Oil-in-water emulsion cosmetic

Abstract

[Problem] To provide an oil-in-water type emulsion cosmetic which has a highly permeable feeling like an emulsion, has a rich feeling like a cream when applied to the skin, and imparts a moist feeling to the skin after application, said oil-in-water type emulsion cosmetic having superior characteristics unique to the present invention that have not been known in the prior art. [Solution] This oil-in-water emulsion cosmetic is characterized by containing (A) a higher fatty acid, (B) a water-soluble polysaccharide having a molecular weight of 2,500,000 or more, (C) silica, and (D) a higher alcohol, the amount of (D) higher alcohol being less than 0.95 mass% relative to the total amount of the oil-in-water emulsion cosmetic.

Description

Technical Field

[0001] The present invention relates to an oil-in-water emulsified cosmetic. More specifically, it relates to an oil-in-water emulsified cosmetic that has a high penetration feeling like an emulsion, has a thick feeling like a cream (a thick feeling or texture when applied to the skin), and gives a moist touch to the skin after application. Background Art

[0002] In skin care cosmetics, the feeling of use is an important factor. In particular, emulsions have the characteristics of being smooth and easy to spread on the skin when applied, having high penetration into the skin, and having a non-sticky and dry feeling on the skin. On the other hand, many consumers also expect a rich feeling or texture when used. In other words, it is required to realize an oil-in-water emulsified cosmetic that maintains the lightness of spreading and excellent penetration of emulsions, and has a thick feeling during application and a moist feeling after application like a cream.

[0003] Therefore, for example, it is considered that the viscosity of the emulsion can be increased by adding a certain amount of higher alcohol to improve the thick feeling and moist feeling. However, if a large amount of higher alcohol is added, it will spread more when applied to the skin, and there is a tendency to impair the penetration of the emulsion.

[0004] In addition, skin care cosmetics such as emulsions are often provided to consumers in containers such as plug bottles, dispensers, and pouches. In order to ensure the way the cosmetics come out of the container and the stability of the preparation, it is important to control the viscosity of the cosmetics to be appropriate. However, although cosmetics that have been blended with a certain amount of higher alcohols to increase viscosity have good stability at high temperatures, they sometimes lose fluidity at low temperatures, making it difficult to take out of the container and difficult to handle.

[0005] As another attempt to impart a thick feeling to oil-in-water emulsified cosmetics, a combination of two thickeners, acrylamide thickener and hydroxypropyl methylcellulose, has been proposed (Patent Document 1). However, in addition to insufficient improvement in the thick feeling, it was also confirmed that the penetration feeling was impaired.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2019-89741 Summary of the invention

[0009] Problem that the invention aims to solve

[0010] An object of the present invention is to provide an oil-in-water emulsified cosmetic having excellent properties unique to the present invention that have never been seen before, which has a high penetration feeling like an emulsion, has a thick feeling like a cream when applied to the skin, and gives a moist touch to the skin after application.

[0011] Solutions for solving problems

[0012] The present inventors have conducted intensive studies to solve the above-mentioned problems and, as a result, have found that by blending higher fatty acids, water-soluble polysaccharides of a specific molecular weight, silica, and a specified amount of higher alcohols, an oil-in-water emulsified cosmetic having the targeted penetration feeling, rich feeling, and moist feeling, and also excellent fluidity at low temperatures and stability at high temperatures can be obtained, thereby completing the present invention.

[0013] That is, the present invention provides an oil-in-water emulsified cosmetic comprising:

[0014] (A) Higher fatty acids,

[0015] (B) water-soluble polysaccharides with a molecular weight of 2.5 million or more,

[0016] (C) silica, and

[0017] (D) higher alcohols,

[0018] (D) The amount of the higher alcohol blended is less than 0.95% by mass based on the total amount of the oil-in-water emulsified cosmetic.

[0019] Effects of the Invention

[0020] The oil-in-water emulsified cosmetic of the present invention has the above-mentioned configuration, and has a high penetration feeling like an emulsion, and has a thick feeling like a cream when applied to the skin, and can give a moist touch feeling to the skin after application.

[0021] In addition, since the fluidity at low temperatures and the stability at high temperatures are excellent, there is also an effect that the stability of the preparation during storage and the ease of taking out from the container are not easily affected by the temperature. DETAILED DESCRIPTION

[0022] The oil-in-water emulsified cosmetic of the present invention is characterized by comprising (A) a higher fatty acid, (B) a water-soluble polysaccharide having a molecular weight of 2.5 million or more, (C) silica, and (D) a higher alcohol, wherein the higher alcohol (D) is contained in a specific amount. The oil-in-water emulsified cosmetic of the present invention is described in detail below.

[0023] <(A) Higher fatty acids>

[0024] (A) Higher fatty acids are higher fatty acids generally used in cosmetics and are represented by the general formula R1COOH, wherein R1 is preferably a linear or branched saturated or unsaturated hydrocarbon group having 16 to 22 carbon atoms.

[0025] Specific examples of the (A) higher fatty acid include palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, arachidonic acid, eicosapentaenoic acid, docosahexaenoic acid, behenic acid, elaidic acid, ricinoleic acid, and isostearic acid.

[0026] The amount of the higher fatty acid (A) is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and preferably 2.0% by mass or less, more preferably 1.5% by mass or less, relative to the total amount of the oil-in-water emulsified cosmetic. Therefore, examples of the amount range include 0.1 to 2.0% by mass, 0.3 to 1.5% by mass, and the like.

[0027] <(B) Water-soluble polysaccharides>

[0028] (B) Water-soluble polysaccharides are water-soluble polysaccharides having a basic skeleton of polysaccharides or derivatives thereof and having a molecular weight of 2.5 million or more. Here, the molecular weight of (B) water-soluble polysaccharides refers to a weight average molecular weight, which can be measured, for example, by GPC (gel permeation chromatography).

[0029] The molecular weight of the water-soluble polysaccharide (B) is 2.5 million or more, more preferably 5 million or more, and even more preferably 6 million or more. The upper limit of the molecular weight of the water-soluble polysaccharide (B) is not particularly limited, but is usually preferably 20 million or less, more preferably 10 million or less, and even more preferably 7.5 million or less.

[0030] (B) Water-soluble polysaccharides include, for example, hyaluronic acid or its salt, acetylated hyaluronic acid or its salt, xanthan gum, succinoglycan, gellan gum, pectin, alginate, propylene glycol alginate, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, etc. Among them, water-soluble polysaccharides derived from microorganisms such as xanthan gum, succinoglycan, and gellan gum are preferred, and in particular, any one or both of xanthan gum and succinoglycan are preferably included from the aspects of excellent salt resistance and stability when used in combination with various drugs.

[0031] Preferred commercial products of (B) water-soluble polysaccharides include, for example, Rheozan (registered trademark) (succinoglycan; molecular weight 6 million, Solvay Nikka Co., Ltd.), NOMCORT ZZ (xanthan gum; molecular weight 20 million, Nissin Oillio Group Ltd.), and the like.

[0032] The amount of the water-soluble polysaccharide (B) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and preferably 0.50% by mass or less, more preferably 0.30% by mass or less, relative to the total amount of the oil-in-water emulsified cosmetic. Therefore, examples of the amount range include 0.01 to 0.50% by mass, 0.05 to 0.30% by mass, and the like.

[0033] <(C) Silica>

[0034] (C) Silica The silica generally used in cosmetics can be used, and any of porous, non-porous, and hollow silica can be used.

[0035] The oil absorption of the silica (C) is preferably 40 ml / 100 g or more, more preferably 100 ml / 100 g or more. By adding silica having an oil absorption of 40 ml / 100 g or more, the thick feeling, penetration feeling and moist feeling can be further improved.

[0036] The "oil absorption" in this specification refers to a value measured in accordance with JIS K 5101-13:2004 (refined linseed oil method).

[0037] Specifically, it can be obtained by the following method.

[0038] First, collect 1.5 g of spherical silicic anhydride as a sample on a medicine packaging paper and transfer it to a glass measuring plate. Next, add refined linseed oil (oil specified in JIS K 5101) from a burette to the sample in the form of 4 or 5 drops at a time, and knead the whole thoroughly with a palette knife each time. Repeat this dropping and kneading. If the whole becomes a hard putty-like mass, knead it drop by drop. The moment when the last drop can be wound into a spiral shape with a palette knife is taken as the end point. Calculate the oil absorption per 100 g of sample using the following formula. Oil absorption (ml / 100g) = (A / W) × 100 (A represents the amount of refined linseed oil added (mL), and W represents the amount of sample collected (g))

[0039] Preferred commercially available products of (C) silica include, for example, SUNSPHERE L-51 (oil absorption 150 ml / 100 g, AGC Si-Tech Co., Ltd.), SUNSPHERE H-52 (oil absorption 300 ml / 100 g, AGC Si-Tech Co., Ltd.), and BA4 (oil absorption 40 mL / 100 g, JGC Catalysts & Chemicals Co., Ltd.).

[0040] The amount of silica (C) is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and preferably 3.0% by mass or less, more preferably 1.0% by mass or less, relative to the total amount of the oil-in-water emulsified cosmetic. Therefore, examples of the amount range include 0.01 to 3.0% by mass, 0.05 to 1.0% by mass, and the like.

[0041] <(D) Higher Alcohol>

[0042] (D) The higher alcohol is a higher alcohol commonly used in cosmetics, and is particularly preferably a higher alcohol having 16 to 22 carbon atoms. Preferred examples of the component (D) include cetyl alcohol, stearyl alcohol, oleyl alcohol, behenyl alcohol, etc. Among them, straight-chain unbranched cetyl alcohol, stearyl alcohol, and behenyl alcohol are particularly preferred.

[0043] The amount of the higher alcohol (D) is less than 0.95% by mass, preferably less than 0.80% by mass, and more preferably less than 0.60% by mass, relative to the total amount of the oil-in-water emulsified cosmetic. When the amount of the higher alcohol (D) is greater than 0.95% by mass, the penetration may be poor. The lower limit of the amount of the higher alcohol (D) is not particularly limited, but is generally preferably greater than 0.10% by mass, and more preferably greater than 0.20% by mass.

[0044] <(D) / (A) weight ratio>

[0045] In the oil-in-water emulsified cosmetic of the present invention, the weight ratio of the higher alcohol (D) to the higher fatty acid (A) ([(D) / (A) weight ratio]) is preferably 0.4 to 0.8, and more preferably 0.5 to 0.7. When the (D) / (A) weight ratio is within this range, a gel having a high penetrating feel and imparting sufficient viscosity and stability can be formed, which is preferred.

[0046] <Optional Ingredients>

[0047] The oil-in-water emulsified cosmetic of the present invention may further contain components other than the above-mentioned (A) to (D), such as aqueous solvents, oil components, moisturizers, drugs, surfactants, chelating agents, preservatives, antioxidants, etc., as needed, within the range not impairing the effects of the present invention.

[0048] Examples of the aqueous solvent include water (purified water, ion-exchanged water, tap water, etc.), lower alcohols, and mixtures thereof.

[0049] The oil component is not particularly limited, and various oil components widely used in cosmetics can be used. However, in the present invention, if the ratio of semi-solid and solid oil components is too much, the viscosity of the cosmetic becomes high, and there is a tendency that the penetration and low-temperature fluidity are impaired. In addition, if the ratio of liquid oil components is too much, the viscosity of the cosmetic becomes low, and there is a tendency that the thick feeling, moist feeling, and high-temperature stability become insufficient. Therefore, it is preferred that the mass ratio of semi-solid and solid oil components to liquid oil components ([semi-solid and solid oil components] / [liquid oil components]) is adjusted to preferably 0.01 to 0.40, more preferably 0.05 to 0.30, and more preferably 0.10 to 0.25.

[0050] In the present invention, when the mass ratio of the semisolid and solid oil components to the liquid oil components ([semisolid and solid oil components] / [liquid oil components]) is calculated, the (D) higher alcohol is also included in the semisolid and solid oil components.

[0051] In addition, the total amount of oil is preferably 3% by mass or more, more preferably 5% by mass or more, and preferably 25% by mass or less, more preferably 20% by mass or less, relative to the total amount of the oil-in-water emulsified cosmetic. Therefore, the range of the total amount of oil includes 3 to 25% by mass, 5 to 20% by mass, etc.

[0052] Semisolid and solid oils refer to oils that are semisolid or solid at room temperature (25°C). Examples of such oil components include solid oils and fats such as cocoa butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, hydrogenated beef tallow, palm kernel oil, lard, beef bone oil, Japanese wax kernel oil, hydrogenated oil, neatsfoot oil, sumac wax, and hydrogenated castor oil; waxes such as beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, insect wax, spermaceti wax, montan wax, rice bran wax, lanolin, kapok wax, acetylated lanolin, sugarcane wax, isopropyl lanolinate, hydrogenated lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesteryl ether, and POE hydrogenated lanolin alcohol ether; hydrocarbon waxes such as polyethylene wax, paraffin wax, ceresin, vaseline, microcrystalline wax, and lanacera; fatty acid glyceryl ethers such as monostearyl glyceryl ether (baty alcohol), and the like, and any of these can be used alone or in combination of two or more.

[0053] Liquid oils refer to oils that are liquid at room temperature (25°C). Examples of such oils include avocado oil, evening primrose oil, camellia oil, turtle oil, macadamia nut seed oil, sunflower seed oil, sweet almond oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, peach kernel oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, ginkgo oil, rice bran oil, paulownia oil, Japanese tung oil, jojoba oil, and germ oil; liquid oils such as cetyl ethylhexanoate, cetyl 2-ethylhexanoate, dimethyl octanoate hexyldecyl, laurel Ethyl myristate, isopropyl myristate, 2-hexyldecyl myristate, myristyl myristate, octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecanol palmitate, butyl stearate, isocetyl stearate, isocetyl isostearate, decyl oleate, dodecyl oleate, oleyl oleate, myristyl lactate, cetyl lactate, diisostearyl malate, 12-hydroxystearate cholesterol, methyl ricinoleate, 2-ethylhexyl succinate, diisobutyl adipate, 2-Hexyldecyl adipate, di(2-heptylundecanol) adipate, diisopropyl sebacate, di(2-ethylhexyl) sebacate, ethylene glycol di-2-ethylhexanoate, neopentyl glycol dicaprate, neopentyl glycol di(ethylhexanoate), glyceryl di-2-heptylundecanate, glyceryl tri(ethylhexanoate), glyceryl tri(2-ethylhexanoate), glyceryl trimyristate, glyceryl tripalmitate, trimethylolpropane tri(2-ethylhexanoate), trimethylolpropane triisostearate, pentaerythritol tetra(ethylhexanoate), pentaerythritol tetra(2-ethylhexanoate) Ester oils such as tri(ethylhexanoate), glyceryl tri(ethylhexanoate), and cetyl ethylhexanoate; hydrocarbon oils such as liquid paraffin, squalene, cholestane, polybutene, and hydrogenated polydecene; chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and diphenylpolysiloxane, cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane, and various modified polysiloxanes such as amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, and fluorine-modified polysiloxane. Silicone oils can be used alone or in combination of two or more.

[0054] Examples of the moisturizer include polyoxyalkylene-polyoxyethylene copolymer dialkyl ethers, 1,3-butylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, hexylene glycol, glycerin, diglycerin, xylitol, maltitol, maltose, and D-mannitol.

[0055] As the drug, a wide range of drugs commonly used in cosmetics can be added, which have whitening effects, rough skin improvement effects, anti-Propionibacterium acnes effects, etc. Among them, it is preferred to add (E) a water-soluble component having at least one carboxyl group or a salt thereof.

[0056] Examples of the (E) water-soluble component include ascorbic acid, salicylic acid, tranexamic acid, kojic acid, ellagic acid, alkoxysalicylic acid, niacinamide and glycyrrhizic acid, and salts or derivatives thereof (e.g., sodium L-ascorbate, magnesium L-ascorbate, L-ascorbyl glucoside, 2-O-ethyl-L-ascorbic acid, 3-O-ethyl-L-ascorbic acid, sodium 4-methoxysalicylic acid, potassium 4-methoxysalicylic acid, dipotassium glycyrrhizinate, stearyl glycyrrhizinate, and the like).

[0057] The oil-in-water emulsified cosmetic of the present invention is thickened by the (B) water-soluble polysaccharide having high salt resistance among the water-soluble thickeners, so even if a high amount of the above-mentioned drugs is added, the usability and stability are not easily impaired. For example, the amount of the (E) water-soluble component added can be 0.01 to 5.00 mass %, further 0.05 to 3.00 mass %, further 0.4 to 1.2 mass %, etc. relative to the total amount of the oil-in-water emulsified cosmetic.

[0058] <Viscosity>

[0059] The viscosity of the oil-in-water emulsified cosmetic of the present invention measured with a B-type viscometer at 0° C. is preferably 15,000 mPa·s or less, more preferably 10,000 mPa·s or less. If the viscosity at 0° C. is 15,000 mPa·s or less, excellent fluidity can be maintained even at low temperatures.

[0060] The viscosity of the oil-in-water emulsified cosmetic of the present invention measured with a B-type viscometer at 50° C. is preferably 500 mPa·s or more, more preferably 1500 mPa·s or more. If the viscosity at 50° C. is 500 mPa·s or more, excellent stability can be maintained even at high temperatures.

[0061] <Preparation method>

[0062] The oil-in-water emulsified cosmetic of the present invention is not particularly limited and can be produced, for example, by adding an oily portion including component (A), component (D) and other oily components and component (C) to an aqueous phase including component (B) and other aqueous components and emulsifying the mixture using a conventional method.

[0063] The oil-in-water emulsified cosmetic of the present invention can be provided as a skin care cosmetic such as an emulsion, and is particularly suitable for being provided in a bottle container or a bag container.

[0064] Example

[0065] The present invention is further described in detail by way of specific examples below, but the present invention is not limited to the following examples. In addition, the blending amount in the following examples is expressed as mass % relative to the total amount of the cosmetic unless otherwise specified. Before describing each example in detail, the evaluation method used is described.

[0066] (1) Fluidity at low temperatures

[0067] The viscosity of each cosmetic (sample) stored at 0° C. was measured using a B-type viscometer (rotor No. 3). The fluidity at low temperature was evaluated based on the obtained viscosity according to the following evaluation criteria.

[0068] <Evaluation Criteria>

[0069] A: Viscosity is less than 10000 mPa·s

[0070] B: Viscosity higher than 10000 mPa·s and less than 15000 mPa·s

[0071] C: Viscosity higher than 15000mPa·s

[0072] (2) Stability at high temperatures

[0073] The viscosity of each cosmetic (sample) stored at 50° C. was measured using a B-type viscometer (rotor No. 3). Based on the obtained viscosity, the stability at high temperature was evaluated according to the following evaluation criteria.

[0074] <Evaluation Criteria>

[0075] A: Viscosity is 1500mPa·s or more

[0076] B: Viscosity is 500 mPa·s or more and less than 1500 mPa·s

[0077] C: Viscosity less than 500mPa·s

[0078] (3) Thickness

[0079] Professional judges used each cosmetic (sample) and evaluated the rich feeling during application according to the following criteria.

[0080] <Evaluation Criteria>

[0081] A: It feels very thick when applied.

[0082] B: It feels thick when applied

[0083] C: Almost no thick feeling during application

[0084] D: No thick feeling during application

[0085] (4) Penetration

[0086] Professional judges used each cosmetic (sample) and evaluated the penetration of the cosmetic into the skin during application according to the following criteria.

[0087] <Evaluation Criteria>

[0088] A: It has a very penetrating feel during application.

[0089] B: There is a sense of penetration when applied

[0090] C: Almost no penetration during application

[0091] D: No sense of penetration during application

[0092] (5) Moisture

[0093] Professional judges used each cosmetic (sample) and evaluated the moist feeling after application according to the following criteria.

[0094] <Evaluation Criteria>

[0095] A: It feels very moist during application

[0096] B: Feel moist during application

[0097] C: Not very moist during application

[0098] D: Not moist during application

[0099] [Example 1 to Example 12 and Comparative Example 1 to Comparative Example 5]

[0100] The oil-in-water emulsified cosmetics shown in the following Table 1 were prepared and evaluated with respect to the above-mentioned items (1) to (5).

[0101] [Table 1A]

[0102]

Table 1A

[0103]

[0104] [Table 1B]

[0105]

Table 1B

[0106]

[0107] As shown in Table 1, the oil-in-water emulsified cosmetics comprising (A) higher fatty acids, (B) water-soluble polysaccharides having a molecular weight of 2,500,000 or more, (C) silica and (D) higher alcohols, wherein the amount of the higher alcohol (D) blended is less than 0.95% by mass relative to the total amount of the oil-in-water emulsified cosmetics, showed sufficient results for all evaluation items (Examples 1 to 12).

[0108] On the other hand, when (A) the higher fatty acid and (D) the higher alcohol were not contained, the rich feeling, the penetration feeling, and the moist feeling were significantly deteriorated (Comparative Example 1).

[0109] In addition, when (B) the water-soluble polysaccharide with a molecular weight of 2.5 million or more was not added and instead selected from xanthan gum (molecular weight 1.2 million), carbomer and sodium acrylate / sodium acryloyldimethyl taurate copolymer were added, any evaluation item deteriorated significantly (Comparative Examples 2 and 3).

[0110] When barium sulfate was added as a powder replacing the (C) silica, sufficient richness and penetration could not be obtained (Comparative Example 4).

[0111] Furthermore, when more than 0.95 mass % of the (D) higher alcohol is added, the penetration feeling and the fluidity at low temperature are impaired (Comparative Example 5).

Claims

1. An oil-in-water emulsified cosmetic comprising: (A) Higher fatty acids, (B) water-soluble polysaccharides with a molecular weight of 2.5 million or more, (C) silica, and (D) higher alcohols, (D) The amount of the higher alcohol blended is less than 0.95% by mass based on the total amount of the oil-in-water emulsified cosmetic.

2. The oil-in-water emulsified cosmetic according to claim 1, wherein (A) The higher fatty acid is a higher fatty acid having 16 to 22 carbon atoms.

3. The oil-in-water emulsified cosmetic according to claim 1, wherein (D) The higher alcohol is a higher alcohol having 16 to 22 carbon atoms.

4. The oil-in-water emulsified cosmetic according to claim 1, wherein (B) The water-soluble polysaccharide is either or both of succinoglycan and xanthan gum.

5. The oil-in-water emulsified cosmetic according to claim 1, wherein (C) Silica has an oil absorption of 40 mL / 100 g or more. 6 . The oil-in-water emulsified cosmetic according to claim 1 , further comprising (E) a water-soluble component having at least one carboxyl group or a salt thereof.

7. The oil-in-water emulsified cosmetic according to claim 1, which is provided in a bottle container or a bag container.

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