JP5088979B1 - Oil-in-water emulsified skin cosmetic - Google Patents

Abstract

[Problem] To provide a skin cosmetic that has good spread and familiarity to the skin, is non-sticky, and is extremely excellent in use feeling such as freshness, penetrating feeling, emollient feeling and stickiness.
An oil-in-water emulsified skin cosmetic comprising the following components (A) to (D).
(A) Glyceryl tricaprylate (B) Polyethylene glycol monostearate (100 mol polyoxyethylene adduct), polyethylene glycol monostearate (120 mol polyoxyethylene adduct), polyethylene glycol monostearate (150 mol polyoxyethylene) 1 or 2 or more types selected from the group consisting of adducts) (C) In a composition using an organic solvent or oil as a dispersion medium and water as a dispersed phase, the water-soluble ethylenically unsaturated monomer is dissolved in the dispersed phase. A microgel obtained by radical polymerization in a dispersed phase, wherein the microgel forms a one-phase microemulsion or a fine W / O emulsion with a surfactant under the condition that dimethylacrylamide and 2-acrylamide- 2-methylpropanesulfo Thickener consisting of a microgel obtained by the acid radical polymerization (D) water .BACKGROUND

Description

  The present invention relates to a skin cosmetic. More particularly, the present invention relates to an oil-in-water emulsified skin cosmetic that has good spread and familiarity to the skin, is non-sticky, and is extremely excellent in use feeling such as freshness, penetrating feeling, emollient feeling, and stickiness.

Conventionally, oil-in-water emulsified skin cosmetics have higher fatty acids such as stearic acid, palmitic acid, myristic acid, behenic acid, petrolatum, etc. in order to produce a moist, rich, smooth and emollient feeling. A technique has been adopted in which solid oils such as waxes such as carnauba wax, candelilla wax, ceresin and microcrystalline wax, and higher alcohols such as lauryl alcohol, myristyl alcohol, palmityl alcohol, stearyl alcohol and behenyl alcohol are emulsified as emulsifiers. . In order to suppress crystallization of these solid oils over time, hydrocarbon oils that are liquid at room temperature such as liquid paraffin and squalane that are compatible with the solid oils, cetyl palmitate, isopropyl isostearate, isodecyl pivalate Attempts have been made to avoid crystal precipitation of solid oil by blending ester oil having a relatively long carbon chain, such as oleyl oleate, with a carbon chain comparable to that of solid oil. (For example, refer nonpatent literature 1).
However, the oil-in-water emulsified skin cosmetics prepared by the method as described above have emollient and sticky feelings when applied to the skin, but they are not well-suited to the spread and skin, are sticky, and are easy to use. The point was not satisfactory.
On the other hand, when no solid oil is blended, there is a problem in that there is no emollient feeling or stickiness, although it is excellent in terms of spreading and skin familiarity and no stickiness.

On the other hand, water-soluble thickeners that can be used for skin cosmetics include various polysaccharides, natural polymers such as gelatin, synthetic polymers such as polyoxyethylene and cross-linked poly (meth) acrylic acid, montmorillonite, and silica. Examples include inorganic minerals. Among these, cross-linked poly (meth) acrylic acid is particularly inexpensive and has a high thickening effect and gels in a small amount. Therefore, it is frequently used as a water-soluble thickener or stabilizer in the cosmetic industry, especially skin cosmetics. Has been.
Specifically, the most widely used thickener for cosmetics at present is a polymer of acrylic acid collectively called carboxyvinyl polymer, and the product name is “Hibiswako” (Wako Pure Chemical Industries, Ltd.). ), “Sintalen” (3V SIGMA), “Apeck” (Sumitomo Seika Co., Ltd.), “Carbopol” (Lublizol), and the like.
Such an aqueous dispersion of a crosslinked polymer has a very high thickening effect and is widely used as a thickener for cosmetics (see, for example, Patent Document 1).
However, when a skin cosmetic is prepared using this carboxyvinyl polymer, it has a disadvantage that a unique feeling of slipping occurs and the skin becomes unfit.

In order to solve this problem, in recent years, a copolymer of acrylamide alkyl sulfonic acid and (meth) acrylic acid (see, for example, Patent Document 2), a copolymer of acrylamide alkyl sulfonic acid and an alkyl group-containing unsaturated monomer are used. Polymers (for example, see Patent Document 3) or 2-acrylamido-2-methylpropanesulfonic acid homopolymer (for example, see Patent Document 4) are applied to skin cosmetics.
However, when these materials are used, an excellent skin conformity, non-stickiness, and emollient effect can be obtained, but the feeling of elasticity is not fully satisfactory.

In general, when preparing an oil-in-water emulsified skin cosmetic, POE hydrogenated castor oil (POE60), POE behenyl ether (POE30), POE glyceryl monostearate (POE40), polyethylene glycol monostearate (POE40) Hydrophilic surfactants such as are used.
However, when these hydrophilic surfactants are used, they are not well-suited to the spread and skin, are sticky, and are inferior in the feeling that the active ingredient penetrates into the skin (penetration feeling).

JP-A-8-99855 JP-A-9-157130 JP-A-10-279636 JP-A-10-67640

“Latest Cosmetic Science” (Revised Supplement II) edited by Japan Society of Engineers, Yakuji Nippo, published on July 10, 1992, p. 49

  In the case of producing an oil-in-water emulsified skin cosmetic by the above-described technique, the inventor has excellent stability over time, but is poorly applied to the skin and skin, and is sticky, fresh, and the active ingredient is skin. As a result of intensive research in view of the problems of penetrating into the skin (penetration feeling), emollient feeling and inferior feeling, (A) glyceryl tricaprylate, (B) polyethylene glycol monostearate (100 mol polyoxy) Ethylene adduct, hereinafter, polyoxyethylene is abbreviated as POE and may be abbreviated as POE100), polyethylene glycol monostearate (120 mol polyoxyethylene adduct, hereinafter, polyoxyethylene is abbreviated as POE, abbreviated as POE120) Polyethylene glycol monostearate (150 mol polyoxyethylene) Additive, hereinafter, polyoxyethylene is abbreviated as POE, and may be abbreviated as POE150), or (C) an organic solvent or an oil component as a dispersion medium, and water as a dispersion phase. In the composition, a microgel obtained by dissolving a water-soluble ethylenically unsaturated monomer in a dispersed phase and radical polymerization in the dispersed phase, wherein the microgel is a one-phase microemulsion or a fine W / If an oil-in-water emulsified skin cosmetic is prepared using a thickener composed of a microgel obtained by radical polymerization of dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid under the conditions to form an O emulsion For example, it spreads well on the skin, does not feel sticky, freshness, and the active ingredient permeates the skin (permeability) Moriento sense, newly found that the resulting superior oil-in-water emulsified skin cosmetic beams feeling, and have completed the present invention.

  The present invention is an oil-in-water oil that has a good feeling of spreading and familiarity to the skin, and is not sticky, fresh, feeling that the active ingredient penetrates the skin (penetration feeling), emollient feeling, and feeling of elasticity. It is to provide a type emulsified skin cosmetic.

That is, this invention provides the oil-in-water type emulsified skin cosmetic characterized by containing the following component (A)-(D).
(A) Glyceryl tricaprylate (B) Polyethylene glycol monostearate (100 mol polyoxyethylene adduct), polyethylene glycol monostearate (120 mol polyoxyethylene adduct), polyethylene glycol monostearate (150 mol polyoxyethylene) 1 or 2 or more types selected from the group consisting of adducts) (C) In a composition using an organic solvent or oil as a dispersion medium and water as a dispersed phase, the water-soluble ethylenically unsaturated monomer is dissolved in the dispersed phase. A microgel obtained by radical polymerization in a dispersed phase, wherein the microgel forms a one-phase microemulsion or a fine W / O emulsion with a surfactant under the condition that dimethylacrylamide and 2-acrylamide- 2-methylpropanesulfo Thickener consisting of a microgel obtained by the acid radical polymerization (D) water

  In addition, the present invention provides that the content of the component (A) glyceryl tricaprylate is 1.0 to 15.0% by mass with respect to the total amount of the oil-in-water emulsified skin cosmetic, and the component (B) monostearic acid One selected from the group consisting of polyethylene glycol (100 mol polyoxyethylene adduct), polyethylene glycol monostearate (120 mol polyoxyethylene adduct), polyethylene glycol monostearate (150 mol polyoxyethylene adduct) Or in a composition having a content of two or more of 0.5 to 3.0% by mass, the component (C) organic solvent or oil as a dispersion medium, and water as a dispersed phase. A microgel obtained by dissolving a monomer in a dispersed phase and radical polymerization in the dispersed phase, wherein the microgel is used as a surfactant. Thus, the content of the thickener consisting of a microgel obtained by radical polymerization of dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid is 0 under the conditions for forming a one-phase microemulsion or a fine W / O emulsion. The oil-in-water emulsified skin cosmetic is characterized by being from 1 to 2.0% by mass.

  The oil-in-water emulsified skin cosmetic of the present invention has good spread and familiarity to the skin, and is non-sticky, fresh, feeling that the active ingredient penetrates into the skin (penetration feeling), emollient feeling and elasticity. It is an oil-in-water emulsified skin cosmetic with an extremely excellent feeling of use.

  The present invention is described in detail below.

“(A) Glyceryl tricaprylate”
The component (A) glyceryl tricaprylate used in the present invention functions as an oil component in the present invention, and constitutes the oil phase of the oil-in-water emulsified skin cosmetic of the present invention.
In the present invention, in addition to glyceryl tricaprylate, other oil components such as hydrocarbon oil, silicone oil, waxes, fatty acid esters, higher alcohols, and other oil components are blended to form an oil-in-water type. It is possible to produce emulsified skin cosmetics. Specific oils that can be blended will be described later.

  A commercial item can be used for the glyceryl tricaprylate used for this invention. Examples of commercially available products include “MYRITOL888” (manufactured by BASF), “Coconard RK” (manufactured by Kao Corporation), “Panasate 800” (manufactured by NOF Corporation), and “Captex 8000” (manufactured by Abitec Corporation). ), “Dub TG8” (Stearinerie Dubois Fils), “Hest TC” (Global Seven Inc.), “Trivent OC-G” (Alzo International), and the like.

  As for the compounding quantity of glyceryl tricaprylate, 1.0-15.0 mass% is preferable with respect to oil-in-water type emulsified skin cosmetics whole quantity. If it is less than 1.0 mass%, the emollient feeling that is the effect of the present invention cannot be sufficiently obtained. Moreover, even if it mix | blends exceeding 15.0 mass%, it is because the emollient feeling which is an effect of this invention is not reinforced, and stickiness will be produced on the contrary.

“(B) One or more of polyethylene glycol monostearate (POE100), polyethylene glycol monostearate (POE120), polyethylene glycol monostearate (POE150)”
The component (B) “polyethylene glycol monostearate (POE100)”, “polyethylene glycol monostearate (POE120)” and “polyethylene glycol monostearate (POE150)” used in the present invention are ethylene oxide to stearic acid. Is subjected to addition polymerization to obtain a polyethylene glycol ester having a polyethylene glycol unit of 100, 120 or 150.
In the present invention, as the component (B), one or more of the three types of polyethylene glycol monostearate are used and function as a surfactant.
In the present invention, other surfactants can be blended, and for example, self-emulsifying glyceryl monostearate can be preferably used. The surfactant which can be blended will be described later.

A commercial item can be used for the polyethylene glycol monostearate used for this invention.
Commercial products of polyethylene glycol monostearate (POE100) include “AEC PEG-100 Stearate” (A & E Connock (Perfumery & Cosmetics) Ltd.) and “Botanimulse 100-S” (Botanigenics, Inc.) `` Eumulgin SA 100 '' (manufactured by Cognis Corporation, Care Chemicals), `` Hetoxamate SA-100 '' (manufactured by Global Seven Inc.), `` Jeemate 4400-DPS '' (manufactured by Jeen International Corporation), `` Lanoxide-59 '' (Lanaetex Products, Inc.), `` Lipopeg-100-S '' (Lipo Chemicals, Inc.), `` Myrj S100 '' (Croda, Inc.), `` Protamate 4400 DPS '' (Protameen Chemicals, Inc.) ), `` Ritox 59 '' (manufactured by Rita Corporation), `` ROL 59 '' (manufactured by Fabriquimica SRL), `` Sabowax SE 100 '' (manufactured by Sabo spa), `` Simulsol M 59 '' (manufactured by Seppic), “Sympatens-BS / 1000” (manufactured by Kolb Distribution Ltd.), “Tego Acid S 100 P” (manufactured by Evonik Goldschmidt GmbH), “EMALEX8100” (manufactured by Nippon Emulsion) and the like.
Examples of commercially available polyethylene glycol monostearate (POE120) include AEC PEG-120 Stearate (manufactured by A & E Connock (Perfumery & Cosmetics) Ltd.).
Commercial products of polyethylene glycol monostearate (POE150) include AEC PEG-150 Stearate (A & E Connock (Perfumery & Cosmetics) Ltd.), HallStar PEG 6000 MS (The Hallstar Company), Jeemate 6000 DPS (Jeen International Corporation), Prodhybase 6000 (Laboratoires Prod'Hyg), Unipeg-6000 MS (Universal Preserv-A-Chem, Inc.), "EMALEX6300-ST" (Nihon Emulsion) Can be mentioned.

  One or more blending amounts selected from the group consisting of polyethylene glycol monostearate (POE100), polyethylene glycol monostearate (POE120), and polyethylene glycol monostearate (POE150) are oil-in-water emulsified skin. 0.5-3.0 mass% is preferable with respect to cosmetics whole quantity. If the amount is less than 0.5% by mass, the effects of the present invention, that is, good spread on the skin and good fit on the skin cannot be exhibited. On the other hand, adding over 3.0% by mass does not enhance the effect of the present invention, but causes stickiness.

“(C) A microgel obtained by dissolving a water-soluble ethylenically unsaturated monomer in a dispersed phase in a composition having an organic solvent or oil as a dispersion medium and water as a dispersed phase and radical polymerization in the dispersed phase. From the microgel obtained by radical polymerization of dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid under the conditions that the surfactant forms a one-phase microemulsion or a fine W / O emulsion with a surfactant. Thickener "
The thickener composed of the microgel of the component (C) used in the present invention is a polymer microgel produced by a polymerization method generally referred to as a reverse-phase emulsion polymerization method for use as a thickener. A thickener made of a synthetic polymer obtained by a homogeneous polymerization system as disclosed in JP-A-2001-114641 is a thickener having a different polymerization method and mechanical properties. In order to blend a thickener composed of a synthetic polymer obtained by a homogeneous polymerization system disclosed in JP-A-2001-114641 into a cosmetic, it must be pulverized into a powder state, Molecular gels may stand out and cause problems in appearance. The details of the thickener comprising (C) the microgel used in the present invention are described in detail in JP-A No. 2004-43785, but the microgel is a fine particle of a synthetic polymer electrolyte produced by a reverse phase microemulsion polymerization method. Since the thickener consisting of can provide a high-viscosity solution that is visually uniform in appearance, there is no problem in appearance even when blended into cosmetics.

（Ｒ₁はＨまたはメチル基、Ｒ₂及びＲ₃はそれぞれ独立にメチル基、エチル基、プロピル基、イソプロピル基を表わす。）

また、イオン性モノマーは、一般式（２）に示すアニオン性アクリルアミド誘導体、又は、一般式（３）に示すカチオン性アクリルアミド誘導体が好ましい。
一般式（２）

（Ｒ₄及びＲ₅はそれぞれ独立にＨ又はメチル基、Ｒ₆は炭素原子数１〜６の直鎖若しくは分岐のアルキル基、Ｘは金属イオン、ＮＨ3、アミン化合物を表す。例えば、金属イオンはLi、Na、Kのアルカリ金属イオン、アミン化合物はトリエタノールアミン、トリイソプロパノールアミン等である。）

一般式（３）

（Ｒ₇はＨ又はメチル基、Ｒ₈はＨまたは炭素原子数１〜６の直鎖若しくは分岐のアルキル基、Ｒ₉は炭素原子数１〜６の直鎖若しくは分岐のアルキル基、Ｒ₁₀、Ｒ₁₁、Ｒ₁₂はメチル基またはエチル基、Ｙは陰性カウンターイオンを表わし、例えば、Ｃｌ、Ｂｒ等のマイナスカウンターイオンである。）
特に好ましいジアルキルアクリルアミドは、ジメチルアクリルアミド、ジエチルアクリルアミドである。
特に好ましいイオン性アクリルアミド誘導体は、２−アクリルアミド２−メチルプロパンスルホン酸およびその塩である。
特に好ましいカチオン性アクリルアミド誘導体はＮ，Ｎ，−ジメチルアミノプロピルアクリルアミドメチルクロライドである。
非イオン性モノマーとイオン性モノマーの重合系におけるモノマー組成比（重合系の仕込み比）は、目的とするミクロゲルのモノマー構成比に応じて適宜任意に決定される。ミクロゲルのモノマー構成比と重合系への仕込み比はほぼ同一となる。非イオン性モノマーとイオン性モノマーの重合系の仕込み比（モル比）は、通常、非イオン性モノマー：イオン性モノマー＝０．５：９．５〜９．５：０．５、好ましくは１：９〜９：１、さらに好ましくは７：３〜９：１の範囲で共重合に供される。最適比率は、非イオン性モノマー：イオン性モノマー＝８：２である。
上記の水溶性エチレン性不飽和モノマーを任意に選択して本発明に用いるミクロゲルからなる増粘剤が重合される。特に好ましい増粘剤は、水溶性エチレン性不飽和モノマーにジメチルアクリルアミドと２−アクリルアミド−２−メチルプロパンスルホン酸を用い、これらのモノマーから共重合される２元共重合体のミクロゲルである。この場合に、架橋モノマーは必要がなく、自己架橋により優れた増粘効果と使用感が発揮される増粘剤が得られる。
なお、架橋モノマーを用いることも好ましく、本発明には架橋型Ｎ，Ｎ−ジメチルアクリルアミド−２−アクリルアミド−２−メチルプロパンスルホン酸ナトリウム共重合体を用いることも好ましい。その場合には一般式（４）で示される架橋モノマーが好ましく、特にメチレンビスアクリルアミドが好ましい。
一般式（４）

架橋性モノマーの使用量は、２−アクリルアミド−２−メチルプロパンスルホン酸またはその塩とジアルキルアクリルアミドの全モル数に対し0.0001〜2.0モル％の範囲で添加されることが好ましい。0.0001モル％未満で調製された増粘剤は架橋の効果が見られない場合がある。また、2モル％を超えて調製された場合、架橋密度が高すぎてミクロゲルが充分に膨潤出来ないために充分な増粘効果を発揮しない場合がある。
本発明に用いるミクロゲルの分子量は重量平均分子量１０万〜５００万（ＰＥＧ換算：ＧＰＣによる測定）程度であり、増粘剤として求められる粘度により調節される。
本発明を構成するミクロゲルは、下記（１）〜（３）のすべてのレオロジー的性質を有する。このミクロゲルからなる増粘剤は上記の重合法による製造方法により得られ、増粘剤として好ましく使用される。
（１）ミクロゲルの０.５％（質量百分率）の水分散液の見かけ粘度が、ずり速度１．０s-1において１００００mPa・s以上である。
（２）ミクロゲルの０.５％（質量百分率）のエタノール分散液の見かけ粘度が、ずり速度１．０ s-1において５０００mPa・s以上である。
（３）ミクロゲルの０.５％（質量百分率）の水分散液若しくはエタノール分散液における動的弾性率が、歪み1%以下、周波数0.01〜10Hzの範囲でG'＞G"である。
なお、ミクロゲルの水若しくはエタノール分散液の見かけ粘度とは、コーンプレート型レオメータ（Paar Rhysica製 MCR-300）を用い、測定温度25℃、ずり速度1s-1における粘度である。
また、動的弾性率は、同上の測定装置を用いて測定温度25℃、歪み1%以下で周波数範囲0.1〜10Hzで測定した貯蔵弾性率（G'）および損失弾性率（G"）の値を意味する。
なお、ミクロゲルは重合後簡単な沈殿精製工程を経て粉末状態で分離することが可能である。粉末状に分離されたミクロゲルは、水あるいはエタノールまたは水／エタノールの混合溶剤に容易に分散して速やかに膨潤し増粘剤として機能する。
また、ミクロゲルに共重合されるイオン性モノマーを、強酸性のモノマー（例えばスルホン酸残基を含むモノマー）を選択することで、従来のカルボキシビニルポリマーでは増粘が不可能であった酸性製剤の増粘も可能である。 The water-soluble ethylenically unsaturated monomer constituting the thickener composed of microgel is preferably a combination of a nonionic monomer and an ionic monomer (anionic monomer or cationic monomer).
The nonionic monomer is preferably a dialkylacrylamide represented by the following general formula (1).
General formula (1)

(R ₁ represents H or a methyl group, and R ₂ and R ₃ each independently represents a methyl group, an ethyl group, a propyl group, or an isopropyl group.)

The ionic monomer is preferably an anionic acrylamide derivative represented by the general formula (2) or a cationic acrylamide derivative represented by the general formula (3).
General formula (2)

(R ₄ and R ₅ are each independently H or a methyl group, R ₆ is a linear or branched alkyl group having 1 to 6 carbon atoms, X is a metal ion, NH 3, or an amine compound. Li, Na, K alkali metal ions, amine compounds are triethanolamine, triisopropanolamine, etc.)

General formula (3)

(R ₇ is H or a methyl group, R ₈ is H or a linear or branched alkyl group having 1 to 6 carbon atoms, R ₉ is a linear or branched alkyl group having 1 to 6 carbon atoms, R ₁₀ , R ₁₁ and R ₁₂ are a methyl group or an ethyl group, and Y represents a negative counter ion, for example, a negative counter ion such as Cl or Br.)
Particularly preferred dialkylacrylamides are dimethylacrylamide and diethylacrylamide.
Particularly preferred ionic acrylamide derivatives are 2-acrylamido 2-methylpropane sulfonic acid and its salts.
A particularly preferred cationic acrylamide derivative is N, N, -dimethylaminopropylacrylamide methyl chloride.
The monomer composition ratio in the polymerization system of the nonionic monomer and the ionic monomer (the charge ratio of the polymerization system) is arbitrarily determined arbitrarily according to the monomer composition ratio of the target microgel. The monomer composition ratio of the microgel and the charging ratio to the polymerization system are almost the same. The charging ratio (molar ratio) of the polymerization system of the nonionic monomer and the ionic monomer is usually nonionic monomer: ionic monomer = 0.5: 9.5 to 9.5: 0.5, preferably 1. : 9 to 9: 1, more preferably 7: 3 to 9: 1. The optimum ratio is nonionic monomer: ionic monomer = 8: 2.
The above-mentioned water-soluble ethylenically unsaturated monomer is arbitrarily selected, and a thickener comprising a microgel used in the present invention is polymerized. A particularly preferred thickener is a binary copolymer microgel copolymerized from dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid as water-soluble ethylenically unsaturated monomers. In this case, there is no need for a crosslinking monomer, and a thickener that exhibits an excellent thickening effect and a feeling of use due to self-crosslinking can be obtained.
In addition, it is also preferable to use a crosslinking monomer, and it is also preferable to use a crosslinked N, N-dimethylacrylamide-2-acrylamido-2-methylpropanesulfonic acid sodium copolymer in the present invention. In that case, the crosslinking monomer represented by the general formula (4) is preferable, and methylenebisacrylamide is particularly preferable.
General formula (4)

The use amount of the crosslinkable monomer is preferably in the range of 0.0001 to 2.0 mol% with respect to the total number of moles of 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof and dialkylacrylamide. Thickeners prepared at less than 0.0001 mol% may not have a crosslinking effect. Moreover, when it exceeds 2 mol%, since a crosslinking density is too high and a microgel cannot fully swell, it may not exhibit sufficient thickening effect.
The molecular weight of the microgel used in the present invention is about 100,000 to 5,000,000 (average in terms of PEG: measured by GPC), and is adjusted by the viscosity required as a thickener.
The microgel constituting the present invention has all the following rheological properties (1) to (3). The thickener composed of the microgel is obtained by the production method by the polymerization method described above, and is preferably used as a thickener.
(1) The apparent viscosity of a 0.5% (percentage by mass) aqueous dispersion of the microgel is 10000 mPa · s or more at a shear rate of 1.0 s-1.
(2) The apparent viscosity of an ethanol dispersion of 0.5% (percentage by mass) of the microgel is 5000 mPa · s or more at a shear rate of 1.0 s-1.
(3) The dynamic elastic modulus of the microgel in a 0.5% (mass percentage) aqueous dispersion or ethanol dispersion is G ′> G ″ within a strain of 1% or less and a frequency of 0.01 to 10 Hz.
The apparent viscosity of water or ethanol dispersion of microgel is the viscosity at a measurement temperature of 25 ° C. and a shear rate of 1 s-1 using a cone plate rheometer (MCR-300 manufactured by Paar Rhysica).
The dynamic elastic modulus is the value of the storage elastic modulus (G ') and loss elastic modulus (G ") measured at a measurement temperature of 25 ° C and a strain of 1% or less in the frequency range of 0.1 to 10 Hz using the same measuring device. Means.
The microgel can be separated in a powder state after polymerization through a simple precipitation purification process. The microgel separated into a powder form easily disperses in water or ethanol or a mixed solvent of water / ethanol, swells quickly, and functions as a thickener.
In addition, by selecting a strongly acidic monomer (for example, a monomer containing a sulfonic acid residue) as an ionic monomer to be copolymerized with the microgel, an acidic preparation that cannot be thickened with a conventional carboxyvinyl polymer can be obtained. Thickening is also possible.

  The blending amount of the thickener composed of the microgel used in the present invention is 0.1 to 2.0% by mass, preferably 0.2 to 1.5% by mass with respect to the total amount of the oil-in-water emulsified skin cosmetic. is there. When it exceeds 2.0 mass%, a problem may arise in terms of stickiness or freshness. On the other hand, when the amount is less than 0.1% by mass, the feeling of use is inferior to the feeling of stickiness, which may cause a problem in stability over time.

“(D) Water”
Water, which is an essential component of the present invention, constitutes an aqueous phase of an oil-in-water emulsified skin cosmetic together with other aqueous components described later. The blending amount of water is appropriately determined according to the product.

  In the oil-in-water emulsified skin cosmetic of the present invention, in addition to the above essential components, components that can be usually blended in an emulsified cosmetic can be blended as appropriate within a range that does not impair the effects of the present invention.

For example, hydrocarbon oils, silicone oils, waxes, fatty acid esters, higher alcohols, ultraviolet absorbers and the like are used as oil components constituting the oil phase.
Specifically, examples of the hydrocarbon oil include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, polyethylene wax, and Fischer Tropus wax.
Examples of the silicone oil include linear polysiloxanes (for example, dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.); cyclic polysiloxanes (for example, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), 3 Silicone resin forming a three-dimensional network structure, silicone rubber having an average molecular weight of 200,000 or more, various modified polysiloxanes (amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.) It is done.
Examples of waxes include beeswax, candelilla wax, carnauba wax, lanolin, liquid lanolin, jojoballow and the like.
Examples of fatty acid esters include myristyl myristate, cetyl palmitate, cholesteryl stearate, beeswax fatty acid 2-octyldodecyl, and the like.
Examples of the higher alcohol include hexyl alcohol, octyl alcohol, cetyl alcohol, stearyl alcohol, ceryl alcohol, behenyl alcohol, triacontyl alcohol, seraalkyl alcohol, and batyl alcohol.

Examples of the ultraviolet absorber include the following compounds.
(1) Benzoic acid-based ultraviolet absorbers For example, paraaminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N, N-dipropoxy PABA ethyl ester, N, N-diethoxy PABA ethyl ester, N, N-dimethyl PABA ethyl ester, N, N-dimethyl PABA butyl ester, N, N-dimethyl PABA ethyl ester and the like.
(2) Anthranilic acid ultraviolet absorbers such as homomenthyl-N-acetylanthranilate.
(3) Salicylic acid ultraviolet absorbers such as amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, and the like.
(4) Cinnamic acid UV absorbers For example, octyl cinnamate, ethyl-4-isopropyl cinnamate, methyl-2,5-diisopropyl cinnamate, ethyl-2,4-diisopropyl cinnamate, methyl-2,4- Diisopropyl cinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, octyl-p-methoxycinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxy Ethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl -Diparamethoxy Such as Nameto.
(5) Triazine-based ultraviolet absorber, for example, bisresorcinyl triazine. More specifically, bis {[4- (2-ethylhexyloxy) -2-hydroxy] phenyl} -6- (4-methoxyphenyl) 1,3,5-triazine, 2,4,6-tris { 4- (2-ethylhexyloxycarbonyl) anilino} 1,3,5-triazine and the like.
(6) Other ultraviolet absorbers For example, 3- (4′-methylbenzylidene) -d, l-camphor, 3-benzylidene-d, l-camphor, 2-phenyl-5-methylbenzoxazole, 2,2 '-Hydroxy-5-methylphenylbenzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, 2- (2'-hydroxy-5'-methylphenylbenzotriazole), dianisoylmethane, 4-methoxy-4′-t-butyldibenzoylmethane, 5- (3,3-dimethyl-2-norbornylidene) -3-pentan-2-one, pyridazine derivatives such as dimorpholinopyridazinone.

  On the other hand, polyhydric alcohols, water-soluble polymers, lower alcohols, antioxidants, preservatives, organic or inorganic salts and salts thereof, various water-soluble drugs, plant extracts, pigments, etc. Is mentioned.

Specifically, examples of the polyhydric alcohol include polyethylene glycol, glycerin, diglycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, 1,2-pentanediol, hexylene glycol and the like. It is done.
Examples of the water-soluble polymer include carrageenan, pectin, mannan, curdlan, chondroitin sulfate, starch, glycogen, gum arabic, sodium hyaluronate, tragacanth gum, xanthan gum, mucoitin sulfate, hydroxyethyl guar gum, carboxymethyl guar gum, guar gum, dextran. , Keratosulfuric acid, locust bean gum, succinoglucan, chitin, chitosan, carboxymethylchitin, agar and the like.
Examples of the lower alcohol include ethanol.
Examples of the antioxidant include butylhydroxytoluene, σ-tocopherol, phytin and the like.
Examples of the preservative include benzoic acid, salicylic acid, sorbic acid, paraoxybenzoic acid alkyl ester, phenoxyethanol, hexachlorophene, and ε-polylysine.
Examples of organic or inorganic acids and salts thereof include citric acid, lactic acid, hexametaphosphoric acid and the like.
Examples of the various water-soluble drugs include salts of L-ascorbic acid and its derivatives, salts of tranexamic acid and its derivatives, salts of alkoxysalicylic acid and its derivatives, salts of glutathione and its derivatives, and the like.
L-ascorbic acid is generally referred to as vitamin C, and has a cell respiration effect, an enzyme activation effect, a collagen formation action by a strong reduction action, and a melanin reduction action. L-ascorbic acid derivatives include L-ascorbic acid monostearate, L-ascorbic acid monopalmitate, L-ascorbic acid monoalkyl esters such as L-ascorbic acid monooleate; L-ascorbic acid monophosphate, L- L-ascorbic acid monoesters such as ascorbic acid-2-sulfate; L-ascorbic acid dialkyl esters such as L-ascorbic acid distearate, L-ascorbic acid dipalmitate, L-ascorbic acid dioleate; L-ascorbic acid tristearate L-ascorbic acid trialkyl esters such as Late, L-ascorbic acid tripalmitate, L-ascorbic acid trioleate; L-ascorbic acid triesters such as L-ascorbic acid triphosphate; - such as L- ascorbic acid glucosides such as ascorbic acid 2-glucoside and the like. In this invention, it uses suitably in the form of each salt of L-ascorbic acid, L-ascorbic acid phosphate ester, L-ascorbic acid-2-sulfate ester, and L-ascorbic acid 2-glucoside.
Examples of the tranexamic acid derivatives include dimers of tranexamic acid (for example, trans-4- (trans-aminomethylcyclohexanecarbonyl) aminomethylcyclohexanecarboxylic acid, etc.), and esters of tranexamic acid and hydroquinone (for example, 4- (Trans-aminomethylcyclohexanecarboxylic acid 4′-hydroxyphenyl ester, etc.), ester form of tranexamic acid and gentisic acid (for example, 2- (trans-4-aminomethylcyclohexylcarbonyloxy) -5-hydroxybenzoic acid, etc. ), Amides of tranexamic acid (for example, trans-4-aminomethylcyclohexanecarboxylic acid methylamide, trans-4- (p-methoxybenzoyl) aminomethylcyclohexanecarboxylic acid, trans-4-guanidinome) In the present invention, it is preferably used in the form of a salt of tranexamic acid or a salt of tranexamic acid derivative.
Alkoxysalicylic acid is one in which the hydrogen atom at the 3-position, 4-position or 5-position of salicylic acid is substituted with an alkoxy group, and the alkoxy group as the substituent is preferably a methoxy group, an ethoxy group or a propoxy group. , An isopropoxy group, a butoxy group or an isobutoxy group, more preferably a methoxy group or an ethoxy group. Specific examples of compound names include 3-methoxysalicylic acid, 3-ethoxysalicylic acid, 4-methoxysalicylic acid, 4-ethoxysalicylic acid, 4-propoxysalicylic acid, 4-isopropoxysalicylic acid, 4-butoxysalicylic acid, 5-methoxysalicylic acid. , 5-ethoxysalicylic acid, 5-propoxysalicylic acid and the like. In this invention, it uses suitably in the form of each salt of alkoxy salicylic acid and its derivatives (ester etc.).
Although it does not specifically limit as a salt of the said chemical | medical agent, For example, salts, such as ammonium salt and an amino acid salt other than alkali metal salt or alkaline-earth metal salt like sodium salt, potassium salt, calcium salt, are mentioned.

In addition, the following components may be mentioned as optional components that can be blended in the present invention as an oil phase component or an aqueous phase component.
Examples of vitamin A derivatives include vitamin A, vitamin A palmitate, vitamin A acetate and the like.
Examples of vitamin B derivatives include vitamin B ₆ hydrochloride, vitamin B ₆ tripalmitate, vitamin B ₆ dioctanoate, vitamin B ₂ and derivatives thereof, vitamin B ₁₂ , vitamin B ₁₅ and derivatives thereof, and the like.
Examples of vitamin E derivatives include α-tocopherol, β-tocopherol, vitamin E acetate and the like.
Other vitamins such as vitamin D, vitamin H, pantothenic acid, panthetin; γ-oryzanol, allantoin, glycyrrhizic acid (salt), glycyrrhetinic acid, stearyl glycyrrhetinate, hinokitiol, bisabolol, eucalptone, thymol, inositol, psycho Saponins such as saponin, carrot saponin, loofah saponin, muclodisaponin, various drugs such as pantothenyl ethyl ether, arbutin, cephalanthin, borage, clara, kohone, orange, sage, yarrow, mallow, thyme, spruce, spruce, Extracts of plants such as birch, horsetail, loofah, maroonier, cypress, argon, arnica, lily, mugwort, peony, aloe, gardenia, cherry leaf, pigments such as β-carotene, etc. Can be blended.

In addition, in the present invention, one or two of polyethylene glycol monostearate (POE100), polyethylene glycol monostearate (POE120), and polyethylene glycol monostearate (POE150), which is an essential emulsifier, are used. Along with the seeds or more, an emulsifier that is usually blended in cosmetics can be used as long as the effect of the present invention is not impaired.
Specifically, hexaglyceryl monolaurate (HLB value 14.5), hexaglyceryl monomyristate (HLB value 11), hexaglyceryl monostearate (HLB value 9.0), hexaglyceryl monooleate (HLB value 9) 0.0), decaglyceryl monolaurate (HLB value 15.5), decaglyceryl monomyristate (HLB value 14.0), decaglyceryl monostearate (HLB value 12.0), decaglyceryl monoisostearate (HLB value) 12.0), polyglycerin fatty acid esters such as decaglyceryl monooleate (HLB value 12.0), decaglyceryl distearate (HLB value 9.5), decaglyceryl diisostearate (HLB value 10.0), and the like.
5 mole addition of polyoxyethylene monostearate (referred to as “POE (5)”, hereinafter the same) glyceryl (HLB value 9.5), POE (15) glyceryl monostearate (HLB value 13.5), monooleic acid Polyoxyethylene glycerin fatty acid esters such as POE (5) glyceryl (HLB value 9.5) and monooleic acid POE (15) glyceryl (HLB value 14.5).
Mono palm oil fatty acid POE (20) sorbitan (HLB value 16.9), monopalmitic acid POE (20) sorbitan (HLB value 15.6), monostearic acid POE (20) sorbitan (HLB value 14.9), monostearin Acid POE (6) sorbitan (HLB value 9.5), tristearic acid POE (20) sorbitan (HLB value 10.5), monoisostearic acid POE (20) sorbitan (HLB value 15.0), monooleic acid POE (20) Polyoxyethylene sorbitan fatty acids such as sorbitan (HLB value 15.0), monooleic acid POE (6) sorbitan (HLB value 10.0), trioleic acid POE (20) sorbitan (HLB value 11.0) Esters.
Monolauric acid POE (6) sorbite (HLB value 15.5), tetrastearic acid POE (60) sorbite (HLB value 13.0), tetraoleic acid POE (30) sorbite (HLB value 11.5), tetraoleic acid Polyoxyethylene sorbite fatty acid esters such as POE (40) sorbit (HLB value 12.5) and tetraoleic acid POE (60) sorbite (HLB value 14.0).
POE (10) lanolin (HLB value 12.0), POE (20) lanolin (HLB value 13.0), POE (30) lanolin (HLB value 15.0), POE (5) lanolin alcohol (HLB value 12. 5), POE (10) lanolin alcohol (HLB value 15.5), POE (20) lanolin alcohol (HLB value 16.0), POE (40) lanolin alcohol (HLB value 17.0), POE (20) sorbit Polyoxyethylene lanolin, lanolin alcohol, beeswax derivatives such as beeswax (HLB value 9.5).
POE (20) castor oil (HLB value 10.5), POE (40) castor oil (HLB value 12.5), POE (50) castor oil (HLB value 14.0), POE (60) castor oil (HLB) Value 14.0), POE (20) hydrogenated castor oil (HLB value 10.5), POE (30) hydrogenated castor oil (HLB value 11.0), POE (40) hydrogenated castor oil (HLB value 13.5) POE (60) hydrogenated castor oil (HLB value 14.0), POE (80) hydrogenated castor oil (HLB value 16.5), POE (40) hydrogenated castor oil (100) hydrogenated castor oil (HLB value 16.5) ) And other polyoxyethylene castor oils and hardened castor oils.
POE (5) phytosterol (HLB value 9.5), POE (10) phytosterol (HLB value 12.5), POE (20) phytosterol (HLB value 15.5), POE (30) phytosterol (HLB value 18.0) ), POE (25) phytostanol (HLB value 14.5), POE (30) cholestanol (HLB value 17.0), and other polyoxyethylene sterols and hydrogenated sterols.
POE (2) lauryl ether (HLB value 9.5), POE (4.2) lauryl ether (HLB value 11.5), POE (9) lauryl ether (HLB value 14.5), POE (5.5) Cetyl ether (HLB value 10.5), POE (7) cetyl ether (HLB value 11.5), POE (10) cetyl ether (HLB value 13.5), POE (15) cetyl ether (HLB value 15.5) ), POE (20) cetyl ether (HLB value 17.0), POE (23) cetyl ether (HLB value 18.0), POE (4) stearyl ether (HLB value 9.0), POE (20) stearyl ether (HLB value 18.0), POE (21) stearyl ether (HLB value 18.0), POE (7) oleyl ether (HLB value 10.5), POE 10) oleyl ether (HLB value 14.5), POE (15) oleyl ether (HLB value 16.0), POE (20) oleyl ether (HLB value 17.0), POE (50) oleyl ether (HLB value 18) 0.0), POE (10) behenyl ether (HLB value 10.0), POE (20) behenyl ether (HLB value 16.5), POE (30) behenyl ether (HLB value 18.0), POE (2) (C _12-15 ) alkyl ether (HLB value 9.0), POE (4) (C _12-15 ) alkyl ether (HLB value 10.5), POE (10) (C _12-15 ) alkyl ether (HLB 15.5), POE (5) secondary alkyl ether (HLB value 10.5), POE (7) secondary alkyl ether (HLB value 12.0), POE (9) alkyl Ether (HLB value 13.5), POE (12) polyoxyethylene alkyl ethers such as alkyl ether (HLB value 14.5).
1 mol addition of polyoxypropylene (hereinafter referred to as “POP (1)”, hereinafter the same) POP (4) cetyl ether (HLB value 9.5), POE (10) POP (4) cetyl ether (HLB value 10.5) , POE (20) POP (8) cetyl ether (HLB value 12.5), POE (20) POP (6) decyl tetradecyl ether (HLB value 11.0), POE (30) POP (6) decyl tetradecyl Polyoxyethylene polyoxypropylene alkyl ethers such as ether (HLB value 12.0).
Polyethylene glycol monolaurate 10 mol addition (hereinafter referred to as “PEG (10)”, hereinafter the same) (HLB value 12.5), PEG monostearate (10) (HLB value 11.0), PEG monostearate (25) (HLB value 15.0), PEG monostearate (40) (HLB value 17.5), PEG monostearate (45) (HLB value 18.0), PEG monostearate (55) (HLB value 18. 0), PEG 100 monostearate (HLB value 18.8), PEG monostearate 150 (HLB value 19), PEG monooleate (10) (HLB value 11.0), PEGyl distearate (HLB value 16.5) Polyethylene glycol fatty acid esters such as PEG diisostearate (HLB value 9.5).
PEG (8) glyceryl isostearate (HLB value 10.0), PEG (10) glyceryl isostearate (HLB value 10.0), PEG (15) glyceryl isostearate (HLB value 12.0), PEG isostearate (20 ) Glyceryl (HLB value 13.0), PEG isostearate (25) Glyceryl (HLB value 14.0), PEG glyceryl isostearate (30) (HLB value 15.0), PEG isyl stearate (40) glyceryl (HLB value) 15.0), polyoxyethylene glyceryl isostearates such as PEG (50) glyceryl isostearate (HLB value 16.0) and PEG (60) glyceryl isostearate (HLB value 16.0).
Polyoxyethylene cetyl ethers such as POE (2) cetyl ether (HLB value 5), POE (3) cetyl ether (HLB value 6), POE (5) cetyl ether (HLB value 8), and the like.
Polyoxyethylene oleyl ethers such as POE (3) oleyl ether (HLB value 6), POE (5) oleyl ether (HLB value 8), POE (6) oleyl ether (HLB value 8), and the like.
Polyoxyethylene isocetyl ethers such as POE (5) isocetyl ether (HLB value 8).
Polyoxyethylene isostearyl ethers such as POE (5) isostearyl ether (HLB value 8).
Polyoxyethylene octyldodecyl ethers such as POE (5) octyldodecyl ether (HLB value 7).
Polyoxyethylene behenyl ethers such as POE (5) behenyl ether (HLB value 7).
Polyoxyethylene decyl tetradecyl ethers such as POE (5) decyl tetradecyl ether (HLB value 6).
Polyoxyethylene cholesteryl ethers such as POE (5) cholesteryl ether (HLB value 7).
Polyoxyethylene / polyoxypropylene decyl ethers such as POP (2) POE (3) decyl ether (HLB value 7).
Sorbitan fatty acid esters such as sorbitan sesquioleate (HLB value 7) and sorbitan sesquiisostearate (HLB value 7).
Glyceryl stearate (HLB value 5), self-emulsifying glyceryl stearate (HLB value 5), self-emulsifying glyceryl stearate (HLB value 6), self-emulsifying glyceryl stearate (HLB value 7), glyceryl isostearate (HLB) Mono-fatty acid glyceryls such as value 6) and glyceryl diisostearate (HLB value 3).
Propylene glycol stearate (HLB value 4), propylene glycol laurate (HLB value 5), propylene glycol distearate (HLB value 2), propylene glycol dioleate (HLB value 2), propylene glycol dilaurate (HLB value 2), Propylene glycol fatty acid esters such as propylene glycol diisostearate (HLB value 2).
Such as glycol stearate (HLB value 4), glycol dilaurate (HLB value 2), glycol dioleate (HLB value 2), glycol distearate (HLB value 2), fatty acid (C14-18) glycol (HLB value 2), etc. Ethylene glycol fatty acid esters.
Monostearate polyethylene glycols such as stearic acid PEG (2) (HLB value 5), stearic acid PEG (3) (HLB value 7), stearic acid PEG (5) (HLB value 8);
Monooleic acid polyethylene glycols such as oleic acid PEG (3) (HLB value 7).
Polyoxyethylene hydrogenated castor oils such as PEG (5) hydrogenated castor oil (HLB value 5), PEG (7) hydrogenated castor oil (HLB value 6), PEG (10) hydrogenated castor oil (HLB value 7), etc. .
Polyethylene glycol isostearates such as PEG (3) isostearate (HLB value 7).
Stearic acid POE (3) cetyl ether (HLB value 3), stearic acid POE (4) cetyl ether (HLB value 4), stearic acid POE (6) cetyl ether (HLB value 6), stearic acid POE (7) cetyl ether Stearic acid polyoxyethylene cetyl ethers such as (HLB value 7);
Stearic acid POE (4) stearyl ether (HLB value 4), stearic acid POE (6) stearyl ether (HLB value 5), stearic acid POE (9) stearyl ether (HLB value 6), stearic acid POE (7) stearyl ether Stearic acid polyoxyethylene stearyl ethers such as (HLB value 7), stearic acid POE (10) stearyl ether (HLB value 7), stearic acid POE (12) stearyl ether (HLB value 8);
Stearic acid POE (3) lauryl ether (HLB value 3), stearic acid POE (5) lauryl ether (HLB value 5), stearic acid POE (8) lauryl ether (HLB value 7), stearic acid POE (10) lauryl ether Stearic acid polyoxyethylene lauryl ethers such as (HLB value 8);
Isostearic acid POE (2) lauryl ether (HLB value 2), isostearic acid POE (5) lauryl ether (HLB value 5), isostearic acid POE (8) lauryl ether (HLB value 7), isostearic acid POE (8) lauryl ether Isostearic acid polyoxyethylene lauryl ethers such as (HLB value 7) and isostearic acid POE (10) lauryl ether (HLB value 8).
Dilauric acid PEG (2) (HLB value 4), dilauric acid PEG (3) (HLB value 5), dilauric acid PEG (4) (HLB value 5), dilauric acid PEG (6) (HLB value 5), dilauric acid Polyethylene glycol dilaurates such as PEG (8) (HLB value 8).
Distearic acid PEG (2) (HLB value 2), distearic acid PEG (3) (HLB value 3), distearic acid PEG (3) (HLB value 3), distearic acid PEG (3) (HLB value 3), distearic acid PEG (4) (HLB value 4), distearic acid PEG (6) (HLB value 5), distearic acid PEG (8) (HLB value 6), distearic acid PEG (12) (HLB value 8), distearic acid PEG ( Polyethylene glycol distearate such as HLB value 8).
Diisostearic acid PEG (2) (HLB value 3), diisostearic acid PEG (3) (HLB value 3), diisostearic acid PEG (4) (HLB value 4), diisostearic acid PEG (6) (HLB value 5), diisostearic acid Diisostearic polyethylene glycols such as PEG (8) (HLB value 6) and diisostearic acid PEG (12) (HLB value 8).
Dioleic acid PEG (2) (HLB value 3), Dioleic acid PEG (3) (HLB value 3), Dioleic acid PEG (4) (HLB value 4), Dioleic acid PEG (6) (HLB value 5), Dioleic acid Dioleic acid polyethylene glycols such as PEG (8) (HLB value 6) and dioleic acid PEG (12) (HLB value 8).
Polyoxyethylene sorbit sorbitan fatty acid such as PEG (4) sorbit tetraoleate (HLB value 3), PEG (3) sorbite tristearate (HLB value 3), PEG (4) sorbitan triisostearate (HLB value 3) Esters.
PEG (3) glyceryl triisostearate (HLB value 2), PEG (5) glyceryl triisostearate (HLB value 3), PEG (10) glyceryl triisostearate (HLB value 3), glyceryl triisostearate (20) Polyoxyethylene glyceryl triisostearate such as (HLB value 8).
Polyisoethylene glyceryl diisostearate such as PEG (10) glyceryl diisostearate (HLB value 7).
Polyoxyethylene glyceryl isostearates such as PEG (3) glyceryl isostearate (HLB value 6), PEG (5) glyceryl isostearate (HLB value 8), and PEG (6) glyceryl isostearate (HLB value 8).
PEG tristearate (3) glyceryl (HLB value 2), PEG tristearate (4) glyceryl (HLB value 2), PEG tristearate (5) glyceryl (HLB value 3), glyceryl tristearate (6) Polyoxyethylene glyceryl tristearates such as (HLB value 3), PEG (10) glyceryl tristearate (HLB value 5), PEG (20) tristearate (HLB value 8) and the like.
Polyoxyethylene glyceryl distearates such as PEG (4) glyceryl distearate (HLB value 4).
PEG trioleate (3) glyceryl (HLB value 2), PEG trioleate (5) glyceryl (HLB value 3), PEG trioleate (10) glyceryl (HLB value 5), glyceryl trioleate (20) Polyoxyethylene glyceryl trioleates such as (HLB value 8).
PEG (5) hydrogenated castor oil (HLB value 4), isostearic acid PEG (10) hydrogenated castor oil (HLB value 5), isostearic acid PEG (15) hydrogenated castor oil (HLB value 7), isostearic acid Polyoxyethylene hydrogenated castor oil isostearate such as PEG (20) hydrogenated castor oil (HLB value 8).
PEG (5) hydrogenated castor oil (HLB value 2), triisostearic acid PEG (10) hydrogenated castor oil (HLB value 4), triisostearic acid PEG (15) hydrogenated castor oil (HLB value 5) PEG (20) hydrogenated castor oil (HLB value 6), triisostearic acid PEG (30) hydrogenated castor oil (HLB value 7), triisostearic acid PEG (40) hydrogenated castor oil (HLB value 8) ) And the like, polyisoethylene stearic acid polyoxyethylene hydrogenated castor oil.
Lauric acid polyoxyethylene hydrogenated castor oil such as lauric acid PEG (20) hydrogenated castor oil (HLB value 8).
Polystearic acid PEG (3) trimethylolpropane (HLB value 2), tristearic acid PEG (5) trimethylolpropane (HLB value 3), tristearic acid PEG (10) trimethylolpropane (HLB value 5), etc. Oxyethylene tristearate trimethylolpropane.
Polyoxyethylene trimyristate trimethylolpropanes such as trimyristate PEG (3) trimethylolpropane (HLB value 2) and trimyristate PEG (5) trimethylolpropane (HLB value 3).
Polyoxyethylene distearate such as PEG (3) distearate (3) trimethylolpropane (HLB value 3), PEG (4) distearate (4) trimethylolpropane (HLB value 4), PEG (3) distearate (3) trimethylolpropane (HLB value 4) Acid trimethylolpropane.
Polyoxyethylene triisostearate trimethylolpropanes such as PEG (3) triisostearate (3) trimethylolpropane (HLB value 2) and PEG (20) triisostearate (HLB value 8).
Lauroylglutamate dihexyldecyl (HLB value 3), lauroylglutamate dioctyldodecyl (HLB value 3), stearoylglutamate dioctyldodecyl (HLB value 3), lauroylglutamate dioctyldodecyl (HLB value 3), lauroylglutamate dioctyldecyl ether ether POD HLB value 4), dioctyl lauroyl glutamate POE (5) dodecyl ether (HLB value 6), lauroyl glutamic acid POE (2) distearyl ether (HLB value 4), lauroyl glutamic acid POE (5) distearyl ether (HLB value 7), etc. N-acyl glutamates.
N-acyl neutral amino acid esters such as hexyldecyl myristoylmethylaminopropionate (HLB value 4).
Polyglyceryl stearate (2) (HLB value 6), polyglyceryl stearate (2) (HLB value 8), polyglyceryl distearate (2) (HLB value 4), polyglyceryl distearate (3) (HLB value 5), distearic acid Polyglyceryl (6) (HLB value 8), polyglyceryl tristearate (10) (HLB value 8), polyglyceryl diisostearate (2) (HLB value 4), polyglyceryl triisostearate (2) (HLB value 3), diisostearic acid Polyglyceryl (3) (HLB value 5), polyglyceryl diisostearate (6) (HLB value 8) polyglyceryl triisostearate (10) (HLB value 8), polyglyceryl oleate (2) (HLB value 8), polyglyceryl diisostearate ( 2) (HLB 4), polyglycerol fatty acid esters such as polyglyceryl diisostearate (3) (HLB value 5).
Silicone surfactants such as PEG (7) dimethicone (HLB value 5) and PEG (10) dimethicone (HLB value 6).

  The oil-in-water emulsified skin cosmetic of the present invention can preferably produce, for example, milk products such as emulsifying foundations and sunscreen emulsions, and cream products such as skin care creams, whitening creams and anti-aging creams. These products can be produced by a conventional method by mixing the essential ingredients of the present invention and optional ingredients that are usually blended into cosmetics.

  The present invention will be described in further detail with reference to the following examples. The present invention is not limited thereby. Unless otherwise specified, the amount is shown in mass%.

  First, the synthesis example of the microgel which comprises the thickener used for this invention is demonstrated. The microgel obtained in the synthesis example is a thickener composed of the microgel of component (C) used in the present invention.

Synthesis example 1
40 g of dimethylacrylamide (manufactured by Kojin) and 9 g of 2-acrylamide-2-methylpropanesulfonic acid (manufactured by Sigma) are dissolved in 250 g of ion-exchanged water and adjusted to pH = 7.0 with sodium hydroxide. To a 1000 ml three-necked flask equipped with a reflux apparatus, 250 g of n-hexane, 8.2 g of polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) and polyoxyethylene (6) oleyl ether (Emalex 506, 16.4g (made in Japan Emulsion) is mixed and dissolved to replace N2. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N 2 atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system and polymerization is started. A microgel is formed by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 2
35 g of dimethylacrylamide (manufactured by Kojin) and 17.5 g of 2-acrylamido-2-methylpropanesulfonic acid (manufactured by Sigma) are dissolved in 260 g of ion-exchanged water and adjusted to pH = 7.0 with sodium hydroxide. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Add 17.6g (made in Japan Emulsion), mix and dissolve to replace N2. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N 2 atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system and polymerization is started. A microgel is formed by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 3
30 g of dimethylacrylamide (manufactured by Kojin) and 26.7 g of 2-acrylamide-2-methylpropanesulfonic acid (manufactured by Sigma) are dissolved in 280 g of ion-exchanged water, and the pH is adjusted to 7.0 with sodium hydroxide. To a 1000 ml three-necked flask equipped with a reflux apparatus, 280 g of n-hexane, 9.4 g of polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) and polyoxyethylene (6) oleyl ether (Emalex 506, Add 19g (made in Japan Emulsion), mix and dissolve to replace N2. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N 2 atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system and polymerization is started. A microgel is formed by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 4
35 g of dimethylacrylamide (manufactured by Kojin), 17.5 g of 2-acrylamide-2-methylpropanesulfonic acid (manufactured by Sigma) and 7 mg of methylenebisacrylamide are dissolved in 260 g of ion-exchanged water and adjusted to pH = 7.0 with sodium hydroxide. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and epolyoxyethylene (6) oleyl ether (Emalex 506) (Made by Nippon Emulsion) Add 17.6g, dissolve and mix with N2. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N 2 atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system and polymerization is started. A microgel is formed by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 5
35 g of dimethylacrylamide (manufactured by Kojin), 17.5 g of 2-acrylamide-2-methylpropanesulfonic acid (manufactured by Sigma) and 70 mg of methylenebisacrylamide are dissolved in 260 g of ion-exchanged water and adjusted to pH = 7.0 with sodium hydroxide. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Add 17.6g (made in Japan Emulsion), mix and dissolve to replace N2. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N 2 atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system and polymerization is started. A microgel is formed by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis Example 6
35 g of dimethylacrylamide (manufactured by Kojin) and 17.5 g of N, N-dimethylaminopropylacrylamide methyl chloride (manufactured by Kojin) are dissolved in 260 g of ion-exchanged water. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Add 17.6g (made in Japan Emulsion), mix and dissolve to replace N2. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N 2 atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system and polymerization is started. A microgel is formed by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Synthesis example 7
35 g of dimethylacrylamide (manufactured by Kojin), 17.5 g of N, N-dimethylaminopropylacrylamide methyl chloride (manufactured by Kojin) and 7 mg of methylenebisacrylamide are dissolved in 260 g of ion-exchanged water. In a 1000 ml three-necked flask equipped with a reflux apparatus, 260 g of n-hexane, polyoxyethylene (3) oleyl ether (Emalex 503, manufactured by Nippon Emulsion) 8.7 g and polyoxyethylene (6) oleyl ether (Emalex 506, Add 17.6g (made in Japan Emulsion), mix and dissolve to replace N2. An aqueous monomer solution is added to the three-necked flask and heated to 65 ° C. to 70 ° C. in an oil bath while stirring in an N 2 atmosphere. After confirming that the system is in a translucent microemulsion state when the temperature of the system reaches 65 ° C. to 70 ° C., 2 g of ammonium persulfate is added to the polymerization system and polymerization is started. A microgel is formed by maintaining the polymerization system at 65-70 ° C. with stirring for 3 hours. After the polymerization is completed, acetone is added to the microgel suspension to precipitate the microgel, followed by washing with acetone three times to remove residual monomer and surfactant. The precipitate is filtered and dried under reduced pressure to obtain a dried white powdered microgel.

Skin care creams of Examples 1 to 9 and Comparative Examples 1 to 9 having the blending compositions described in “Tables 1 and 2” were produced by a conventional method.
About the obtained skin care cream (sample), the following test methods evaluated the usability (skin spread, familiarity to the skin, freshness, penetrating feeling, stickiness, emollient feeling, stickiness) by the following methods. .

[A feeling of use (spreading to the skin)]
An actual use test was conducted by a panel dedicated to women (10 persons), and the skin extension was evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: All 10 persons judged that the spread was light and smooth.
○: 7 to 9 persons judged that the spread was light and smooth.
(Triangle | delta): Three to six persons judged that the spread was light and smooth.
X: 0 to 2 persons were judged to be light and smooth.

[Usage feeling (familiarity with skin)]
An actual use test was conducted by a panel dedicated to women (10 persons), and the familiarity with the skin was evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: All 10 people determined that they were familiar with the skin.
○: Seven to nine people determined that they were familiar with the skin.
(Triangle | delta): Three to six persons determined with having familiarity with skin.
X: 0 to 2 persons determined that they were familiar with the skin.

[Usage feeling (stickiness)]
An actual use test was conducted by a panel dedicated to women (10 persons), and the stickiness was evaluated according to the following evaluation criteria.
(Evaluation criteria)
A: All 10 people judged that there was no stickiness and was moist.
○: 7 to 9 people judged that there was no stickiness and was moist.
(Triangle | delta): It determined that 3-6 persons did not have stickiness and were moist.
X: It was determined that 0 to 2 persons were not sticky and moist.

[Usage feeling (freshness)]
An actual use test was conducted by a panel dedicated to women (10 persons), and the freshness was evaluated according to the following evaluation criteria.
(Evaluation criteria)
(Double-circle): All 10 persons judged having freshness.
○: Seven to nine people determined that there was freshness.
(Triangle | delta): Three to six persons determined that there was freshness.
X: 0-2 persons judged having freshness.

[Usage feeling (penetration: active ingredient permeates the skin)]
An actual use test was conducted by a panel dedicated to women (10 persons), and the penetrance was evaluated according to the following evaluation criteria.
(Evaluation criteria)
(Double-circle): All 10 persons determined that there was a feeling of penetration.
○: Seven to nine people determined that there was a sense of penetration.
(Triangle | delta): Three to six persons determined that there was a penetrating feeling.
X: 0 to 2 persons determined that there was a sense of penetration.

[Usage feeling (emollient feeling)]
An actual use test was conducted by a panel dedicated to women (10 persons), and the emollient feeling was evaluated according to the following evaluation criteria.
(Evaluation criteria)
(Double-circle): All 10 persons determined that there was an emollient feeling.
○: Seven to nine people determined that there was an emollient feeling.
(Triangle | delta): Three to six persons determined with emollient feeling.
X: 0-2 persons judged having emollient feeling.

[A feeling of use (feel)]
An actual use test was conducted by a panel dedicated to women (10 persons), and the skin feel was evaluated according to the following evaluation criteria.
(Evaluation criteria)
(Double-circle): All 10 persons determined that there was a feeling of skin elasticity.
○: Seven to nine people determined that there was a feeling of skin stickiness.
(Triangle | delta): Three to six persons determined that there was a feeling of skin elasticity.
X: 0 to 2 persons determined that there was a feeling of skin stickiness.

＊１ 商品名：SIMULGEL EG（SEPIC社製）
＊２ 商品名：カバーリーフ AR-80（日揮触媒化成（株）社製）

* 1 Product name: SIMULGEL EG (SEPIC)
* 2 Product name: Coverleaf AR-80 (manufactured by JGC Catalysts & Chemicals Co., Ltd.)

＊１ 商品名：SIMULGEL EG（SEPIC社製）
＊２ 商品名：カバーリーフ AR-80（日揮触媒化成（株）社製）

* 1 Product name: SIMULGEL EG (SEPIC)
* 2 Product name: Coverleaf AR-80 (manufactured by JGC Catalysts & Chemicals Co., Ltd.)

As is clear from the examples of “Table 1” and the comparative examples of “Table 2”, the skin care creams of Examples 1 to 9 containing the essential components of the present invention have excellent usability in all evaluation items. You can see that

  Other examples of the oil-in-water emulsified skin cosmetic of the present invention are shown below.

Example 10 Whitening cream (compounding ingredient)
(1) Ion exchange water Residue (2) Sodium hexametaphosphate 0.1
(3) Sodium hyaluronate 0.1
(4) Tranexamic acid 2.0
(5) Titanium oxide 0.2
(6) Dipropylene glycol 3.0
(7) 1,3-butylene glycol 2.0
(8) Glycerin 3.0
(9) (Component (C)) Microgel of Synthesis Example 2 0.9
(10) N-stearoyl-potassium aspartate 0.1
(11) Ethylparaben 0.5
(12) Rosemary extract 0.1
(13) Sage extract 0.1
(14) Glyceryl monostearate 0.5
(15) (Component (B)) Polyethylene glycol monostearate (POE120)
1.7
(16) Polyether-modified silicone 0.1
(Product name: KF-6017P, manufactured by Shin-Etsu Chemical Co., Ltd.)
(17) Behenic acid 0.4
(18) Myristic acid 0.2
(19) (Hydroxystearic acid / stearic acid / rosinic acid) 0.1
Dipentaerythrityl (trade name: Cosmall 168E, manufactured by Nisshin Oilio Co., Ltd.)
(20) α-olefin oligomer 1.0
(21) (Component (A)) Glyceryl tricaprylate 5.0
(22) Dimethylpolysiloxane 1.5cs 2.0
(23) Octocrylene 0.1
(24) Perfume appropriate amount <Production method>
(14) to (24) were uniformly mixed and dissolved at 70 ° C. (oil phase). On the other hand, (1) to (13) were uniformly mixed and dissolved at 70 ° C. (aqueous phase). The mixture was emulsified with a homomixer while gradually adding the oil phase to the aqueous phase maintained at 70 ° C. When the emulsification was completed, the product was rapidly cooled to 40 ° C. or lower to obtain a desired whitening cream having a desired viscosity of 30000 mPa · s / 30 ° C. (BH viscometer rotor No. 6, 10 rpm).
<Product properties>
About the obtained whitening cream, when the same evaluation as Examples 1-9 was performed, it was what was excellent in all the feelings of use (evaluation: (double-circle)).

Example 11 Whitening cream (compounding ingredient)
(1) Ion exchange water Residue (2) Edetate 0.1
(3) Acetylated sodium hyaluronate 0.1
(4) Potassium 4-methoxysalicylate 1.0
(5) Silicic anhydride 0.2
(6) Dipropylene glycol 2.0
(7) 1,3-butylene glycol 3.0
(8) Glycerin 9.0
(9) (Component (C)) Microgel of Synthesis Example 3 2.0
(10) Methylparaben 0.1
(11) Ethylparaben 0.5
(12) Atlantic hawthorn extract 0.1
(13) Lumpuyan extract 0.1
(14) Self-emulsifying glyceryl monostearate 2.4
(15) (Component (B)) Polyethylene glycol monostearate (POE100)
1.6
(16) Sorbitan tristearate 0.1
(17) Behenyl alcohol 0.4
(18) Stearyl alcohol 0.2
(19) Isodecyl pivalate 2.0
(20) Isohexadecane 1.0
(21) (Component (A)) Glyceryl tricaprylate 5.0
(22) Dimethylpolysiloxane 1.5cs 2.0
(23) Octocrylene 0.1
(24) Perfume appropriate amount <Production method>
(14) to (24) were uniformly mixed and dissolved at 70 ° C. (oil phase). On the other hand, (1) to (13) were uniformly mixed and dissolved at 70 ° C. (aqueous phase). The mixture was emulsified with a homomixer while gradually adding the oil phase to the aqueous phase maintained at 70 ° C. When the emulsification was completed, the mixture was rapidly cooled to 40 ° C. or lower to obtain a desired whitening cream having a desired viscosity of 40,000 mPa · s / 30 ° C. (BH viscometer rotor No. 6, 10 rpm).
<Product properties>
About the obtained whitening cream, when the same evaluation as Examples 1-9 was performed, it was what was excellent in all the feelings of use (evaluation: (double-circle)).

Example 12 Anti-aging cream (compounding ingredients)
(1) Ion exchange water Residue (2) Edetate 0.1
(3) Acetylated sodium hyaluronate 0.1
(4) Carnosine 3.0
(5) Citric acid 0.1
(6) Dipropylene glycol 2.0
(7) 1,3-butylene glycol 3.0
(8) Glycerin 9.0
(9) (Component (C)) Microgel of Synthesis Example 4 1.3
(10) Methylparaben 0.1
(11) Phenoxyethanol 0.3
(12) Hydrolyzed yeast extract 0.1
(13) Green tea extract 0.1
(14) Self-emulsifying glyceryl monostearate 2.4
(15) (Component (B)) Polyethylene glycol monostearate (POE150)
1.8
(16) Sorbitan tristearate 0.1
(17) Behenyl alcohol 0.5
(18) Stearyl alcohol 0.4
(19) Cetyl ethylhexanoate 2.0
(20) Isododecane 1.0
(21) (Component (A)) Glyceryl tricaprylate 9.0
(22) Dimethylpolysiloxane 2cs 2.0
(23) Vitamin E acetate 0.1
(24) Perfume appropriate amount <Production method>
(14) to (24) were uniformly mixed and dissolved at 70 ° C. (oil phase). On the other hand, (1) to (13) were uniformly mixed and dissolved at 70 ° C. (aqueous phase). The mixture was emulsified with a homomixer while gradually adding the oil phase to the aqueous phase maintained at 70 ° C. When the emulsification was completed, the mixture was rapidly cooled to 40 ° C. or lower to obtain a target anti-aging cream having a target viscosity of 35,000 mPa · s / 30 ° C. (BH viscometer rotor No. 6, 10 rpm).
<Product properties>
About the obtained anti-aging cream, when evaluation similar to Examples 1-9 was performed, it was the thing (evaluation: (double-circle)) excellent in all the usability | use_conditions.

  The oil-in-water emulsified skin cosmetic of the present invention is a skin cosmetic that has good spread and familiarity to the skin, is not sticky, and is extremely excellent in use feeling such as freshness, penetrating feeling, emollient feeling, stickiness, etc. It can be preferably used for creamy products such as skin care creams, whitening creams and anti-aging creams, and milky products such as emulsifying foundations and sunscreen emulsions.

Claims (2)

An oil-in-water emulsified skin cosmetic comprising the following components (A) to (D):
(A) Glyceryl tricaprylate (B) Polyethylene glycol monostearate (100 mol polyoxyethylene adduct), polyethylene glycol monostearate (120 mol polyoxyethylene adduct), polyethylene glycol monostearate (150 mol polyoxyethylene) 1 or 2 or more types selected from the group consisting of adducts) (C) In a composition using an organic solvent or oil as a dispersion medium and water as a dispersed phase, the water-soluble ethylenically unsaturated monomer is dissolved in the dispersed phase. A microgel obtained by radical polymerization in a dispersed phase, wherein the microgel forms a one-phase microemulsion or a fine W / O emulsion with a surfactant under the condition that dimethylacrylamide and 2-acrylamide- 2-methylpropanesulfo Thickener consisting of a microgel obtained by the acid radical polymerization (D) water   Content of the said component (A) glyceryl tricaprylate is 1.0-15.0 mass% with respect to the total amount of oil-in-water type emulsified skin cosmetics, and said component (B) polyethylene glycol monostearate (100 mol poly) Oxyethylene adduct), polyethylene glycol monostearate (120 mol polyoxyethylene adduct), or one or more types selected from the group consisting of polyethylene glycol monostearate (150 mol polyoxyethylene adduct) In a composition having an amount of 0.5 to 3.0% by mass, the component (C) organic solvent or oil as a dispersion medium, and water as a dispersion phase, a water-soluble ethylenically unsaturated monomer is dissolved in the dispersion phase. A microgel obtained by radical polymerization in a dispersed phase, wherein the microgel is a one-phase microphone by a surfactant. The content of the thickener comprising a microgel obtained by radical polymerization of dimethylacrylamide and 2-acrylamido-2-methylpropanesulfonic acid under conditions for forming an emulsion or a fine W / O emulsion is 0.1-2. The oil-in-water emulsified skin cosmetic according to claim 1, wherein the content is 0% by mass.