficiently incorporated, and the emulsion to be obtained can stably exist. When the viscosity is less than 10 mPa^«s, the action in which the component (c) incorporates the components (a) and (b) decreases. When the viscosity is more than 60,000 mPa^«s, the stability of the emulsion decreases. The viscosity is more preferably within a range of 100 to 40,000 mPa-s.

The dimethylpolysiloxane of the component (c) may be a mixture of two or more dimethylpolysiloxanes having different viscosities as dimethylpolysiloxanes having high and low

viscosities as long as the viscosities fall within the range. The mixture is rather preferable since the adhesion to hair is improved. This is because the mixture contains a larger amount of organopolysiloxane component having a high degree of polymerization and high viscosity as compared to the case where an organopolysiloxane having a single molecular weight distribution is used.

[0052]

In the emulsion of the present invention, the content of the component (c) in the present invention is 0.01 to 70 parts by mass relative to 100 parts by mass of the whole emulsion. When the content is less than 0.01 parts by mass, the

components (a) and (b) cannot be uniformly mixed in the emulsion. When the content is more than 70 parts by mass, the relative concentration of the components (a) and/or (b) in the emulsion decreases. Therefore, the silicone is unlikely to be held in hair, and/or a moist feeling to hair is unlikely to be expressed. The content of the component (c) is more preferably 10 to 50 parts by mass. When the content falls within this range, the components (a) and (b) are sufficiently uniformly mixed in oil droplets of the emulsion, and the components can be uniformly adhered to hair.

[0053]

The oil-in-water type silicone emulsion composition of the present invention usually contains a surfactant. The surfactant is a component of emulsifying the components (a) , (b) , and (c) . As the surfactant, a surfactant generally used in production of silicone emulsion is usually used. Examples thereof may include cationic, anionic, nonionic, and

amphipathic surfactants, and silica particles that act as a surfactant. The nonionic surfactant is preferable since it does not adversely affect the environment and exhibits low irritation to the body. In particular, polyoxyethylene

hydrogenated castor oil and polyoxyethylene castor oil are preferable. In the present invention, the addition molar number of ethylene oxide of polyoxyethylene hydrogenated

castor oil or polyoxyethylene castor oil is preferably 60 or more. When polyoxyethylene hydrogenated castor oil or

polyoxyethylene castor oil of which the addition molar number of ethylene oxide of is less than 60 is added, the particle diameter of the resulting emulsion increases as compare to the case where the polyoxyethylene hydrogenated castor oil or polyoxyethylene castor oil having an addition molar number of ethylene oxide of 60 or more is added in the same amount.

Therefore, this is not preferable in terms of preservation stability of the emulsion, and has a problem in which the amount of the surfactant to be added needs to further increase.

In the emulsion of the present invention, the content of the surfactant in the present invention is 1 to 10% by mass. When it is less than 1% by mass, emulsification is difficult. When it is more than 10% by mass, the viscosity of the aqueous emulsion composition increases, and the handling properties deteriorate, The content is more preferably 3 to 7% by mass.

[0054]

In the oil-in-water type silicone emulsion composition of the present invention, the total amount of the components (a) to (c) is not limited. The total amount of the components (a) to (c) in 100 parts by mass of the emulsion composition is preferably 10 to 70 parts by mass. When the total amount is less than 10 parts by mass, a conditioner effect is

insufficient in mixing in a cosmetic. When it is more than 70 parts by mass, the dispersion stability and preservation stability of the emulsion are insufficient, and the emulsion composition is unlikely to be uniformly mixed in the cosmetic.

[0055]

Water (component (D) or component (d) ) in the present invention is not particularly limited, and ion exchanged water is preferably used. The pH thereof is preferably 2 to 12, and particularly preferably 4 to 10. Use of mineral water is not recommended. But if mineral water is used, it is desirable that a metal deactivator or the like be used together. The amount of water to be added in emulsification corresponds to an amount. of 40 to 90% by mass, and preferably 40 to 60% by mass in the emulsion of the present invention. Even when the emulsion of the present invention is diluted with water, the emulsion is stable. After preparation of the emulsion, the emulsion may be further diluted. The amount of water in a diluted emulsion is not particularly limited.

[0056]

The emulsion composition of the present invention may contain a component acceptable as a mixing component of hair cosmetics without impairing the object of the present

invention. Examples of such a component may include an antiseptic such as a quaternary ammonium-containing compound, phenoxyethanol, sodium benzoate, methylparaben, propylparaben, salicylic acid, glycerin, butylene glycol, propylene glycol, and isopropanol, an amino acid-based activating agent, various surfactants, a thickener such as guar gum and xanthan gum, and a perfume.

[0057]

The method for producing the emulsion composition of the present invention is not particularly limited, and may be a known method. For example, the emulsion composition can be prepared by mixing and emulsifying the aforementioned

components using a common mixer suitable for the production of an emulsion, such as a homogenizer, a colloid mill, a

homomixer, or a high-speed rotor stator mixer. The

emulsification can be performed by a method for mixing and stirring all the components (A) to (D) or the components (a) to (d) to prepare an oil-in-water type emulsion, or a method in which the components (A) to (C) or the components (a) to (c) are emulsified stepwise using a surfactant or silica particles and remaining water, surfactant, and silica

particles are further added to the emulsion, followed by stirring, to prepare an oil-in-water type emulsion. Herein, it is necessary that the component (C) or (c) exert a function for binding the components (A) and (B) or (a) and (b) ,

respectively, for coexistence.

A method in which a water-in-oil type emulsion is first prepared and an oil-in-water type emulsion is then prepared is preferable since the particle size of the emulsion is easily adjusted and the emulsion is stable.

[0058]

In oil droplets of the oil-in-water type silicone emulsion of the present invention, the components (a) and (b) cannot coexist stably or metastably. However, when the component (c) is added during production of the emulsion, followed by emulsification, the components (a) , (b) , and (c) may coexist stably or metastably in the oil droplets of the emulsion. Therefore, it is preferable that the component (c) be added in the method for producing the oil-in-water type emulsion composition for hair cosmetics of the present

invention. Specifically, it is preferable that the component (a) be mixed in the component (c) and the component (b) be mixed in the mixture, or the component (b) be mixed in the component (c) and the component (a) be mixed in the mixture, followed by emulsification. When the components (a) and (b) are mixed, phase separation occurs. This is because the components (a) and (b) are not compatible with each other. In particular, the component (a) is ununiformly dispersed in a mixing container since the component (a) is usually a solid. When the components (a) and (c) are. mixed to prepare a uniform liquid mixture and the component (b) is then added to the mixture, the components (b) and (c) are dissolved

substantially spontaneously. Therefore, the mixing state of the components (a) to (c) is favorable in this method. When the emulsion is finally obtained, the component (c) allows the components (a) and (b) to coexist stably or metastably.

It is preferable that the component (a) be heated to a temperature equal to or higher than, the melting point and mixed with another component in a melted state. Before an emulsification step, a state where phase separation of the components (a) , (b) , and (c) does not occur is confirmed. It is preferable that the emulsification step be performed while the state is maintained.

[0059]

By the binding action due to the components (C) or (c) , the components (A) and (B) or (a) and (b) coexist stably or metastably in the oil droplets of the emulsion. Therefore, when the emulsion is applied to hair or the like, the hair or the base material can be coated with components of the oil droplets while the components (A) and (B) or (a) and (b) are mixed to some extent. Accordingly, the components coexist without occurrence of phase separation. In this case, the component (B) or (b) can express a sufficient adhesion

function to the base material. This is an action that is not obtained by application of separate emulsions of the

respective components (A) and (B) or (a) and (b) in

combination or application of the mixture of the separate emulsions of the respective components (A) and (B) or (a) and (b) to the base material.

[0060]

The emulsion particle size of the oil-in-water type silicone emulsion composition of the present invention is not limited, and is desirably about 1 μm or less. When the particle size is more than 1 μm, the stability of the emulsion is reduced, and the emulsion is unlikely to be stably mixed in the cosmetic or the like.

Examples

[0061]

Hereinafter, the present invention will be described by way of Examples. However, the present invention is not limited by these Examples. Methods for evaluating an oil-in-water type silicone emulsion of the present invention in Examples and conditioner compositions in Examples and Comparative Examples are as follows. All viscosities were measured at 25°C. [0062]

30 G of a prepared oil-in-water type silicone emulsion was added to a 50-mL screw tube. The presence or absence of creaming and sedimentation was observed in an initial state and after storage at room temperature or 40°C for one month. Evaluation criteria:

A: no creaming and no sedimentation observed

B: creaming and sedimentation hardly observed

C: some degree of creaming and sedimentation observed

D: creaming and sedimentation observed

[0063]

Evaluation of Conditioner Composition: A hair bundle having a length of 25 cm and a weight of 2.0 g was rubbed with 1.0 g of a prepared composition for one minute, and rinsed under running water of 40°C for one minute. This process was repeated three times.

The hair bundle was dried at 25°C for one day. A moist feeling, smoothness, softness, and gloss of the hair bundle were evaluated by three panelists.

The evaluation was performed by the three panelists with a paired comparison method.

Evaluation criteria:

Samples were each ranked by the panelists according to the sum of relative evaluation values of each of the samples. A: Very good

B: Relatively good

C: Relatively fair

D: Relatively poor

[0064]

An alkyl-modified organopolysiloxane having a melting point of 35°C as the component (a) was melted at 40°C. 10 Parts by mass of the melted alkyl-modified organopolysiloxane was mixed in 30 parts by mass of trimethylsilyl-terminated dimethylpolysiloxane having a viscosity of 12,500 mPa^«s as the component (c) . In the mixture, 5 parts by mass of N-(2- aminoethyl) -3-aminopropyl group-containing

dimethylpolysiloxane (amodimethicone) having a viscosity of

2,000 mPa-s and an amine number of 0.6 as the component (b) was mixed, to obtain an oily mixture without occurrence of phase separation.

Before the oily mixture was phase-separated, 5 parts by mass of polyoxyethylene hydrogenated castor oil having an addition number of ethylene oxide of 200 mol as a surfactant and 50 parts by mass of purified water were stirred in 45 parts by mass of the organopolysiloxane mixture at room temperature and 3,000 rpm for 20 minutes by ULTRA-TURRAX T50 basic shaft generator G45G manufactured by IKA, to obtain an oil-in-water type silicone emulsion 1. The formulation is shown in Table 1.

The stability of the oil-in-water type silicone emulsion

1 was evaluated. The results are shown in Table 2.

Subsequently, a conditioner composition was produced using the oil-in-water type silicone emulsion 1 as shown in Table 3. The effect of adding a touch (moist feeling,

smoothness, softness, and gloss) to hair was evaluated. The results are shown in Table 4.

[0065]

An oil-in-water type silicone emulsion 2 was obtained in the same manner as that in Example 1, except that a phenyl modified silicone having a viscosity of 1,000 mPa-s was used as the component (a) , and the addition of the component (a) was performed at normal temperature. The formulation is shown in Table 1.

The stability of the oil-in-water type silicone emulsion

2 was evaluated. The results are shown in Table 2.

Subsequently, a conditioner composition was produced using the oil-in-water type silicone emulsion 2 as shown in Table 3. The effect of adding a touch (moist feeling,

[0066] <Example 3>

An oil-in-water type silicone emulsion 3 was obtained in the same manner as that in Example 1, except that

trimethylsilyl-terminated dimethylpolysiloxane having a viscosity of 70,000 mPa-s was used as the component (c) . The formulation is shown in Table 1.

The stability of the oil-in-water type silicone emulsion 3 was evaluated. The results are shown in Table 2.

Subsequently, a conditioner composition was produced using the oil-in-water type silicone emulsion 3 as shown in Table 3. The effect of adding a touch (moist feeling,

[0067]

An alkyl-modified organopolysiloxane having a melting point of 35°C was melted at 40°C. 30 Parts by mass of the melted alkyl-modified organopolysiloxane was mixed with 15 parts by mass of N- (2-aminoethyl) -3-aminopropyl group- containing dimethylpolysiloxane (amodimethicone) having a viscosity of 2,000 mPa-s and an amine number of 0.6. In the mixture, a tendency of phase separation was slightly seen. In 45 parts by mass of the organopolysiloxane mixture, 5 parts by mass of polyoxyethylene hydrogenated castor oil having an addition number of ethylene oxide of 200 mol as a surfactant and 50 parts by mass of purified water were stirred at room temperature and 3,000 rpm for 20 minutes by ULTRA-TURRAX T50 basic shaft generator G45G manufactured by IKA, to obtain an oil-in-water type silicone emulsion 4. The formulation is shown in Table 1.

The stability of the oil-in-water type silicone emulsion 4 was evaluated. The results are shown in Table 2.

[0068]

67 Parts by mass of trimethylsilyl-terminated

dimethylpolysiloxane having a viscosity of 12,500 mPa-s, 22 parts by mass of alkyl-modified organopolysiloxane having a melting point of 35°C, and 11 parts by mass of N-(2- aminoethyl) -3-aminopropyl group-containing

dimethylpolysiloxane (amodimethicone) having a viscosity of

2,000 mPa-s and an amine number of 0.6 were mixed to obtain an organopolysiloxane mixture 1. The formulation is shown in Table 1.

Subsequently, a conditioner composition was produced using the organopolysiloxane mixture 1 as shown in Table 3. The effect of adding a touch (moist feeling, smoothness, softness, and gloss) to hair was evaluated. The results are shown in Table 4.

[0069]

<Comparative Example 3> An oil-in-water type silicone emulsion was obtained in the same manner as that in Example 1, except that only 45 parts by mass of alkyl-modified organopolysiloxane having a melting point of 35°C as the component (a) , 45 parts by mass of amodimethicone having a viscosity of 2,000 mPa-s as the

component (b) , or 45 parts by mass of dimethylpolysiloxane having a viscosity of 12,500 mPa-s as the component (c) was used in place of the mixture of the components (a) , (b) , and (c) . The oil-in-water type silicone emulsion obtained from the alkyl-modified organopolysiloxane having a melting point of

35°C was referred to as an oil-in-water type silicone emulsion 5. The oil-in-water type silicone emulsion obtained from the amodimethicone having a viscosity of 2,000 mPa-s was referred to as an oil-in-water type silicone emulsion 6. The oil-in- water type silicone emulsion obtained from the

dimethylpolysiloxane having a viscosity of 12,500 mPa-s was referred to as an oil-in-water type silicone emulsion 7. The respective formulations are shown in Table 1.

Subsequently, each conditioner composition was produced using each of 1.0 part by mass of the oil-in-water type silicone emulsion 5, 0.5 parts by mass of the oil-in-water type silicone emulsion 6, and 2.9 parts by mass of the oil-in- water type silicone emulsion 7, as shown in Table 3. The effect of adding a touch (moist feeling, smoothness, softness, and gloss) to hair was evaluated. The results are shown in

[0074]

As seen from comparison between Examples and Comparative Example in Table 2, the stability of the oil-in-water type silicone emulsion composition of the present invention formed from the components (a) to (c) is favorable.

As seen from comparison between Examples and Comparative Example in Table 4, the conditioner composition in which the oil-in-water type silicone emulsion compositions using the components (a) to (c) in the present invention are each incorporated adds a favorable touch including a moist feeling to hair by a treatment for hair.

Industrial Applicability

[0075]

The oil-in-water type silicone emulsion composition of the present invention can add a moist feeling and the like to hair after drying, has an appropriate emulsion particle size, and is stably stored for an extended period. Therefore, the oil-in-water type silicone emulsion composition is useful as a raw material for hair cosmetics such as a shampoo and a conditioner.

Claims

1. An oil-in-water type emulsion composition comprising: organopolysiloxanes represents by components (A) and (B) , an organopolysiloxane and/or a hydrocarbon-based oil solution represented by a component (C) , and (D) , wherein

the component (A) is an organopolysiloxane modified with a substituent selected from the group consisting of an alkyl group, an aryl group, an allyl group, an aralkyl group, and an epoxy group;

the component (B) is an organopolysiloxane modified with a substituent selected from the group consisting of an amino group, a polyether group, a hydroxyl group, a carboxyl group, a carbinol group, a mercapto group, and an acrylic group;

the component (C) is a dimethylpolysiloxane or

dimethylpolysiloxane having a silanol group and/or a

hydrocarbon-based oil solution; and- the (D) is water, wherein

the components (A) , (B) , and (C) coexist stably or metastably in oil droplets of an emulsion.

2. An oil-in-water type emulsion composition for hair cosmetics comprising components (a) , (b) , (c) , and (d) :

(a) an alkyl-modified organopolysiloxane,

(b) an amino-modified organopolysiloxane,

(c) a dimethylpolysiloxane, and

(d) water, wherein the components (a) , (b) , and (c) coexist stably or metastably in oil droplets of an emulsion.

3. The oil-in-water type emulsion composition for hair cosmetics according to claim 2, wherein

the emulsion composition for hair cosmetics contains 0.01 to 70 parts by mass of the component (a), 0.01 to 70 parts by mass of the component (b) , and 0.01 to 70 parts by mass of the component (c) , relative to 100 parts by mass of the whole composition, and

the component (c) has a viscosity at 25°C of 10 to 60,000 mPa-s .

4. A method for producing the oil-in-water type emulsion composition for hair cosmetics according to claim 3, the emulsion composition including the components (a) , (b) , (c) , and (d) :

(a) an alkyl-modified organopolysiloxane,

(b) an amino-modified organopolysiloxane,

(c) a dimethylpolysiloxane, and

(d) water,

the method comprising adding the component (c) for emulsification, thereby allowing the components (a) , (b) , and (c) to coexist stably or metastably in oil droplets of an emulsion.

5. A composition for hair cosmetics comprising the oil-in- water type emulsion composition according to claim 2 or 3.