Oil-in-water type emulsified cosmetic

Abstract

To provide an oil-in-water type emulsified cosmetic which imparts a refreshing and shiny finish to the skin during application, ensures lasting moisturization without stickiness, and exhibits superior high-temperature stability.SOLUTION: An oil-in-water type emulsified cosmetic comprises the following component (A), component (B), component (C), component (D), component (E), and water. (A) Oil agent having a melting point of 30 to 50°C: 2 to 10 mass%. (B) Oil agent having a melting point of 60 to 75°C: 0.5 to 6 mass%. (C) Acrylic acid-based polymer: 0.2 to 1.5 mass%. (D) Glycerin mono-fatty acid ester: 0.5 to 3 mass%. (E) Polyoxyethylene sorbitan monooleate: 0.1 to 2 mass%.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic preparation. [Background technology]

[0002] Skin care aimed at moisturizing the skin basically involves multiple steps, and the moisturizing effect can be enhanced by providing the skin with a balanced supply of water and oil. The skin care procedure begins with the use of a lotion to provide moisture and moisturizing ingredients to moisturize the skin, and then a milky lotion or cream is used to replenish the oil content, suppressing moisture loss from the skin and maintaining the moisturizing effect. However, skin care using multiple items like this takes time, so all-in-one cosmetics are popular among consumers who want to shorten their skin care time and perform skin care more efficiently.

[0003] An all-in-one cosmetic is a cosmetic that combines the functions of multiple skin care items such as lotion, milky lotion, and cream, and allows a user to complete their skin care routine with just the all-in-one cosmetic. All-in-one cosmetic products are required to have a fresh feel on use like lotion, an emollient feel like milky lotion or cream, and a long-lasting moisturizing effect. If a large amount of moisturizer or oil is added to maintain the moisturizing effect, it will cause an unpleasant stickiness, so it is necessary to maintain the moisturizing effect without the stickiness.

[0004] Furthermore, because all-in-one cosmetics allow skin care to be performed in a short time, they are often used for skin care before applying makeup in the morning. Skin care before applying makeup is an important step that determines the finish of the makeup, and it is required not only to moisturize the skin and improve the application of makeup, but also to make the skin look beautiful. In recent years, a glossy finish that gives a youthful and healthy impression has become popular, but skin that is shiny or glistening gives the impression of lacking cleanliness. Therefore, there is a demand for all-in-one cosmetics that give skin a natural glossy finish.

[0005] Patent Document 1 discloses an oil-in-water emulsion cosmetic that contains a large amount of a paste-like oil to enhance the moisturizing effect. Although the oil-in-water emulsion cosmetic of Patent Document 1 contains a large amount of a paste-like oil, it is excellent in moisture and can maintain the moisturizing effect without being sticky. However, the large amount of paste-like oil is likely to cause shine, and is insufficient in terms of finishing the skin with a glossy feel.

[0006] Patent Document 2 discloses an oil-in-water emulsion composition containing polyoxyethylene hydrogenated castor oil, a nonionic surfactant with a weighted average HLB of 9 to 11, a polar oil with an organic value of 700 or more and an IOB value of 0.07 or more, a polyhydric alcohol other than dipropylene glycol, an alkylene oxide derivative, and water, and the average particle size of the emulsion particles is 200 nm or less. The oil-in-water emulsion composition of Patent Document 2 contains a polar oil to impart a glossy feel when applied without stickiness, but the durability of the moisturizing effect is insufficient. In addition, although this composition has excellent stability over time at room temperature, its stability under high temperature conditions may be poor. As described above, it is difficult to achieve both a sustained moisturizing effect and a glossy feeling on the skin after application, and conventional technologies have not provided the sufficient functionality required for an all-in-one cosmetic preparation. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2021-91636 [Patent Document 2] JP 2023-89638 A Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention aims to provide an oil-in-water emulsion cosmetic which leaves the skin fresh and lustrous when applied, has a sustained moisturizing effect without stickiness, and is excellent in high-temperature stability. [Means for solving the problem]

[0009] Means for Solving the Problems The present inventors have conducted intensive research to solve the above problems, and as a result have found that the above problems can be solved by an oil-in-water emulsion cosmetic composed of specific components, thereby completing the present invention. That is, the present invention is as follows [1].

[0010] [1] An oil-in-water emulsion cosmetic preparation containing the following components (A), (B), (C), (D), and (E) and water. (A) Oil having a melting point of 30 to 50°C: 2 to 10% by mass (B) Oil having a melting point of 60 to 75°C: 0.5 to 6% by mass (C) Acrylic acid-based polymer: 0.2 to 1.5% by mass (D) Glycerol mono fatty acid ester: 0.5 to 3% by mass (E) Polyoxyethylene sorbitan monooleate: 0.1 to 2% by mass Effect of the Invention

[0011] According to the present invention, it is possible to provide an oil-in-water emulsion cosmetic which leaves the skin fresh and lustrous when applied, has a sustained moisturizing effect without stickiness, and is excellent in high-temperature stability. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described. In this specification, any numerical range defined using the symbol "~" is intended to include both the upper and lower limits of the range. For example, "2~5" means 2 or more and 5 or less. The oil-in-water emulsion cosmetic of the present invention contains the following components (A), (B), (C), (D) and (E). Each component will be described below.

[0013] (Component (A): Oil with a melting point of 30 to 50°C) The component (A) used in the present invention is an oil having a melting point of 30 to 50°C, and is not limited as long as it is used in general cosmetics. The component (A) may be used alone or in combination of two or more. The melting point of the oil can be measured by the second method of melting point measurement described in the Standards for Quasi-Drug Raw Materials. Examples of component (A) include dipentaerythrityl tetra(hydroxystearic acid / isostearic acid) (melting point 50°C), dipentaerythrityl hexahydroxystearate (melting point 45°C), phytosteryl macadamiate (melting point 45°C), myristyl myristate (melting point 41 to 45°C), tri(caprylic acid / capric acid / myristic acid / stearic acid)glyceryl (melting point 40°C), dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate (melting point 40°C), dipentaerythrityl hexa(hydroxystearic acid / stearic acid / rosin acid) (melting point 37°C), dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl) (melting point 40°C), shea butter (melting point 34 to 44°C), and the like. Among these, from the viewpoint of imparting a glossy feeling to the skin, it is preferable to use myristyl myristate and tri(caprylic acid / capric acid / myristic acid / stearic acid)glyceryl in combination, and it is more preferable to use myristyl myristate, tri(caprylic acid / capric acid / myristic acid / stearic acid)glyceryl, and macadamia nut fatty acid phytosteryl in combination. When myristyl myristate and tri(caprylic acid / capric acid / myristic acid / stearic acid)glyceryl are used in combination, the ratio of myristyl myristate:tri(caprylic acid / capric acid / myristic acid / stearic acid)glyceryl is preferably 7:1 to 2:1 by mass ratio, more preferably 5:1 to 3:1. When myristyl myristate, tri(caprylic / capric / myristic / stearic acid)glyceryl, and phytosteryl macadamiate are used in combination, the ratio of myristyl myristate:tri(caprylic / capric / myristic / stearic acid)glyceryl:phytosteryl macadamiate by mass is preferably 8:1:1 to 2:1:1, and more preferably 6:1:1 to 3:1:1.

[0014] The content of component (A) in the oil-in-water emulsion cosmetic of the present invention is 2 to 10% by mass, preferably 3 to 9% by mass, and more preferably 4 to 8% by mass. If the content of component (A) is too low, the moisturizing effect may not last long enough, whereas if the content of component (A) is too high, the moisturizing feeling upon application may decrease and greasiness may occur.

[0015] (Component (B): Oil with a melting point of 60 to 75°C) The component (B) used in the present invention is an oil having a melting point of 60 to 75° C., and is not limited as long as it is used in general cosmetics. The component (B) may be used alone or in combination of two or more kinds. Examples include beeswax (melting point 63.5° C.), candelilla wax (melting point 69° C.), hydrogenated jojoba oil (melting point 68° C.), phytosteryl hydroxystearate (melting point 67° C.), behenyl alcohol (melting point 65° C.), stearic acid (melting point 69.5° C.), etc. Among these, beeswax and behenyl alcohol are preferred, and it is more preferred to use beeswax and behenyl alcohol in combination. The content of component (B) in the oil-in-water emulsion cosmetic of the present invention is 0.5 to 6% by mass, preferably 1 to 5% by mass, and more preferably 1.5 to 4% by mass. If the content of component (B) is too low, the duration of the moisturizing effect and the high-temperature stability may be insufficient, while if the content of component (B) is too high, the freshness upon application may decrease, and shine and stickiness may occur.

[0016] <Component (C): Acrylic Acid-Based Polymer> The component (C) used in the present invention is an acrylic acid-based polymer. The component (C) may be used alone or in combination of two or more. Examples of the component (C) include starch-sodium acrylate graft polymer, poly(meth)acrylic acid, (meth)acrylic acid-alkyl (meth)acrylate copolymer, and the like. Of these, it is preferable to use starch-sodium acrylate graft polymer, since it provides a natural, glossy finish to the skin and is non-sticky.

[0017] Starch-sodium acrylate graft polymer is a sodium salt of acrylic acid grafted onto corn-derived starch. Specifically, commercially available products such as Saranjur ST-100SP and Saranjur ST-100MC (manufactured by Sanyo Chemical Industries, Ltd.) can be used. The poly(meth)acrylic acid is preferably a carboxyvinyl polymer, which is a crosslinked polyacrylic acid obtained by crosslinking a polymer containing acrylic acid or methacrylic acid as a constituent monomer with an allyl compound. Specifically, commercially available products such as Carbopol Ultrez 10 Polymer and Carbopol 940 (both manufactured by Lubrizol Japan, Inc.) and AQUPEC HV-505E (manufactured by Sumitomo Seika Chemicals Co., Ltd.) can be used. The (meth)acrylic acid-alkyl (meth)acrylate copolymer is a copolymer of (meth)acrylic acid and an alkyl (meth)acrylate, and the number of carbon atoms in the alkyl group is 1 to 30, preferably 8 to 30. Among these, an acrylic acid-alkyl methacrylate copolymer is preferred, an acrylic acid-C10-30 alkyl methacrylate copolymer is more preferred, and an alkyl-modified carboxyvinyl polymer, which is a crosslinked polyacrylic acid crosslinked with an allyl compound, is most preferred. Specifically, commercially available products such as Carbopol Ultrez 21 Polymer, Carbopol ETD2020 (both manufactured by Lubrizol Japan, Inc.), AQUPEC HV-501ER, and AQUPEC HV-801ERK (both manufactured by Sumitomo Seika Chemicals Co., Ltd.) can be used. The content of component (C) in the oil-in-water emulsion cosmetic of the present invention is 0.2 to 1.5% by mass, preferably 0.3 to 1.2% by mass, and more preferably 0.5 to 1% by mass. If the content of component (C) is too low, high-temperature stability may be insufficient, while if the content of component (C) is too high, the skin may not have a sufficient luster or may feel less moisturized upon application.

[0018] <Component (D): Glycerol mono fatty acid ester> The component (D) used in the present invention is a monoester of glycerin and a fatty acid, such as myristic acid, stearic acid, isostearic acid, oleic acid, and behenic acid, with stearic acid being preferred. The content of component (D) in the oil-in-water emulsion cosmetic of the present invention is 0.5 to 3 mass%, preferably 0.6 to 2 mass%, and more preferably 0.7 to 1.5 mass%. If the content of component (D) is too low, high temperature stability and skin gloss may be insufficient, whereas if the content of component (D) is too high, the freshness upon application may be reduced.

[0019] <Component (E): Polyoxyethylene sorbitan monooleate> The component (E) used in the present invention is polyoxyethylene sorbitan monooleate. Polyoxyethylene sorbitan monooleate is obtained by addition polymerization of ethylene oxide to sorbitan monooleate, and the number of moles of ethylene oxide added is 20. The content of component (E) in the oil-in-water emulsion cosmetic of the present invention is 0.1 to 2 mass%, preferably 0.15 to 1 mass%, and more preferably 0.2 to 0.8 mass%. If the content of component (E) is too low, the high temperature stability may decrease, and if the content of component (E) is too high, stickiness may occur. The ratio (A) / ((D)+(E)) of the content of the component (A) to the sum of the contents of the components (D) and (E) is preferably 2 to 9, more preferably 3 to 8, and even more preferably 4 to 6, from the viewpoint of improving high-temperature stability.

[0020] <water> In the oil-in-water emulsion cosmetic of the present invention, the remainder other than the above-mentioned components (A), (B), (C), (D), and (E), and the additive components described below that are blended as necessary, is water. The water is not particularly limited, but for example, ion-exchanged water, purified water, etc. can be used. The content of water is not particularly limited, but in the oil-in-water emulsion cosmetic, it is, for example, 10 to 98% by mass, preferably 50 to 90% by mass, and more preferably 60 to 80% by mass.

[0021] <Other added ingredients> The oil-in-water emulsion cosmetic of the present invention may contain, in addition to the above components (A) to (E), components that are used in general cosmetics as additive components. Examples of other additive components include moisturizers, pH adjusters, antioxidants, sequestering agents, colorants, fragrances, pigments, and the like.

[0022] The oil-in-water emulsion cosmetic of the present invention is a cosmetic in which an oil phase is dispersed in a continuous aqueous phase, and is formed by emulsifying an oil component and an aqueous component, and can be produced by a known method. For example, the oil-in-water emulsion cosmetic of the present invention can be produced by mixing an oil having a melting point of 30 to 50°C as component (A), an oil having a melting point of 60 to 75°C as component (B), an acrylic acid-based polymer as component (C), a glycerin mono-fatty acid ester as component (D), polyoxyethylene sorbitan monooleate as component (E), water, etc., heating the mixture to homogeneity, and then stirring and cooling the mixture to approximately room temperature. EXAMPLES

[0023] The present invention will now be described in more detail with reference to examples and comparative examples.

[0024] Examples 1 to 14 and Comparative Examples 1 to 14 The oil-in-water emulsion cosmetics shown in Table 1 (Examples 1 to 14) and Table 2 (Comparative Examples 1 to 14) were prepared by known methods and evaluated by the following methods. The common additive components in Tables 1 and 2 are the five components shown in Table 3. The raw materials shown below were used for each component shown in Tables 1 and 2. The numerical values ​​corresponding to each component in Tables 1 and 2 indicate the content (mass%) of each component relative to the total amount of the oil-in-water emulsion cosmetic, and "-" in the tables indicates that the component is not contained.

[0025] Component (A) · Myristyl Myristate, "ULTIMOPURE CRODAMOL MM-PA-(LP)" manufactured by Croda Japan Co., Ltd., melting point 43°C · Glyceryl Tri(caprylic / capric / myristic / stearic acid), "SALACOS 334" manufactured by Nisshin Oillio Group, Ltd., melting point 40°C · Phytosteryl Macadamia Nut Fatty Acids, "Plandool-MAS" manufactured by Nippon Seika Co., Ltd., melting point 45°C

[0026] (B) component · Behenyl Alcohol, "NAA-422" manufactured by NOF Corporation, melting point 65°C · Beeswax, "ULTIMOPURE BEESWAX-PA-(JP)" manufactured by Croda Japan Co., Ltd., melting point 63.5°C

[0027] (C) component · Sodium Acrylate Grafted Starch (Starch-Sodium Acrylate Graft Polymer), "SALANJULE 100-SP" manufactured by Sanyo Chemical Industries, Ltd. · Carbomer (Carboxyvinyl Polymer), "Carbopol® Ultrez 10 Polymer" manufactured by Lubrizol Corporation · (Acrylates / Alkyl Acrylate (C10-30)) Crosspolymer (Alkyl-Modified Carboxyvinyl Polymer), "Carbopol® Ultrez 21 Polymer" manufactured by Lubrizol Corporation

[0028] (D) component · Glyceryl Stearate, "SUNSOFT No2500" manufactured by Sun Chemical Corporation (D’) component · Sorbitan Stearate, "NONION SP-60RP Pellets" manufactured by NOF Corporation

[0029] (E) component · Polysorbate 80 (Polyoxyethylene Sorbitan Monooleate), "NOFABLE ESO-8520" manufactured by NOF Corporation (E’) component · Polysorbate 60 Monostearate Polyoxyethylene Sorbitan Manufactured by Toho Chemical Industry Co., Ltd., "Solvon T-60"

[0030] 〈Evaluation Items and Criteria〉 Regarding the following items, evaluations were conducted, and based on the total score of each evaluation point, a four-level evaluation of "◎" to "×" was carried out as follows. <Four-Level Evaluation Based on Total Evaluation> ◎: Total score is 35 points or more ○: Total score is 25 points or more and less than 35 points △: Total score is 15 points or more and less than 25 points ×: Total score is less than 15 points

[0031] (1) Freshness during application Twenty women (aged 24 to 55) were used as panelists, and after washing their faces, the freshness when applying an oil-in-water emulsion cosmetic (about 2 g) was judged as follows. 2 points: When it was felt that the feeling during application to the skin was very fresh. 1 point: When it was felt that the feeling during application to the skin was fresh. 0 points: When no freshness was felt during application to the skin.

[0032] (2) Glossiness Twenty women (aged 24 to 55) were used as panelists, and after washing their faces, an oil-in-water emulsion cosmetic (about 2 g) was applied, and the glossiness of the skin after application was judged as follows. 2 points: When glossiness was felt on the skin. 1 point: When a slight glossiness was felt on the skin. 0 points: When there was a shiny feeling (greasiness) on the skin or no glossiness.

[0033] (3) Non-stickiness Twenty women (aged 24 to 55) were used as panelists, and after washing their faces, an oil-in-water emulsion cosmetic (about 2 g) was applied, and the texture of the skin after application was judged as follows. 2 points: When it was felt that the skin was not sticky. 1 point: When it was felt that the skin was slightly sticky. 0 points: If your skin feels sticky.

[0034] (4) Long-lasting moisturizing effect Twenty women (aged 24 to 55) were used as panelists. After washing their faces, they applied an oil-in-water emulsion cosmetic (approximately 2 g) and judged the moisturizing feeling of the skin after 8 hours as follows. 2 points: If your skin feels sufficiently moisturized, just like immediately after use. 1 point: If you feel that your skin is slightly less moisturized than immediately after use. 0 points: If you feel that your skin is clearly less moisturized than immediately after use.

[0035] (5) High temperature stability After storage at 40°C for one month, the fluidity and appearance were visually checked for changes, and the stability was judged as follows. ⊚: No change in fluidity or appearance such as separation, and good stability. ◯: There is slight fluidity, but there is no change in appearance such as separation, and the stability is generally good. ×: Separation was observed and stability was poor.

[0036] [Table 1]

[0037] [Table 2] In Comparative Example 1, the amount of component (A) exceeded the upper limit, so that the freshness was reduced and shine occurred when applied, and the high-temperature stability was also reduced. In Comparative Example 2, the content of component (A) was below the lower limit, and therefore the moisturizing effect did not last long enough. In Comparative Example 3, since component (A) was not blended, the skin gloss and moisturizing effect were insufficient. In Comparative Example 4, the amount of component (B) exceeded the upper limit, so that the moisturizing effect was reduced and the skin became shiny and sticky upon application. In Comparative Example 5, since the component (B) was not blended, the durability of the moisturizing effect and the high-temperature stability were insufficient. In Comparative Example 6, the amount of component (C) exceeded the upper limit, so the skin gloss and freshness upon application were insufficient. In Comparative Example 7, since component (C) was not blended, the freshness upon application and the high-temperature stability were insufficient. In Comparative Example 8, the amount of component (D) exceeded the upper limit, so the freshness at the time of application was reduced. In Comparative Example 9, the amount of component (D) was less than the lower limit, and therefore the high-temperature stability was reduced. In Comparative Example 10, the component (D) was not blended, and therefore the high temperature stability was reduced. Comparative Example 11 used component (D') instead of component (D), and therefore the skin gloss was insufficient. In Comparative Example 12, the component (E) exceeded the upper limit, causing stickiness. In Comparative Example 13, since component (E) was not blended, the high temperature stability was reduced. Comparative Example 14 used component (E') instead of component (E), and therefore was insufficient in terms of freshness and non-stickiness upon application.

[0038] [Table 3]

[0039] As shown in Table 1, the oil-in-water emulsion cosmetic of the present invention containing components (A) to (E) in the specified ranges left the skin feeling fresh and lustrous when applied, had sustained moisturizing effects without stickiness, and was stable at high temperatures.

Claims

[Claim 1] An oil-in-water emulsion cosmetic comprising the following components (A), (B), (C), (D), and (E) and water. (A) Oil having a melting point of 30 to 50°C: 2 to 10% by mass (B) Oil having a melting point of 60 to 75°C: 0.5 to 6% by mass (C) Acrylic acid-based polymer: 0.2 to 1.5% by mass (D) Glycerin mono fatty acid ester: 0.5 to 3 mass% (E) Polyoxyethylene sorbitan monooleate: 0.1 to 2% by mass

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