WO2015052754A1 - Cosmetic composition - Google Patents

Abstract

This cosmetic composition contains the following components (A), (B), and (C), and has a viscosity at 25°C of at least 1.5 Pa·s: (A) a copolymer containing constituent units represented by general formulae (1), (2), and (3) each at a predetermined fraction; (B) at least one oily component selected from a ceramide, a higher fatty acid, a higher alcohol, a glycerol monoalkyl ether, a sorbitan distearate ester, and a glycerol monostearate ester having at least 14 carbon atoms; and (C) water.

Description

Cosmetic composition

The present invention relates to a cosmetic composition.

In recent years, cosmetics having higher safety and superior hypoallergenicity have been strongly demanded, and it is desired to limit the use of surfactants from this viewpoint. For this reason, cosmetic compositions have been developed that do not use low-molecular surfactants or reduce the amount used, and technologies using various polymer compounds have been proposed as possible to achieve this. Has been.
On the other hand, a cosmetic composition having a higher moisturizing effect is desired in response to an increase in health awareness, particularly dry skin awareness.

As a skin care preparation that exhibits a high moisturizing effect, a cosmetic composition using a layered α-gel is expected (for example, Non-Patent Document 1). A composition having a layered α-gel structure is a gel having a translucent to white appearance obtained by combining water and various amphiphiles. From structural analysis, a hydrated solid of an amphiphile is obtained. It is known to have a structure in which lamellar layers overlap with water in between. Most of the stratum corneum intercellular lipids present in the outermost stratum corneum of skin also have this layered α-gel structure, which prevents the invasion of foreign substances from the outside and moisture transpiration from the inside. At the same time as suppressing, it itself retains moisture, thereby having the function of maintaining the flexibility and smooth appearance of the skin. Therefore, if such a layered α-gel can be replenished from the outside as a cosmetic, it can maintain a moist feeling of the skin by containing a large amount of water during drying, like the stratum corneum intercellular lipid.

Non-Patent Document 1 discloses that a high moisture content can be created by charge repulsion of an ionic hydrophilic group of a low-molecular-weight surfactant with a specific solid fat composition, and high moisture retention due to a continuous and high moisture α-gel. It is described that the effect and the sustainability of the moisturizing effect can be obtained.
Patent Document 1 discloses (A) sphingosine, pseudosphingosine, salts thereof, compounds selected from anionic surfactants and cationic surfactants, (B) ceramides, (C) glycerin monofatty acid esters, (D) higher grades. It is described that an emulsion composition containing an alcohol and (E) water and having an α-gel structure is excellent in storage stability, suppresses precipitation of crystals, and has a high moisturizing effect.
Patent Document 2 discloses an α- containing (A) a higher alcohol, (B) a long-chain acyl sulfonate anionic surfactant, (C) ascorbic acid-2-glucoside, and (D) water. It is described that the gel-like composition having a gel has good stability in the temperature range from high temperature to low temperature and good usability.

J.Soc.Cosmet.Chem.Jpn. 46 (1) 25-32 (2012)

JP 2007-22997 A Japanese Patent Laid-Open No. 2005-132808

The present invention relates to a cosmetic composition containing the following components (A), (B) and (C), and having a viscosity at 25 ° C. of 1.5 Pa · s or more.
(A) the structural unit (a) represented by the general formula (1), the structural unit (b) represented by the general formula (2), and the structural unit (c) represented by the general formula (3),
In the copolymer, the structural unit (a) is contained in an amount of 1% by mass to 23% by mass,
A copolymer having a mass ratio of the structural unit (c) to the structural unit (b) (structural unit (c) / structural unit (b)) of 0.19 to 2.2;

 

 

(Wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms; R ¹⁰ represents an alkylene group having 2 to 4 carbon atoms, R ¹¹ represents a linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms, X ¹ represents OM or NHC (CH ₃ ) ₂ CH ₂ SO ₂ M (M represents a hydrogen atom or a cation group), X ² represents NR ¹² R ¹³ (R ¹² and R ¹³ each have 1 or 2 carbon atoms which may have a hydrogen atom or a hydroxy group) Represents an alkyl group, except that R ¹² and R ¹³ are simultaneously a hydrogen atom) or OR ¹⁴ (R ¹⁴ represents a C 2 or C 3 alkyl group having a hydroxy group), and X ³ represents oxygen Represents an atom or NH, and n represents an integer of 0 to 3.)
(B) an oil component containing at least one selected from the following (B1) to (B5):
(B1) one or more selected from glycerin monofatty acid esters having 14 or more carbon atoms and sorbitan difatty acid esters having 14 or more carbon atoms,
(B2) glycerol monoalkyl ether having 14 or more carbon atoms,
(B3) a higher alcohol having 14 or more carbon atoms,
(B4) a higher fatty acid having 14 or more carbon atoms,
(B5) Ceramides,
(C) Water.

Ratio of (A) copolymer content, (B1) content, and (B2), (B3), (B4) and (B5) total content [(A) / (B1) / In the relationship of {(B2) + (B3) + (B4) + (B5)}], it is a diagram showing a range in which the viscosity of the composition is 2 Pa · s or more. Ratio of (A) copolymer content, (B1) content, and (B2), (B3), (B4) and (B5) total content [(A) / (B1) / In the relationship of {(B2) + (B3) + (B4) + (B5)}], it is a diagram showing a range in which the viscosity of the composition is 5 Pa · s or more. Ratio of (A) copolymer content, (B1) content, and (B2), (B3), (B4) and (B5) total content [(A) / (B1) / In the relationship of {(B2) + (B3) + (B4) + (B5)}], it is a diagram showing a range in which the viscosity of the composition is 10 Pa · s or more.

Detailed Description of the Invention

In order to obtain a stable layered α-gel structure in which a large amount of water is held between lamella layers, in the composition obtained by combining an oil component and a surfactant, the composition should be adjusted so that the curvature of the structure becomes flat. It is important to optimize. On the other hand, from the viewpoint of hypoallergenicity, it is known to use an amphiphilic polymer instead of a surfactant. However, in the existing amphiphilic polymer, a higher-order structure is formed when aligned with an oil component. The curvature of the film cannot be kept flat, and the layered α-gel structure collapses. For this reason, a great deal of trial and error is required to design an amphiphilic polymer capable of maintaining a layered α-gel structure.
Furthermore, in response to the recent increase in health consciousness, especially dry skin consciousness, a cosmetic composition having higher moisture retention and usability has been demanded.

Under such circumstances, a low-molecular-weight surfactant is not used, or a cosmetic composition in which the amount used is reduced and a layered α-gel is formed using an amphiphilic polymer compound is low. It is expected that cosmetics that are irritating and excellent in moisture retention and usability can be realized in a wide range of dosage forms. However, none of the cosmetic compositions described in the above-mentioned patent documents can satisfy the recent high required characteristics, and there is still room for improvement.
Therefore, the present invention relates to a cosmetic composition having a layered α-gel structure and excellent in moisture retention and usability.

The inventors include a specific structural unit (a) that expresses electrostatic repulsion, a copolymer that includes the specific structural unit (b) and the structural unit (c) in a specific ratio, a specific oil component, By using it in combination with water, it has an α-gel structure, has a uniform appearance, excellent shape retention, and has a moist and familiar feeling when used, and a finger that has good makeup It has been found that a material composition can be obtained.

The cosmetic composition of the present invention has an α-gel structure, has a uniform appearance, is excellent in shape retention, and has a moist and familiar feeling when used. Appropriate amount can be taken, that is, it is excellent in finger dexterity.

Hereinafter, the present invention will be described in detail.
(A) Copolymer:
The copolymer of component (A) used in the present invention is composed of the structural unit (a) represented by the general formula (1), the structural unit (b) represented by the general formula (2), and the general formula (3). The structural unit (c) represented is included.

 

 

(Wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms; R ¹⁰ represents an alkylene group having 2 to 4 carbon atoms, R ¹¹ represents a linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms, X ¹ represents OM or NHC (CH ₃ ) ₂ CH ₂ SO ₂ M (M represents a hydrogen atom or a cation group), X ² represents NR ¹² R ¹³ (R ¹² and R ¹³ each have 1 or 2 carbon atoms which may have a hydrogen atom or a hydroxy group) Represents an alkyl group, except that R ¹² and R ¹³ are simultaneously a hydrogen atom) or OR ¹⁴ (R ¹⁴ represents a C 2 or C 3 alkyl group having a hydroxy group), and X ³ represents oxygen Represents an atom or NH, and n represents an integer of 0 to 3.)

Since the structural unit (a) represented by the general formula (1) has a structure represented by the above formula (1), it expresses electrostatic repulsion, and is represented by the above general formula (2). The structural unit (b) and the structural unit (c) represented by the general formula (3) can exhibit a good hydrophilicity / hydrophobicity balance by having a specific mass ratio. By using such a copolymer together with a specific oil component and water, a cosmetic composition forming a layered α-gel can be obtained.

In cosmetics, in order to maintain a stable high water content layered α-gel structure that retains a large amount of free water between lamella layers (water that is retained between lamella structure layers but not bound by lamella structure components). The following are important for this: That is, the oily component and the copolymer are aligned to form an α crystal to form a layered α-gel structure, which forms a planar structure when the copolymer is aligned with the oily component at the interface. It means that the copolymer and the oil component are arranged in a layered form without being spherical, and has an action of expanding the lamellar layer by electrostatic repulsion.
It is considered that the reason why the highly water-containing layered α-gel can be prepared by the copolymer of the component (A) used in the present invention is as follows. The copolymer of the component (A) used in the present invention expresses an appropriate electrostatic repulsion force by containing the structural unit (a) in a specific amount. In addition, when the structural unit (c) and the structural unit (b) have a specific mass ratio, an appropriate hydrophilicity / hydrophobicity balance and structure-forming property are exhibited. Because of these characteristics, the lamellar layer can be expanded while easily taking a layered structure without disturbing the curvature, so that it is considered that a highly water-containing layered α-gel can be prepared. The α-gel can also have a spherical structure, but in this case, free water protrudes from the lamellar layer and becomes a continuous phase, so that the ability to retain water tends to be insufficient. On the other hand, when α-gel has a layered structure, it can retain a large amount of water between lamella layers, and each lamella layer can function as a barrier layer even after time to maintain water continuously. Can do. Therefore, the layered α-gel is superior to the spherical α-gel in terms of moisture retention as a highly water-containing α-gel.

The structural unit (a) represented by the general formula (1) is a structural unit derived by polymerizing a monomer represented by the following general formula (4) (hereinafter also referred to as monomer (a)). In general formula (1) and general formula (4), R ¹ , R ² , R ³ and X ¹ are all synonymous.

 

 

In formula (1) and formula (4), R ¹ , R ² and R ³ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and X ¹ is OM or NHC (CH ₃ ) _2. CH ₂ SO ₂ M (M represents a hydrogen atom or a cation group). In Formula (1) and Formula (4), R ¹ and R ² are preferably hydrogen atoms. R ³ is preferably a hydrogen atom or a methyl group, and more preferably a methyl group. X ¹ is preferably NHC (CH ₃ ) ₂ CH ₂ SO ₂ M, and M is preferably a hydrogen atom.

Specific examples of the monomer represented by the general formula (4) include acrylic acid, methacrylic acid, crotonic acid, and 2-acrylamido-2-methylpropanesulfonic acid. Of these, acrylic acid, methacrylic acid, crotonic acid, and 2-acrylamido-2-methylpropanesulfonic acid are preferred from the viewpoint of developing an electrostatic repulsion suitable for formation of α-gel, and acrylic acid and methacrylic acid. 2-acrylamido-2-methylpropanesulfonic acid is more preferable, and 2-acrylamido-2-methylpropanesulfonic acid is more preferable.

The structural unit represented by the general formula (1) may be derived by using a monomer other than the monomer represented by the general formula (4) and appropriately introducing a functional group after polymerization. The monomer other than the monomer represented by the general formula (4) includes, for example, a monomer having an ester group or a nitrile group. The monomer is hydrolyzed to generate a carboxyl group and represented by the general formula (1). It can be a structural unit.

The content of the structural unit (a) in the copolymer of the component (A) is 1% by mass in the copolymer from the viewpoint that a layered α-gel can be prepared by expressing an appropriate electrostatic repulsion force. It is above, Preferably it is 2 mass% or more, More preferably, it is 3 mass% or more, More preferably, it is 4 mass% or more. The content of the structural unit (a) in the copolymer of the component (A) is 23% by mass or less, preferably 20% by mass in the copolymer from the viewpoint of enabling preparation of a layered α-gel. % Or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and still more preferably 8% by mass or less. The content of the structural unit (a) in the copolymer of the component (A) is 1% by mass or more and 23% by mass or less, preferably 2 to 20% by mass, more preferably 3 to 15%. % By mass, more preferably 4 to 10% by mass, and still more preferably 4 to 8% by mass.

The structural unit (b) represented by the general formula (2) is a structural unit derived by polymerizing a monomer represented by the following general formula (5) (hereinafter also referred to as monomer (b)). In the general formulas (2) and (5), R ⁴ , R ⁵ , R ⁶ and X ² are all synonymous.

 

 

In the formulas (2) and (5), R ⁴ , R ⁵ and R ⁶ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and X ² represents NR ¹² R ¹³ (R ¹² and R ¹³ represents a hydrogen atom or an alkyl group having 1 or 2 carbon atoms which may have a hydroxy group, except that R ¹² and R ¹³ are simultaneously a hydrogen atom) or OR ¹⁴ (R ¹⁴ is a hydroxy group). An alkyl group having 2 or 3 carbon atoms having a group). In formulas (2) and (5), R ⁴ , R ⁵ and R ⁶ are preferably hydrogen atoms.
As the monomer (b), specifically, dimethyl acrylamide ^{(X 2 = NR 12 R 13} : R 12 and R ¹³ are methyl), hydroxyethyl acrylamide ^{(X 2 = NR 12 R 13} : R 12 is a hydrogen atom, R ¹³ is hydroxyethyl group), hydroxyethyl acrylate ^{(X 2 = OR 14: R} 14 is hydroxyethyl group), hydroxyethyl methacrylate ^{(X 2 = OR 14: R} 14 is hydroxyethyl group), hydroxypropyl acrylate (X ² = OR ¹⁴ : R ¹⁴ is a hydroxypropyl group), and hydroxypropyl methacrylate (X ² = OR ¹⁴ : R ¹⁴ is a hydroxypropyl group). Of these, from the viewpoint of forming a highly viscous layered α-gel, hydroxypropyl methacrylate and dimethylacrylamide are preferred, and dimethylacrylamide is more preferred.

In addition, the structural unit represented by the general formula (2) may be derived by using a monomer other than the monomer represented by the general formula (5) and appropriately introducing a functional group after polymerization.

The content of the structural unit (b) in the copolymer of the component (A) is preferably 30% by mass or more, more preferably 35% by mass or more, from the viewpoint of preparing the layered α-gel. Preferably it is 40 mass% or more, More preferably, it is 45 mass% or more. From the same viewpoint, the content of the structural unit (b) in the copolymer of the component (A) is preferably 80% by mass or less, more preferably 75% by mass or less, and further preferably 70% by mass. Or less, more preferably 65% by mass or less, and still more preferably 60% by mass or less. Further, the content of the structural unit (b) in the copolymer of the component (A) is preferably 30% by mass or more and 80% by mass or less, more preferably 35 to 75% by mass, and still more preferably 40%. It is ˜70% by mass, still more preferably 45 to 65% by mass, and still more preferably 45 to 60% by mass.

The structural unit (c) represented by the general formula (3) is a structural unit derived by polymerizing a monomer represented by the following general formula (6) (hereinafter also referred to as monomer (c)). In formulas (3) and (6), R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ , X ² and n are all synonymous.

 

 

In the formulas (3) and (6), R ⁷ , R ⁸ and R ⁹ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and R ¹⁰ is an alkylene group having 2 to 4 carbon atoms. R ¹¹ represents a linear or branched alkyl or alkenyl group having 1 to 30 carbon atoms. X ² represents an oxygen atom or NH, and n represents an integer of 0 to 3. In Formula (3) and Formula (6), R ⁷ and R ⁸ are preferably hydrogen atoms, R ⁹ is preferably a hydrogen atom or a methyl group, more preferably a methyl group, and X ² is preferably an oxygen atom. n is preferably 2 or less, more preferably 1 or less, and still more preferably 0 from the viewpoint of enabling the preparation of a layered α-gel. R ¹¹ preferably has 12 or more carbon atoms, more preferably 14 or more, still more preferably 16 or more, and still more preferably 18 or more, from the viewpoint of enabling the preparation of a layered α-gel. Preferably it is 24 or less, More preferably, it is 22 or less. R ¹¹ is preferably an alkyl group or alkenyl group having 4 to 22 carbon atoms.

  Among these, the structural unit (c) is preferably a structural unit represented by the following formula (3 ′), and the structural unit is derived from a monomer represented by the following formula (6 ′).

(In the formula, R ⁷ , R ⁸ , R ⁹ and R ¹¹ have the same meaning as described above.)

Specific examples of the structural unit (c) include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, and (meth) acrylic acid. n-hexyl, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-decyl (meth) acrylate, lauryl (meth) acrylate, myristyl (meth) acrylate, (meth) acrylic acid Examples include palmityl, stearyl (meth) acrylate, behenyl (meth) acrylate, and the like. Among them, the structural unit (c) is butyl (meth) acrylate, lauryl (meth) acrylate, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, (meth) acrylic acid. Behenyl is preferable, and butyl (meth) acrylate, stearyl (meth) acrylate, and behenyl (meth) acrylate are more preferable.

The structural unit represented by the general formula (3) may be derived by using a monomer other than the monomer represented by the general formula (6) and appropriately introducing a functional group after polymerization.

The content of the structural unit (c) in the copolymer of the component (A) is preferably 15% by mass or more, more preferably 20% by mass or more from the viewpoint of enabling the preparation of the layered α-gel. Yes, more preferably 25% by mass or more, still more preferably 30% by mass or more, and still more preferably 35% by mass or more. From the same viewpoint, the content of the structural unit (c) in the copolymer of the component (A) is preferably 65% by mass or less, more preferably 60% by mass or less, and further preferably 55% by mass. Or more preferably 50% by mass or less. The content of the structural unit (c) in the copolymer of the component (A) is preferably 15% by mass or more and 65% by mass or less, more preferably 20 to 60% by mass, and further preferably 25%. It is -55% by mass, more preferably 30-50% by mass, and still more preferably 35-50% by mass.

In the copolymer of the component (A), the mass ratio ((c) / (b)) between the content of the structural unit (b) and the content of the structural unit (c) is the viewpoint for preparing the layered α-gel. To 0.19 or more, preferably 0.25 or more, more preferably 0.3 or more, still more preferably 0.4 or more, and even more preferably 0.6 or more, Still more preferably, it is 0.7 or more, and still more preferably 0.85 or more. From the same viewpoint, the mass ratio ((c) / (b)) between the content of the structural unit (b) and the content of the structural unit (c) is 2.2 or less, preferably 1.6. Or less, more preferably 1.4 or less, still more preferably 1.2 or less, still more preferably 1 or less, still more preferably 0.98 or less, and even more preferably 0. .95 or less.
In the component (A), the mass ratio ((c) / (b)) between the content of the structural unit (b) and the content of the structural unit (c) is the viewpoint of preparing the layered α-gel, and From the viewpoint of maintaining a good balance between hydrophilicity and hydrophobicity of the copolymer, it is 0.19 to 2.2, preferably 0.25 to 1.6, more preferably 0.3 to 1. .4, more preferably 0.4 to 1.2, still more preferably 0.6 to 1.0, still more preferably 0.7 to 0.98, and even more preferably. Is 0.85 to 0.95.

In the copolymer of the component (A), the mass ratio of the content of the structural unit (a) and the total content of the structural unit (b) and the structural unit (c) ({(b) + (c)} / ( a)) is preferably 4 or more, more preferably 5 or more, still more preferably 9 or more, from the viewpoint of enabling the preparation of a layered α-gel by expressing a suitable electrostatic repulsion force. More preferably, it is 12 or more. The mass ratio ({(b) + (c)} / (a)) between the content of the structural unit (a) and the total content of the structural unit (b) and the structural unit (c) is a good hydrophilic / hydrophobic balance. From the viewpoint of maintaining the value, it is preferably 50 or less, more preferably 25 or less. The mass ratio ({(b) + (c)} / (a)) of the content of the structural unit (a) and the total content of the structural unit (b) and the structural unit (c) is preferably 4 -50, more preferably 5-25, still more preferably 9-25, and even more preferably 12-25.

In the copolymer of the component (A), the structural unit (a), the structural unit (b), and the structural unit (c) can be used alone or in combination of two or more.
Further, the total content of the structural unit (a), the structural unit (b) and the structural unit (c) in the copolymer of the component (A) is preferably 70% by mass from the viewpoint of preparing the layered α-gel. Or more, more preferably 80% by mass or more, further preferably 90% by mass or more, still more preferably 95% by mass or more, still more preferably substantially 100% by mass, and still more. Preferably it is 100 mass%.
In addition, substantially 100 mass% is meant to include the case where structural units other than the structural unit (a), the structural unit (b), and the structural unit (c) are inevitably mixed in the copolymer. .

The copolymer of the component (A) may contain a structural unit other than the structural unit (a), the structural unit (b), and the structural unit (c) as long as the effects of the present invention are not impaired.
Further, it may be crosslinked as long as the effects of the present invention are not impaired, but from the viewpoint of preparing a layered α-gel, it is preferably not crosslinked.

The copolymer of component (A) used in the present invention can be obtained by a known synthesis method. For example, it can be obtained by polymerizing a monomer component containing the monomer (a), monomer (b) and monomer (c) by a solution polymerization method.

Examples of the solvent used for the solution polymerization include aromatic hydrocarbons (toluene, xylene, etc.), lower alcohols (ethanol, isopropanol, etc.), ketones (acetone, methyl ethyl ketone), ethers (tetrahydrofuran, diethylene glycol dimethyl ether, etc.), etc. The organic solvent can be used. The amount of solvent (by mass) is preferably 0.5 to 10 times the total amount of monomers.

As the polymerization initiator, known radical polymerization initiators can be used, and examples thereof include azo polymerization initiators, hydroperoxides, dialkyl peroxides, diacyl peroxides, and ketone peroxides. The amount of the polymerization initiator is preferably 0.01 to 5 parts by mass, more preferably 0.01 to 3 parts by mass, and still more preferably 0.01 to 1 part by mass with respect to 100 parts by mass of the total amount of monomers.
The polymerization reaction is preferably performed in a temperature range of 60 to 180 ° C. under a nitrogen stream, and the reaction time is preferably 0.5 to 20 hours.

The weight average molecular weight of the component (A) polymer used in the present invention is preferably from 5,000 to 1,000,000, more preferably from 10,000 to 200,000, from the viewpoint of enabling preparation of a layered α-gel. The weight average molecular weight is a value measured by GPC (gel permeation chromatography), and details of the measurement conditions are as shown in the examples.

The content of the copolymer of component (A) has a layered α-gel structure, a uniform appearance, excellent shape retention, and can be easily taken with a finger during use (finger From the viewpoint of making it possible to do this, it is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and further preferably 0.7% by mass in the cosmetic composition. % Or more, more preferably 0.9 mass% or more. Further, from the viewpoint of suppressing stickiness to the skin when the cosmetic composition is applied, it is preferably 10% by mass or less, more preferably 5% by mass or less, and further preferably 3% by mass or less. Even more preferably, it is 2% by mass or less.
The content of component (A) is preferably 0.1 to 10% by mass, more preferably 0.5 to 5% by mass, and still more preferably 0.7 to 10% by mass in the cosmetic composition. 3% by mass, and still more preferably 0.9-2% by mass.

(B) Oil component:
The oil component of the component (B) used in the present invention contains at least one selected from the following (B1) to (B5). These oil components shown in the following (B1) to (B5) are solid or semi-solid at 25 ° C., and the cosmetic composition of the present invention is a good lamellar α-gel, that is, a highly viscous lamellar α-gel. Form.
(B1) one or more selected from glycerin monofatty acid esters having 14 or more carbon atoms and sorbitan difatty acid esters having 14 or more carbon atoms,
(B2) glycerol monoalkyl ether having 14 or more carbon atoms,
(B3) a higher alcohol having 14 or more carbon atoms,
(B4) a higher fatty acid having 14 or more carbon atoms,
(B5) Ceramides

(B1) is at least one selected from glycerin monofatty acid esters having 14 or more carbon atoms and sorbitan difatty acid esters having 14 or more carbon atoms. Here, the number of carbons means the number of carbons of the alkyl group or alkenyl group of the fatty acid constituting the fatty acid of glycerin monofatty acid ester and sorbitan difatty acid ester, respectively. Examples of the glycerol monofatty acid ester having 14 or more carbon atoms include glycerol monomyristic acid ester, glycerol monopalmitate ester, glycerol monostearate ester, glycerol monobehenate ester, glycerol monooleate ester, etc. Examples of the sorbitan difatty acid ester include sorbitan distearate and the like. The number of carbon atoms of the fatty acid is preferably 14 to 22, more preferably 16 to 22, and further preferably 18 to 22 from the viewpoint of forming a layered α-gel structure in order to maintain a stable α-gel structure.
(B1) is preferably a glycerin monofatty acid ester having 14 or more carbon atoms from the same viewpoint, and the carbon number is preferably 14 to 22, more preferably 16 to 22, and more preferably 18 to 22 from the same viewpoint. Further preferred.

(B2) is glycerol monoalkyl ether having 14 or more carbon atoms, and examples thereof include glycerol monostereal ether. The number of carbon atoms of the alkyl group is preferably 14 to 22, more preferably 16 to 22, and further preferably 18 to 22 from the viewpoint of forming a layered α-gel structure in order to maintain a stable α-gel structure.

(B3) is a higher alcohol having 14 or more carbon atoms, and examples include myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, and oleyl alcohol. Here, the carbon number means the carbon number of the alkyl group or alkenyl group constituting the alcohol. The number of carbon atoms of the alkyl group or alkenyl group is preferably 14 to 22, more preferably 16 to 22, and further preferably 18 to 22 from the viewpoint of forming a layered α-gel structure in order to maintain a stable α-gel structure. preferable.

(B4) is a higher fatty acid having 14 or more carbon atoms, and examples thereof include myristic acid, palmitic acid, stearic acid, and behenic acid. Here, the carbon number means the carbon number of the alkyl group or alkenyl group constituting the fatty acid. The number of carbon atoms of the alkyl group or alkenyl group is preferably 14 to 22, more preferably 16 to 22, and further preferably 18 to 22 from the viewpoint of forming a layered α-gel structure in order to maintain a stable α-gel structure. preferable.

(B5) is a ceramide. In the present invention, ceramides include ceramide and its derivatives. As a ceramide and its derivative (s), what is represented by General formula (7) is mentioned, for example.

 

 

(Wherein R ¹² represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group or hydrogen atom having 4 to 30 carbon atoms, which may be substituted by a hydroxyl group, a carbonyl group or an amino group. Z represents a methylene group, a methine group or an oxygen atom; X ¹¹ , X ¹² and X ¹³ each independently represent a hydrogen atom, a hydroxyl group or an acetoxy group, and X ¹⁴ represents a hydrogen atom, an acetyl group or a glyceryl group; or shown, together with the adjacent oxygen atom, forms an oxo group (provided that when Z is a methine group, either X ¹¹ and X ¹² is a hydrogen atom, is .X ¹⁴ to the other is not present X ¹³ is not present when forming an oxo group.); R ¹³ and R ¹⁴ each independently represent a hydrogen atom, a hydroxyl group, a hydroxymethyl group or an acetoxymethyl group; R ¹⁵ is a hydroxyl group, a carbonyl A linear or branched or cyclic saturated or unsaturated carbon atom having 5 to 60 carbon atoms, which may have an ether bond, ester bond or amide bond in the main chain, which may be substituted by a group or amino group Represents a hydrogen group; R ¹⁶ represents a hydrogen atom, or may have a substituent selected from a hydroxyl group, a hydroxyalkoxy group, an alkoxy group and an acetoxy group, and is a straight chain or branched chain having 1 to 30 carbon atoms in total A saturated or unsaturated hydrocarbon group of the chain (provided that when R ¹² is a hydrogen atom and Z is an oxygen atom, R ¹⁶ is a hydrocarbon group having 10 to 30 carbon atoms in total, and R ¹² is a hydrocarbon group; When R ¹⁶ is a hydrocarbon group having 1 to 8 carbon atoms in total; the broken line portion may indicate an unsaturated bond)

In the formula, R ¹² is a straight chain having 4 to 30 carbon atoms, preferably 7 to 22 carbon atoms optionally substituted with a hydroxyl group, which may be substituted with a hydroxyl group, a carbonyl group or an amino group, A branched or cyclic saturated or unsaturated hydrocarbon group or a hydrogen atom.
Z represents a methylene group, a methine group or an oxygen atom.

X ¹¹ , X ¹² and X ¹³ each independently represent a hydrogen atom, a hydroxyl group or an acetoxy group. Of X ¹¹ , X ¹² and X ¹³ , 0 to 1 are preferably a hydroxyl group and the remainder is a hydrogen atom. When Z is a methine group, only one of X ¹¹ and X ¹² is a hydrogen atom, and the other does not exist. X ¹⁴ is preferably a hydrogen atom or a glyceryl group.
R ¹³ and R ^{14 each} represents a hydrogen atom, a hydroxyl group, a hydroxymethyl group or an acetoxymethyl group, and preferred R ¹³ is a hydrogen atom or a hydroxymethyl group, and preferred R ¹⁴ is a hydrogen atom.

R ¹⁵ may be a hydroxyl group, a carbonyl group, or an amino group, may be substituted, may have an ether bond, an ester bond or an amide bond in the main chain, and may be a straight chain, branched chain or A cyclic saturated or unsaturated hydrocarbon group is shown. Preferably, the hydroxyl group or amino group may be substituted a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 5 to 35 carbon atoms, or a hydroxyl group at the ω position of the hydrocarbon group In which a straight-chain, branched or cyclic saturated or unsaturated fatty acid having 8 to 22 carbon atoms which may be substituted is an ester bond or an amide bond. The fatty acid to be bonded is preferably isostearic acid, 12-hydroxystearic acid or linoleic acid.

R ¹⁶ represents a hydrogen atom, or may have a substituent selected from a hydroxyl group, a hydroxyalkoxy group, an alkoxy group, and an acetoxy group. It is a saturated hydrocarbon group. When R ¹² is a hydrogen atom and Z is an oxygen atom, R ¹⁶ is a hydrocarbon group having 10 to 30 carbon atoms in total. When R ¹² is a hydrocarbon group, R ¹⁶ is a hydrocarbon group having 1 to 8 carbon atoms in total. A hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms in total, which may be substituted with 1 to 3 groups selected from a hydroxyl group, a hydroxyalkoxy group and an alkoxy group, is preferred. Here, the hydroxyalkoxy group and the alkoxy group are preferably those having 1 to 7 carbon atoms.

The ceramide represented by the general formula (7) is preferably a ceramide represented by the following general formula (8) or (9).
(I) Naturally derived ceramide represented by the general formula (8) or a synthetic product having the same structure and a derivative thereof (hereinafter referred to as natural ceramide).

 

 

(Wherein R ²² represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 7 to 19 carbon atoms which may be substituted by a hydroxyl group; Z ₁ represents a methylene group or a methine group; X ¹⁵ , X ¹⁶ and X ¹⁷ each independently represent a hydrogen atom, a hydroxyl group or an acetoxy group; X ¹⁸ represents a hydrogen atom or together with an adjacent oxygen atom, forms an oxo group. (However, when Z ₁ is a methine group, _one of X ¹⁵ and X ¹⁶ is a hydrogen atom and the other does not exist. When X ¹⁸ forms an oxo group, X ¹⁷ does not exist.); R ²³ represents a hydroxymethyl group or an acetoxymethyl group; R ²⁴ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; R ²⁵ has 5 to 30 carbon atoms which may be substituted by a hydroxyl group Linear, branched or cyclic saturated or unsaturated hydrocarbon groups Or a linear or branched saturated or unsaturated fatty acid having 8 to 22 carbon atoms which may be substituted with a hydroxyl group at the ω-terminus of the alkyl group; Indicates that it may be an unsaturated bond.)

Preferably, R ²² is a linear alkyl group having 7 to 19 carbon atoms, more preferably 13 to 15 carbon atoms; R ²⁵ is a linear alkyl group having 9 to 27 carbon atoms which may be substituted with a hydroxyl group, or linoleic acid Is a straight-chain alkyl group having 9 to 27 carbon atoms bonded with an ester. X ¹⁸ preferably represents a hydrogen atom or forms an oxo group together with an oxygen atom. R ²⁵ is preferably tricosyl, 1-hydroxypentadecyl, 1-hydroxytricosyl, heptadecyl, 1-hydroxyundecyl, or a nonacosyl group in which linoleic acid is ester-bonded to the ω position.

Specific examples of natural ceramides include ceramide types 1 to 7 in which sphingosine, dihydrosphingosine, phytosphingosine or sphingadienin is amidated (for example, J. Lipid Res., 24: 759 (1983), FIG. And J. Lipid. Res., 35: 2069 (1994), porcine and human ceramides described in FIG.

Further, these N-alkyl compounds (for example, N-methyl compounds) are also included.
These ceramides may be either natural (D (−)) optically active or non-natural (L (+)) optically active, or a mixture of natural and non-natural types. May be used. The relative configuration of the above compound may be a natural configuration, a non-natural configuration other than that, or a mixture thereof. Of these, compounds of CERAMIDE1, CERAMIDE2, CERAMIDE3, CERAMIDE5, CERAMIDE6II (hereinafter referred to as INCI, 8th Edition) and those represented by the following formula are preferable.

 

 

These may be either natural extracts or synthetic products, and commercially available products can be used. Examples of such commercially available ceramides include Ceramide 、 I, Ceramide III, Ceramide IIIA, Ceramide IIIB, Ceramide IIIC, Ceramide VI (above, Cosmo Farm), Ceramide TIC-001 (Takasago Inc.), CERAMIDE 、 II (Quest International), DS-Ceramide VI, DS-CLA-Phytoceramide, C6-Phytoceramide, DS-ceramide Y3S (DOOSAN), CERAMIDE2 (Cedama).

 

 

(II) A pseudo-ceramide represented by the general formula (9).

 

 

(Wherein R ²⁶ represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group or a hydrogen atom having 10 to 22 carbon atoms which may be substituted by a hydroxyl group; X ¹⁹ represents a hydrogen atom; Acetyl group or glyceryl group; R ²⁷ is a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 5 to 22 carbon atoms which may be substituted with a hydroxyl group or an amino group; Or an ester bond of a linear or branched saturated or unsaturated fatty acid having 8 to 22 carbon atoms which may be substituted with a hydroxyl group at the ω-terminal of the hydrocarbon group; R ²⁸ represents a hydrogen atom Or a hydroxyl group, a hydroxyalkoxy group, an alkoxy group or an acetoxy group which may be substituted is an alkyl group having 1 to 30 carbon atoms in total.

R ²⁷ includes nonyl, tridecyl, pentadecyl, an undecyl group in which linoleic acid is ester-bonded to the ω-position, a pentadecyl group in which linoleic acid is ester-bonded to the ω-position, a pentadecyl group in which 12-hydroxystearic acid is ester-bonded to the ω-position, An undecyl group in which methyl branched isostearic acid is amide-bonded at the ω position is preferred.

When R ²⁶ is a hydrogen atom, R ²⁸ is an alkyl group having a total carbon number of 10 to 30, preferably a total carbon number of 12 to 20, which may be substituted by a hydroxyl group, a hydroxyalkoxy group, an alkoxy group or an acetoxy group. Yes; when R ²⁶ is a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 10 to 22 carbon atoms which may be substituted with a hydroxyl group, R ²⁸ represents a hydrogen atom, It is preferably an alkyl group having 1 to 8 carbon atoms which may be substituted by a group, a hydroxyalkoxy group, an alkoxy group or an acetoxy group. As the hydroxyalkoxy group or alkoxy group for R ²⁸ , those having 1 to 7 carbon atoms are preferred.

 

 

In general formula (9), R ²⁶ is a hexadecyl group, X ¹⁹ is a hydrogen atom, R ²⁷ is a pentadecyl group, R ²⁸ is a hydroxyethyl group; R ²⁶ is a hexadecyl group, X ¹⁹ is a hydrogen atom, and R ²⁷ is A pseudo-ceramide having a nonyl group and R ²⁸ of hydroxyethyl group is preferred, and R ²⁶ of general formula (9) is a hexadecyl group, X ¹⁹ is a hydrogen atom, R ²⁷ is a pentadecyl group, and R ²⁸ is a hydroxyethyl group ( N- (hexadecyloxyhydroxypropyl) -N-hydroxyethylhexadecanamide) is more preferred.

 

 

As the component (B), one or more of (B1), (B2), (B3), (B4), and (B5) can be used.
The oil component of component (B) contains at least one selected from (B1), (B2), (B3), (B4) and (B5). In the composition of the present invention, α-gel From the viewpoint of maintaining a stable α-gel layered structure, it is preferable to include at least (B1), and together with (B1), (B2), (B3), (B4) and It is preferable that 1 or more types chosen from (B5) are included.

In the cosmetic composition of the present invention, the total content of (B1), (B2), (B3), (B4) and (B5) has a layered α-gel structure and a uniform appearance. From the viewpoint of excellent shape retention and excellent moistness and familiarity when used, and an appropriate amount of the cosmetic composition can be easily obtained, it is preferably 0.1 to 30 mass in the cosmetic composition. %, More preferably 0.5 to 25% by mass, still more preferably 1 to 20% by mass, and still more preferably 1.5 to 20% by mass.

In addition to the above (B1) to (B5), the oily component of component (B) can contain oily components used in ordinary cosmetics. For example, hydrocarbon oils such as liquid paraffin, squalane and petrolatum; ether oils other than (B2) and (B5) such as cetyldimethylbutyl ether, ethylene glycol dioctyl ether, glycerol monooleyl ether; octyldodecyl myristate, isopropyl palmitate, Ester oils other than (B1) such as butyl stearate, di-2-ethylhexyl adipate, neopentyl glycol dicaprate, and trioctanoin; higher alcohols other than (B3) such as lauryl alcohol; (B4) such as lauric acid Higher fatty acids other than: dimethylpolysiloxane, cyclic dimethylpolysiloxane, methylphenylpolysiloxane, amino-modified silicone, carboxy-modified silicone, alcohol-modified silicone, alkyl-modified silicone, Rieteru modified silicone, silicone oil and fluorine-modified silicone; perfluoroalkylethyl phosphoric acid, perfluoroalkyl polyoxyethylene phosphoric acid, a perfluoropolyether, such as fluorine-based oils such as polytetrafluoroethylene. These oily components may be derived from plants.

The content of the oily component (B) has a layered α-gel structure, a uniform appearance, excellent shape retention, and has a moist and familiar feeling when used. From the viewpoint of obtaining an appropriate amount of the cosmetic composition, it is preferably 1% by mass or more, more preferably 2% by mass or more, further preferably 3% by mass or more, and preferably 40% by mass or less in the cosmetic composition. The mass% or less is more preferable, and 20 mass% or less is more preferable. In addition, the content of the component (B) is preferably 1 to 40% by mass, more preferably 2 to 30% by mass, and further preferably 3 to 20% by mass in the cosmetic composition.

The viscosity at 25 ° C. of the cosmetic composition of the present invention is 1.5 Pa · s or more. Containing component (A), component (B) and component (C) in the present invention, and having a viscosity at 25 ° C. of 1.5 Pa · s or more, the cosmetic composition has a structure in which lamellar layers are overlapped, It has a so-called layered lamellar structure. The lamellar lamella structure exhibits a higher viscosity because the continuous phase has a firm structure as compared with a structure in which concentric lamella exists in the continuous phase water, that is, a so-called spherulite lamella structure.
From the above, the viscosity at 25 ° C. of the cosmetic composition exhibiting the layered α-gel of the present invention is preferably 2 Pa · s or more, more preferably 5 Pa · s or more, further preferably 10 Pa · s or more, further preferably 200 Pa · s. s or less is preferable, 150 Pa · s or less is more preferable, and 100 Pa · s or less is more preferable.
In addition, this viscosity means the value measured at 25 degreeC using the B-type viscometer, and can be measured according to the method as described in an Example more specifically.

From such a viewpoint, the cosmetic composition of the present invention contains (B) an oil component containing at least one selected from (B1) and (B2), (B3), (B4) and (B5). Is preferred.
Further, the ratio of the content of (A) copolymer, the content of (B1), and the total content of (B2), (B3), (B4) and (B5) [(A) / (B1 ) / {(B2) + (B3) + (B4) + (B5)}] is a range surrounded by the following points in the triangular diagram shown in FIG. 1, and the viscosity of the composition is 2 Pa · s. Since it becomes above, it is preferable.
Point A1 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/5/50
Point A2 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 5 / 87.5
Point A3 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 85 / 7.5
Point A4 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35 / 57.5 / 7.5
Point A5 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/50/15
Point A6 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/40/15

Further, the ratio [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] is a range surrounded by the following points in the triangular diagram shown in FIG. Is more preferable because the viscosity of the composition is 5 Pa · s or more.
Point B1 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/15/40
Point B2 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/15/50
Point B3 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/5/60
Point B4 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 5 / 87.5
Point B5 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 85 / 7.5
Point B6 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 25 / 67.5 / 7.5
Point B7 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 25/60/15
Point B8 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/40/15

Further, the ratio [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] is a range surrounded by the following points in the triangular diagram shown in FIG. Is more preferable because the viscosity of the composition is 10 Pa · s or more.
Point C1 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/15/40
Point C2 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/15/50
Point C3 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/5/60
Point C4 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 5 / 87.5
Point C5 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 85 / 7.5
Point C6 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 25 / 67.5 / 7.5
Point C7 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 25/60/15
Point C8 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/50/15
Point C9 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/40/25
Point C10 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/30/25

(C) Water:
The water content has a layered α-gel structure, a uniform appearance, excellent shape retention, and is excellent in moistness and familiarity when used, from the viewpoint of good fingering. In the cosmetic composition, 40% by mass or more is preferable, 45% by mass or more is more preferable, 50% by mass or more is more preferable, 98% by mass or less is preferable, 96% by mass or less is more preferable, and 95% by mass or less. Is more preferable. The content of component (C) is preferably 40 to 98% by mass, more preferably 45 to 96% by mass, and further preferably 50 to 95% by mass in the cosmetic composition.

The cosmetic composition of the present invention further comprises active ingredients and additives usually used in other cosmetics, for example, water-soluble vitamins such as ascorbic acid, nicotinic acid amide, and nicotinic acid; buckwheat extract, licorice extract, aloe extract , Horsetail extract, Tea extract, Cucumber extract, Clove extract, Carrot extract, Clam extract, Placenta extract, Seaweed extract, Maronier extract, Chamomile extract, Yuzu extract, Clove extract, Asunaro extract, Altea extract, Royal jelly extract, Eucalyptus extract, Brown algae Extracts obtained from animals and plants such as extracts and asunaro extracts; bases such as potassium hydroxide, sodium hydroxide, triethanolamine, sodium carbonate; citric acid, tartaric acid, lactic acid, phosphoric acid, succinic acid, adipic acid, etc. Acid of Carboxybi Polymer, sodium alginate, carrageenan, carboxymethyl cellulose, hydroxyethyl cellulose, guar gum, xanthan gum, carboxymethyl chitosan, sodium hyaluronate, oxazoline-modified silicone, N, N-dimethylaminoethyl diethyl methacrylate sulfate, N, N-dimethylacrylamide di Thickeners such as a polyethylene glycol methacrylate copolymer can also be contained.
The cosmetic composition of the present invention can further contain a surfactant, but the content of the cosmetic composition of the present invention in the cosmetic composition from the viewpoint of forming a good layered α-gel. Is preferably 3% by mass or less, more preferably 2% by mass or less, still more preferably 1% by mass or less, still more preferably 0.5% by mass or less, and still more preferably substantially not contained.

The cosmetic composition of the present invention forms a layered α-gel. The formation of the layered α-gel can be confirmed by XRD (X-ray diffraction) and observation with a polarizing microscope. Specifically, when a Bragg angle of around 21 to 22 ° is observed in wide-angle X-ray diffraction, in the case of a composition in which a crystal structure is formed, a plurality of large and small peaks appear and a liquid crystal structure is formed. In the case of the composition, a broad peak appears. In contrast, in the case of a composition in which an α-gel structure is formed, the lipophilic group is oriented at right angles to the surface of the hydrophilic base layer because of the hexagonal system, and the Bragg angle is 21 to 22 °. Since a sharp diffraction peak appears in the vicinity, the presence or absence of α-gel can be determined by the presence or absence of such a peak.
Furthermore, in the observation with a polarizing microscope, crystals are observed in the case of a composition having a crystal structure, and maltese cloth is observed in the case of a composition having a spherical gel structure. In contrast, in the case of a composition in which a layered α-gel structure is formed, the entire field of view is dark and crystals and maltese crosses are hardly observed, or the entire field of view is dark and fine in only a part of the field of view. Crystals or maltese cloth are observed. Therefore, it is confirmed by XRD (X-ray diffraction) whether the composition has an α-gel structure, whether the composition is lamellar or spherical by observation with a polarizing microscope, and whether the composition is formed of a lamellar α-gel. Can be judged.
The cosmetic composition of the present invention can be produced by a usual method. Specifically, for example, a method in which (A) a copolymer and (B) an oily component are mixed solubilized, and then (C) a method of adding water and cooling, a so-called phase inversion emulsification method is used. Can be used.
The cosmetic composition of the present invention may be taken in an appropriate amount or may be included in a woven fabric or non-woven fabric, etc., and applied to any skin except hair, preferably the face, body, limbs, etc. Can be used.
This invention discloses the following compositions further regarding embodiment mentioned above.

<1> A cosmetic composition containing the following components (A), (B) and (C) and having a viscosity at 25 ° C. of 1.5 Pa · s or more.
(A) the structural unit (a) represented by the general formula (1), the structural unit (b) represented by the general formula (2), and the structural unit (c) represented by the general formula (3),
In the copolymer, the structural unit (a) is contained in an amount of 1% by mass to 23% by mass,
A copolymer having a mass ratio of the structural unit (c) to the structural unit (b) (structural unit (c) / structural unit (b)) of 0.19 to 2.2;

 

 

(Wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms; R ¹⁰ represents an alkylene group having 2 to 4 carbon atoms, R ¹¹ represents a linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms, X ¹ represents OM or NHC (CH ₃ ) ₂ CH ₂ SO ₂ M (M represents a hydrogen atom or a cation group), X ² represents NR ¹² R ¹³ (R ¹² and R ¹³ each have 1 or 2 carbon atoms which may have a hydrogen atom or a hydroxy group) Represents an alkyl group, except that R ¹² and R ¹³ are simultaneously a hydrogen atom) or OR ¹⁴ (R ¹⁴ represents a C 2 or C 3 alkyl group having a hydroxy group), and X ³ represents oxygen Represents an atom or NH, and n represents an integer of 0 to 3.)
(B) an oil component containing at least one selected from the following (B1) to (B5):
(B1) one or more selected from glycerin monofatty acid esters having 14 or more carbon atoms and sorbitan difatty acid esters having 14 or more carbon atoms,
(B2) glycerol monoalkyl ether having 14 or more carbon atoms,
(B3) a higher alcohol having 14 or more carbon atoms,
(B4) a higher fatty acid having 14 or more carbon atoms,
(B5) Ceramides,
(C) Water

<2> In the component (A), the structural unit (a) represented by the general formula (1) is a structural unit derived by polymerizing a monomer represented by the following general formula (4).

 

 

(Wherein R ¹ , R ² and R ³ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms; X ¹ represents OM or NHC (CH ₃ ) ₂ CH ₂ SO ₂ M (M Represents a hydrogen atom or a cation group)),
The monomer represented by the general formula (4) is acrylic acid, methacrylic acid, crotonic acid, 2-acrylamido-2-methylpropanesulfonic acid, and includes acrylic acid, methacrylic acid, crotonic acid, 2-acrylamide- 2-Methylpropanesulfonic acid is preferable, acrylic acid, methacrylic acid, 2-acrylamido-2-methylpropanesulfonic acid is more preferable, and 2-acrylamido-2-methylpropanesulfonic acid is more preferable. Composition.

In the copolymer of <3> component (A), the content of the structural unit (a) is preferably 2% by mass or more, more preferably 3% by mass or more, further preferably 4% by mass or more, The cosmetic composition according to the above <1> or <2>, preferably 20% by mass or less, more preferably 15% by mass or less, further preferably 10% by mass or less, and still more preferably 8% by mass or less.
<4> In the component (A), the structural unit (b) represented by the general formula (2) is a structural unit derived by polymerizing a monomer represented by the following general formula (5),

 

 

(Wherein R ⁴ , R ⁵ and R ⁶ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, X ² represents NR ¹² R ¹³ (R ¹² and R ¹³ represent a hydrogen atom or a hydroxy group) An alkyl group having 1 or 2 carbon atoms which may have a group, provided that R ¹² and R ¹³ are simultaneously a hydrogen atom, or OR ¹⁴ (R ¹⁴ is a carbon atom having a hydroxy group or 2 or 3 represents an alkyl group).
The monomer represented by the general formula (5) is preferably dimethylacrylamide, hydroxyethylacrylamide, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxypropyl methacrylate, The cosmetic composition according to any one of <1> to <3>, wherein dimethylacrylamide is more preferable, and dimethylacrylamide is more preferable.

In the copolymer of <5> component (A), the content of the structural unit (b) is preferably 30% by mass or more, more preferably 35% by mass or more, further preferably 40% by mass or more, and 45 % By mass or more is more preferable, 80% by mass or less is preferable, 75% by mass or less is more preferable, 70% by mass or less is further preferable, 65% by mass or less is more preferable, and 60% by mass or less is more preferable. The cosmetic composition according to any one of 1> to <4>.
In the copolymer of <6> component (A), the structural unit (c) represented by the general formula (3) is derived by polymerizing the monomer represented by the following general formula (6). And

 

 

Wherein R ⁷ , R ⁸ and R ⁹ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, R ¹⁰ represents an alkylene group having 2 to 4 carbon atoms, and R ¹¹ represents carbon. A linear or branched alkyl or alkenyl group having a number of 1 to 30. X ² represents an oxygen atom or NH, and n represents an integer of 0 to 3.)
The structural unit (c) is preferably a structural unit represented by the following formula (3 ′), a structural unit derived from a monomer represented by the following general formula (6 ′),

 

 

(In the formula, R ⁷ , R ⁸ , R ⁹ and R ¹¹ have the same meaning as described above.)
The monomer represented by the general formula (6) is preferably methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, iso-butyl (meth) acrylate, (meth) N-hexyl acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-decyl (meth) acrylate, lauryl (meth) acrylate, myristyl (meth) acrylate, (meth) Palmityl acrylate, stearyl (meth) acrylate, behenyl (meth) acrylate, butyl (meth) acrylate, lauryl (meth) acrylate, myristyl (meth) acrylate, palmityl (meth) acrylate, ( More preferred are stearyl acrylate and behenyl (meth) acrylate, butyl (meth) acrylate, (meth Stearyl acrylate, behenyl (meth) acrylate is more preferable that the <1> to cosmetic compositions as claimed in any one of <5>.

<7> The copolymer according to any one of <1> to <6>, wherein R ¹¹ is an alkyl group or an alkenyl group having 4 to 22 carbon atoms in the structural unit (c) in the copolymer of component (A). Cosmetic composition.
<8> In the copolymer of the component (A), the content of the structural unit (c) is preferably 15% by mass or more, more preferably 20% by mass or more, further preferably 25% by mass or more, 30 % By mass or more is more preferable, 35% by mass or more is more preferable, 65% by mass or less is preferable, 60% by mass or less is more preferable, 55% by mass or less is further preferable, and 50% by mass or less is more preferable. The cosmetic composition according to any one of 1> to <7>.

In the copolymer of <9> component (A), the mass ratio ((c) / (b)) between the content of the structural unit (b) and the content of the structural unit (c) is preferably 0.25. Or more, 0.3 or more is more preferable, 0.4 or more is more preferable, 0.6 or more is more preferable, 0.7 or more is further more preferable, 0.85 or more is still more preferable, 1.6 The following is preferable, 1.4 or less is more preferable, 1.2 or less is more preferable, 1 or less is more preferable, 0.98 or less is further more preferable, and 0.95 or less is more preferable. The cosmetic composition according to any one of 8>.
<10> In the copolymer of component (A), the mass ratio of the content of the structural unit (a) and the total content of the structural unit (b) and the structural unit (c) ({(b) + (c) } / (A)) is preferably 4 or more, more preferably 5 or more, further preferably 9 or more, still more preferably 12 or more, preferably 50 or less, more preferably 25 or less <1> to The cosmetic composition according to any one of <9>.

The total content of the structural unit (a), the structural unit (b) and the structural unit (c) in the copolymer of <11> component (A) is preferably 70% by mass or more, and 80% by mass or more. More preferably, 90% by mass or more is further preferable, 95% by mass or more is more preferable, substantially 100% by mass is further more preferable, and 100% by mass is even more preferable. Any one of the above items <1> to <10> The cosmetic composition as described.
The content of the copolymer of <12> component (A) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and 0.7% by mass or more in the cosmetic composition. Is more preferable, 0.9 mass% or more is more preferable, 10 mass% or less is preferable, 5 mass% or less is more preferable, 3 mass% or less is further preferable, and 2 mass% or less is more preferable <1>. The cosmetic composition according to any one of <11>.

<13> (B1) In the glycerin monofatty acid ester having 14 or more carbon atoms and the sorbitan difatty acid ester having 14 or more carbon atoms, the carbon number of the fatty acid is preferably 14 to 22, more preferably 16 to 22, The cosmetic composition according to any one of the above items <1> to <12>, more preferably from 22 to 22.
<14> (B1) is preferably glycerin monomyristic acid ester, glycerin monopalmitic acid ester, glycerin monostearic acid ester, glycerin monobehenic acid ester, glycerin monooleic acid ester, sorbitan distearate, and has 14 carbon atoms. The cosmetic composition according to any one of <1> to <13>, wherein the glycerin monofatty acid ester is more preferable.
<15> (B2) In glycerol monoalkyl ether having 14 or more carbon atoms, the carbon number of the alkyl group is preferably 14 to 22, more preferably 16 to 22, further preferably 18 to 22, and glycerol monostereal. The cosmetic composition according to any one of <1> to <14>, wherein ether is more preferable.

<16> (B3) In the higher alcohol having 14 or more carbon atoms, the alkyl group preferably has 14 to 22, more preferably 16 to 22, more preferably 18 to 22, myristyl alcohol, cetyl alcohol. , Stearyl alcohol, behenyl alcohol, and oleyl alcohol, more preferably any one of the above <1> to <15>.
<17> (B4) In the higher fatty acid having 14 or more carbon atoms, the carbon number of the alkyl group is preferably 14 to 22, more preferably 16 to 22, further preferably 18 to 22, myristic acid, palmitic acid The cosmetic composition according to any one of <1> to <16>, wherein stearic acid and behenic acid are more preferable.
<18> (B5) Ceramide is preferably represented by the general formula (7)

 

 

(Wherein R ¹² represents a linear, branched or cyclic saturated or unsaturated hydrocarbon group or hydrogen atom having 4 to 30 carbon atoms, which may be substituted by a hydroxyl group, a carbonyl group or an amino group. Z represents a methylene group, a methine group or an oxygen atom; X ¹¹ , X ¹² and X ¹³ each independently represent a hydrogen atom, a hydroxyl group or an acetoxy group, and X ¹⁴ represents a hydrogen atom, an acetyl group or a glyceryl group; or shown, together with the adjacent oxygen atom, forms an oxo group (provided that when Z is a methine group, either X ¹¹ and X ¹² is a hydrogen atom, is .X ¹⁴ to the other is not present X ¹³ is not present when forming an oxo group.); R ¹³ and R ¹⁴ each independently represent a hydrogen atom, a hydroxyl group, a hydroxymethyl group or an acetoxymethyl group; R ¹⁵ is a hydroxyl group, a carbonyl A linear or branched or cyclic saturated or unsaturated carbon atom having 5 to 60 carbon atoms, which may have an ether bond, ester bond or amide bond in the main chain, which may be substituted by a group or amino group Represents a hydrogen group; R ¹⁶ represents a hydrogen atom, or may have a substituent selected from a hydroxyl group, a hydroxyalkoxy group, an alkoxy group and an acetoxy group, and is a straight chain or branched chain having 1 to 30 carbon atoms in total A saturated or unsaturated hydrocarbon group of the chain (provided that when R ¹² is a hydrogen atom and Z is an oxygen atom, R ¹⁶ is a hydrocarbon group having 10 to 30 carbon atoms in total, and R ¹² is a hydrocarbon group; When R ¹⁶ is a hydrocarbon group having 1 to 8 carbon atoms in total; the broken line portion may indicate an unsaturated bond)
The cosmetic composition according to any one of the above items <1> to <17>, which is represented by:

<19> The above-mentioned <1> to <18>, wherein the component (B) preferably contains (B1) one or more selected from glycerin monofatty acid esters having 14 or more carbon atoms and sorbitan difatty acid esters having 14 or more carbon atoms. The cosmetic composition according to any one of the above.
<20> Component (B) further includes (B2) glycerol monoalkyl ether having 14 or more carbon atoms, (B3) higher alcohol having 14 or more carbon atoms, (B4) higher fatty acid having 14 or more carbon atoms, and (B5) ceramide. <19> The cosmetic composition according to the above <19>, comprising at least one selected from the group.
<21> The total content of (B1), (B2), (B3), (B4) and (B5) is preferably 0.1 to 30% by mass in the cosmetic composition, 0.5 The cosmetic composition according to any one of the above items <1> to <20>, preferably from 25 to 25% by mass, more preferably from 1 to 20% by mass, and even more preferably from 1.5 to 20% by mass.
<22> Ratio of the content of (A) copolymer, the content of (B1), and the total content of (B2), (B3), (B4) and (B5) [(A) / ( B1) / {(B2) + (B3) + (B4) + (B5)}] is preferably a range surrounded by the following points in the triangular diagram shown in FIG.
Point A1 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/5/50
Point A2 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 5 / 87.5
Point A3 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 85 / 7.5
Point A4 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35 / 57.5 / 7.5
Point A5 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/50/15
Point A6 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/40/15
The ratio [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] is a range surrounded by the following points in the triangular diagram shown in FIG. More preferred;
Point B1 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/15/40
Point B2 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/15/50
Point B3 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/5/60
Point B4 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 5 / 87.5
Point B5 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 85 / 7.5
Point B6 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 25 / 67.5 / 7.5
Point B7 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 25/60/15
Point B8 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/40/15
The ratio [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] is a range surrounded by the following points in the triangular diagram shown in FIG. Even more preferred;
Point C1 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/15/40
Point C2 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/15/50
Point C3 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/5/60
Point C4 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 5 / 87.5
Point C5 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 7.5 / 85 / 7.5
Point C6 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 25 / 67.5 / 7.5
Point C7 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 25/60/15
Point C8 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/50/15
Point C9 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 35/40/25
Point C10 [(A) / (B1) / {(B2) + (B3) + (B4) + (B5)}] = 45/30/25
The cosmetic composition according to any one of <1> to <21>.

The content of the <23> component (B) is preferably 1% by mass or more, more preferably 2% by mass or more, further preferably 3% by mass or more, and preferably 40% by mass or less in the cosmetic composition. The cosmetic composition according to any one of <1> to <22>, more preferably 30% by mass or less, and still more preferably 20% by mass or less.
<24> (C) The content of water in the cosmetic composition is preferably 40% by mass or more, more preferably 45% by mass or more, further preferably 50% by mass or more, and preferably 98% by mass or less. 96. The cosmetic composition according to any one of <1> to <23>, more preferably 96% by mass or less, and still more preferably 95% by mass or less.

<25> The cosmetic composition according to any one of <1> to <24>, which has an α-gel structure.
<26> The viscosity at 25 ° C. is preferably 2 Pa · s or more, more preferably 5 Pa · s or more, further preferably 10 Pa · s or more, preferably 200 Pa · s or less, more preferably 150 Pa · s or less, The cosmetic composition according to any one of <1> to <25>, further preferably 100 Pa · s or less.
<27> In the cosmetic composition, the content of the surfactant is preferably 3% by mass or less, more preferably 2% by mass or less, further preferably 1% by mass or less, and further preferably 0.5% by mass or less. The cosmetic composition according to any one of the above items <1> to <26>, which is more preferably not contained substantially.
<28> A method for using the cosmetic composition, wherein the cosmetic composition according to any one of <1> to <27> is applied to skin, preferably the face, body or limbs, excluding hair.

Hereinafter, the present invention will be specifically described based on examples.
The monomer (a) for deriving the structural unit (a), the monomer (b) for deriving the structural unit (b), the monomer (c) for deriving the structural unit (c), a solvent, Table 1 shows the abbreviations of the initiator and the structure of the structural unit derived from each monomer.

Production Example 1 (Production of Copolymer 1)
The copolymer 1 was manufactured using the monomer, initiator, and solvent which are shown in Table 2.
That is, first, 125.0 g of ethanol was charged into a reactor having a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube, and the temperature was raised to 78 ° C. in a nitrogen atmosphere. Separately, 12.5 g of acrylamide-2-methylpropanesulfonic acid (AMPS, manufactured by SIGMA-ALDRICH), 125.0 g of dimethylacrylamide (DMAAm, manufactured by Kojin Co.), stearyl methacrylate (SMA, manufactured by Shin-Nakamura Chemical Co., Ltd.) 112 1.5 g, 1.75 g of dimethyl 2,2′-azobis (isobutyrate) (trade name “V-601”, manufactured by Wako Pure Chemical Industries, Ltd.) as an initiator, and 250.0 g of ethanol were uniformly mixed, and the dropping speed was The solution was dropped into the reactor at 2.0 g / min over 2 hours. After completion of dropping, the mixture was aged by maintaining at 78 ° C. for 4 hours. Then, the obtained reaction liquid was dried under reduced pressure at 50 ° C., and ethanol was distilled off to obtain a copolymer 1.

Production Example 2 (Production of Copolymers 2 to 16, 18)
Copolymers 2 to 16 and 18 were obtained in the same manner as in Production Example 1 except that each monomer, initiator, solvent and reaction concentration were as shown in Table 2.

Production Example 3 (Production of Copolymer 17)
In a reactor having a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube, 233.3 g of isopropanol, 5.0 g of acrylic acid (AA, manufactured by Wako Pure Chemical Industries, Ltd.), dimethylacrylamide (DMAAm, manufactured by Kojin Co.) 55 0.0 g and 40.0 g of behenyl acrylate (BEA, NOF Corporation) were added, mixed uniformly, and stirred for 30 minutes in a nitrogen atmosphere. Thereafter, the temperature was raised to 78 ° C., and 0.35 g of 2,2′-azobis (isobutyric acid) dimethyl (trade name “V-601”, manufactured by Wako Pure Chemical Industries, Ltd.) as an initiator was dissolved in 10.0 g of isopropanol. The solution was added. Polymerization was carried out by holding at 78 ° C. for 2 hours, and further aging was carried out by holding for 4 hours. Thereafter, the obtained reaction solution was dried under reduced pressure at 50 ° C., and isopropanol was distilled off to obtain a copolymer 17.

Production Example 4 (Production of Copolymer 19)
In a reactor having a stirrer, a reflux condenser, a thermometer, and a nitrogen introduction tube, 233.3 g of isopropanol, methoxypolyethylene glycol methacrylate (9 mol) (PEGMA, Shin-Nakamura Chemical Co., Ltd.) 60.0 g, stearyl methacrylate (SMA) 40.0 g, manufactured by Shin-Nakamura Chemical Co., Ltd.), mixed uniformly, and stirred for 30 minutes in a nitrogen atmosphere. Thereafter, the temperature was raised to 56 ° C., and 1.0 g of 2,2′-azobis (isobutyric acid) dimethyl (trade name “V-601”, manufactured by Wako Pure Chemical Industries, Ltd.) as an initiator was dissolved in 10.0 g of isopropanol. The solution was added. Polymerization was carried out by maintaining at 56 ° C. for 2 hours, followed by further aging by maintaining for 4 hours. Thereafter, the obtained reaction solution was dried under reduced pressure at 50 ° C., and isopropanol was distilled off to obtain a copolymer 19.

<Measurement of weight average molecular weight>
The obtained copolymer was dissolved in N, N-dimethylformamide (DMF) to prepare a 0.5 mass% solution, and this was used to measure the weight average molecular weight by gel permeation chromatography (GPC). . The weight average molecular weight was calculated | required as a polystyrene conversion value. The conditions for GPC measurement are as follows.
Two columns: α-M (manufactured by Showa Denko) were connected in series and used.
Eluent: DMF solution with H3PO4 concentration of 60 mmol / L and LiBr concentration of 50 mmol / L Flow rate: 1.0 mL / min
Column temperature: 40 ° C
Detector: RI (differential refractometer)
Calibration curve: Prepared using polystyrene.
The results are shown in Table 2.

Examples 1-2, Comparative Examples 1-5
A cosmetic composition having the composition shown in Table 3 was produced, and the appearance, viscosity, observation of the layered α-gel structure (XRD, polarized microscopic image), properties (moist feeling, familiar feeling, finger feel) and residual water content were determined. evaluated. The results are also shown in Table 3.

(Production method)
(1) Examples 1-2 and Comparative Examples 1-3:
Copolymer (Copolymer 1 in Examples 1 and 2, Copolymer 19 in Comparative Example 1, Copolymer 18 in Comparative Example 2, Copolymer (methacryloyloxyethyl phosphorylcholine / stearyl methacrylate) in Comparative Example 3 , Lipidure S, manufactured by NOF Corporation) 1 g, 2 g of cetyl alcohol (Cetanol NX, manufactured by Higher Alcohol Industry Co., Ltd.), and 2 g of glyceryl monobehenate (Sunsoft No8100-C, manufactured by Taiyo Chemical Co., Ltd.) at 80 ° C. Other oily components (α-olefin oligomer (SILKFLO 364 NF, manufactured by LIPO CHEMICALS), neopentyl glycol dicaprate (Esthemol N-01, manufactured by Nisshin Oillio Group), Olive oil (Cropure OL-LQ- (JP), made by Croda Japan Co.))) and mixed with these), glycerin heated to 80 ° C 10 g of an aqueous solution containing 86% glycerin (manufactured by Kao Corporation, 86% by mass effective) was added and stirred with a propeller (350 rpm) for 5 minutes. Then, while continuing stirring at 80 ° C., potassium hydroxide (white caustic flakes, manufactured by Nippon Soda Co., Ltd.) was added to neutralize and stirred until uniform for 5 minutes, and then separately added so that the total amount became 100 g. Purified water that had been heated to 0 ° C. was slowly added over 15 minutes. Then, it ice-cooled until it became 25 degreeC, keeping stirring, and obtained the cosmetic composition.
In Comparative Example 3, since the (methacryloyloxyethyl phosphorylcholine / stearyl methacrylate) copolymer was not dissolved in cetyl alcohol or glyceryl monobehenate, it was dispersed to produce a cosmetic composition.

(2) Comparative Examples 4 to 5:
1 g of acrylic acid / alkyl methacrylate copolymer (PEMULEN TR-2, manufactured by Lubrizol Advanced Materials), 74.5 g of purified water and 10 g of glycerin-containing aqueous solution (86% glycerin, Kao Corporation, effective content 86% by mass) The mixed and dissolved aqueous phase was dispersed for 10 minutes at 2000 rpm using a disper. After heating to 80 ° C., an oil phase (other oil properties) obtained by heating and dissolving 2 g of cetyl alcohol (cetanol NX, manufactured by Higher Alcohol Industry) and 2 g of glyceryl monobehenate (Sunsoft No8100-C, manufactured by Taiyo Chemical Co., Ltd.) at 80 ° C. Ingredients (α-olefin oligomer (Sunsoft No8100-C, Taiyo Kagaku), neopentyl glycol dicaprate (SILKFLO 364 NF, manufactured by LIPO CHEMICALS), Olive oil (Cropure OL-LQ- (JP), Croda Japan) If there is a product)), the mixture) was added thereto, and the mixture was stirred with a propeller for 5 minutes (350 rpm). Thereafter, while stirring at 80 ° C., an aqueous phase obtained by dissolving 0.5 g of potassium hydroxide (white caustic flake, manufactured by Nippon Soda Co., Ltd.) in 10 g of purified water at room temperature was added to neutralize the mixture for 5 minutes. Stir until. Then, it ice-cooled until it became 25 degreeC, keeping stirring, and obtained the cosmetic composition.

(Evaluation methods)
(1) Appearance:
The appearance of each cosmetic composition was visually observed according to the following criteria.
A: Appearance is uniform.
B: Although some grains are confirmed, the appearance is almost uniform.
C: Appearance is uneven but not separated.
D: Appearance is uneven and the composition is separated.

(2) Viscosity (observation of layered α-gel structure):
Using a B-type viscometer VISCOMETER TVB-10 (TOKI SANGYO CO., LTD.), The viscosity at 25 ° C. was measured according to the following measurement conditions. Each cosmetic composition is measured under the conditions (i) (rotor and rotation speed). If the measured value is within the accuracy range and a stable measured value is obtained, the measured value is adopted. However, if the measurement value is out of the accuracy range or if a stable measurement value cannot be obtained due to the upper and lower limits of the accuracy range, the measurement is performed under the condition (ii). This operation is repeated to obtain a stable measurement value. Note that the measurement time of the composition at each rotation number was 1 minute.
(i) No. TC: 5 rpm
(ii) No. M4: 6 rpm
(iii) No. M2: 6 rpm
(iv) No. M1: 60 rpm

(3) Observation of layered α-gel structure (3-1) XRD (observation of α-gel structure):
For each cosmetic composition, it was confirmed by XRD whether an α-gel structure was formed. Specifically, in wide-angle X-ray diffraction, a composition in which a sharp diffraction peak appears in the vicinity of a Bragg angle = 21 to 22 ° has an α-gel structure, and is described in the table as α. Further, in the wide-angle X-ray diffraction, a composition showing two or more diffraction peaks is described in the table as β.

(3-2) Polarized light microscope image (observation of α-gel structure):
About each cosmetic composition, it confirmed whether the alpha gel structure was formed with the polarization microscope, and evaluated it on the following references | standards.
A: The entire visual field is dark, and crystals and maltese cloth are hardly observed.
B: The entire visual field is dark, and fine crystals or maltese cloth are observed in a very small part of the visual field.
C: The entire visual field is dark, and fine crystals or maltese cloth are observed in a part of the visual field.
D: Fine crystals or maltese cloth are observed in more than half of the visual field.
E: Coarse crystals or Maltese cloth are observed in the entire visual field.
In addition, in a composition in which one sharp diffraction peak appears by XRD, the result of evaluation of any of A, B, and C in the observation of a polarizing microscope image is judged as a layered α-gel structure.

(4) Properties (moist feeling):
A specialized panelist applied 0.5 to 0.6 g of each cosmetic composition while sliding the finger on the face, and evaluated the moist feeling during and after application for 3 minutes according to the following criteria. The evaluation is shown as the total value of the evaluation results of three professional panelists.
4: Good.
3: Slightly good.
2: Not very good.
1: Not good.

(5) Properties (familiarity):
When a specialist panelist applied 0.5 to 0.6 g of each cosmetic composition while sliding the finger on the face, the shortness of time until the finish was felt was evaluated according to the following criteria. The evaluation is shown as the total value of the evaluation results of three professional panelists.
4: Good.
3: Slightly good.
2: Not very good.
1: Not good.

(6) Properties (Finger finger characteristics):
Evaluate the goodness of the cosmetic composition on the fingertips (finger fingering). A 100 g beaker is filled with 100 g of cosmetic composition. A rotor M1 (φ19 mm, stainless steel rod) of a B-type viscometer VISCOMETER TVB-10 (TOKI SANGYO CO., LTD.) Is gently and horizontally brought into contact with the surface. Then, it was slowly pulled up vertically and the mass (g) of the deposited composition was measured. The average value of 3 times was calculated | required. It means that the greater the mass, the better the fingertips can be taken and the appropriate amount of the cosmetic composition can be taken easily.

(7) Residual moisture content:
The high moisturizing property of the cosmetic composition is evaluated. Weigh 5 g of the composition into a 5 cm × 5 cm plastic container (balance dish, made by ASONE, polystyrene), and smooth the surface. The initial mass and the mass after 24 hours are measured, and the residual water content (%) is calculated according to the following formula. The higher the residual water content, the higher the moisture retention.

 

 

Examples 3 to 9
A cosmetic composition having the composition shown in Table 4 was produced in the same manner as in Examples 1 and 2, and the appearance, viscosity, observation of the layered α-gel structure (XRD, polarization microscope image), and properties (thickness of fingers) were produced. evaluated. The results are also shown in Table 4.

Examples 10 to 16, Comparative Examples 6 to 8
A cosmetic composition having the composition shown in Table 5 was produced, and the appearance, viscosity, observation of the layered α-gel structure (XRD, polarization microscope image), and properties (finger properties) were performed in the same manner as in Examples 1 and 2. evaluated. The results are also shown in Table 5.

(Production method)
(1) Examples 10 to 13, 15 to 16, Comparative Examples 6 to 7:
In the same manner as in Example 1, an emulsified composition was produced.
(2) Example 14 and Comparative Example 8:
In the method for producing the emulsified composition of Example 1, the cosmetic composition of Example 1 was used except that 2 g of sodium chloride dissolved in 8 g of water was added and stirred for 5 minutes after ice cooling to 25 ° C. A cosmetic composition was produced in the same manner as in the preparation example of the cosmetic composition.

Examples 17 to 25, Comparative Example 9
A cosmetic composition having the composition shown in Table 6 was produced in the same manner as in Examples 1 and 2, and the appearance, viscosity, observation of the layered α-gel structure (XRD, polarization microscopic image), and properties (thickness of fingers) were produced. evaluated. The results are also shown in Table 6.

Examples 26 to 41, Comparative Examples 10 to 16
A cosmetic composition having the composition shown in Tables 7 and 8 was produced in the same manner as in Examples 1 and 2, and the appearance, viscosity, observation of the layered α-gel structure (XRD, polarization microscope image), and properties (fingered) Sex). The results are shown in Table 7 and Table 8.

Example 42 (gel emulsion)
(Ingredient) (mass%)
Copolymer 1 0.75
Glyceryl stearate (Excel P95 powder, manufactured by Kao Corporation) 2.75
Cetyl alcohol (Cetanol NX, manufactured by Higher Alcohol Industry) 1.5
Silicone 10cs
(Silicone KF-96A-10CS, manufactured by Shin-Etsu Chemical Co., Ltd.) 2.0
Potassium hydroxide (white caustic flakes, manufactured by Nippon Soda Co., Ltd.) 0.0075
Glycerin-containing aqueous solution (86% glycerin, manufactured by Kao Corporation, 86% by mass effective) 20
Polyethylene glycol (polyethylene glycol 1540,
Sanyo Chemical Industries, Ltd., molecular weight 1540) 3.0
Purified water balance
Total 100

(Production method)
Copolymer 1 (0.75 g), cetyl alcohol (1.5 g), and glyceryl stearate (2.75 g) were heated and dissolved at 80 ° C., and then 10 g of silicone 10 cs heated to 80 ° C. was added and stirred for 5 minutes with a propeller ( 350 rpm). Next, 20 g of a glycerin-containing aqueous solution heated to 80 ° C. is added, and while continuing stirring at 80 ° C., 0.0075 g of potassium hydroxide dissolved in 0.7425 g of water is added to neutralize it until it becomes uniform for 5 minutes. Stir. Thereafter, an aqueous phase in which 3 g of polyethylene glycol was dissolved in 69.25 g of purified water separately heated to 80 ° C. was slowly added over 15 minutes. Thereafter, the mixture was ice-cooled to 25 ° C. with stirring, and a cosmetic composition was obtained.

Example 43 (cream)
(Ingredient) (mass%)
Copolymer 1 0.75
Glyceryl stearate (Excel P95 powder, manufactured by Kao Corporation) 2.75
Cetyl alcohol (Cetanol NX, manufactured by Higher Alcohol Industry) 1.5
α-Olefin oligomer (SILKFLO 364 NF, manufactured by LIPO CHEMICALS) 2.0
Olive oil (Cropure OL-LQ- (JP), made by Croda Japan) 2.0
Neopentyl glycol dicaprate (Esthemol N-01, manufactured by Nisshin Oilio Group) 2.0
Petrolatum (Super White Protoppet, manufactured by SONNEBORN) 1.0
Silicone 10cs
(Silicone KF-96A-10CS, manufactured by Shin-Etsu Chemical Co., Ltd.) 5.0
Potassium hydroxide (white caustic flakes, manufactured by Nippon Soda Co., Ltd.) 0.0075
Glycerin-containing aqueous solution (86% glycerin, manufactured by Kao Corporation, effective mass 86% by mass) 16
1,3-butylene glycol (1,3-butylene glycol-P, manufactured by KH Neochem) 5.0
Polyethylene glycol (polyethylene glycol 1540,
Sanyo Chemical Industries, Ltd., molecular weight 1540) 3.0
Purified water balance
Total 100

(Production method)
Copolymer 1 0.75 g, cetyl alcohol 1.5 g, glyceryl stearate 2.75 g, α-olefin oligomer 2 g, olive oil 2 g, dicaprate neopentyl glycol 2 g and petrolatum 1 g were heated and dissolved at 80 ° C. 5 g of silicone 10cs heated to 80 ° C. was added, and propeller stirring was performed for 5 minutes (350 rpm). Next, 16 g of a glycerin-containing aqueous solution heated to 80 ° C. is added, and while continuing stirring at 80 ° C., 0.0075 g of potassium hydroxide dissolved in 0.7425 g of water is added to neutralize the solution until it becomes uniform for 5 minutes. Stir. Thereafter, an aqueous phase prepared by dissolving 5 g of 1,3-butylene glycol and 3 g of polyethylene glycol in 69.25 g of purified water separately heated to 80 ° C. was slowly added over 15 minutes. Thereafter, the mixture was ice-cooled to 25 ° C. with stirring, and a cosmetic composition was obtained.

The cosmetic compositions obtained in Examples 42 and 43 have viscosities of 40 Pa · s and 50 Pa · s, respectively, both of which have a layered α-gel structure, a uniform appearance, and in use. Was excellent in moist and familiar feeling, had good finger dexterity, and could easily take an appropriate amount of a cosmetic composition. In addition, the cosmetic composition of Example 43 was excellent in shape retention without being spilled from the container even when tilted by 45 degrees in the container.

Claims (7)

A cosmetic composition comprising the following components (A), (B) and (C), and having a viscosity at 25 ° C. of 1.5 Pa · s or more.
(A) the structural unit (a) represented by the general formula (1), the structural unit (b) represented by the general formula (2), and the structural unit (c) represented by the general formula (3),
In the copolymer, the structural unit (a) is contained in an amount of 1% by mass to 23% by mass,
A copolymer having a mass ratio of the structural unit (c) to the structural unit (b) (structural unit (c) / structural unit (b)) of 0.19 to 2.2;

(Wherein R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ and R ⁹ are the same or different and each represents a hydrogen atom or an alkyl group having 1 to 2 carbon atoms; R ¹⁰ represents an alkylene group having 2 to 4 carbon atoms, R ¹¹ represents a linear or branched alkyl group or alkenyl group having 1 to 30 carbon atoms, X ¹ represents OM or NHC (CH ₃ ) ₂ CH ₂ SO ₂ M (M represents a hydrogen atom or a cation group), X ² represents NR ¹² R ¹³ (R ¹² and R ¹³ each have 1 or 2 carbon atoms which may have a hydrogen atom or a hydroxy group) Represents an alkyl group, except that R ¹² and R ¹³ are simultaneously a hydrogen atom) or OR ¹⁴ (R ¹⁴ represents a C 2 or C 3 alkyl group having a hydroxy group), and X ³ represents oxygen Represents an atom or NH, and n represents an integer of 0 to 3.)
(B) an oil component containing at least one selected from the following (B1) to (B5):
(B1) one or more selected from glycerin monofatty acid esters having 14 or more carbon atoms and sorbitan difatty acid esters having 14 or more carbon atoms,
(B2) glycerol monoalkyl ether having 14 or more carbon atoms,
(B3) a higher alcohol having 14 or more carbon atoms,
(B4) a higher fatty acid having 14 or more carbon atoms,
(B5) Ceramides,
(C) Water The cosmetic composition according to claim 1, wherein the component (B) contains at least one selected from (B1) a glycerin monofatty acid ester having 14 or more carbon atoms and a sorbitan difatty acid ester having 14 or more carbon atoms. Component (B) is further selected from (B2) glycerol monoalkyl ether having 14 or more carbon atoms, (B3) higher alcohol having 14 or more carbon atoms, (B4) higher fatty acid having 14 or more carbon atoms, and (B5) ceramides. The cosmetic composition according to claim 2, comprising one or more selected from the above. The cosmetic composition according to any one of claims 1 to 3, wherein the content of the structural unit (b) is 30% by mass or more and 80% by mass or less in the copolymer of the component (A). The cosmetic composition according to any one of claims 1 to 4, wherein the content of the structural unit (c) in the copolymer of the component (A) is 15% by mass or more and 65% by mass or less. The cosmetic composition according to any one of claims 1 to 5, wherein, in the copolymer of the component (A), in the structural unit (c), R ¹¹ is an alkyl group or an alkenyl group having 4 to 22 carbon atoms. . The cosmetic composition according to any one of claims 1 to 6, which has an α-gel structure.

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