JP3118192B2 - Water-in-oil emulsion composition and skin cosmetic - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-in-oil type emulsified composition which is non-greasy and has excellent emulsification stability and a skin cosmetic containing the same.

[0002]

2. Description of the Related Art Conventionally, hydrocarbon-based oils such as liquid paraffin and squalane have been widely used as oil components in water-in-oil emulsion compositions. Covering with an oil film prevents water evaporation, which is effective for rough skin. Facial cosmetics using these oils have a high treatment effect, and make-up cosmetics have excellent water repellency and little makeup loss.

On the other hand, water-in-oil type emulsified cosmetics containing silicone oil as an oil component have smooth usability and are excellent in water repellency. In particular, cosmetics containing volatile silicone have good spreadability when applied, and as the volatile silicone oil evaporates as it is extended, the amount of oil remaining on the skin surface is reduced. It is resistant to sweat and has the characteristic that it does not easily lose makeup. Furthermore, when lower alcohols such as ethanol are used in combination, a moderate cooling feeling can be obtained due to heat of vaporization due to their high volatility, and a refreshing feeling can be obtained.

[0004] However, it is very difficult to obtain a stable water-in-oil emulsion system when a lower alcohol such as ethanol is blended. , But not obtained despite the strong demand. Up to now, methods of obtaining a water-in-oil type emulsion cosmetic having good stability include a method of increasing and solidifying waxes, a method of using silica, and a method of emulsifying stably using a clay mineral and a polyoxyalkylene-modified silicone. Methods (JP-A-61-218509, JP-A-64-63031, JP-A-1-180237)
However, in any of the methods, when a lower alcohol such as ethanol is blended to obtain a refreshing feeling, a stable emulsion cannot be obtained, and the storage stability of the emulsion can be obtained. Had a problem. Furthermore, when silicone oil and ethanol were used at the same time, the emulsion stability was remarkably reduced, and the problem of separation became more prominent. For this reason, in the case of a compound containing ethanol or the like, there is a trouble that a consumer must shake and use the compound in general use.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a water-in-oil type emulsion composition which has a refreshing feeling in use, does not stick over time, and has excellent emulsion stability. An object of the present invention is to provide a skin cosmetic containing the same.

[0006]

Under such circumstances, the inventors of the present invention have conducted intensive studies and as a result, together with an oil phase containing silicone oil, a component containing lower alcohol and water,
By using a copolymer containing a certain hydrophilic segment and an organopolysiloxane segment as an emulsifier or an emulsifier and having orientation at the oil-water interface, emulsion stability is obtained despite containing silicone oil and lower alcohol. Excellent water-in-oil emulsion composition is obtained, and when it is applied to skin cosmetics, it has a refreshing feeling of use, and has been found to be a cosmetic that does not become sticky over time, The present invention has been completed.

That is, the present invention provides the following (A):
(B), (C) and (D); (A) an oil phase containing one or more silicone oils; (B) an N-acylalkylenimine having a terminal-blocked end;
Acrylic acid, methacrylic acid, N, N-dimethylacrylamide, dimethylaminoethyl methacrylate, quaternary dimethylaminoethyl methacrylate, methacrylamide, Nt-butylacrylamide, maleic acid, maleic anhydride, maleic anhydride half esters, Crotonic acid, itaconic acid, acrylamide, acrylate alcohols, hydroxyethyl methacrylate, diallyldimethylammonium chloride, vinylpyrrolidone, vinyl ethers, vinylpyridine, vinylimidazole, styrenesulfonate, allyl alcohol, vinyl alcohol, vinylcaprolactam and N-alkylenecarbobetaine A hydrophilic segment derived from one or more selected from the group consisting of A polymer compound having orientation at an oil-water interface and being dissolved or dispersed in water or a lower alcohol; (C) a lower alcohol; (D) water; Content is 15 in all compositions
It is intended to provide a water-in-oil type emulsified composition which is 〜80% by weight and a skin cosmetic containing the same. The present invention also provides
(A) The following (A), (B), (C) and (D): (A) an oil phase containing one or more silicone oils; (B) a silicon atom at the terminal or side chain of the organopolysiloxane segment. At least one of the following general formula (4):

Embedded image Wherein, in the formula, m represents an integer of 1 to 8; a group represented by the formula: is bonded, has orientation at the oil-water interface, and is dissolved or dispersed in water or a lower alcohol. Polymer compound (C) Lower alcohol (D) Contains water, and the content of component (A) is 15
It provides a water-in-oil emulsion composition that is 〜80% by weight.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The oil phase of the component (A) is not particularly limited as long as it is an oil component usually used in cosmetics. For example, petrolatum, lanolin, ceresin, microcrystalline wax, carnauba wax, candelilla wax, cholesterol Solid / semi-solid oil components such as esters, higher fatty acids, higher alcohols; jojoba oil, castor oil, isopropyl myristate, octyldodecyl myristate, trimethylolpropane triisostearate, diisostearyl malate, isostearyl alcohol, Liquid oils such as oleyl alcohol, oleic acid, isostearic acid, myristic acid, stearic acid, squalane, liquid paraffin, ester oil, triglyceride, diglyceride, perfluoropolyether; dimethylpolysiloxane, dimethylcyclo Polysiloxane, methylphenyl polysiloxane, methyl hydrogen polysiloxane,
Examples include silicone oils such as higher fatty acid-modified organopolysiloxane, higher alcohol-modified organopolysiloxane, and trimethylsiloxysilicate. One or more silicone oil-containing silicone oils can be used.

As the silicone oil used for the component (A), volatile dimethylpolysiloxane or dimethylcyclopolysiloxane having a structure represented by the following formula (13) is preferable.

[0010]

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The amount of the silicone oil is preferably 5 to 100% by weight based on the oil content of the component (A). The total amount of the oil containing silicone oil is 1% in the water-in-oil emulsion composition.
5 to 80% by weight.

The polymer compound having an orientation at the oil-water interface as the component (B) is, for example, a viscous liquid or solid copolymer at room temperature and normal pressure, which causes intramolecular and intermolecular cross-links due to bonds other than covalent bonds. It is united. Preferably, a temperature of 20
It is a solid at room temperature and pressure and shows physical properties that do not cause breakage or plastic deformation when the elongation percentage at 0 ° C. and a relative humidity of 65% is in the range of 0 to 15%.

It is desirable that such a high molecular compound is soluble or completely dispersible in water or lower alcohol, that is, that the crosslink is easily cleaved in water or lower alcohol. Here, the lower alcohol is preferably a C ₁ -C ₆ alcohol.

The bond other than the covalent bond includes a bond that is easily cleaved in water or a lower alcohol, such as an ionic bond, a hydrogen bond, a hydrophobic interaction, a dipole-dipole interaction, or a bond by van der Waals attractive force. Although ionic bonding, hydrogen bonding, and dipole-dipole interaction are preferable. The organopolysiloxane of the present invention has one or more kinds of functional groups that cause such a bond.

Preferably, the polymer compound (B) is
The elongation ratio at a temperature of 20 ° C. and a relative humidity of 65% is 0 to 15
% In the range of not breaking or plastic deformation. Generally, it is known that a polymer recovers its original shape when the deformation is small, but hardly recovers when the deformation is large. Such deformation that does not return to its original shape is called plastic deformation. Some hard, brittle polymers break before plastic deformation occurs. Neither of them can maintain the original shape, and is unsuitable as a substance for protecting around water droplets in a water-in-oil emulsion. Therefore,
The above property of the polymer having orientation at the oil-water interface of the present invention is so-called rubber elasticity, orienting around water droplets,
It is extremely important in forming a protective film for water droplets and suppressing the separation of the emulsion.

Whether or not plastic deformation occurs when the elongation percentage is in the range of 0 to 15% can be confirmed by, for example, the following simple experiment. That is, about 0.2 mm thick, 20 mm long,
Prepare a 5mm wide specimen, temperature 20 ℃, relative humidity 65%
While recording the stress-strain curve under the conditions of (1), the crosshead is extended by 3 mm (15%) at a crosshead speed of 20 mm / min, and immediately thereafter, the crosshead is returned to the original position at the same speed. Ten minutes later, it was stretched again, and the stress-strain curve at the second stretching was 1
Following the same trajectory as the first curve indicates that it has completely recovered and no plastic deformation has occurred. In contrast,
When plastic deformation occurs, stress has been applied with a delay in the second elongation since it has already been elongated in the first reciprocating motion, and as a result, the stress-strain curve does not follow the same locus.

The polymer compound (B) is not particularly limited as long as it causes intra- and inter-molecular cross-links by bonds other than covalent bonds. It is necessary to have some kind of polar functional group at the terminal or side chain in the copolymer. then,
When the organopolysiloxane is contained in the copolymer,
Another polymer compound may be used as a linking group between the organopolysiloxane and the polar functional group.

Examples of such polar functional groups include those having a dipole-dipole interaction, such as N-acylalkyleneimine and pyrrolidone, and those generating a hydrogen bond include those having a hydroxyl group such as a saccharide or polyvinyl alcohol. And C ₁ -C ₄ such as poly (meth) acrylamide, polydimethylacrylamide, polydiethylacrylamide, etc.
A mono- or dialkyl (meth) acrylamide polymer,
Poly-N-morpholine (meth) acrylamide, poly-
Those having an amide group such as N-vinylpyrrolidone, poly-N-vinylacetamide, and polyamino acid are exemplified. Carbobetaine, which produces ionic bonds,
Betaine polymers such as sulfobetaine and phosphobetaine and anionic monomers such as (meth) acrylic acid and N,
N-dimethylaminoethyl (meth) acrylate and N,
Examples include amphoteric ionomers such as copolymers of cationic monomers such as N-dimethylaminopropyl (meth) acrylamide and amine oxides.

In the water-in-oil emulsion composition of the present invention, the high molecular compound is formed into a continuous phase (W / O emulsion) by the action of the hydrophilic segment contained in the high molecular compound exhibiting orientation at the oil / water interface. (The external phase = oil phase)
It is possible to prevent coalescence or settling of water droplets. At this time, the polymer compound (B) becomes a protective film having an elastic property with respect to water droplets. In a W / O emulsion containing ethanol and silicone oil, the polymer compound (B) has a protective film with an elastic property, while water droplets coalesce or separate due to sedimentation due to destruction of an interface film, which is likely to occur with a normal emulsifier. As a result, coalescence and sedimentation of water droplets are suppressed, and a stable emulsion can be obtained. In order to obtain a protective film with an elastic property against such water droplets,
The polymer preferably contains a hydrophilic segment exhibiting special properties.

The polymer compound (B) can be oriented at the interface between a water droplet and an oil phase in a water-in-oil emulsion composition to form a protective film for water droplets having low alcohol and silicone resistance. preferable. It is preferable that the polymer compound (B) alone exhibits rubber elasticity at normal temperature and normal pressure, but a compound which does not exhibit rubber elasticity alone constitutes a water-in-oil emulsion composition such as a lower alcohol / silicone oil. The physical properties at normal temperature and pressure alone are not particularly limited as long as they are oriented at the interface between the water droplet and the oil phase when they coexist with the substance to be obtained, and the same effect can be obtained.

As the hydrophilic segment, specifically,
It is selected from the terminal-blocked segments listed above, but is preferably N-acylalkylenimine, acrylic acid, N, N-dimethylacrylamide, dimethylaminoethyl methacrylate, quaternary dimethylaminoethyl methacrylate, vinylpyrrolidone and N- It is derived from one or more selected from alkylenecarbobetaines.

In a polymer compound having a hydrophilic segment and exhibiting interfacial orientation which is dissolved or dispersed in water or a lower alcohol, the ratio of the hydrophilic segment is determined by the ratio of the hydrophilic segment to the segment other than the hydrophilic segment (organopolysiloxane). Weight ratio of 1/50 to 20 /
1, preferably 1/40 to 2/1 and a molecular weight of 5
00 to 500,000, preferably 1,000 to 30
The one with a molecular weight of 000 is preferred for obtaining a stable emulsion.
Further, as the hydrophilic segment derived from N-acylalkyleneimine, a compound represented by the formula (1):

[0023]

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Wherein R ¹ is a hydrogen atom, having 1 to 22 carbon atoms.
Represents an alkyl group, a cycloalkyl group, an aralkyl group, or an aryl group, and n is 2 or 3. A) a poly (N-acylalkyleneimine) segment comprising a repeating unit represented by the formula (1) and an organopolysiloxane segment, wherein at least one of the terminal or side chain silicon atoms of the organopolysiloxane segment is hetero- It is preferable that the poly (N-acylalkyleneimine) segment composed of the repeating unit represented by the formula (1) is bonded via an alkylene group containing an atom. In such a poly (N-acylalkylenimine) -modified silicone, the weight ratio of the segment of the poly (N-acylalkylenimine) to the segment of the organopolysiloxane is 1/50 to 20/1, preferably 1/40 to 20/1.
Those having a 2/1 molecular weight of 500 to 500,000, preferably 1,000 to 300,000 are preferable for obtaining a stable emulsion.

In the formula (1), examples of the cycloalkyl group represented by R ¹ include those having 3 to 6 carbon atoms; examples of the aralkyl group include phenylalkyl and naphthylalkyl; Phenyl, naphthyl, alkyl-substituted phenyl and the like. Examples of the alkylene group containing a heteroatom bonded to at least one silicon atom at the terminal or side chain of the organopolysiloxane segment include a nitrogen atom, an oxygen atom or a sulfur atom having 1 to 3 carbon atoms having 2 to 20 carbon atoms. Examples of the alkylene group include specific examples of the formula (3);

[0026]

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The groups represented by

Preferred examples of the poly (N-acylalkyleneimine) -modified silicone include poly (N-acylalkylenimine).
Formylethyleneimine) modified silicone, poly (N-
Acetylethyleneimine) modified silicone, poly (N-
Propionylethyleneimine-modified silicone, poly (Nn-octanoylethyleneimine) -modified silicone, poly (Nn-dodecanoylethyleneimine) -modified silicone, poly (N-formylpropyleneimine) -modified silicone, poly (N- Acetyl propylene imine)
Modified silicone, poly (N-propionylpropyleneimine) -modified silicone, poly (Nn-octanoylpropyleneimine) -modified silicone, poly (Nn-dodecanoylpropyleneimine) -modified silicone, and the like.

The above poly (N-acylalkylenimine)
The modified silicone can be prepared by a known method (Japanese Unexamined Patent Publication No. Hei 2-27682).
4, JP-A-4-85334, JP-A-4-8
No. 5,335, JP-A-5-112423, JP-A-7-133352, etc.)
For example, it is synthesized by the following method. First, a segment of poly (N-acylalkyleneimine) composed of the repeating unit represented by the formula (1) is represented by the formula (14);

[0030]

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(Wherein R ¹ is a hydrogen atom and has 1 to 22 carbon atoms)
Represents an alkyl group, a cycloalkyl group, an aralkyl group, or an aryl group, and n is 2 or 3. ) Is obtained by ring-opening polymerization of the cyclic imino ether compound represented by The cyclic imino ether compound represented by the formula (14) is a 2-oxazoline or a 2-oxazine as exemplified below. That is, 2-oxazoline, 2-methyl-2-oxazoline, 2-ethyl-2-oxazoline, 2-propyl-2-oxazoline, 2-butyl-2-oxazoline, 2-pentyl-2
-Oxazoline, 2-heptyl-2-oxazoline, 2
-Octyl-2-oxazoline, 2-nonyl-2-oxazoline, 2-decyl-2-oxazoline, 2-undecyl-2-oxazoline, 2-dodecyl-2-oxazoline, 2-tridecyl-2-oxazoline, 2-tetradecyl -2-oxazoline, 2-pentadecyl-2-oxazoline, 2-hexadecyl-2-oxazoline, 2
-Heptadecyl-2-oxazoline, 2-octadecyl-2-oxazoline, 2-nonadecyl-2-oxazoline, 2-eicosyl-2-oxazoline, 2-heneicosyl-2-oxazoline, 2-docosyl-2-oxazoline, 2-benzyl -2-oxazoline, 2-phenyl-2-oxazoline, 2-naphthyl-2-oxazoline, 2-anthryl-2-oxazoline, 2-pyrenyl-2-oxazoline, 2-perylenyl-2-oxazoline, 2-cyclohexyl-2 -Oxazoline, 2-oxazine, 2-methyl-2-oxazine, 2-ethyl-2
-Oxazine, 2-propyl-2-oxazine, 2-butyl-2-oxazine, 2-pentyl-2-oxazine, 2-hexyl-2-oxazine, 2-heptyl-2
-Oxazine, 2-octyl-2-oxazine, 2-nonyl-2-oxazine, 2-decyl-2-oxazine,
2-undecyl-2-oxazine, 2-dodecyl-2-
Oxazine, 2-tridecyl-2-oxazine, 2-tetradecyl-2-oxazine, 2-pentadecyl-2-
Oxazine, 2-hexadecyl-2-oxazine, 2-
Heptadecyl-2-oxazine, 2-octadecyl-2
-Oxazine, 2-nonadecyl-2-oxazine, 2-
Eicosyl-2-oxazine, 2-heneicosyl-2
-Oxazine, 2-docosyl-2-oxazine, 2-benzyl-2-oxazine, 2-phenyl-2-oxazine, 2-naphthyl-2-oxazine, 2-anthryl-
2-oxazine, 2-pyrenyl-2-oxazine, 2-
Perylenyl-2-oxazine, 2-cyclohexyl-2
-Oxazine and the like.

These cyclic imino ethers are, for example, Li
ebigs Ann. Chem. , P996-p100
9 (1974). These compounds may be used alone as a monomer for ring-opening polymerization, or may be used in combination of two or more.

Examples of the polymerization initiator for ring-opening polymerization of the above-mentioned cyclic imino ether include toluenesulfonic acid alkyl ester, dialkyl sulfate ester, trifluoromethanesulfonic acid alkyl ester and alkyl halide, but are not limited thereto. Absent. These initiators can be used alone or in a mixture.

The cyclic iminoether compound represented by the above formula (14) is subjected to ring-opening polymerization using these initiators to obtain a molecular chain of poly (N-acylalkyleneimine). The chains may be homopolymer chains or copolymer chains, which may be random copolymer chains or block copolymer chains.

The above poly (N-acylalkylenimine)
Is preferably 150 or more and 50,000 or less, more preferably 500 or more and 10,000 or less. When the molecular weight is smaller than 150, the properties of poly (N-acylalkylenimine) are lost, and 5
If it is larger than 000, production becomes difficult, which is not preferable.

In the polymer compound (B), those in which the hydrophilic segment is derived from N-acylalkyleneimine have a polymerization activity generated by ring-opening polymerization of a cyclic imino ether compound represented by the formula (14). It can be obtained by reacting a species with an organopolysiloxane having a functional group capable of reacting with the species.

Examples of the functional group capable of reacting with the above-mentioned polymerization active species include a primary, secondary or tertiary amino group, a mercapto group, a hydroxyl group and a carboxylate group. Among them, an amino group or a mercapto group is preferred. is there. The organopolysiloxane containing an amino group or a mercapto group in the molecule preferably has a molecular weight of 300 or more and 400,000 or less, more preferably 800 or more and 250,000 or less. May be provided. When the molecular weight of the organopolysiloxane is less than 300, it is not preferable in obtaining a stable emulsion,
If it is larger than 400,000, it becomes undesirably gel-like and difficult to react. The amino group or mercapto group contained may be introduced at any position of the main chain and the side chain.

The reaction between an organopolysiloxane containing an amino group or a mercapto group and a reactive terminal of poly (N-acylalkyleneimine) obtained by cationic polymerization of a cyclic imino ether can be carried out as follows. .

The initiator is used in combination with a polar solvent, preferably a single solvent such as acetonitrile, valeronitrile, dimethylformamide, dimethylacetamide, chloroform, methylene chloride, ethylene chloride, ethyl acetate, methyl acetate, or other solvents as required. Dissolved in a mixed solvent of 40-1
The temperature is raised to 50 ° C, preferably 60 to 100 ° C. Therein, the cyclic imino ether represented by the general formula (14) is added at once or, if the reaction is intense, dropped to carry out polymerization. The progress of the polymerization can be monitored by quantifying the residual amount of the cyclic imino ether which is a monomer using an analytical instrument such as gas chromatography. Even when the cyclic imino ether is consumed and the polymerization is completed, the active species at the growth terminal maintains the reactivity. Without isolating the polymer,
Subsequently, the polymer solution and an organopolysiloxane containing an amino group or a mercapto group in the molecule are mixed and reacted at 5 to 100 ° C, preferably 20 to 60 ° C. The mixing ratio can be appropriately selected as desired, but the reaction is carried out at a ratio of 0.1 to 1.3 mole equivalent of poly (N-acylalkyleneimine) per mole of amino group or mercapto group in the organopolysiloxane. Is preferred. If it is less than 0.1 molar equivalent, it is difficult to impart the properties of the poly (N-acylalkylenimine) intended in the present invention due to a small modification rate, and if it is more than 1.3 molar equivalent, it is unnecessary.

By the above-described reaction, a block copolymer or a graft polymer having a poly (N-acylalkylenimine) segment as a hydrophilic segment on an organopolysiloxane can be obtained.

Further, as the polymer compound (B), at least one silicon atom at the terminal or side chain of the organopolysiloxane segment has the following general formula (4):

[0042]

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(Wherein, m represents an integer of 1 to 8).

In this copolymer, the number of silicon atoms to which the group represented by the general formula (4) is bonded is 10 to 90% (more preferably 40 to 80%) of the total number of silicon atoms in the molecule, and the weight The average molecular weight is preferably from 1,000 to 500,000 (more preferably from 5,000 to 300,000).

When the weight average molecular weight of the organopolysiloxane containing the group (4) is smaller than 1,000, the emulsion stability becomes poor and the weight average molecular weight becomes 500,000.
Those exceeding the above are difficult to manufacture. When the number of silicon atoms to which the group represented by the general formula (4) is bonded is less than 10% of the total number of silicon atoms in the molecule, sufficient orientation to water droplets is not obtained, and emulsion stability is poor. Becomes 90
%, The water solubility becomes too high, and the emulsifiability becomes difficult to be exhibited.

The organopolysiloxane containing such a group (4) is, for example, a precursor represented by the following general formula (15)
Can be synthesized by a so-called hydrosilylation reaction in which an organohydrogenpolysiloxane represented by the following formula is reacted with an N-alkylenepyrrolidone represented by the following general formula (16). The hydrosilylation reaction is carried out using a halogen-based solvent such as dichloromethane, chloroform, or 1,2-dichloroethane, or an aliphatic ether such as tetrahydrofuran, diisopropyl ether, or dibutyl ether as a reaction solvent at room temperature to 100 ° C. And a transition metal complex such as chloroplatinic acid as a catalyst.

[0047]

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(Wherein R ¹¹ is the same or different and represents a saturated alkyl group having 1 to 22 carbon atoms or a phenyl group;
R ¹² , R ¹³ and R ¹⁴ each represent the same group as R ¹¹ or a group selected from a saturated alkyl group having 1 to 22 carbon atoms or a phenyl group, and p ² represents an integer of 30 to 3,000. shows, q ² is an integer of 60~1,500, m are as defined above)

Japanese Unexamined Patent Publication No. 5-32784 discloses a siloxane compound similar to the above-mentioned organopolysiloxane and a method for producing the same.
Further, there is no mention of an effect of suppressing the separation of a water-in-oil emulsion composition containing (silicone oil).

[0050]

[0051]

[0052]

[0053]

[0054]

Further, at least one silicon atom at the terminal or side chain of the organopolysiloxane segment is linked via an alkylene group containing a hetero atom to the following general formula (2):

[0056]

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(Wherein R ² is a hydrogen atom, having 1 to 22 carbon atoms)
Represents an alkyl group, a cycloalkyl group, an aralkyl group, an aryl group or an alkoxycarbonylalkyl group,
Represents a number of 1 to 5), and a copolymer formed by bonding poly (N-propylenecarbobetaine) composed of repeating units represented by the following formulas can also be used.

In this copolymer, the weight ratio of the organopolysiloxane segment to the poly (N-propylenecarbobetaine) segment is from 98/2 to 40/40.
It is preferably 60 (more preferably 95/5 to 60/40) and the weight average molecular weight is 1,000 to 500,000 (more preferably 5,000 to 300,000). When the weight ratio between the organopolysiloxane segment and the poly (N-propylenecarbobetaine) segment is 9
When it is more than 8/2, when it is less than 40/60, or when the weight average molecular weight is less than 1,000, elasticity does not occur and the emulsion stabilizing action is insufficient, which is not preferable.
On the other hand, those having a weight average molecular weight exceeding 500,000 are difficult to produce.

As the alkylene group containing a hetero atom interposed in the bond between the organopolysiloxane segment and the poly (N-propylenecarbobetaine) segment, a nitrogen atom, an oxygen atom and / or a sulfur atom may be used.
Examples thereof include an alkylene group having 2 to 20 carbon atoms, and specific examples thereof include:

[0060]

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And the like. Examples of the cycloalkyl group represented by R ² include those having 3 to 6 carbon atoms; examples of the aralkyl group include phenylalkyl and naphthylalkyl; and examples of the aryl group include phenyl and
Naphthyl, alkyl-substituted phenyl and the like.

The above copolymer is composed of an organopolysiloxane and the following formula (17):

[0063]

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(Wherein R ² is the same as described above).
First, an organopolysiloxane in which poly (N-propyleneimine) is bonded is produced. This is further reacted with sodium chloroacetate, β-propiolactone, γ-butyrolactone, and ε-caprolactone to produce an organopolysiloxane having poly (N-propylenecarbobetaine) bonded thereto.

As still another production method, the obtained poly (N-propyleneimine) -bonded organopolysiloxane is quaternized with an alkyl halide having 1 to 22 carbon atoms, a cycloalkyl halide, an aryl halide or the like. After the reaction, a hydrolysis reaction of an alkoxycarbonylethyl group or an alkoxycarbonylmethyl group is carried out under basic conditions to produce an organopolysiloxane to which poly (N-propylenecarbobetaine) is bonded.

Here, ring-opening polymerization of a cyclic amine is carried out by a compound such as a Lewis acid, a protonic acid or an alkylating agent, for example, triethyloxonium tetrafluoroborate, benzyl chloride, benzyl bromide, benzyl iodide, methyl bromide, Methyl iodide, ethyl bromide, ethyl iodide, dimethyl sulfate, diethyl sulfate, trifluoromethanesulfonic acid, methyl trifluoromethanesulfonate, ethyl trifluoromethanesulfonate, benzenesulfonic acid, methyl benzenesulfonate, ethylbenzenesulfonate, p -Toluenesulfonic acid, p-toluenemethyl sulfonate, p-
It is carried out using ethyl toluenesulfonate or the like as an initiator. When N-substituted-azetidine is used as the cyclic amine, poly (N-substituted-propylenecarbobetaine) can be obtained.

Solvents used for the ring-opening polymerization of cyclic amines and the production of the copolymer of the present invention include acetates such as ethyl acetate and propyl acetate, and ethers such as diethyl ether, diisopropyl ether, dioxane and tetrahydrofuran. Ketones such as acetone, methyl ethyl ketone, etc .; halogen solvents such as chloroform and methylene chloride; nitrile solvents such as acetonitrile and benzonitrile; aprotic polar such as N, N-dimethylformamide, N, N-dimethylacetamide and dimethyl sulfoxide Solvents can be used.

As the method for connecting the poly (N-propyleneimine) chain and the silicone chain, the same method as the method for connecting the poly (N-acylalkyleneimine) chain and the silicone chain can be used.

JP-B-63-16418 discloses a siloxane having a betaine group similar to the organopolysiloxane to which the above-mentioned poly (N-propylenecarbobetaine) is bonded, and a method for producing the same. Also in the examples, the effect of suppressing the separation of the water-in-oil emulsion composition containing a lower alcohol (or further silicone oil) is not shown. Further, as a polymer compound (B) having an orientation at an oil-water interface, a copolymer comprising a hydrophilic segment and an organopolysiloxane, the copolymer comprising the following three segments (i), (ii) and (iii) Those which are coalesced can also be used because they suppress the separation of a water-in-oil emulsion composition containing a lower alcohol (or furthermore, a silicone oil) and exhibit an emulsion stabilizing effect.

(I) Segment consisting of lipophilic radical polymerizable vinyl polymer 1 to 98% by weight (ii) Segment having hydrophilic polarity 1.5 to 60% by weight (iii) Segment consisting of organopolysiloxane 1-90% by weight

The segments (i), (ii) and (ii)
The copolymer comprising i) is described in JP-A-3-128311, JP-A-3-128312, WO95 / 060.
78, WO95 / 06079, etc., disclose similar copolymers and a method for producing the same, but the field of application of the copolymers relates to hair cosmetics and includes lower alcohols (or silicone oils). It does not relate to the effect of improving the emulsification stability of the water-in-oil type emulsified composition, nor does it relate to a refreshing skin cosmetic comprising these. Further, these copolymers exhibit orientation around water droplets in a water-in-oil emulsion composition containing a lower alcohol (or, further, silicone oil) to form a protective film for the water droplets. There is no description on the effect of suppressing separation and improving the emulsion stability.

The copolymer comprising the segments (i), (ii) and (iii) will be described below with respect to the polymer compound (B).

The segment (ii) having a hydrophilic polarity may be the same as the hydrophilic segment described above.

The segment comprising the lipophilic radical polymerizable vinyl polymer (i) is represented by the following general formula (5):

[0075]

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[Wherein X ¹ is —OH, —NH ₂ , —OM (M represents a cation), —OR ³ , —NHR ^3, and —N (R ³ ) ₂ (R ³ is a group having 1 carbon atom. To 8 linear or branched alkyl groups, N, N-dimethylaminoethyl groups, 2-hydroxyethyl groups,
A methoxyethyl group or a 2-ethoxyethyl group), wherein R ⁴ and R ⁵ are a hydrogen atom, a linear or branched alkyl group having 1 to 8 carbon atoms, a methoxy group, an ethoxy group, -Hydroxyethyl group, 2-methoxyethyl group and ethoxyethyl group].

In the above formula (5), the cations of M include Na ⁺ , K ⁺ , Mg ⁺⁺ , Ca ⁺⁺ , Zn ⁺⁺ , NH ₄ ⁺ ,
Examples thereof include alkyl ammonium, dialkyl ammonium, trialkyl ammonium, and tetraalkyl ammonium.

Representative examples of the monomer constituting the segment (i) include methanol, ethanol, methoxyethanol, 1-propanol, 2-propanol and 1-
Butanol, 2-methyl-1-propanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-
Methyl-1-butanol, 1-methyl-1-butanol, 3-methyl-1-butanol, 1-methyl-1-pentanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol, t -Butanol (2-methyl-
2-propanol), cyclohexanol, neodecanol, 2-ethyl-1-butanol, 2-butanol,
Benzyl alcohol, 2-octanol, 6-methyl-
1-heptanol, 2-ethyl-1-hexanol,
3,5-dimethyl-1-hexanol, 3,5,5-trimethyl-1-hexanol, 1-decanol, 1-dodecanol, 1-hexadecanol, 1-C, such as octadecanol, etc. ₁ -C ₁₈ acrylic acid esters of alcohols, C ₁ -C ₁₈ alcohol methacrylate esters, styrene, polystyrene macromer, vinyl acetate,
Vinyl chloride, vinyl propionate, vinylidene chloride, α
-Methylstyrene, t-butylstyrene, butadiene,
Cyclohexadiene, ethylene, propylene, vinyltoluene, and mixtures thereof. Preferred are n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, methyl methacrylate, t-butyl methacrylate and mixtures thereof.

The segment composed of the organopolysiloxane (iii) includes the following general formula (6):

[0080]

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[Wherein E is a segment (i) or (ii)
Represents a vinyl group which may have a substituent copolymerizable with a segment of Y, Y represents a divalent linking group, R ⁶ represents a hydrogen atom, a lower alkyl group, an aryl group or an alkoxy group; ¹ represents a monovalent siloxane polymer moiety having an average molecular weight of 500 or more, s represents 0 or 1, and t represents an integer of 1 to 3]. The weight average molecular weight of the organopolysiloxane (6) is preferably about 1,000 to about 500,000,
Particularly preferred is from about 5,000 to about 400,000, more preferably from about 5,000 to about 300,000. As the organopolysiloxane (6), the following formulas (7) to (1)
The dimethylpolysiloxane shown in 2) is mentioned.

[0082]

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[Wherein R ⁷ represents a hydrogen atom or an alkyl group, R ⁸ represents a hydrogen atom or a carboxyl group (preferably a hydrogen atom), and R ⁹ represents a hydrogen atom, a methyl group or a carboxymethyl group (preferably A methyl group), R ¹⁰ represents an alkyl group, an alkoxy group, an alkylamino group, an aryl group or a hydroxy group (preferably an alkyl group), q represents an integer of 2 to 6, and p represents an integer of 5 to 700. (Preferably about 250), s represents 0 or 1,
t represents an integer of 1 to 3]

The copolymer comprising the segments (i), (ii) and (iii) contains 1 to 98% by weight of the segment (i).
(Preferably 1 to 90% by weight, more preferably 50 to 9% by weight.
0% by weight), segment (ii) 1.5 to 60% by weight (preferably 7.5 to 50% by weight) and segment (iii)
0.1 to 90% by weight (preferably 0.5 to 90% by weight,
(More preferably 2 to 60% by weight).

In the copolymer comprising the segments (i), (ii) and (iii), the segment (i) is preferably selected from t-butyl acrylate, t-butyl methacrylate and a mixture thereof. This is because such polymers dissolve directly in cyclomethicone solvents without the need for co-solvents.

Particularly preferred copolymers containing segments (i), (ii) and (iii) include the following (weight percents below relate to the amount of reactants added to the polymerization reaction and are not necessarily in the final polymer It is not about the amount of).

Acrylic acid / n-butyl methacrylate /
Polydimethylsiloxane (PDMS) macromer-molecular weight 20,000 (10/70/20 v / v / v) (I) N, N-dimethylacrylamide / isobutyl methacrylate / PDMS macromer-molecular weight 20,000 (2
0/60/20 v / v / v) (II) t-butyl acrylate / t-butyl methacrylate /
PDMS macromer-molecular weight 10,000 (56/24
/ 20 v / v / v) (III) n-butyl acrylate / 2-methoxyethyl acrylate / poly (N-propionylethyleneimine) / polydimethylsiloxane 36/22/40/2 (IV) n-butyl acrylate / 2- Methoxyethyl acrylate / poly (N-propionylethyleneimine) / polydimethylsiloxane 33/22/40/5 (V) n-butyl acrylate / 2-methoxyethyl acrylate / poly (N-propionylethyleneimine) / polydimethylsiloxane 30 0.5 / 22/40 / 7.5
(VI) n-butyl acrylate / 2-methoxyethyl acrylate / poly (N-propionylethyleneimine) / polydimethylsiloxane 28/22/40/10 (VII) n-butyl acrylate / 2-methoxyethyl acrylate / poly (N -Propionylethyleneimine) / polydimethylsiloxane 23/22/40/15 (VIII) n-butyl acrylate / poly (N-propionylethyleneimine) / polydimethylsiloxane 53/40/7
(IX) n-butyl acrylate / 2-ethylhexyl methacrylate / poly (N-propionylethyleneimine) / polydimethylsiloxane 35/20/40/5 (X) n-butyl acrylate / 2-methoxyethyl acrylate / poly (ethylene glycol ) / Polydimethylsiloxane 36/22/40/2 (XI)

The segments (i), (ii) and (ii)
The copolymer containing i) can be synthesized at a time by a radical polymerization method, or each macromonomer can be polymerized in advance and finally made into a copolymer. For example, it can be synthesized by a radical polymerization method as follows.

The general principles are well understood [eg Odian; "Principles of polymerization", 2nd edition,
John Wiley & Sons, 1
981, 179, 318]. The desired monomers are all introduced into the reactor with sufficient amounts of mutual solvent to ensure that the viscosity of the reaction is reasonable when the reaction is complete. Typical monomer concentrations are from about 20 to about 50% by weight. It is desirable to remove undesired terminators, especially oxygen. This is done by purging or evacuation with an inert gas such as argon or nitrogen. An initiator is introduced, but if a thermal initiator is used, the reaction is brought to the temperature required for initiation. On the other hand, redox or radical initiation can also be applied if desired. The polymerization is allowed to proceed for hours to days as needed to achieve high levels of conversion. The solvent is then removed, usually by evaporation or by precipitating the polymer with the addition of a non-solvent. The polymer is further purified if necessary.

The polymer compound (B) having an orientation at the oil-water interface emulsifies a component containing an oil phase containing silicone oil, a lower alcohol and water to form a stable water-in-oil emulsion composition. The blending amount of the polymer having orientation at the oil-water interface is preferably 0.05 to 10% by weight, more preferably 0.1 to 8% by weight, and still more preferably 0.1 to 5% by weight.
It is. Within this range, a stable water-in-oil emulsion composition can be obtained, the viscosity of the oil phase, which is a continuous phase, does not increase, and no stickiness occurs during use, and the feeling of use is good.

The lower alcohol which is the component (C) of the present invention is not particularly limited, but may be any one having at least one hydroxyl group in the molecule and having a small molecular weight and being water-soluble. For example, ethyl alcohol, propyl alcohol, isopropyl Alcohol and the like. The amount of the lower alcohol is preferably 1 to 40% by weight, more preferably 2 to 30% by weight, more preferably 5 to 20% by weight, in the water-in-oil emulsion composition and the skin cosmetic containing the same. It is preferable because it does not decrease stability while maintaining a refreshing feeling and a refreshing feeling.

The water used in the component (D) of the present invention is not particularly limited, but purified water such as pure water and ion-exchanged water is preferable. The amount of water is from 1 to 90% by weight in the water-in-oil emulsion composition and skin cosmetics containing it.
In particular, it is preferably 3 to 85% by weight, more preferably 5 to 80% by weight.

The water-in-oil emulsion composition and the skin cosmetic containing the same according to the present invention have a ratio of the external phase (oil phase) to the internal phase (aqueous phase) of external phase: internal phase = 10: 1 to 1: It is preferably 10 and particularly preferably 8: 1 to 1: 8. Also,
The mixing ratio of water and lower alcohol blended in the inner phase is 50:
1-1: 5 is preferable, and 10: 1 to 1: 3 is particularly preferable.

The water-in-oil emulsified composition of the present invention and the skin cosmetic containing the same may contain, in addition to the above-mentioned essential components, components which are added to ordinary cosmetics, if necessary. For example, humectants such as propylene glycol, dipropylene glycol, 1,3-butylene glycol, glycerin, maltitol, sorbitol, polyethylene glycol, sodium hyaluronate, and pyrrolidone carboxylate as an aqueous phase component, and intercellular lipids (ceramide, etc.) And, coloring materials such as inorganic pigments and organic pigments, cationic activators, anionic activators, surfactants such as nonionic activators, agents such as vitamin E, vitamin E acetate, astringents, antioxidants, Preservatives, flavors and citric acid, sodium citrate, lactic acid, sodium lactate, dibasic sodium phosphate, etc.
A pH adjuster, an inorganic salt such as magnesium sulfate and sodium chloride or a thickener such as an organically modified montmorillonite, an ultraviolet absorber and the like are appropriately blended into the water-in-oil emulsion composition of the present invention and a skin cosmetic containing the same. be able to.

The skin cosmetic of the present invention can be produced according to a usual method, and can be a cream, an emulsion, a foundation, a lipstick and the like.

[0096]

Industrial Applicability The water-in-oil emulsion composition and the skin cosmetic containing the same according to the present invention show excellent emulsification stability, are excellent in refreshing feeling and refreshing feeling, and have no stickiness.

[0097]

EXAMPLES Next, the present invention will be further described with reference to examples, but the present invention is not limited thereto. still,
The percentages in the examples are on a weight basis unless otherwise specified. In this synthesis example, the weight average molecular weight was determined by gel permeation type liquid chromatography using chloroform as a developing solvent, and the value is a value in terms of polystyrene.

Synthesis Example 1 (Synthesis of poly (N-acetylethyleneimine) -modified silicone) 13.03 g (0.070 mol) of methyl-p-toluenesulfonate (methyl tosylate), 2-methyl-2
A mixture of 70 g (0.82 mol) of oxazoline, 10 ml of acetonitrile, and 30 ml of chloroform was refluxed for 6 hours to synthesize a poly (N-acetylethyleneimine) terminal reactive polymer (molecular weight: 1,000). To this reaction solution, polydimethylsiloxane substituted with 3-aminopropyl at both ends (FM3311, molecular weight 1,000, manufactured by Chisso Corporation).
A solution prepared by dissolving 31.8 g in 50 ml of chloroform was added thereto, and reacted at 55 ° C. for 24 hours. By distilling off the solvent under reduced pressure, a block copolymer (molecular weight: 3,000) having poly (N-acetylethyleneimine) chains at both ends of polydimethylsiloxane was obtained. The copolymer was a pale yellow brittle solid (yield 110.2 g,
Yield 96%).

Synthesis Example 2 (Synthesis of poly (Nn-dodecanoylpropyleneimine) -modified silicone) 1.45 g (7.8 × 10 ⁻³ mol) of methyl tosylate,
7.8 g of 2-n-undecyl-2-oxazine (0.0
33 mol) and 10 ml of dimethylacetamide in 1
While maintaining the temperature at 00 ° C. for 24 hours, poly (Nn-dodecanoylpropyleneimine) (molecular weight: 1,000) was synthesized. This reaction solution was mixed with a polydimethylsiloxane substituted with 3-aminopropyl at both ends (FM3325, manufactured by Chisso, molecular weight 1).
A solution of 38.9 g of (0000) dissolved in 50 ml of chloroform was added and refluxed for 72 hours. Then, it was reprecipitated with methanol, and the residue was dried under reduced pressure. The obtained polymer was a yellow viscous liquid and had a molecular weight of 12,000 (yield 45.7 g, 95%).

Synthesis Example 3 (Synthesis of poly (N-acetylethyleneimine) -modified silicone) 3.26 g (0.018 mol) of methyl tosylate, 2-
A mixture of 70 g (0.82 mol) of methyl-2-oxazoline, 10 ml of acetonitrile and 40 ml of chloroform was added to 6
After refluxing for an hour, poly (N-acetylethyleneimine) (molecular weight: 4,000) was synthesized. In this reaction solution, 3
Polydimethylsiloxane substituted with an aminopropyl group (KF865, manufactured by Shin-Etsu Chemical Co., Ltd., amine equivalent 4,40)
0, molecular weight 2,000) 63.6 g of chloroform 15
The solution dissolved in 0 ml was added and reacted at 55 ° C. for 24 hours. By evaporating the solvent under reduced pressure, a graft polymer (molecular weight: 6,000) having a poly (N-acetylethyleneimine) chain attached to polydimethylsiloxane and a molecular weight of 2,0
A mixture of 100 silicones formed. This polymer was a pale yellow brittle solid (134.1 g, yield 9).
8%).

Synthesis Example 4 Synthesis of (N-acetylethyleneimine). (Nn-octanoylethyleneimine) random copolymer-modified silicone 1.86 g (0.01 mol) of methyl tosylate, 2-n
-Heptyl-2-oxazoline 10 g (0.059 mol), 2-methyl-2-oxazoline 10 g (0.11 mol)
A mixture of (74 mol) and 20 ml of chloroform was refluxed for 6 hours to synthesize a (N-acetylethyleneimine). (Nn-octanoylethyleneimine) random copolymer (molecular weight: 2,000). Polydimethylsiloxane having a 2-aminoethylaminopropyl group substituted on the side chain (KF857, manufactured by Shin-Etsu Chemical Co., Ltd., amine equivalent 830, viscosity 7)
0cs (25 ° C)) 43.34 g in chloroform 150 g
Put the above random copolymer solution in the solution dissolved in,
Refluxed for 10 hours. The solvent was distilled off under reduced pressure to obtain a copolymer (molecular weight: 19,000) in which poly (N-acylethyleneimine) was grafted to polydimethylsiloxane. This copolymer was a pale yellow viscous liquid (yield 64.5 g, 99%).

Synthesis Example 5 (Synthesis of poly (N-formylpropyleneimine) -modified silicone) 13.03 g (0.070 mol) of methyl tosylate, 2
A mixture of 70 g (0.82 mol) of oxazine, 10 ml of acetonitrile and 30 ml of chloroform was refluxed for 6 hours,
A terminally reactive polymer of poly (N-formylpropyleneimine) (molecular weight 1,000) was synthesized. This reaction solution was mixed with polydimethylsiloxane having a 3-mercaptopropyl group substituted on the side chain (X-22-980, manufactured by Shin-Etsu Chemical Co., Ltd.).
1.7% sulfur content, 150 cs viscosity (25 ° C) 50
g in 100 ml of chloroform,
The reaction was carried out at a temperature of 60 ° C for 3 hours and then at 60 ° C for 24 hours. By evaporating the solvent under reduced pressure, a graft polymer (molecular weight: 6,200) having poly (N-formylpropyleneimine) chain attached to polydimethylsiloxane was obtained. This copolymer was a pale yellow viscous liquid (yield: 129.0 g, 97%).

Synthesis Example 6 (Synthesis of Amino-Modified Silicone Containing Tertiary Amino Group in Side Chain (Precursor of Synthesis Example 7)) 6.00 g (0.031 mol) of N, N-dimethylaminopropylmethyldimethoxysilane 1.46 g of water (0.
(081 mol) at 60 ° C. for 5 hours, and the resulting methanol and water are removed under reduced pressure at 60 ° C. and 2-5 mmHg. After the temperature was raised to 80 ° C., 228 g (0.769 mol) of octamethylcyclotetrasiloxane, 1.92 g (1.18 × 10 ⁻² mol) of hexamethyldisiloxane and 0.90 g of polymerization catalyst (tetramethylammonium hydroxide 0 .12 g (1.32 × 10 ⁻³ mol) contained; tetramethylammonium hydroxide pentahydrate dissolved in octamethylcyclotetrasiloxane and toluene, reacted at 80 ° C. for 12 hours, and dried in vacuum at 80 ° C./2 mmHg The tetramethylammonium hydroxide content was determined by a hydrochloric acid titration method), and the mixture was heated under a nitrogen atmosphere for 72 hours. 1
By removing the oligomer at 20 ° C. under a vacuum of 2 to 5 mmHg, an amino-modified silicone having a tertiary amino group in the side chain represented by the following formula was synthesized. The product was a clear, colorless oil (225 g). The weight average molecular weight is 22,
000. The amine equivalent was determined by a hydrochloric acid titration method to be 7,200.

[0104]

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Synthesis Example 7 (Synthesis of poly (N-propionylethyleneimine) -modified silicone) 2.36 g (0.0153 mol) of diethyl sulfate and 30.3 g (0.306 mol) of 2-ethyl-2-oxazoline
Was dissolved in 43 ml of chloroform and heated under reflux in a nitrogen atmosphere for 5 hours to obtain poly (N-propionylethyleneimine).
Was synthesized (molecular weight: 2,000). A solution of 100 g of the tertiary amino-modified silicone synthesized in Synthesis Example 6 (0.0139 mol as an amino group) in 270 ml of chloroform was added all at once, and the mixture was heated under reflux for 16 hours. The reaction mixture was concentrated under reduced pressure, and a graft copolymer (molecular weight: 28,90) having N-propionylethyleneimine chain attached to polydimethylsiloxane represented by the following formula:
0) was obtained. This polymer was a pale yellow rubbery solid (yield 129 g, 97%).

[0106]

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Synthesis Example 8 (Synthesis of poly (N-propionylethyleneimine) -modified silicone) 3.55 g (0.0230 mol) of diethyl sulfate and 27.4 g (0.276 mol) of 2-ethyl-2-oxazoline
Was dissolved in 60 g of dehydrated ethyl acetate, and the solution was dissolved in a nitrogen atmosphere.
The mixture was heated under reflux for an hour to synthesize a poly (N-propionylethyleneimine) terminal-reactive polymer (molecular weight 1,200). Here, a side chain primary aminopropyl-modified polydimethylsiloxane (molecular weight 110,000, amine equivalent 2
(0,800) 400 g (0.0192 mol based on amino group) of a 50% ethyl acetate solution was added all at once, and the mixture was refluxed for 8 hours. The reaction mixture was concentrated under reduced pressure to obtain a graft copolymer (molecular weight 115,000) in which N-propionylethyleneimine chain was attached to polydimethylsiloxane. This copolymer was a pale yellow rubbery solid (yield 4
27g, 99% yield).

Synthesis Example 9 (Synthesis of poly (N-propionylethyleneimine) -modified silicone) 3.77 g (0.0244 mol) of diethyl sulfate and 48.4 g (0.488 mol) of 2-ethyl-2-oxazoline
Was dissolved in 107 g of dehydrated chloroform, and the mixture was heated under reflux in a nitrogen atmosphere for 5 hours to synthesize a poly (N-propionylethyleneimine) terminal-reactive polymer (molecular weight: 2,000). Here, a 50% ethyl acetate solution of 400 g (0.0407 mol in terms of amino group) of side chain primary aminopropyl-modified polydimethylsiloxane (molecular weight 110,000, amine equivalent 9,840) was added all at once, and the mixture was added for 13 hours. Heated to reflux. The reaction mixture was concentrated under reduced pressure to obtain a graft copolymer (molecular weight: 137,000) having N-propionylethyleneimine chain attached to polydimethylsiloxane. The obtained copolymer was a pale yellow rubbery solid (yield 444).
g, 98% yield).

Synthesis Example 10 (Synthesis of alkylpyrrolidone-modified silicone) 500 g of methyl hydrogen polysiloxane (SiH
2.91 mol, weight average molecular weight 100,000,
2.0 g of a 5% isopropyl alcohol solution of chloroplatinic acid was added to the SiH equivalent 172), and N- (3-propenyl) pyrrolidone 382 was added thereto while stirring under a nitrogen atmosphere.
g (3.06 mol) was added dropwise at such a rate that the temperature in the system did not exceed 60 ° C. After the completion of the dropping, the inside of the system is kept at 65 ° C.
Stirring was continued for another 3 hours to return to room temperature. To this, 3,530 g of ethanol was added to make a homogeneous solution, 10 g of activated carbon powder was further added, and the mixture was stirred at room temperature for 30 minutes, and then the activated carbon was filtered off. The obtained solution is concentrated under reduced pressure, ethanol and unreacted N- (3-propenyl) pyrrolidone are distilled off, and 847 g (yield 98%) of methylpolysiloxane having an alkylpyrrolidone group in a side chain is colorless. Obtained as a clear rubbery solid. The weight average molecular weight was 155,000. In the FT-IR spectrum, no Si-H stretching vibration absorption (2125 cm ^-1 ) was observed.

Synthetic Example 11 (Synthesis of Silicone Containing Residue Derived from Sugar) The amine equivalent was 996 and the weight average molecular weight was 108,000.
Of γ-aminopropyl-modified dimethylpolysiloxane (0.201 mol in terms of amino group), 39.3 g (0.221 mol) of δ-gluconolactone, and 200 g of methanol were mixed and stirred vigorously under a nitrogen atmosphere. While heating, the mixture was refluxed for 8 hours. The solution was diluted three times with methanol and added dropwise to 10 liters of vigorously stirred water at room temperature. The stirring was stopped, the precipitate was collected by filtration, washed with water, and dried under reduced pressure to obtain 204 g (86% yield) of a saccharide-derived residue-containing dimethylpolysiloxane as a colorless transparent elastic solid.
As a result of neutralization titration with hydrochloric acid using methanol as a solvent, it was found that no amino group remained. The content of the silicone segment was 86%.

Synthesis Example 12 (Synthesis of carbobetaine-modified silicone) 30.6 g (0.198 mol) of diethyl sulfate and 1- (2
-Carboethoxyethyl) azetidine 1498.2 g
(9.53 mol) was dissolved in 3058 g of dehydrated ethyl acetate, and the mixture was heated under reflux in a nitrogen atmosphere for 15 hours to synthesize a terminal-reactive poly (N-propylene imine). Here, 800 g of side chain primary aminopropyl-modified polydimethylsiloxane (molecular weight 110,000, amine equivalent 4,840)
A 50% ethyl acetate solution (0.165 mol based on amino group) was added all at once, and the mixture was refluxed for 12 hours. The reaction mixture was concentrated under reduced pressure to give an N-propyleneimine-dimethylsiloxane copolymer as a pale yellow solid (2,212 g, yield 95
%). The resulting reaction mixture was dissolved in 5,000 g of diethyl ether, and β-propiolactone 824 was dissolved.
g (11.4 mol) was added at room temperature, and reacted at room temperature for 24 hours. The obtained solution was concentrated under reduced pressure to obtain an N-propylenecarbobetaine-dimethylsiloxane copolymer as a pale yellow solid.

Synthesis Example 13 [Synthesis of Poly (2-ethyl-2-oxazoline) Macromonomer End-Capped with Vinylbenzyl (Precursor of Synthesis Example 14)] 50 g of 2-ethyl-2-oxazoline (0.5044 mol) ), Meta-paravinylbenzyl chloride 0.381
6g (0.0025 mol) [manufactured by Aldrich Chemical Co., Ltd.], 0.562 g (0.0037 mol) of sodium iodide, 0.06 g (0.00023 mol) of N, N'-diphenyl-p-phenylenediamine, acetonitrile 5
0 ml of the mixture was refluxed for 16 hours at 90 ° C. and the reaction was terminated by adding 100 ml of dichloromethane. The mixed solution containing the synthesized product was filtered, further precipitated in 800 ml of ether, filtered out with suction, and dried under vacuum to obtain a poly (2-ethyl-2-oxazoline) macromonomer ( (40 g, 90% yield).

Synthesis Example 14 [n-butyl acrylate /
Synthesis of 2-methoxyethyl acrylate / poly (N-propionylethyleneimine) / polydimethylsiloxane copolymer (36/22/40/5)] 3.6 g (0.0281 mol) of n-butyl acrylate, 2-methoxy 2.2 g of ethyl acrylate (0.
0169 mol), dimethylpolysiloxane (Mw = 10,
000 (manufactured by Chisso), 0.2 g (0.00002 mol) of the poly (2-ethyl-2-oxazoline) macromonomer prepared in Synthesis Example 13, 4.0 g (0.001 mol), and 90 ml of acetone as an initiator. As azobisisobutyronitrile (AIBN) 0.015 g (0.0
001 mol), and refluxed for 24 hours.
Was added to stop the synthesis. The reaction mixture is poured into a Teflon coat pan and placed in a vacuum drier to dry the acetone at room temperature. The obtained synthesized product was dissolved in ethanol, the insolubles were filtered, the filtrate was taken out, and the ethanol was distilled off under reduced pressure to obtain [n-butyl acrylate / 2-methoxyethyl acrylate / poly (N-propionylethyleneimine) / Polydimethylsiloxane copolymer].
This copolymer was a rubbery solid (yield 9.0 g).

Synthesis Example 15 [Acrylic acid / n-butyl methacrylate / polydimethylsiloxane copolymer (10
Synthesis of / 70/20)] Polymer I: 10 parts of acrylic acid, 70 parts of n-butyl methacrylate and 20 parts of 20K PDMS macromer were placed in a flask. Add enough ethyl acetate to obtain a final monomer concentration of 40%. The initiator benzoyl peroxide was added to a level of 0.1% by weight relative to the amount of monomer. The vessel was evacuated and refilled with nitrogen. Heated to 60 ° C. and maintained this temperature under stirring for 48 hours. The reaction was terminated by cooling to room temperature, and the reaction mixture was poured into a Teflon coat pan and placed in a vacuum oven to dry out ethyl acetate, and acrylic acid / n-butyl methacrylate / polydimethylsiloxane (= 10/70/20) ) (Molecular weight 100,000).

Examples 1 to 15 and Comparative Examples 1 to 5 Water-in-oil emulsion compositions (skin cosmetics) having the compositions shown in Tables 1 and 2 were produced by the following method, and the emulsion storage stability, refreshing feeling and The non-stickiness was evaluated. The results are shown in Tables 1 and 2.

(Production method) Components (1) to (14) are mixed. The mixture of (15) to (17) is added to this with stirring slowly over 30 minutes, and further emulsified by stirring with a homomixer for 10 minutes. This was defoamed and filled in a polyethylene container to prepare an emulsion.

(Evaluation method) (1) Emulsion storage stability: A polyethylene container containing 100 ml of each emulsion was filled with about 70 g, and the emulsion was stored at 5 ° C. and room temperature (20 to 25).
° C) and storage at 40 ° C for one month, the stability of each emulsion was judged from the appearance according to the following criteria. A: No change. ：: Unevenness occurred on the surface. Δ: Separation of liquid within 1 mm on the surface. ×: Completely separated (1 mm or more).

(2) Refreshing feeling: Each of the water-in-oil type emulsified cosmetics was applied to the face by 15 expert panelists, evaluated according to the following criteria, and judged by the average score. Bad ... Score 1 Somewhat bad ... Score 2 Normal ... Score 3 Somewhat good ... Score 4 Good ... Score 5

(3) Non-stickiness: Evaluated according to the following criteria in the same manner as in the above (2) Refreshing feeling, and judged by the average score. Bad ... Score 1 Somewhat bad ... Score 2 Normal ... Score 3 Somewhat good ... Score 4 Good ... Score 5

(Criteria) Average score from 4.5 to 5.0: 以上 Average score from 3.5 to less than 4.5: ○ Average score from 2.5 to less than 3.5: △ Average score from 1.5 to 2 Less than 0.5: × Average score of 1.0 or more and less than 1.5: XX

[0121]

[Table 1]

[0122]

[Table 2]

Tables 1 and 2 show that the water-in-oil emulsified cosmetics (Examples 1 to 15) of the present invention comprising a polymer having orientation at the oil-water interface and a lower alcohol were blended at each temperature condition. Was excellent in storage stability, and in use feeling, was excellent in refreshing feeling and was non-sticky. On the other hand, the water-in-oil type emulsified cosmetics containing no polymer having orientation at the oil-water interface (Comparative Examples 1 to 3) were excellent in feeling of use and were non-sticky, but storage-stable. It was inferior in sex. In addition, those without ethanol as a lower alcohol (Comparative Examples 4 and 5) tend to have better stability, especially those with a polymer having orientation at the oil-water interface (Comparative Example 5). Was excellent in stability, however, was inferior in the feeling of use and was sticky.

Example 16 (Cream emulsified cosmetic)

[Table 3] (Components) (1) Dimethylpolysiloxane (viscosity 2 cs) 10% (2) Decamethylcyclopentasiloxane 10% (3) Perfluoropolyether (FOMBLIN HC-04 manufactured by Asimont) 5% (4) Squalane 5% (5) Lanolin 1% (6) Poly (N-propionylethyleneimine) -modified silicone (Synthesis Example 7) 3% (7) Purified water balance (8) 95% ethyl alcohol 15% (9) 1, 3-butylene glycol 5% (10) Sodium hyaluronate 0.1% 100%

The above components (1) to (6) are mixed. The mixture of (7) to (10) is added to this with stirring slowly over 30 minutes, and further emulsified by stirring with a homomixer for 10 minutes. This was defoamed and filled in a polyethylene container to prepare a cream emulsion cosmetic.

Example 17 (Cream foundation)

TABLE 4 (Component) (1) isoparaffins _{(C 10 ~C 12) 15%} (2) Octamethylcyclotetrasiloxane 8% (3) dimethylpolysiloxane (viscosity 6 cs) 7% (4) Cetanol 1% (5 ) Diisostearyl malate 6% (6) Zinc distearate 1% (7) Monoisostearyl glyceryl ether 1% (8) Dimethylsiloxane / methylpolyoxyethylene siloxane copolymer 1% (9) Poly (N-propionyl) Ethyleneimine) modified silicone (Synthesis Example 8) 2% (10) Silicone-treated fine particle titanium oxide ^{* 1} (manufactured by Teica) 5% (11) Siliconized spherical silica ^{* 1} 1% (12) Silicone-treated titanium oxide ^* 15 % (13) silicone-treated iron oxide (red, yellow, black) ^* 1 3% (14) glycerin 3% (15) 95% ethanol 3% (16) methylcarbamoyl Paraben 0.1% (17) Water Balance 100% (* 1) those by coating a 2% by methylhydrogenpolysiloxane

The components (1) to (9) are heated and mixed at 80 ° C. Separately, the components (10) to (13) are mixed with a Henschel mixer, and this is added to (1) to (8), which have been mixed in advance, and dispersed and mixed with a stirrer. The mixture of (14) to (16) heated to 40 ° C. is added to this with stirring slowly over 30 minutes, and further stirred for 10 minutes with a homomixer to emulsify. The emulsion was cooled to room temperature while slowly stirring, defoamed and filled into a bottle to prepare a creamy foundation.

Example 18 (Sunscreen emulsion)

(Table 5) (Components) (1) Octamethylcyclotetrasiloxane 3% (2) Decamethylcyclopentasiloxane 10% (3) Dimethylpolysiloxane (viscosity 1 cs) 3% (4) Octyldodecyl myristate 8% (5 ) Stearic acid 0.5% (6) Octyl methoxycinnamate 2% (7) Poly (N-propionylethyleneimine) -modified silicone (Synthesis Example 8) 5% (8) Silicone-treated fine particle titanium oxide ^{* 2} (manufactured by Teica Corporation) 3% (9) Silicone-treated fine zinc oxide ^{* 3} (2% fine zinc white treated by Sakai Chemical Co., Ltd.) 5% (10) Nylon powder 2% (11) 95% ethanol 8% (12) Sodium citrate 0.5% (13) glycerin 3% (14) 1% magnesium sulfate (15) water Balance 100% (* 2) 5% coated with methylhydrogenpolysiloxane Thing was

The components (1) to (10) are heated and mixed at 70 ° C. In addition, components (11) to (15) are separately added to 4
The mixture that has been heated and mixed at 0 ° C. is added over 30 minutes while slowly stirring, and further stirred for 10 minutes with a homomixer to emulsify. The emulsion was cooled to room temperature with slow stirring, defoamed and filled into a bottle to prepare a sunscreen emulsion.

Example 19 (Liquid foundation)

(Ingredients) (1) Octamethylcyclotetrasiloxane 15% (2) Dimethylpolysiloxane (viscosity 2 cs) 8% (3) Octyl methoxycinnamate 2% (4) 12-Hydroxystearic acid 1% (5 ) Octyldodecyl myristate 7% (6) Dimethylsiloxane / methylpolyoxyethylene siloxane copolymer 3% (7) Poly (N-propionylethyleneimine) modified silicone (Synthesis example 9) 0.5% (8) Silicone treatment Fine particle titanium oxide ^{* 1} (manufactured by Teica) 7% (9) Spherical silicone resin powder (Tospearl 120 manufactured by Toshiba Silicone Co., Ltd.) 2% (10) Lecithin treated mica titanium ^{* 4} 1% (11) Siliconized titanium oxide ^{* 1} 5% (12) silicone-treated iron oxide (red, yellow, black) ^* 1 3% (13) 95% ethanol 15% (14) 1,3-Bed Glycol 2% (15) 1% of magnesium sulfate (16) Water Balance 100% (* 1) those by coating a 2% by methylhydrogenpolysiloxane (* 4) those by coating a 5% by soybean lecithin

The components (1) to (7) are heated and mixed at 70 ° C. Separately, the components (8) to (12) are mixed with a Henschel mixer, and this is added to (1) to (7), which have been mixed in advance, and dispersed and mixed with a stirrer. The mixture of (13) to (16) heated to 40 ° C. is added to this with stirring slowly over 30 minutes, and further stirred for 10 minutes with a homomixer to emulsify. The emulsion was cooled to room temperature with slow stirring, defoamed and filled into a bottle to prepare a liquid foundation.

Example 20 (Hand cream)

[Table 7] (Components) (1) Dimethylpolysiloxane (viscosity 1 cs) 10% (2) Decamethylcyclopentasiloxane 10% (3) Dimethylsiloxane / methyl stearoxysiloxane copolymer 3% (4) Solid paraffin 1% (5) Cetanol 1% (6) Lanolin 5% (7) Poly (N-propionylethyleneimine) modified silicone (Synthesis Example 9) 3% (8) 95% ethyl alcohol 5% (9) 1,3- Butylene glycol 5% (10) Sodium hyaluronate 0.1% (11) Purified water Remaining 100%

The components (1) to (7) are heated and mixed at 70 ° C. The mixture of (8) to (11) is added to this with stirring slowly over 30 minutes, and further stirred for 10 minutes with a homomixer to emulsify. This was defoamed and filled in a polyethylene container to prepare a hand cream.

Example 21 (Cream emulsified cosmetic)

(Components) (1) Dimethylpolysiloxane (viscosity 2cs) 10% (2) Decamethylcyclopentasiloxane 10% (3) Dimethylpolysiloxane (viscosity 6cs) 5% (4) Squalane 5% (5) Lanolin 1% (6) Copolymer (Synthesis Example 10) 3% (7) Remaining purified water (8) 95% ethyl alcohol 15% (9) 1,3-butylene glycol 5% (10) Sodium hyaluronate 0 .1% 100%

The components (1) to (5) are mixed. The mixture of (6) to (10) is added to this with slow stirring over 30 minutes, and further emulsified by stirring with a homomixer for 10 minutes. This was defoamed and filled in a polyethylene container to prepare a cream emulsion cosmetic.

Example 22 (Cream emulsified cosmetic) The copolymer of component (6) in Example 21 (Synthesis Example 1)
A cream emulsion cosmetic was prepared in the same manner as in Example 21 except that the copolymer (Synthesis Example 11) was used instead of 0).

Example 23 (Cream emulsified cosmetic) In Example 21, a copolymer of component (6) (Synthesis Example 1)
A cream emulsion cosmetic was prepared in the same manner as in Example 21 except that the copolymer (Synthesis Example 12) was used instead of 0).

Example 24 (Cream emulsified cosmetic) The copolymer of component (6) in Example 21 (Synthesis Example 1)
A cream emulsion cosmetic was prepared in the same manner as in Example 21 except that the copolymer (Synthesis Example 14) was used instead of 0).

Example 25 (Emulsion cosmetic cream) In Example 21, a copolymer of component (6) (Synthesis Example 1)
A cream emulsion cosmetic was prepared in the same manner as in Example 21 except that the copolymer (Synthesis Example 15) was used instead of 0).

The skin cosmetics comprising the water-in-oil emulsion compositions of Examples 16 to 25 were excellent in storage stability, excellent in feeling in use, and free of stickiness.

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Taku Oda 1334 Minato 1334 Minato 1334 Kao Corporation Wakayama City Wakayama Prefecture Wakayama Pref. Katsuhiko Fuji 1334 Minato, Wakayama City, Wakayama Pref. Kao Corporation Laboratory (56) References JP-A-5-238917 (JP, A) JP-A-2-167212 (JP, A) JP-A-63-250311 (JP, A) JP-A-5-112423 (JP, A) JP-A-3-79655 (JP, A) JP-A-9-183710 (JP, A) JP-A-2-22939 (JP, A) 287509 (JP, A) JP-A-9-208447 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61K 7/00 A61K 7/02 A61K 7/42 A61K 7/48

Claims (16)

(57) [Claims] 1. The following (A), (B), (C) and (D): (A) an oil phase containing one or more silicone oils; (B) a terminal-blocked N-acyl Alkyleneimine,
Acrylic acid, methacrylic acid, N, N-dimethylacrylamide, dimethylaminoethyl methacrylate, quaternary dimethylaminoethyl methacrylate, methacrylamide, Nt-butylacrylamide, maleic acid, maleic anhydride, maleic anhydride half esters, Crotonic acid, itaconic acid, acrylamide, acrylate alcohols, hydroxyethyl methacrylate, diallyldimethylammonium chloride, vinylpyrrolidone, vinyl ethers, vinylpyridine, vinylimidazole, styrenesulfonate, allyl alcohol, vinyl alcohol, vinylcaprolactam and N-alkylenecarbobetaine A hydrophilic segment derived from one or more selected from the group consisting of A polymer compound having orientation at an oil-water interface and being dissolved or dispersed in water or a lower alcohol; (C) a lower alcohol; (D) water; Content is 15 in all compositions
A water-in-oil type emulsion composition that is 〜80% by weight. 2. The component (B) causes intramolecular and intermolecular crosslinks due to bonds other than covalent bonds, and breaks or undergoes plastic deformation at an elongation of 0 to 15% at a temperature of 20 ° C. and a relative humidity of 65%. The water-in-oil emulsion composition according to claim 1, which is a polymer compound that is a solid at ordinary temperature and normal pressure and has physical properties that do not occur. 3. The weight ratio of the hydrophilic segment to the segment other than the hydrophilic segment of the polymer compound (B) is 1 /
The water-in-oil emulsion composition according to claim 1 or 2, wherein the weight-average molecular weight of the high molecular compound is from 500 to 500,000. 4. A segment in which the hydrophilic segment of the polymer compound (B) is bonded to at least one terminal or side chain silicon atom of the organopolysiloxane segment via an alkylene group containing a hetero atom, The following general formula (1): (Wherein, R ¹ represents a hydrogen atom, an alkyl group having 1 to 22 carbon atoms, a cycloalkyl group, an aralkyl group or an aryl group, and n represents a number of 2 or 3). The water-in-oil emulsion composition according to any one of claims 1 to 3, which is (N-acylalkyleneimine). 5. A segment wherein the hydrophilic segment of the polymer compound (B) is bonded to at least one of the terminal or side chain silicon atoms of the organopolysiloxane segment via an alkylene group containing a hetero atom, The following general formula (2): (Wherein, R ² represents a hydrogen atom, an alkyl group having 1 to 22 carbon atoms, a cycloalkyl group, an aralkyl group, an aryl group or an alkoxycarbonylalkyl group, and r represents a number of 1 to 5). Poly (N-
The water-in-oil emulsion composition according to any one of claims 1 to 3, which is propylene carbobetaine). 6. An alkylene group containing a hetero atom bonded to at least one silicon atom at the terminal or side chain of the segment of the organopolysiloxane is represented by the formula (3): The water-in-oil emulsion composition according to claim 4, which is selected from the groups represented by the following formulae. 7. The following (A), (B), (C) and (D): (A) an oil phase containing one or more silicone oils; (B) an end or side of an organopolysiloxane segment. At least one of the silicon atoms in the chain has the following general formula (4): Wherein, in the formula, m represents an integer of 1 to 8; a group represented by the formula: is bonded, has orientation at the oil-water interface, and is dissolved or dispersed in water or a lower alcohol. Polymer compound (C) Lower alcohol (D) Contains water, and the content of component (A) is 15
A water-in-oil type emulsion composition that is 〜80% by weight. 8. The polymer compound (B) is such that the number of silicon atoms to which the group represented by the general formula (4) is bonded is 10 to 90% of the total number of silicon atoms in the molecule, and the weight average molecular weight is 1,000.
The water-in-oil type emulsion composition according to claim 7, which has a viscosity of from 500 to 500,000. 9. The weight ratio of the organopolysiloxane segment of the polymer compound (B) to the poly (N-propylenecarbobetaine) segment is from 98/2 to 40/60, and the weight average molecular weight is from 1,000 to 1,000. The water-in-oil type emulsion composition according to claim 5, which is 500,000. 10. The component (B) comprises the following segments (i), (ii) and (iii): (i) a segment comprising a lipophilic radically polymerizable vinyl polymer 1 to 98% by weight (ii) hydrophilic The water-in-oil emulsion composition according to claim 1 or 2, which is a copolymer comprising a segment having an ionic polarity of 1.5 to 60% by weight and (iii) a segment comprising an organopolysiloxane of 0.1 to 90% by weight. 11. The segment (i) is represented by the following general formula (5): [In the formula, X ¹ represents —OH, —NH ₂ , —OM (M represents a cation), —OR ³ , —NHR _3, and —N (R ³ ) ₂ (where R ³ represents 1 to 8 carbon atoms) straight or branched chain alkyl group, N, N-dimethylaminoethyl group, 2-hydroxyethyl group, a group selected from 2-methoxy represents an ethyl group or a 2-ethoxyethyl group), R ⁴ and R ⁵ Represents a hydrogen atom, a linear or branched alkyl group having 1 to 8 carbon atoms, a methoxy group, an ethoxy group, a 2-hydroxyethyl group, a 2-methoxyethyl group and an ethoxyethyl group]. 11. The water-in-oil emulsion composition according to claim 10, wherein the composition is at least one kind. 12. segment (i) is, C ₁ -C ₁₈ acrylate esters of an alcohol, C ₁ -C ₁₈ methacrylate esters of alcohols, styrene, polystyrene macromer, vinyl acetate, vinyl chloride, vinyl propionate, The water-in-oil emulsion composition according to claim 10, wherein the composition is at least one selected from vinylidene chloride, α-methylstyrene, t-butylstyrene, butadiene, cyclohexadiene, ethylene, propylene, and vinyltoluene. 13. The segment (iii) is represented by the following general formula (6): [Wherein, E represents a vinyl group which may have a substituent copolymerizable with the macromonomer of the segment (i) or (ii), Y represents a divalent linking group, and R ⁶ represents hydrogen. An atom, a lower alkyl group, an aryl group or an alkoxy group;
¹ represents a monovalent siloxane polymer moiety having an average molecular weight of 500 or more, s represents 0 or 1, and t represents an integer of 1 to 3].
0. A water-in-oil emulsion composition according to item 0. 14. A segment (iii) represented by the following general formulas (7) to (12): (Wherein, R ⁷ represents a hydrogen atom or an alkyl group, R ⁸ represents a hydrogen atom or a carboxyl group, R ⁹ represents a hydrogen atom,
Represents a methyl group or a carboxymethyl group, R ¹⁰ represents an alkyl group, an alkoxy group, an alkylamino group, an aryl group or a hydroxy group, q represents an integer of 2 to 6, p represents an integer of 5 to 700, s represents 0 or 1, and t is 1
The water-in-oil emulsion composition according to claim 10, comprising a silicone-containing macromer having a weight-average molecular weight of 1,000 to 500,000 based on dimethylpolysiloxane selected from the group consisting of an integer of from 1 to 3). 15. Component (A) is 15 to 80% by weight, component (B) is 0.05 to 10% by weight, and component (C) is 1 to 40% by weight.
The water-in-oil emulsion composition according to any one of claims 1 to 14, which contains 0.1% by weight. 16. A skin cosmetic containing the water-in-oil emulsion composition according to claim 1. Description: