Oil-in-water emulsion cosmetic

Abstract

To provide an oil-in-water emulsified cosmetic simultaneously improved in many properties in use.SOLUTION: Provided is an oil-in-water emulsified cosmetic comprising: (A) a hydrophilic spherical silica powder; (B) an alkyl-modified carboxyvinyl polymer; and (C) an oily component. The content of the (A) hydrophilic spherical silica powder is 5 mass% or more relative to the total amount of the oil-in-water emulsified cosmetic. The content of the (C) oily component is 0.1 to 2.5 mass% relative to the total amount of the oil-in-water emulsified cosmetic.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an oil-in-water type emulsified cosmetic.

Background Art

[0002] Conventionally, various oil-in-water type emulsified cosmetics for applying to the skin to enhance the texture of the skin have been studied. Such oil-in-water type emulsified cosmetics are required to have various characteristics during use.

[0003] For example, in Patent Document 1, in order to obtain a smooth and transparent skin feel after use, with a lasting effective feeling of exfoliating keratin by powder, appropriate viscosity, elongation, and slipperiness, and good usability on the skin, a cosmetic containing specific amounts of specific silica powder, specific fibrous powder, and thickening agent has been proposed. Further, in Patent Document 2, an oil-in-water type external preparation for skin containing specific amounts of polyacrylic acid or its metal salt, alkyl-modified carboxyvinyl polymer, and specific polyethylene glycol has been proposed in order to satisfy spinnability and usability such as freshness and non-stickiness. So far, in order to satisfy various characteristics, various components have been studied for blending, but further improvement of characteristics is required.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Generally, with oil-in-water emulsion cosmetics, improving specific properties according to the intended purpose often makes it difficult to balance other properties, making it challenging to satisfy all properties simultaneously. Therefore, there has always been a demand for oil-in-water emulsion cosmetics that can simultaneously improve many properties while maintaining such a balance.

[0006] The inventors investigated improving the refreshing feel during use and the smooth feeling after use by incorporating a large amount (e.g., 5% by mass or more) of silica powder into an oil-in-water emulsion cosmetic. However, they discovered a new problem: the powder that fell onto the fingerprints of the fingers that applied the product after use appeared as white residue.

[0007] The inventors of the present invention conducted diligent studies to solve the above problems and, as a result, found that the above problems could be solved by incorporating an alkyl-modified carboxyvinyl polymer and an oily component into an oil-in-water emulsion cosmetic composition containing a large amount of silica powder, and further adjusting the content of the oily component, thereby completing the present invention. [Means for solving the problem]

[0008] The present invention provides the following: [1] (A) Hydrophilic spherical silica powder, (B) Alkyl-modified carboxyvinyl polymer, and (C) Oily component An oil-in-water emulsion cosmetic containing, The content of the hydrophilic spherical silica powder (A) is 5% by mass or more relative to the total amount of the oil-in-water emulsion cosmetic, The content of the oily component (C) is 0.1% by mass or more and 2.5% by mass or less, relative to the total amount of the oil-in-water emulsion cosmetic. Oil-in-water emulsion cosmetic. [2] The oil-in-water emulsion cosmetic according to [1], wherein the (B) alkyl-modified carboxyvinyl polymer is an (acrylates / alkyl(C10-30) acrylate) crosspolymer. [3] The oil-in-water emulsion cosmetic according to [1] or [2], wherein the content of (B) alkyl-modified carboxyvinyl polymer is 0.01% by mass or more and 0.5% by mass or less with respect to the total amount of the oil-in-water emulsion cosmetic. [4] (D) an oil-in-water emulsion cosmetic according to any one of [1] to [3], further comprising a water-soluble polymer. [5] The oil-in-water emulsion cosmetic according to [4], wherein the (D) water-soluble polymer is at least one selected from the group consisting of polyethylene glycol with a molecular weight of 4000 or more and polyvinyl alcohol with a molecular weight of 4000 or more. [6] The oil-in-water emulsion cosmetic according to [4] or [5], wherein the content of the water-soluble polymer (D) is 0.1% by mass or more with respect to the total amount of the oil-in-water emulsion cosmetic. [7] (E) an oil-in-water emulsion cosmetic according to any of [1] to [6], further comprising a humectant. [Effects of the Invention]

[0009] The present invention provides an oil-in-water emulsion cosmetic that simultaneously improves many properties during use, specifically, its freshness during use, its non-stickiness after use, its smooth feel, and the absence of white cast caused by powder. [Modes for carrying out the invention]

[0010] [Oil-in-water emulsion cosmetic] The oil-in-water emulsion cosmetic according to the present invention contains (A) hydrophilic spherical silica powder, (B) alkyl-modified carboxyvinyl polymer, and (C) an oily component as essential components. Furthermore, the oil-in-water emulsion cosmetic according to the present invention may also contain (D) a water-soluble polymer, (E) a humectant, an aqueous solvent, and other components, depending on the purpose. The oil-in-water emulsion cosmetic according to the present invention can simultaneously improve freshness during use, non-stickiness after use, a smooth feeling, and the absence of white cast due to powder. The components contained in the oil-in-water emulsion cosmetic according to the present invention will be described in detail below.

[0011] ((A) Hydrophilic spherical silica powder) As the hydrophilic spherical silica powder, any conventionally known silica powder can be used as long as it is hydrophilic and substantially spherical, preferably perfectly spherical. From the viewpoint of compatibility with other components, the silica powder is preferably porous.

[0012] The volume-average particle size of the hydrophilic spherical silica powder is not particularly limited, but is preferably 1 μm to 30 μm, more preferably 2 μm to 15 μm, and even more preferably 3 μm to 10 μm. The volume-average particle size of the hydrophilic spherical silica powder can be measured according to the laser diffraction method.

[0013] The oil absorption capacity of the hydrophilic spherical silica powder is not particularly limited, but is preferably 10 ml / 100g or more and 500 ml / 100g or less, more preferably 30 ml / 100g or more and 300 ml / 100g or less, and even more preferably 50 ml / 100g or more and 200 ml / 100g or less. The oil absorption capacity of the hydrophilic spherical silica powder can be measured in accordance with JIS Z 8830.

[0014] The BET specific surface area of ​​the hydrophilic spherical silica powder is not particularly limited, but is preferably 10 m². 2 / g or more 700m 2 / g or less, more preferably 50m 2 / g or more 500m 2 It is less than or equal to / g, and more preferably 100m 2 / g or more 400m 2 It is less than / g. The BET specific surface area of ​​hydrophilic spherical silica powder can be measured in accordance with JIS K 5101-13-2.

[0015] Commercially available hydrophilic spherical silica powder can be used. Preferably, hydrophilic spherical silica powders include Sunsphere H-52, L-51S, H-121 (all from AGC SI-TEC Inc.), Godball E-6C (Suzuki Oil & Fat Industry Co., Ltd.), Satinia M5, Spherical Silica P-1500 (all from JGC Catalysts & Chemicals Inc.), TMS-10 (Teika Co., Ltd.), etc.

[0016] The content of the hydrophilic spherical silica powder is 5% by mass or more, more preferably 7% by mass or more and 15% by mass or less, and still more preferably 8% by mass or more and 12% by mass or less, based on the total amount of the oil-in-water type emulsified cosmetic. If the content of the hydrophilic spherical silica powder is within the above numerical range, the oil-in-water type emulsified cosmetic will be excellent in freshness during use and smoothness after use.

[0017] ((B) Alkyl-modified carboxyvinyl polymer) Examples of the alkyl-modified carboxyvinyl polymer include, for example, (acrylates / alkyl acrylate (C10-C30)) cross-polymer. A commercially available product may be used for the (acrylates / alkyl acrylate (C10-C30)) cross-polymer, and Pemulen TR-2 Polymeric Emulsifier (manufactured by Lubrizol Advanced Materials, Inc.) can be mentioned.

[0018] The content of the alkyl-modified carboxyvinyl polymer is preferably 0.01% by mass or more and 0.5% by mass or less, more preferably 0.02% by mass or more and 0.2% by mass or less, and still more preferably 0.05% by mass or more and 0.15% by mass or less, based on the total amount of the oil-in-water type emulsified cosmetic. If the content of the alkyl-modified carboxyvinyl polymer is within the above numerical range, the oil-in-water type emulsified cosmetic will be excellent in freshness during use.

[0019] ((C) Oil component) Examples of the oil component include, for example, synthetic ester oil, liquid oil and fat, solid oil and fat, wax, hydrocarbon, higher fatty acid, etc. These oil components may be used alone or in combination of two or more.

[0020] Synthetic ester oils include isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexanoate, and triisostearate. Methylolpropane, pentaerythritol tetra-2-ethylhexanoate, glycerin tri-2-ethylhexanoate, glycerin trioctanoate, glycerin triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimiristicate, glyceride tri-2-heptylundecanoate, methyl castor oil fatty acid ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, 2-octyldodecyl N-lauroyl-L-glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyl palmitate Examples include xyldecyl, 2-hexyldecyl adipic acid, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0021] Examples of liquid oils include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, peach kernel oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, elm oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnamon oil, Japanese tuni oil, jojoba oil, wheat germ oil, and triglycerin.

[0022] Examples of solid fats and oils include cocoa butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, sheep fat, hydrogenated beef tallow, palm kernel oil, lard, beef bone fat, Japanese wax kernel oil, hydrogenated oil, beef tallow, Japanese wax, and hydrogenated castor oil.

[0023] Examples of waxes include beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, privet wax, whale wax, montan wax, rice bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, isopropyl lanolin fatty acid, hexyl laurate, reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

[0024] Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0025] Examples of high-grade fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tallic acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA).

[0026] The oily component content is 0.1% by mass or more and 2.5% by mass or less, more preferably 0.3% by mass or more and 2% by mass or less, and even more preferably 0.5% by mass or more and 1% by mass or less, based on the total amount of the oil-in-water emulsion cosmetic. If the oily component content is within the above numerical range, the oil-in-water emulsion cosmetic will have excellent freshness during use, no stickiness after use, and no white cast caused by powder.

[0027] ((D) Water-soluble polymer) As the water-soluble polymer, for example, at least one selected from the group consisting of polyethylene glycol with a molecular weight of 4000 or more and polyvinyl alcohol with a molecular weight of 4000 or more can be used. The molecular weight of polyethylene glycol and polyvinyl alcohol is preferably 4000 to 50000, and more preferably 10000 to 30000. By using polyethylene glycol and polyvinyl alcohol having molecular weights within the above numerical range, the oil-in-water emulsion cosmetic will have excellent freshness during use, no stickiness after use, and no white cast due to powder.

[0028] As the water-soluble polymer, commercially available products can be used. As the polyethylene glycol, for example, PEG-75 (molecular weight 4000), PEG-150 (molecular weight 6000), and PEG-400 (molecular weight 20000) are preferred.

[0029] The water-soluble polymer content is 0.1% by mass or more and 2.5% by mass or less, more preferably 0.2% by mass or more and 1.5% by mass or less, and even more preferably 0.3% by mass or more and 1% by mass or less, based on the total amount of the oil-in-water emulsion cosmetic. When the water-soluble polymer content is within the above numerical range, the oil-in-water emulsion cosmetic exhibits excellent freshness during use, non-stickiness after use, and no white cast due to powder.

[0030] ((E) Moisturizer) The humectant is not particularly limited, and conventionally known humectants for cosmetic use can be used. Examples of such humectants include polyhydric alcohols and glycol ethers, and more specifically, glycerin, propanediol, ethylene glycol, diethylene glycol, dipropylene glycol, 1,3-butylene glycol, hexamethylene glycol, isoprene glycol, polyethylene glycol, hyaluronic acid, xylitol, sorbitol, maltitol, diglycerin (EO)PO adducts, etc.

[0031] The amount of humectant is preferably 1% to 20% by mass, more preferably 3% to 15% by mass, and even more preferably 5% to 10% by mass, based on the total amount of the oil-in-water emulsion cosmetic.

[0032] (Aqueous solvent) The aqueous solvent is not particularly limited, and conventionally known aqueous solvents can be used. Examples of aqueous solvents include water, alcohol, or mixtures thereof.

[0033] For the water used, you can use water that is used in cosmetics, such as purified water, deionized water, or tap water.

[0034] Examples of alcohols that can be used include lower alcohols such as ethanol, 1-propanol, 2-propanol, isobutyl alcohol, and t-butyl alcohol.

[0035] The content of the aqueous solvent is not particularly limited and can be adjusted as appropriate depending on the content of other components.

[0036] (Other ingredients) The oil-in-water emulsion cosmetic composition according to the present invention may contain other components that can be incorporated into the oil-in-water emulsion cosmetic composition, as long as they do not impair the effects of the present invention. Examples of such other components include thickeners, dispersants, neutralizing agents, chelating agents, preservatives, antioxidants, stabilizers, surfactants, colorants, fragrances, and the like. These components can be appropriately incorporated depending on the dosage form of the oil-in-water emulsion cosmetic composition.

[0037] The oil-in-water emulsion cosmetic according to the present invention can be manufactured by conventional methods. For example, at least a portion of the oily component is added to the aqueous component and emulsified using a homomixer or the like. Subsequently, the remaining oily component and silica powder are added and stirred to prepare the product.

[0038] The viscosity of the oil-in-water emulsion cosmetic composition according to the present invention at 30°C is not particularly limited, but is preferably 500 to 10000 mPa·s, more preferably 1000 to 5000 mPa·s, and even more preferably 1500 to 3000 mPa·s. The viscosity at 30°C was measured using a commercially available BH-type viscometer with rotor No. 3 and a rotation speed of 12 rpm.

[0039] The pH of the oil-in-water emulsion cosmetic composition according to the present invention at room temperature is not particularly limited, but is preferably 5 to 8, more preferably 5.5 to 7.5, and even more preferably 6 to 7. The pH at 30°C was measured using a commercially available pH meter.

[0040] (Application) The oil-in-water emulsion cosmetic composition according to the present invention can be suitably used as a cosmetic product, for example, a lotion, serum, emulsion, or cream. [Examples]

[0041] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the amounts are expressed in mass percent.

[0042] [Examples 1-7, Comparative Examples 1-6] <Preparation of oil-in-water emulsion cosmetic> Oil-in-water emulsion cosmetics for each example and comparative example were prepared using the formulations shown in Tables 1 and 3. Note that the proportions of each component in Tables 1 and 3 are expressed in mass percent.

[0043] <Performance evaluation of oil-in-water emulsion cosmetics> [viscosity] The viscosity (mPa·s) of the oil-in-water emulsion cosmetic prepared as described above was measured one hour after preparation using a BH-type viscometer, model number ViscoQC 100-L, manufactured by Anton Paar, with rotor No. 3 and a rotation speed of 12 rpm at 30°C. The measurement results are shown in Tables 2 and 4.

[0044] [pH] The pH of the oil-in-water emulsion cosmetic prepared above was measured using a pH meter at room temperature. The measurement results are shown in Tables 2 and 4.

[0045] <Evaluation of the usability of oil-in-water emulsion cosmetics> The usability of the oil-in-water emulsion cosmetic prepared above was evaluated based on the following criteria for freshness, non-stickiness, smoothness, and white cast caused by powder.

[0046] [Sticky] (Evaluation method) Ten professional panel members, all women in their 30s and 40s who had received training in sensory evaluation and were capable of evaluating according to a set standard, were selected. These panel members applied each oil-in-water emulsion cosmetic to their hands and evaluated the lack of stickiness after application. Each oil-in-water emulsion cosmetic was evaluated on a 5-point scale using the absolute evaluation method described below, and a score was assigned. The average score was calculated from the total scores of all panel members for each oil-in-water emulsion cosmetic, and the final judgment was made. The evaluation results are shown in Tables 2 and 4. A score from A to D indicates a passing grade. <Rating> 5 points: Absolutely no stickiness. 4 points: Almost no stickiness. 3 points: It's not sticky at all. 2 points: It feels sticky. 1 point: It feels very sticky. <Evaluation Criteria> A: Average score of 4.5 or higher B: Average score is between 4.0 and 4.5 points. C: Average score is between 3.5 and 4.0 D: Average score is between 3.0 and 3.5 points. E: Average score is less than 3.0

[0047] [Freshness] (Evaluation method) Ten expert panel members, all women in their 30s and 40s who had received training in sensory evaluation and were capable of evaluating according to a set standard, were selected. Each panel member applied each oil-in-water emulsion cosmetic to their hand and evaluated its moisturizing properties during use. Each oil-in-water emulsion cosmetic was evaluated on a 5-point scale using the absolute evaluation method described below, and a score was assigned. The average score was calculated from the total scores of all panel members for each emulsion cosmetic, and this was used for the final determination. The evaluation results are shown in Tables 2 and 4. A score from A to D indicates a passing grade. <Rating> 5 points: I really feel the freshness. 4 points: I really feel the freshness. 3 points: It feels fresh and juicy. 2 points: It hardly feels fresh. 1 point: It doesn't feel fresh at all. <Evaluation Criteria> A: Average score of 4.5 or higher B: Average score is between 4.0 and 4.5 points. C: Average score is between 3.5 and 4.0 D: Average score is between 3.0 and 3.5 points. E: Average score is less than 3.0

[0048] [Smooth texture] (Evaluation method) Ten professional panel members, all women in their 30s and 40s who had received training in sensory evaluation and were capable of evaluating according to a set standard, were selected. These panel members applied each oil-in-water emulsion cosmetic to their hands and evaluated the resulting smooth feeling after application. Each oil-in-water emulsion cosmetic was evaluated on a 5-point scale using the absolute evaluation method described below, and a score was assigned. The average score was calculated from the total scores of all panel members for each oil-in-water emulsion cosmetic, and the final judgment was made based on this average. The evaluation results are shown in Tables 2 and 4. A score from A to D indicates a passing grade. <Rating> 5 points: I really like the smooth, silky feel. 4 points: Feels very smooth and dry. 3 points: Feels smooth and dry. 2 points: I hardly feel any smoothness. 1 point: I don't feel any smoothness at all. <Evaluation Criteria> A: Average score of 4.5 or higher B: Average score is between 4.0 and 4.5 points. C: Average score is between 3.5 and 4.0 D: Average score is between 3.0 and 3.5 points. E: Average score is less than 3.0

[0049] [White cast caused by powder] (Evaluation method) Ten expert panel members, all women in their 30s and 40s who had received training in sensory evaluation and were capable of evaluating according to a set standard, were selected. These panel members applied each oil-in-water emulsion cosmetic to their hands and evaluated whether or not there was any white residue from the powder after application. Each oil-in-water emulsion cosmetic was evaluated on a 5-point scale using the absolute evaluation method described below, and a score was assigned. The average score was calculated from the total scores of all panel members for each oil-in-water emulsion cosmetic and used for the final determination. The evaluation results are shown in Tables 2 and 4. A score from A to D indicates a passing grade. <Rating> 5 points: No white cast from the powder is visible at all. 4 points: There is almost no white cast caused by the powder. 3 points: Only slight white cast due to powder is visible. 2 points: White residue from powder is no longer visible. 1 point: A lot of white residue is visible due to the powder. <Evaluation Criteria> A: Average score of 4.5 or higher B: Average score is between 4.0 and 4.5 points. C: Average score is between 3.5 and 4.0 D: Average score is between 3.0 and 3.5 points. E: Average score is less than 3.0

[0050] [Table 1]

[0051] [Table 2]

[0052] [Table 3]

[0053] [Table 4]

[0054] From the results above, it can be seen that all of the oil-in-water emulsion cosmetics according to the present invention are excellent in terms of freshness during use, non-stickiness after use, smoothness, and absence of white cast due to powder. Furthermore, the viscosity of all of the oil-in-water emulsion cosmetics according to the present invention was within a range suitable for cosmetics one hour after manufacturing.

[0055] Furthermore, considering the results of the comparative examples together, it can be seen that the oil-in-water emulsion cosmetic composition according to the present invention achieves excellent effects by simultaneously incorporating a specific amount of hydrophilic spherical silica powder, alkyl-modified carboxyvinyl polymer, and a specific amount of oily component. Moreover, it can be seen that even when alkyl-modified carboxyvinyl polymer is added to an oil-in-water emulsion cosmetic composition containing a large amount of hydrophilic spherical silica powder, if the amount of oily component is high, the freshness during use and stickiness after use worsen.

Claims

1. (A) Hydrophilic spherical silica powder, (B) Alkyl-modified carboxyvinyl polymer, (C) Oily components, and (D) water-soluble polymer; An oil-in-water emulsion cosmetic containing, The content of (A) hydrophilic spherical silica powder is 10% by mass or more and 15% by mass or less, relative to the total amount of the oil-in-water emulsion cosmetic. The content of the oily component (C) is 0.1% by mass or more and 2.5% by mass or less, relative to the total amount of the oil-in-water emulsion cosmetic. The (D) water-soluble polymer is at least one selected from the group consisting of polyethylene glycol with a molecular weight of 4000 or more and polyvinyl alcohol with a molecular weight of 4000 or more. The content of the water-soluble polymer (D) is 0.1% by mass or more and 3.0% by mass or less, relative to the total amount of the oil-in-water emulsion cosmetic. Oil-in-water emulsion cosmetic.

2. The oil-in-water emulsion cosmetic according to claim 1, wherein the (B) alkyl-modified carboxyvinyl polymer is an (acrylates / alkyl acrylate (C10-30)) crosspolymer.

3. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the content of (B) alkyl-modified carboxyvinyl polymer is 0.01% by mass or more and 0.5% by mass or less with respect to the total amount of the oil-in-water emulsion cosmetic.

4. The oil-in-water emulsion cosmetic according to any one of claims 1 to 3, wherein the content of the water-soluble polymer (D) is 0.2% by mass or more and 3.0% by mass or less based on the total amount of the oil-in-water emulsion cosmetic.

5. (E) The oil-in-water emulsion cosmetic composition according to any one of claims 1 to 4, further comprising a humectant.

6. The oil-in-water emulsion cosmetic composition according to claim 5, wherein the (E) humectant comprises at least one selected from the group consisting of glycerin, 1,3-butylene glycol, and propanediol.

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