Oil-in-water emulsion skin cosmetic

Abstract

This invention provides an oil-in-water emulsion skin cosmetic for use on wet skin, which, even when applied to wet skin such as after bathing, blends well with the skin and spreads easily throughout the body, and maintains good moisturizing properties and a moist feeling even after towel-drying and over time. [Solution] The oil-in-water emulsion skin cosmetic is used on wet skin and contains (A) squalane, (B) diglycerin, (C) one or more water-soluble solvents selected from the group consisting of glycols, glycerins, sugars and sugar derivatives (excluding component (B)), (D) polyethylene glycol, and (E) one or more selected from the group consisting of carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers, in an amount of 0.05% to 0.5% by mass of the total mass of the oil-in-water emulsion skin cosmetic.

Description

Technical Field

[0005] , ,

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

Background Art

[0002] Conventionally, various skin care cosmetics have been used for the skin of the face, body, etc. for the purpose of moisturizing and preventing rough skin. In particular, body skin care cosmetics for the whole body are required to have an excellent moisturizing effect and be easy to apply over a wide application area.

[0003] In addition, the amount of moisture evaporation from the skin immediately after washing, such as after taking a bath, is high and the skin is prone to drying, so it is very important to moisturize the wet skin immediately. Also, due to the simplicity for use on the whole body and the lack of concern about contamination of clothes, there is a demand for a skin care cosmetic to be applied to the wet skin during bathing.

[0004] Various skin care cosmetics to be applied to the wet skin during bathing have been proposed. For example, in Patent Document 1, a moisturizing composition for bath water containing ceramide or the like diluted in hot water and applied to the body is disclosed. In Patent Document 2, an external preparation for oily skin containing an oil component, petrolatum, an aliphatic alcohol, and polyethylene, which does not drip, is not sticky, is well water-compatible when applied to wet skin, remains on the skin without easily falling off, and has excellent occlusivity and moisturizing properties, is disclosed. In Patent Document 3, a body cosmetic containing an oily component and glycerin, which has good elongation when directly applied to wet skin and has good moisturizing effects such as a moist feeling, a moist feeling, and a smooth feeling after use, is disclosed. In Patent Document 4, an oil-in-water type skin cosmetic for wet skin containing an oil component, isostearic acid, a nonionic surfactant, etc., which is easy to apply to the body in addition to having an excellent moisturizing effect, is proposed. However, the skin care cosmetics disclosed in Patent Documents 1 to 4 are not satisfactory from the viewpoint of ease of application to wet skin.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2001-354541 [Patent Document 2] Japanese Patent Publication No. 2009-46468 [Patent Document 3] Japanese Patent Publication No. 2009-40724 [Patent Document 4] Japanese Patent Publication No. 2011-136963 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] This invention was made in view of the above circumstances, and aims to provide an oil-in-water emulsion skin cosmetic for use on wet skin that, even when applied to wet skin such as after bathing, blends well with the skin and spreads easily throughout the body, and maintains good moisturizing properties and a moist feeling even after towel drying and over time. [Means for solving the problem]

[0007] As a result of diligent research to achieve the above objectives, we discovered that the above objectives can be solved by combining the oily component squalane with the aqueous component diglycerin and one or more water-soluble solvents selected from glycols, glycers, sugars, and sugar derivatives, and one or more selected from the group consisting of polyethylene glycol, carboxyvinyl polymer, and alkyl-modified carboxyvinyl polymer, thereby completing the present invention.

[0008] [1] An oil-in-water emulsion skin cosmetic used on wet skin, An oil-in-water emulsion skin cosmetic characterized by containing the following ingredients (A) to (E). (A) Squalane (B) Diglycerin (C) One or more water-soluble solvents selected from the group consisting of glycols, glycerols, sugars, and sugar derivatives (excluding component (B)). (D) Polyethylene glycol (E) One or more selected from the group consisting of carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers, in an amount of 0.05% to 0.5% by mass of the total mass of the oil-in-water emulsion skin cosmetic. [2] The oil-in-water emulsion skin cosmetic according to [1] above, wherein the sum of the content of component (B) and the content of component (C) ((B) + (C)) in the total mass of the oil-in-water emulsion skin cosmetic is 5% by mass or more and 30% by mass or less. [3] The oil-in-water emulsion skin cosmetic according to [1] or [2] above, wherein the ratio of the content of component (B) to the content of component (C) in the total mass of the oil-in-water emulsion skin cosmetic ((B) / (C)) is 0.3 to 3.0. [Effects of the Invention]

[0009] According to the oil-in-water emulsion skin cosmetic of the present invention, even when applied to wet skin such as after bathing, the formulation blends well with the skin and spreads easily over the entire body, and maintains good moisturizing properties and a moist feeling even after towel-drying and over time. [Modes for carrying out the invention]

[0010] The embodiments will be described in detail below, but the present invention is not limited to the embodiments described below. The present invention is not limited to each of the configurations described below, and various modifications are possible within the scope of the claims, and embodiments and examples obtained by appropriately combining the technical means disclosed in different embodiments and examples are also included in the technical scope of the present invention. Furthermore, unless otherwise specified in this specification, "A to B" representing a numerical range means "greater than or equal to A and less than or equal to B".

[0011] The oil-in-water emulsion skin cosmetic according to this embodiment is for use on wet skin and contains (A) squalane, (B) diglycerin, (C) one or more water-soluble solvents selected from the group consisting of glycols, glycerins, sugars and sugar derivatives (excluding component (B)), (D) polyethylene glycol, and (E) one or more selected from the group consisting of carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers.

[0012] <(A) Squalane> The component (A) used in the oil-in-water emulsion skin cosmetic according to this embodiment is squalane. This component is added to improve the blendability with wet skin and spreadability over the entire body, and to contribute to a moist feeling and retention of moisture.

[0013] The amount of component (A) used in the oil-in-water emulsion skin cosmetic according to this embodiment is preferably 1% by mass or more and 30% by mass or less, and more preferably 4% by mass or more and 20% by mass or less, relative to the total composition of the oil-in-water emulsion skin cosmetic. If the amount of component (A) is 1% by mass or more, it provides a good moisturizing sensation, and if it is 30% by mass or less, it blends well with wet skin.

[0014] (B) Diglycerin The component (B) used in the oil-in-water emulsion skin cosmetic according to this embodiment is diglycerin. This component is added as an ingredient that contributes to good absorption into wet skin.

[0015] The amount of component (B) used in the oil-in-water emulsion skin cosmetic according to this embodiment is preferably 2% by mass or more and 25% by mass or less of the total composition of the oil-in-water emulsion skin cosmetic. If the amount of component (B) is 2% by mass or more, it provides a good moisturizing effect, maintains a moisturizing effect, and blends well with wet skin, and if it is 25% by mass or less, it spreads well over the whole body.

[0016] <One or more water-soluble solvents selected from the group consisting of (C) glycols, glycerins, saccharides, and sugar derivatives (excluding the component (B))> The component (C) used in the oil-in-water emulsified skin cosmetic according to the present embodiment is at least one water-soluble solvent selected from the group consisting of glycols, glycerins excluding diglycerin, saccharides, and sugar derivatives. This component is added as a component that contributes to the good affinity for wet skin. In addition, the glycols, glycerins, saccharides, and sugar derivatives used as the component (C) may be used alone or in combination of two or more.

[0017] Examples of the glycols include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,3-butylene glycol, hexylene glycol, isoprene glycol, and the like.

[0018] Examples of the glycerins include glycerin, polyglycerin-3, polyglycerin-4, polyglycerin-6, polyglycerin-10, and the like.

[0019] Examples of the saccharides include sorbitol, maltitol, maltose, fructose, xylitol, maltotriose, threitol, erythritol, glucose, and the like. Examples of the sugar derivatives include methyl glucoside, ethyl glucoside, and the like.

[0020] The blending amount of the component (C) used in the oil-in-water emulsified skin cosmetic according to the present embodiment is preferably 4% by mass or more and 20% by mass or less in the total composition with respect to the entire oil-in-water emulsified skin cosmetic. If the blending amount of the component (C) is 4% by mass or more, the imparting and retention of a moist feeling and the good affinity for wet skin are achieved. If it is 20% by mass or less, the spreadability over the whole body is good. When two or more of glycols, glycerins, saccharides, and sugar derivatives are used as the component (C), the blending amount is the total of the two or more.

[0021] <(D) polyethylene glycol> The component (D) used in the oil-in-water emulsion skin cosmetic according to this embodiment is polyethylene glycol. This component is added to contribute to good absorption into wet skin and retention of moisture.

[0022] The amount of component (D) used in the oil-in-water emulsion skin cosmetic according to this embodiment is preferably 0.1% by mass or more and 1.0% by mass or less of the total composition of the oil-in-water emulsion skin cosmetic. If the amount of component (D) is 0.1% by mass or more, the moist feeling will be maintained even after time has passed, and if it is 1.0% by mass or less, it will spread well over the whole body.

[0023] <(E) One or more selected from the group consisting of carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers> The component (E) used in the oil-in-water emulsion skin cosmetic according to this embodiment is at least one component selected from the group consisting of carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers. This component is added as an ingredient that contributes to ease of application to wet skin.

[0024] The amount of component (E) used in the oil-in-water emulsion skin cosmetic according to this embodiment is: The amount of component (E) is between 0.05% by mass and 0.5% by mass of the total composition of the skin cosmetic. If the amount of component (E) is 0.05% by mass or more, it can be applied to the whole body without dripping, and if it is 0.5% by mass or less, it spreads well on the whole body.

[0025] In the oil-in-water emulsion skin cosmetic composition according to this embodiment, it is preferable that the sum of the contents of component (B) and component (C) ((B) + (C)) is 5% by mass or more and 30% by mass or less. If the sum of the contents ((B) + (C)) is 5% by mass or more and 30% by mass or less, the blendability with wet skin will be better.

[0026] Furthermore, in the oil-in-water emulsion skin cosmetic composition according to this embodiment, the ratio of the content of component (B) to the content of component (C) ((B) / (C)) is preferably 0.3 to 3.0. When the content ratio ((B) / (C)) is 0.3 to 3.0, the blendability with wet skin and the spreadability over the whole body are improved.

[0027] The oil-in-water emulsion skin cosmetic according to this embodiment contains (A) squalane, (B) diglycerin, (C) one or more water-soluble solvents selected from the group consisting of glycols, glycerins, sugars, and sugar derivatives (excluding component (B)), (D) polyethylene glycol, and (E) one or more selected from the group consisting of carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers, in an amount of 0.05% to 0.5% by mass of the total mass of the oil-in-water emulsion skin cosmetic. As a result, even when applied to wet skin such as after bathing, the formulation blends well with the skin and spreads easily over the entire body, and maintains good moisturizing properties and a moist feeling even after towel drying and over time.

[0028] <Other ingredients> In addition to the above-mentioned components, the oil-in-water emulsion skin cosmetic composition according to this embodiment may optionally contain other components that are generally incorporated into cosmetics, provided that they do not impair the effects of the present invention. Examples of such components include anionic surfactants, nonionic surfactants, oils, UV absorbers, preservatives, humectants, polymers, amino acid derivatives, vitamins, solid oils and fats, waxes, silicones, water, fragrances, alcohols, thickeners, colorants, metal ion chelating agents, antioxidants, and pharmaceuticals.

[0029] The oil-in-water emulsion skin cosmetic composition according to this embodiment can be manufactured by conventional methods. The oil-in-water emulsion skin cosmetic composition of the present invention is not limited to general cosmetics, but includes quasi-drugs, designated quasi-drugs, topical pharmaceuticals, etc. [Examples]

[0030] Next, the oil-in-water emulsion skin cosmetic composition according to this embodiment will be described in detail based on examples, but is not limited thereto. Prior to the examples, the test methods and evaluation methods used in each example will be described.

[0031] Ten male and female subjects immersed their forearms, which had been washed with soap, in 40°C water for 5 minutes. Then, they spread 1.0g of the sample over the entire inner surface of their wet forearms with their hands and wiped it off with a towel. Sensory evaluations were conducted based on the following evaluation points regarding the ease of spreading, how well the sample blended into wet skin, the moist feeling of the inner surface of the forearm immediately after wiping with a towel, and whether the moist feeling of the inner surface of the forearm was maintained after approximately 5 hours. The average sensory evaluation score of the ten male and female subjects was used as the score.

[0032] <Ease of stretching> (Evaluation Criteria) 5 points: It spreads very well. 4 points: It spreads well. 3 points: Slightly stretchy. 2 points: It doesn't stretch well. 1 point: It stretches very poorly.

[0033] <Excellent blendability on wet skin> (Evaluation Criteria) 5 points: It blends into the skin very well. 4 points: It blends well into the skin. 3 points: It blends into the skin fairly well. 2 points: It doesn't blend well into the skin. 1 point: It doesn't blend into the skin very well.

[0034] <The moist feeling immediately after wiping with a towel> (Evaluation Criteria) 5 points: Very moisturizing. 4 points: It moisturizes well. 3 points: Slightly moist. 2 points: It's not very moisturizing. 1 point: It doesn't moisturize well.

[0035] <Is the moisturizing effect maintained after approximately 5 hours?> (Evaluation Criteria) 5 points: It retains its moisture very well. 4 points: The moisturizing effect is maintained. 3 points: It retains a slightly moist texture. 2 points: It doesn't retain moisture very well. 1 point: It doesn't retain its moisturizing properties.

[0036] (Examples 1-17, Comparative Examples 1-7) Oil-in-water emulsion skin cosmetics with the compositions shown in Tables 1 and 2 were prepared and evaluated by sensory assessment. The results are also shown in Table 1. Note that the amounts used in all the following examples and comparative examples are all in mass percent.

[0037] [Table 1]

[0038] [Table 2]

[0039] As is clear from Tables 1 and 2, Examples 1 to 17 all obtained superior evaluation results compared to Comparative Examples 1 to 7.

[0040] The following are other formulation examples of the oil-in-water emulsion skin cosmetic according to this embodiment. For these oil-in-water emulsion skin cosmetics, we examined each of the above-mentioned aspects: ease of spreadability, ease of absorption into wet skin, moisturizing effect, and retention of moisturizing effect.

[0041] Formula Example 1: Body Milk (by mass %) (1) Squalane 8.0 (2) Diglycerin 5.0 (3) Glycerin 6.0 (4) Dipropylene glycol 4.0 (5) PEG-20 0.3 (6) Carboxyvinyl polymer 0.2 (7) Sodium N-stearoyl glutamate 1.0 (8) Behenyl alcohol 1.0 (9) Stearic acid 1.0 (10) Octyldodecyl myristate 2.0 (11) Glyceryl monostearate 1.5 (12) Cholesterol 0.2 (13) Dimethicone 2.5 (14) EDTA-2Na 0.1 (15) Methylparaben 0.1 (16) Hawthorn extract 0.1 (17) Hot spring water 0.1 (18) Unshu mandarin peel extract 0.1 (19) Angelica root extract 0.1 (20) Loquat leaf extract 0.1 (21) Purified water remainder

[0042] A body milk with the above composition was prepared using a conventional method, and its spreadability, skin compatibility, moisturizing effect, and moisture retention were evaluated. All of these characteristics were excellent, yielding favorable results.

[0043] Formula Example 2: Body Cream (by mass) (1) Squalane 4.0 (2) Diglycerin 8.0 (3) Glycerin 6.0 (4) 1,3-Butylene glycol 4.0 (5) Sorbitol 1.0 (6) PEG-20 0.5 (7) Carboxyvinyl polymer 0.2 (8) Sodium N-stearoyl glutamate 1.5 (9) Behenyl alcohol 1.0 (10) Stearic acid 1.0 (11) Octyldodecyl myristate 2.0 (12) Glyceryl monostearate 1.0 (13) Mineral oil 3.0 (14) Dimethicone 2.0 (15) K hydroxide 0.1 (16) EDTA-2Na 0.1 (17) Methylparaben 0.1 (18) Aloe vera juice 0.1 (19) Hawthorn extract 0.1 (20) Hot spring water 0.1 (21) Unshu mandarin peel extract 0.1 (22) Angelica root extract 0.1 (23) Loquat leaf extract 0.1 (24) Purified water remainder

[0044] A body cream with the above composition was prepared using a conventional method, and its spreadability, skin absorption, moisturizing effect, and moisture retention were evaluated. All of these properties were excellent, resulting in favorable results.

Claims

1. An oil-in-water emulsion skin cosmetic used on wet skin, An oil-in-water emulsion skin cosmetic characterized by containing the following ingredients (A) to (E). (A) Squalane (B) Diglycerin (C) One or more water-soluble solvents selected from the group consisting of glycols, glycerols, sugars, and sugar derivatives (excluding component (B)). (D) Polyethylene glycol (E) One or more selected from the group consisting of carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers, in an amount of 0.05% to 0.5% by mass of the total mass of the oil-in-water emulsion skin cosmetic.

2. The oil-in-water emulsion skin cosmetic according to claim 1, wherein the sum of the content of component (B) and the content of component (C) ((B) + (C)) in the total mass of the oil-in-water emulsion skin cosmetic is 5% by mass or more and 30% by mass or less.

3. The oil-in-water emulsion skin cosmetic according to claim 1 or 2, wherein the ratio of the content of component (B) to the content of component (C) in the total mass of the oil-in-water emulsion skin cosmetic ((B) / (C)) is 0.3 to 3.0.

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