JP2010132620A - Water-in-oil type emulsified cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-in-oil type emulsified cosmetic that has a high internal water phase ratio to allow good serviceability and exhibits good emulsion stability though it is a water-in-oil type solid emulsified cosmetic exhibiting good makeup sustainability and having a refreshing feeling to the skin. <P>SOLUTION: The water-in-oil type emulsified cosmetic contains the following components (A), (B), (C) and (D), and satisfies the requirements (1) and (2) below. Components: (A) one or two or more selected from among glycerin monooleate, glycerine monoisostearate and polyoxyethylene glyceryl monostearate; (B) an aqueous component; (C) an oily component; and (D) a powder. Requirements: (1) The internal water phase ratio which is obtained by dividing the sum of the mass of the component (A) and the component (B), the aqueous component, by the sum of the mass of the component (A), the component (B), the aqueous component, and the component (C), the oily component, is at least 50%. (2) For the component (A), the purity of glycerine monooleate is at least 90 mass% based on the total amount of glycerin monooleate, glycerine dioleate and glycerine trioleate; the purity of glycerine monoisostearate is at least 90 mass% based on the total amount of glycerine monoisostearate, glycerine diisostearate and glycerine triisostearate; and the purity of polyoxyethylene glyceryl monostearate is at least 90 mass% based on the total amount of polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl distearate and polyoxyethylene glyceryl tristearate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water-in-oil emulsified cosmetic, and particularly relates to the realization of a high internal water phase ratio in a water-in-oil emulsion and the accompanying improvement in emulsion stability.

  The emulsified compositions are roughly classified into an oil-in-water type (O / W) and a water-in-oil type (W / O), and further, an oil-in-water type (O / W / O), a water-in-oil-in-water type ( There are also multiple types such as (W / O / W). These have been conventionally used in skin care creams, emulsions, hair care creams, etc. in the cosmetics field, and as transdermal creams, etc. in the pharmaceutical field.

  Among them, a water-in-oil type emulsion composition in which the oil phase is the outer phase and the water phase is the inner phase efficiently contains oil-soluble active ingredients such as emollient oil, oil-soluble drugs, and UV absorbers on the skin. Since it can be developed, it is a dosage form suitable as a skin external preparation, and is superior to the oil-in-water type in this respect.

  The ratio of the inner aqueous phase obtained by dividing the amount of the inner aqueous phase component by the total emulsified composition has a great influence on the properties of the emulsion, and also in the cosmetics containing the emulsion. Specifically, in a water-in-oil emulsified composition utilized for creams and the like, it is possible to give a refreshing good feeling when the internal water phase ratio is increased, and oily when the internal water phase ratio is low It feels.

  In a normal water-in-oil emulsion composition, when the internal water phase ratio is increased, it becomes difficult to maintain stability at around 60%. This is because the water molecules that make up the emulsified particles in the inner aqueous phase migrate and are absorbed by other emulsified particles (Ostwal Dryening), and the emulsified particles are more This is because coalescence of the emulsified particles occurs due to a significant increase in the collision frequency. Therefore, it was difficult to stabilize the emulsion at an internal water phase ratio exceeding 70%, which is around the fine packing ratio (74%) of the hard spheres. In addition, since the emulsification system is thermodynamically non-equilibrium, in order to stabilize it so that it can be used industrially, the amount of emulsifier, the ratio of the internal water phase, the type and amount of the aqueous component, the oil content There were limitations on the use of types and amounts, types and amounts of other stabilizers.

  That is, it has been difficult to provide a water-in-oil emulsion composition having a high moisturizing effect on the skin, having a high internal water phase ratio suitable for enhancing usability and maintaining good stability. .

  On the other hand, by using polyether-modified silicone as an emulsifier, water-in-oil emulsified cosmetics with high stability and high internal water phase ratio have been developed (see, for example, Patent Document 1 and Patent Document 2). In this method, it is recommended to use a polyether-modified silicone having a high molecular weight (30000 or more). However, polyether-modified silicone usually exhibits a behavior as a polymer surfactant and has a problem of giving a sticky feeling due to entanglement of polymer chains.

  Further, a water-in-oil emulsion composition having a high internal water phase ratio has been developed by mainly using sucrose polyester as a surfactant (see, for example, Patent Document 3). However, emulsified cosmetics prepared using a sugar surfactant tend to give a generally sticky feeling to use. In particular, when emulsion preparation is performed using sucrose fatty acid polyester, it is clear from the fact that liquid crystals are easily formed from a low concentration compared to polyoxyethylene nonionic surfactants frequently used in the cosmetics field. The hydration power was strong and sticky, and the refreshing feeling was not sufficient.

  Furthermore, there is a technique for obtaining a water-in-oil emulsion composition having a high internal water phase ratio using a partially hydrophilized polysiloxane crosslinked product and applying it to cosmetics (see, for example, Non-Patent Document 1). When preparing an emulsion by this method, there has been a problem that the emulsified composition is easily destabilized by blending oil other than cyclic silicone, nonpolar oil, polar oil, linear silicone and the like. In particular, it is difficult to blend non-polar oils, and there are significant restrictions on the blending of oils as components useful for the skin, and there are functional limitations such as effects on the skin, UV protection, and restrictions on the feeling of use.

In addition, a water-in-oil emulsion composition having a high internal water phase ratio has been developed by using glyceryl monooleate (Patent Document 4). However, depending on the oil component used, there are some that cannot maintain good emulsification stability.
JP 2001-89356 A JP 2002-201355 A JP 9-239259 A JP 2007-153824 A Satsuki Kuribayashi, Oreoscience Vol.1. No.3, 247-254 (2001)

As a result of devising the surfactant used to increase the internal water phase ratio, the conventional method has a sticky feeling and has a problem in usability, and is stable while maintaining a high internal water phase ratio. In order to maintain the quality, there are restrictions on the types of oils to be blended, and the quality when used as cosmetics is not always satisfactory.
The present invention has been made in view of the above-mentioned problems of the prior art, and is a water-in-oil solid emulsified cosmetic that has a good makeup and has a refreshing feeling on the skin. It is an object of the present invention to provide a water-in-oil type emulsified cosmetic that is of a specific ratio and has very good emulsification stability.

  As a result of intensive studies to solve the above-mentioned problems by the present inventors, mixing by using an oily component containing a polar oil as a specific component, the emulsion stability is very good, and the makeup lasts well. It was found to be excellent in usability because it had a refreshing feeling on the skin and had a high internal water phase ratio, and the present invention was completed.

  That is, the first subject of the present invention includes the following components (A), (B), (C), and (D), and further satisfies the following conditions (1) and (2): It is an emulsified cosmetic. Ingredients: (A) one or more selected from glyceryl monooleate, glyceryl monoisostearate, polyoxyethylene glyceryl monostearate, (B) aqueous component, (C) oil component, (D) powder, conditions : (1) The internal water phase ratio obtained by dividing the mass of the aqueous component of component (B) by the sum of the mass of the aqueous component of component (B) and the oily component of component (C) is 50% or more . (2) The purity of component (A) glycerol monooleate is 90% by mass or more based on the total amount of glycerol monooleate, glycerol dioleate, and glycerol trioleate, and the purity of glycerol monoisostearate is mono 90 mass% or more based on the total amount of glyceryl isostearate, glyceryl diisostearate, and glyceryl triisostearate, and the purity of polyoxyethylene glyceryl monostearate is polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl distea It is 90 mass% or more with respect to the total amount of a rate and polyoxyethylene glyceryl tristearate.

  In addition, it is preferable that the water-in-oil emulsified cosmetic further contains (E) tetramethyltrihydroxyhexadecane.

Moreover, it is suitable for the said water-in-oil type emulsion cosmetics that the mass of a component (A) is 0.8-4.0 mass% with respect to the total mass.
In the water-in-oil emulsified cosmetic, the component (C) oily component preferably contains octyl methoxycinnamate and / or castor oil.
In the water-in-oil emulsified cosmetic, it is preferable that the mass of the polar oil contained in the component (C) is 0.5 to 5.0% by mass with respect to the total mass.
In the water-in-oil emulsified cosmetic, the mass of the component (D) powder is preferably 10 to 30% by mass relative to the total amount of the cosmetic.

The water-in-oil emulsified cosmetic according to the present invention contains (A) glyceryl monoisostearate with few impurities, (C) an oil component containing a polar oil, and (D) a powder in a specific ratio. The water-in-oil emulsified cosmetic composition having a good makeup, a high internal water phase ratio with good usability and excellent emulsification stability can be provided.
Furthermore, by adding (E) tetramethyltrihydroxyhexadecane, the emulsion stability is further improved.

  The water-in-oil emulsified cosmetic according to the present invention comprises (A) one or more selected from glyceryl monooleate, glyceryl monoisostearate, and polyoxyethylene glyceryl monostearate, (B) an aqueous component, ( C) a polar oil component, (D) composed of powder, and (1) the mass of the aqueous component of component (B) is divided by the sum of the mass of the aqueous component of component (B) and the oil component of component (C) This satisfies the condition that the internal water phase ratio obtained is 50% or more and the purity of the component (2) (A) is 90% by mass or more. Hereinafter, each component will be described in detail.

Ingredient (A)
Glycerol monooleate can be provided by various known synthetic methods. According to the usual synthesis method, it is produced as a mixture of glyceryl monooleate, glycerin dioleate, and glyceryl trioleate. The component (A) glyceryl monooleate constituting the water-in-oil emulsified cosmetic according to the present invention preferably has a high purity. As a purification method of glyceryl monooleate, a molecular distillation method is usually used, but is not limited thereto.

  The glycerin fatty acid diester and glycerin fatty acid triester contained as impurities of monooleic acid are less than 10% by mass relative to the total amount of component (A). While glyceryl monooleate has a function as a surfactant (emulsifier), glycerin dioleate and glycerin trioleate behave as oils. Therefore, when the purity of glyceryl monoleate is low, the emulsion behaves as if glycerin dioleate and glyceryl trioleate were blended as oil components in addition to the oil component of component (D). That is, the purity of glyceryl monooleate is low and the glycerin fatty acid diester and / or glycerin fatty acid triester contained as an impurity of the component (A) as a kind of oil blended as the oil component of the component (D) When it exceeds 10 mass% with respect to the whole quantity of (A), stability of an emulsion will be impaired.

  Also, glyceryl monoisostearate can be provided by various known synthetic methods. According to the usual synthesis method, it is produced as a mixture of glyceryl monoisostearate, diisosteeric glycerin, and glyceryl triisostearate. The component (A) glyceryl monoisostearate constituting the water-in-oil emulsified cosmetic according to the present invention preferably has a high purity. As a purification method of glyceryl monoisostearate, a molecular distillation method is usually used, but is not limited thereto.

  Therefore, even when the purity of glyceryl monoisostearate is low, the emulsion behaves as if glycerin diisostearate and glyceryl triisostearate were blended as oil components in addition to the oil component of component (C). That is, the purity of glyceryl monoisostearate is low, and glycerin fatty acid diester and / or glycerin fatty acid triester contained as an impurity of component (A) as a kind of oil blended as an oil component of component (C) When it exceeds 10 mass% with respect to the whole quantity of (A), stability of an emulsion will be impaired.

  Polyoxyethylene glyceryl monostearate can be provided by various known synthetic methods. According to the usual synthesis method, it is produced as a mixture of polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl distearate and polyoxyethylene glyceryl tristearate. The polyoxyethylene glyceryl monostearate of the component (A) constituting the water-in-oil emulsified cosmetic according to the present invention desirably has a high purity, and as a kind of oil component blended as the oil component of the component (C), Moreover, when the glycerol fatty acid diester and / or glycerol fatty acid triester contained as an impurity of a component (A) exceeds 10 mass% with respect to the whole quantity of a component (A), stability of an emulsion will be impaired. As a method for purifying polyoxyethylene glyceryl monostearate, a molecular distillation method is usually used, but is not limited thereto.

  The purity of component (A) glyceryl monooleate, glyceryl monoisostearate, and polyoxyethylene glyceryl monostearate is determined by gas chromatography (GC), gel permeation chromatography (GPC), and high performance liquid chromatography (HPLC). It can measure by general methods, such as.

  In addition, as a suitable compounding quantity of a component (A) glycerol monooleate, glycerol monoisostearate, polyoxyethylene glyceryl monostearate, 0.8-4.0 mass%, More preferably, it is 1-2 mass%. is there. If it is 0.8% by mass or less, the stability of the emulsion may be remarkably impaired, and if it exceeds 4.0% by mass, the usability may be inferior.

Ingredient (B)
As the aqueous component, those which can be usually used for cosmetics, pharmaceuticals and the like can be blended within a range that does not impair the stability of the emulsion. Examples of the humectant include 1,3-butylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, hexylene glycol, glycerin, diglycerin, xylitol, maltitol, maltose, D-mannitol, and the like. Examples of water-soluble polymers include plant polymers such as gum arabic, carrageenan, pectin, agar, quince seed (malmello), starch, and alge colloid (brown algae extract), microbial polymers such as dextran and pullulan, collagen, and casein. Animal polymers such as gelatin, starch polymers such as carboxymethyl starch and methylhydroxypropyl starch, alginic acid polymers such as sodium alginate, vinyl polymers such as carboxyvinyl polymer (such as CARBOPOL), polyoxyethylene Polymers, polyoxyethylene polyoxypropylene copolymer polymers, acrylic polymers such as sodium polyacrylate and polyacrylamide, inorganic water-soluble polymers such as bentonite, aluminum magnesium silicate, and laponite That.
Examples of UV absorbers include benzoic acid UV absorbers such as paraaminobenzoic acid, anthranilic acid UV absorbers such as methyl anthramylate, salicylic acid UV absorbers such as octyl salicylate and phenyl salicylate, isopropyl paramethoxycinnamate, Cinnamic acid UV absorbers such as octyl paramethoxycinnamate and glyceryl di-2-methoxycinnamate mono-2-ethylhexanoate, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2- Benzophenone ultraviolet absorbers such as hydroxy-4-methoxybenzophenone-5-sulfonic acid, urocanic acid, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 4-tert-butyl-4′-methoxybenzoyl There is methane.

Examples of the sequestering agent include sodium edetate, sodium metaphosphate, phosphoric acid and the like.
Examples of the antioxidant include ascorbic acid, α-tocopherol, dibutylhydroxytoluene, butylhydroxyanisole and the like.
The drugs include vitamin A oil, retinol, retinol palmitate, inosit, pyridoxine hydrochloride, benzyl nicotinate, nicotinamide, nicotinic acid DL-α-tocopherol, magnesium ascorbate phosphate, 2-glucoside ascorbate, vitamin D2 ( Ergocassipherol), dl-α-tocopherol 2-L potassium ascorbate diester potassium salt, dl-α-tocopherol, acetic acid dl-α-tocopherol, pantothenic acid, vitamins such as biotin, anti-inflammatory such as allantoin and azulene Agents, whitening agents such as arbutin, astringents such as zinc oxide and tannic acid, sulfur, lysozyme chloride, pyridoxine hydrochloride, γ-oryzanol and the like.
In addition to the above drugs being used in a free state, those capable of salt formation can be used in the form of an acid or base salt, and those having a carboxylic acid group can be used in the form of its ester.

Ingredient (C)
The oil component contains a solid oil component, and can be used for cosmetics and pharmaceuticals as long as the stability of the emulsion is not impaired. The liquid oil is preferably silicone oil, more preferably cyclic silicone oil. Examples of silicone oils include chain silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, and octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane. There are typical cyclic silicone oils.
Nonpolar oils include hydrocarbon oils typified by liquid paraffin, squalane, squalene, paraffin, isoparaffin, isododecane, isohexadecane and the like.

  Solid oils contained in the oil component include cocoa butter, coconut oil, horse oil, hydrogenated coconut oil, palm oil, beef tallow, sheep fat, hydrogenated castor oil, and the like, paraffin wax (linear hydrocarbon), micro Hydrocarbons such as crystallin wax (branched saturated hydrocarbon), ceresin wax, mole, montan wax, Fischer-Trops wax, beeswax, lanolin, carnauba wax, candelilla wax, rice bran wax (rice wax), gay wax, jojoba oil, Nukarou, Montanrou, Kapokrou, Bayberry wax, shellac wax, sugarcane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, hard lanolin, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether Lanolin fatty acid polyethylene glycol, waxes such as POE hydrogenated lanolin alcohol ether, higher fatty acids such as myristic acid, palmitic acid, stearic acid, behenic acid, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, cetostearyl alcohol, etc. Higher alcohol can be raised.

  In the water-in-oil emulsified cosmetic of the present invention, the emulsion stability is improved by further blending a polar oil component in the (C) oil component. The polar oil is preferably octyl methoxycinnamate and castor oil.

  In addition, as a suitable compounding quantity of an octyl methoxycinnamate contained in a component (C) oil-based component, and a castor oil, it is 0.5-5 mass% with respect to cosmetics whole quantity, Preferably it is 1-3 mass%. . If it is 0.5% by mass or less, the stability of the emulsion may be remarkably impaired, and if it exceeds 5% by mass, the usability may be inferior.

  The internal water phase ratio of the water-in-oil emulsified cosmetic in the present invention is 50% or more. When the internal water phase ratio is less than 50%, a refreshing feeling may not be obtained. Furthermore, in the present invention, it is possible to prepare a water-in-oil emulsified cosmetic having a high internal water phase ratio of 60% or more, and a refreshing feeling of use can be provided. The internal water phase ratio is calculated by dividing the mass of (B) the aqueous component by the total mass of (A) component, (B) aqueous component, and (C) oil component.

Ingredient (D)
Examples of the powder include inorganic powders (for example, talc, kaolin, sericite, muscovite, synthetic mica, phlogopite, saucite, biotite, lithia mica, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate, silicic acid. Calcium, aluminum silicate, barium silicate, strontium silicate, metal tungstate, silica, hydroxyapatite, zeolite, boron nitride, ceramic powder, etc .; organic powder (for example, polyamide resin powder (nylon powder), polyethylene powder, Polymethyl methacrylate powder, polystyrene powder, copolymer resin powder of styrene and acrylic acid, benzoguanamine resin powder, polytetrafluoroethylene powder, cellulose powder, etc.); inorganic white pigment (for example, zinc oxide); inorganic red type Pigments (eg titanic acid Inorganic purple pigments (eg, mango violet, cobalt violet, etc.); inorganic green pigments (eg, chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (eg, ultramarine blue, bitumen, etc.) Pearl pigments (eg, titanium oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (eg, aluminum powder, copper powder, etc.) ); Organic pigments such as zirconium, barium or aluminum lake (for example, red 201, red 202, red 204, red 205, red 220, red 226, red 228, red 405, orange 203) , Orange 204, Yellow 205, Yellow 401 And organic pigments such as Blue No. 404, Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow 202, yellow 203, green 3 and blue 1); natural pigments (for example, chlorophyll, β-carotene and the like) and the like.

  In addition, as a suitable compounding quantity of a component (D) powder component, it is 10-30 mass% with respect to the composition whole quantity, More preferably, it is 15-20 mass%. If it is 10% by mass or less, the covering force may be insufficient, and if it exceeds 30% by mass, the spread may become heavy.

Ingredient (E)
Component (E), tetramethyltrihydroxyhexadecane (trade name: phytantriol) has four branched chains. The property that these structures bring about during emulsion purification includes prevention of crystallization at low temperatures.

  Further, the water-in-oil emulsified cosmetic of the present invention can be widely applied to makeup cosmetics conventionally applied to skin, eyebrows, eyelashes, lips, etc., for example, foundations, eye shadows, eye liners. And mascara.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Unless otherwise specified, the blending amount is expressed in mass% with respect to the system in which the component is blended.

Preparation method of water-in-oil type emulsified cosmetic (foundation) One or more kinds selected from glyceryl monooleate, glyceryl monoisostearate, polyoxyethylene glyceryl monostearate, oil component and other oil-soluble component are mixed And heated to about 80 ° C. to dissolve. Disperse the powder in the oil component. The aqueous component and other water-soluble components are mixed, dissolved, and heated to 80 ° C. The water-soluble component parts are gradually added while stirring the oil-soluble component parts relatively strongly.

Evaluation method of water-in-oil type emulsified cosmetics For the compositions shown in Tables 1 to 5 below, emulsion stability and usability were evaluated based on the following evaluation criteria.
1. Emulsion stability after one week at room temperature Stability was visually evaluated after storage for one week at room temperature.
A: Separation of water and / or oil is not observed at all.
○: Slight separation of water and / or oil is observed.
X: Separation of water and / or oil is clearly observed.

2. Usability The usability was evaluated by 10 professional panels.
A: Evaluated that 9 or more of 10 people are fresh and refreshing.
○: Evaluated as 7 to 8 out of 10 people being fresh and refreshing.
Δ: Evaluated that 4 to 6 out of 10 people were fresh and refreshing.
X: It is evaluated that 3 or less of 10 people are fresh and refreshing.

（＊）：テトラメチルトリヒドロキシヘキサデカン

(*): Tetramethyltrihydroxyhexadecane

As is clear from the results shown in Table 1, in Test Example 1-9 using a surfactant other than the component (A) of the present invention, the emulsion stability is inferior, and the usability is also satisfactory. I couldn't get anything better.
On the other hand, the constituent requirements (A) polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl distearate, and polyoxyethylene glyceryl tristearate of the present invention are used as surfactants in Test Examples 1-1 to 1-1, respectively. In 1-3, it was possible to prepare a stable W / O type solid emulsion having an excellent feeling of use. In addition, Test Examples 1-4 to 1-7 in which polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl distearate, and polyoxyethylene glyceryl tristearate are used in the same manner as when used alone. And a W / O type solid emulsion excellent in emulsion stability could be prepared.
In Test Example 1-8 in which glyceryl monooleate and phytantriol were used in combination, an even more stable W / O emulsion could be prepared, and the usability was also good.

From the above results, the surfactant used in the water-in-oil emulsified cosmetic of the present invention is one or more selected from glyceryl monooleate, glyceryl monoisostearate, and polyoxyethylene glyceryl monostearate. It is understood that it is preferable to prepare a W / O emulsion having a high internal water phase ratio and maintaining good stability.
Subsequently, the present inventors examined a suitable internal water phase ratio in producing the water-in-oil emulsified cosmetic of the present invention.

（＊）：テトラメチルトリヒドロキシヘキサデカン

(*): Tetramethyltrihydroxyhexadecane

As shown in Table 2, in Test Examples 2-1 to 2-4, the blending ratio of (B) aqueous component and (C) oil component was changed as appropriate, and the respective emulsion stability, usability, and The evaluation of phase equilibrium was studied.
As a result, when the ion-exchanged water of component (B) and the oil component (C) were adjusted so that the internal water phase ratio was 50% or more (Test Examples 2-1 to 2-3), it was particularly excellent. It became clear that stability was obtained.
In addition, when the internal water phase ratio was prepared lower than 50% (Test Example 2-4), the stability was slightly lowered.
As described above, it is understood that the water-in-oil solid makeup cosmetic of the present invention is preferably prepared so that the internal water phase ratio is 50% or more.
Then, the present inventors examined the suitable compounding quantity of (A) component used for preparation of the water-in-oil type emulsion cosmetics of this invention.

（＊）：テトラメチルトリヒドロキシヘキサデカン

(*): Tetramethyltrihydroxyhexadecane

As shown in Table 3, in Test Examples 3-1 to 3-3, the blending amount of glycerin monoisostearate as the component (A) was appropriately changed, and each emulsion stability was examined.
As a result, it was found that when glyceryl monoisostearate was blended in the range of 0.8 to 4.0% by mass, excellent usability and emulsion stability were obtained.

In Table 3, glyceryl monoisostearate was used as the component (A), but when glyceryl monooleate and polyoxyethylene glyceryl monostearate were used alone, or two or more of these were used. Similar results were obtained in some cases.
Subsequently, the present inventors examined the relationship between the purity of the component (A) used for the preparation of a water-in-oil emulsified cosmetic with a high internal water phase ratio and the emulsion stability.

（＊）：テトラメチルトリヒドロキシヘキサデカン

(*): Tetramethyltrihydroxyhexadecane

As shown in Table 4 above, the amount of glyceryl monoisostearate is 2% by mass, the purity is adjusted to 90% by mass, and 30% by mass, and the purity is determined as the emulsion stability of the water-in-oil emulsion cosmetic. The effect on the feeling of use was examined.
As a result, when the purity of glyceryl monooleate and glyceryl monoisostearate was 90% by mass (Test Example 4-1), the cosmetic was excellent in emulsion stability and feeling of use, but the purity was 30%. % (Test Example 4-2), when the purity of the component (A) was low, the emulsion stability tended to be further reduced. In addition, although the same examination was performed about glyceryl monooleate and polyoxyethylene glyceryl monostearate, when the purity was 90 mass%, it became the cosmetics excellent in emulsion stability.
Next, the present inventors have further investigated the oil component used for maintaining a better emulsion stability while being a water-in-oil emulsion cosmetic having a high internal water phase ratio.

（＊）：テトラメチルトリヒドロキシヘキサデカン

(*): Tetramethyltrihydroxyhexadecane

As shown in Table 5, (C) the oily component was fixed to decamethylcyclopentasiloxane and rice bran wax and adjusted to a composition in which other oily components were changed, and the respective emulsion stability and usability were examined.
As a result, when octyl methoxycinnamate, which is a polar oil, and refined castor oil are used (Test Examples 5-1 to 5-4), it is found that the cosmetic is further excellent in emulsion stability and use feeling. It was. Further, it was found that even when isostearic acid and sorbitan sesquiisostearate were used in combination (Test Examples 5-5 and 5-6), the cosmetic composition was excellent in emulsion stability and use feeling.
From the above results, when (C) octyl methoxycinnamate and refined castor oil were used as oil components, and when isostearic acid and sorbitan sesquiisostearate were used in combination, better stability was maintained. It is understood that it is preferred for the preparation of W / O type emulsions.
Then, the present inventors examined the suitable compounding quantity of (C) oil-based component used for preparation of the water-in-oil type emulsion cosmetics of this invention.

As shown in Table 6, in Test Examples 6-1 to 6-8, the blending amount of octyl methoxycinnamate, which is the polar oil component of component (C), is appropriately changed to examine the respective emulsion stability and the like. did.
As a result, when blended in the range of 0.5 to 5.0% by mass (Test Examples 6-3 to 6-6), the feeling of use and the emulsion stability tend to be excellent, but in particular 1 to 3% by mass. % (Test Examples 6-4 to 6-6), it was found that a better feeling of use was obtained.
Furthermore, the present inventors have studied the types of powders to be blended in preparing a water-in-oil emulsified cosmetic with a high internal water phase ratio and excellent emulsification stability.

（＊）：テトラメチルトリヒドロキシヘキサデカン

(*): Tetramethyltrihydroxyhexadecane

  As shown in Table 7, in the water-in-oil emulsified cosmetic of the present invention, the types of powders that can be blended are very wide. In addition to the foundation, an eyeliner base (Test Example 7-3), eye shadow It was found that application to various fields such as (Test Example 7-4) is also possible.

Claims (6)

A water-in-oil emulsified cosmetic comprising the following components (A), (B), (C), and (D) and further satisfying the following conditions (1) and (2):
Component: (A) One or more selected from glyceryl monooleate, glyceryl monoisostearate, polyoxyethylene glyceryl monostearate (B) Aqueous component (C) Oil component (D) Powder condition: (1) 50% of the internal water phase ratio obtained by dividing the sum of the mass of the aqueous component of component (B) by the sum of the mass of the aqueous component of component (A), component (B), and the oily component of component (C) That's it.
(2) The purity of component (A) glycerol monooleate is 90% by mass or more based on the total amount of glycerol monooleate, glycerol dioleate, and glycerol trioleate,
The purity of glyceryl monoisostearate is 90% by mass or more based on the total amount of glyceryl monoisostearate, glyceryl diisostearate, and glyceryl triisostearate;
The purity of polyoxyethylene glyceryl monostearate is 90% by mass or more based on the total amount of polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl distearate, and polyoxyethylene glyceryl tristearate.   The water-in-oil emulsified cosmetic according to claim 1, further comprising (E) tetramethyltrihydroxyhexadecane.   The water-in-oil emulsified cosmetic according to claim 1 or 2, wherein the mass of the component (A) is 0.8 to 4.0% by mass relative to the total mass. Cosmetics.   The water-in-oil type emulsified cosmetic according to any one of claims 1 to 3, wherein the oil component (C) contains octylmethoxycinnamate and / or castor oil. Cosmetics.   The water-in-oil emulsified cosmetic according to claim 4, wherein the mass of octylmethoxycinnamate and / or castor oil contained in component (C) is 0.5 to 5.0 mass% with respect to the total mass. A water-in-oil emulsified cosmetic, characterized by being.   The water-in-oil emulsified cosmetic according to any one of claims 1 to 5, wherein the weight of the component (D) powder is 10 to 30% by mass relative to the total amount of the cosmetic. Water-type emulsified cosmetic.