Topical skin components

Abstract

To provide a self-foaming topical skin composition that is gentle on the skin due to its dense foam, spreads easily on the skin, and can be easily applied even to minute areas. [Solution] A topical skin composition comprising a bicontinuous microemulsion phase containing (A) a nonionic surfactant having an average HLB of 9 to 14, (B) an oily foaming agent, and (C) an aqueous component, wherein the boiling point of component (B) at 1 atmosphere is 22 to 36.5°C. This topical skin composition has excellent properties, such as blending well with cosmetics when used as a cosmetic and being easily washed off when used as a cleanser.

Description

Technical Field

[0001] The present invention relates to a topical skin composition that self-foams after application to the skin.

Background Art

[0002] As a topical skin composition applied to the skin, a foam composition is known. The foam composition has advantages such as being able to be applied to a large surface area at the time of administration, being easy to spread on the skin and being able to be applied to fine parts, and being able to reduce physical irritation to the skin. Therefore, such a foam-type topical skin composition is widely applied to cosmetics, detergents, and the like.

[0003] For such a foam-type topical skin composition, there are those in which air bubbles are introduced into the composition by a foam dispenser or the like, those in which the composition contains a foaming agent and foams simultaneously when sprayed by a spray or the like, or those in which the composition contains a foaming agent and self-foams after application to the skin. Among these, the self-foaming composition is preferably used because it foams slowly after application to the skin, and the generated bubbles burst to give a comfortable feeling to the skin.

[0004] On the other hand, when the foam composition is used as a cosmetic, it is desired that it is easy to blend with the skin, and when used as a detergent, it is desired that cosmetics and dirt on the skin can be easily washed away and it does not give a burden of replacement due to thick bubbles in any case.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

[0006] According to the present invention, the following inventions are provided. [1] (A) A nonionic surfactant having an average HLB of 9 to 14, (B) An oily foaming agent, and (C) An aqueous component, comprising a bicontinuous microemulsion phase comprising the same, A composition for external use on the skin, wherein the boiling point of component (B) at 1 atm is 22 to 36.5°C. [2] The composition according to [1], wherein component (B) is isopentane. [3] The composition according to [1] or [2], wherein component (A) is selected from the group consisting of polyoxyethylene hydrogenated castor oil and polyoxyethylene glycerin fatty acid ester. [4] The composition according to any one of [1] to [3], wherein the content of component (A) is 1 to 50% by mass based on the total mass of the composition. [5] The composition according to any one of [1] to [4], wherein component (A) comprises a nonionic surfactant having an HLB of 9 to 14. [6] The composition according to any one of [1] to [5], wherein the content of component (B) exceeds 0% by mass and is 15% by mass or less based on the total mass of the composition. [7] The composition according to any one of [1] to [6], further comprising an oily component selected from the group consisting of higher fatty acids, ester oils, higher aliphatic alcohols, hydrocarbon oils, and silicone oils. [8]<00000�5>The composition according to [7], wherein component (D) comprises a higher fatty acid. [9] The composition according to [8], wherein the content of the higher fatty acid exceeds 0% by mass and is 10% by mass or less based on the total mass of the composition.

[10] The composition according to any one of [1] to [9], wherein component (C) comprises (c0) water. The composition described above.

[11] The composition according to any one of [1] to

[10] , wherein component (C) comprises (c1) an ionic surfactant.

[12] The composition according to any one of [1] to

[11] , wherein component (C) comprises (c2) a sulfur-containing amino acid compound.

[13] A transparent, single-phase composition as described in any of [1] to

[12] .

[14] A cleansing agent, the composition described in any of [1] to

[13] .

[0007] According to the present invention, a self-foaming topical skin composition is provided that is non-greasy due to its dense foam, spreads easily on the skin, and can be easily applied even to minute areas. This topical skin composition has excellent properties, such as blending well with cosmetics when used as a cosmetic and being easily washed off when used as a cleanser. Specific description of the invention

[0008] The topical skin composition according to the present invention (hereinafter sometimes simply referred to as "the composition") is (A) Nonionic surfactants with an HLB of 9-14 (B) Oily foaming agent, and (C) aqueous component, It comprises the following. And, in combination with these components (A) to (C) and other components as needed, it comprises a bicontinuous microemulsion phase. The following describes each of these components and any other components that may be added.

[0009] (A) Nonionic surfactant The composition according to the present invention comprises a nonionic surfactant (hereinafter sometimes referred to as component (A)). Component (A) functions as a dispersant for stabilizing the bicontinuous microemulsion phase contained in the composition according to the present invention.

[0010] (A) component is a surfactant that does not ionize and have a charge in an aqueous solution. As the hydrophobic group, types using long-chain alkyl and types using dimethyl silicone are known. Specifically, examples of the former include glycerin fatty acid ester, ethylene oxide derivative of glycerin fatty acid ester, polyglycerin fatty acid ester, propylene glycol fatty acid ester, ethylene oxide derivative of propylene glycol fatty acid ester, polyethylene glycol fatty acid ester, polyethylene glycol alkyl ether, polyethylene glycol alkyl phenyl ether, polyethylene glycol castor oil derivative, polyethylene glycol hydrogenated castor oil derivative, etc. Examples of the latter include polyether-modified silicone, polyglycerin-modified silicone, etc. Preferably, it is a type using alkyl as the hydrophobic group.

[0011] The preferred (A) component in the present invention is selected from the group consisting of polyoxyethylene hydrogenated castor oil, which is a polyethylene glycol castor oil derivative, and polyoxyethylene glycerin fatty acid ester, which is an ethylene oxide derivative of glycerin fatty acid ester.

[0012] In the composition according to the present invention, the (A) component has an average HLB of 9 to 14, preferably 10 to 13. Generally, it is known that when the HLB is around 7, it indicates that the solubility in water and the solubility in oil are balanced. That is, the (A) component has high hydrophilic oil / water solubility. If the HLB is excessively low, when the composition is used as a detergent, good rinsing property cannot be obtained, and if it is excessively high, the solubility in oil is significantly reduced, so a stable composition cannot be formed. Also, the (A) component is preferably liquid at room temperature. In the present invention, the HLB is calculated by the Griffin method.

[0013] (A) component is selected from one nonionic surfactant with an HLB of 9 to 14, it may also be a mixture of two or more nonionic surfactants. At this time, it is only necessary that the average HLB of the nonionic surfactants to be mixed is 9 to 14. For example, a nonionic surfactant with an HLB of 8 and a nonionic surfactant with an HLB of 15 can be mixed in an appropriate ratio and used.

[0014] (A) component preferably has a content of 1 to 50% by mass, more preferably 1.5 to 40% by mass, and particularly preferably 2 to 30% by mass based on the total mass of the composition.

[0015] (B) Oil-based foaming agent The composition according to the present invention comprises an oil-based foaming agent (hereinafter sometimes referred to as component (B)). Component (B) functions as a foaming agent for self-foaming when the composition according to the present invention is applied to the skin, and also constitutes part or all of the oil phase in the composition.

[0016] (B) component needs to have a boiling point (B.P.) at 1 atm of 22 to 36.5 °C for the composition to self-foam on the skin. Examples of such oil-based foaming agents include isopentane (B.P. 27.8 °C), diethyl ether (34.6 °C), pentane (36.1 °C), etc. Among these, isopentane is particularly preferred.

[0017] (B) component preferably has a content of more than 0% by mass and 15% by mass or less, more preferably 2 to 10% by mass based on the total mass of the composition.

[0018] (C) Aqueous component The composition according to the present invention comprises an aqueous component (hereinafter sometimes referred to as component (C)). Component (C) constitutes the aqueous phase in the composition according to the present invention.

[0019] Component (C) typically comprises (c0) water. As the water, water used in cosmetics, quasi-drugs, etc., can be used, for example, purified water, deionized water, tap water, etc.

[0020] The composition according to the present invention contains water and aqueous components described later, which together form an aqueous phase. Here, it is preferable that the water content in the composition according to the present invention be relatively low. This is because if the water content is high, the content of the active ingredients in the composition becomes relatively low. For example, foamy compositions that are foamed by a pump foamer often have a relatively high water content to facilitate foaming when passing through a mesh, and compositions that are foamed by hand or with a whisk often have water mixed in before foaming. In contrast, the composition according to the present invention is self-foaming and can form sufficiently dense foam without mixing in water. Therefore, in order to fully exert the effect of the active ingredients contained in the composition, the water content (c1) in the composition according to the present invention is preferably 80% by mass or less, more preferably 70% by mass or less, and even more preferably 65% ​​by mass or less, based on the total mass of the composition.

[0021] Furthermore, component (C) may also contain a (c1) ionic surfactant. The composition according to the present invention contains component (B) as a surfactant, but a (c1) ionic surfactant may be added to improve the stability of the composition and improve the cleaning power when the composition is used as a detergent. When component (c1) is used, its type is not particularly limited, and any anionic surfactant, cationic surfactant, or amphoteric surfactant can be used.

[0022] Examples of anionic surfactants include carboxylate salts of higher fatty acids, sulfonic acid types such as α-olefin sulfonates, sulfate esters such as higher alcohol sulfates, and phosphate esters. Specifically, Fatty acid soaps (e.g., sodium laurate, sodium palmitate, etc.); Higher alkyl sulfate salts (e.g., sodium lauryl sulfate, potassium lauryl sulfate, etc.); Alkyl ether sulfate salts (e.g., POE-lauryl ether sulfate triethanolamine, POE-lauryl ether sulfate sodium, laureth sulfate sodium, etc.); N-acyl sarcosinic acid (e.g., sodium lauroyl sarcosinate); Higher fatty acid amide sulfonates (e.g., sodium N-stearoyl-N-methyltaurate, sodium N-myristoyl-N-methyltaurate, sodium cocoyl methyltaurate, sodium lauryl methyltauride, etc.); Phosphate ester salts (e.g., POE-oleyl ether sodium phosphate, POE-stearyl ether phosphate); Sulfosuccinates (e.g., sodium di-2-ethylhexyl sulfosuccinate, sodium monolauroyl monoethanolamide polyoxyethylene sulfosuccinate, sodium lauryl polypropylene glycol sulfosuccinate, etc.); Alkylbenzenesulfonates (e.g., sodium linear dodecylbenzenesulfonate, triethanolamine linear dodecylbenzenesulfonate, linear dodecylbenzenesulfonic acid, etc.); Higher fatty acid ester sulfate salts (e.g., hydrogenated coconut oil fatty acid glycerin sulfate sodium); N-acyl glutamates (e.g., monosodium N-lauroyl glutamate, disodium N-stearoyl glutamate, monosodium N-myristoyl-L-glutamate, etc.); Sulfated oils (e.g., funnel oil); POE-alkyl ether carboxylic acid; POE-alkylallyl ether carboxylate salt; α-olefin sulfonates; higher fatty acid ester sulfonates; Secondary alcohol sulfate salts; Higher fatty acid alkylolamide sulfate salts; Sodium lauroyl monoethanolamide succinate; N-palmitoyl aspartate ditriethanolamine; Sodium caseinate, etc., can be used.

[0023] Furthermore, the topical skin composition according to the present invention may contain higher fatty acids as oils, as described later. When higher fatty acids are neutralized with alkali metal hydroxides, fatty acid soaps are formed. In the present invention, the neutralized product is considered an anionic surfactant. Also, when the neutralization rate is less than 100%, the unreacted amount of higher fatty acids is considered an oil.

[0024] Examples of cationic surfactants include quaternary ammonium salts and amidoamine compounds. Specifically, Alkyltrimethylammonium salts (e.g., stearyltrimethylammonium chloride, lauryltrimethylammonium chloride, etc.); Alkylpyridinium salts (e.g., cetylpyridinium chloride); Dialkyldimethylammonium salts (e.g., distearyldimethylammonium chloride); Poly(N,N'-dimethyl-3,5-methylenepiperidinium) chloride; Alkyl quaternary ammonium salts; Alkyldimethylbenzylammonium salt; Alkylisoquinolinium salt; di Alkyl molyphonium salt; POE-alkylamine; Alkylamine salt; Polyamine fatty acid derivatives; Amyl alcohol fatty acid derivative; Benzalkonium chloride; Examples include benzethonium chloride.

[0025] Examples of amphoteric surfactants include imidazoline-based amphoteric surfactants and betaine-based surfactants. Specifically, Imidazolin-based amphoteric surfactants (e.g., 2-undecyl-N,N,N-(hydroxyethylcarboxymethyl)-2-imidazoline sodium, 2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.); Examples of betaine-based surfactants include cocamidopropyl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, lauryldimethylaminoacetic acid betaine, alkyl betaine, amide betaine, sulfobetaine, etc.

[0026] (c1) When an ionic surfactant is used, the total amount of component (c1) is preferably 0.1 to 10 times, and more preferably 1 to 5 times, the total amount of component (A) by mass.

[0027] Furthermore, component (C) may also contain a sulfur-containing amino acid compound (c2). However, in this invention, sulfur-containing amino acid compounds are not included in component (c1). A sulfur-containing amino acid compound is a compound having a substituted or unsubstituted amino group and a sulfo group, and is represented by formula (a), for example. R 1 -NH-R 2 -SO3M (a) (In the formula, R 1 is H, or an alkyl group having 1 to 3 carbon atoms. R 2 This is an alkylene group having 1 to 5 carbon atoms. (M is H, Na, or K)

[0028] Such sulfur-containing amino acid compounds improve the cleaning effect when the composition is used as a detergent. In particular, when combined with higher fatty acids, such as lauric acid, as described later, they form fatty acid soaps that exhibit excellent cleaning effects.

[0029] Among these sulfur-containing amino acid compounds, sodium N-methyltaurate or potassium N-methyltaurate are particularly preferred due to their high cleaning effect.

[0030] The composition according to the present invention may include an aqueous component other than (c1) and (c2) as component (C). Such aqueous components can be those that are normally usable in cosmetics, pharmaceuticals, etc., and can be used within a range that does not impair the stability of the emulsion. Examples of such aqueous components include humectants and water-soluble polymers.

[0031] Among these, examples of humectants include 1,3-butylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, hexylene glycol, glycerin, diglycerin, xylitol, maltitol, maltose, and D-mannitol.

[0032] Examples of water-soluble polymers include plant-derived polymers, microbial-derived polymers, animal-derived polymers, starch-derived polymers, alginate-derived polymers, vinyl-derived polymers, polyoxyethylene-derived polymers, polyoxyethylene-polyoxypropylene copolymer polymers, acrylic polymers, and inorganic water-soluble polymers.

[0033] (D) Oily component The composition according to the present invention may include an oily component (hereinafter sometimes referred to as component (D)) in addition to the components described above. The composition according to the present invention includes component (B) as a component constituting the oil phase, but component (D) may be added as needed.

[0034] Component (D) can be selected from those commonly used in cleansers and cosmetics, but it is preferable that it be selected from the group consisting of higher fatty acids, ester oils, higher aliphatic alcohols, hydrocarbon oils, and silicone oils.

[0035] Examples of higher fatty acids include myristic acid, lauric acid, palmitic acid, stearic acid, and behenic acid. Examples of ester oils include cetyl ethylhexanoate, octyl palmitate, ethylhexyl palmitate, ethylhexyl ethylhexanoate, isononyl isononanoate, ethylhexyl isononanoate, isodecyl neopentanoate, isocetyl octanoate, cetyl octanoate, hexyl laurate, isopropyl myristate, octyl palmitate, isocetyl stearate, isopropyl isostearate, octyl isopalmitate, isodecyl isostearate, 2-ethylhexyl succinate, and diethyl sebacate. Examples of higher fatty alcohols include cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, and cetostearyl alcohol. Examples of hydrocarbon oils include hydrogenated polyisobutene, isododecane, isohexadecane, squalane, paraffin, and isoparaffin. Examples of silicone oils include linear silicone oils such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, and cyclic silicone oils such as cyclopentasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0036] Of these, component (D) preferably contains a higher fatty acid, with isostearic acid, myristic acid, and lauric acid being particularly preferred.

[0037] If the composition according to the present invention contains component (D), its content is preferably greater than 0% by mass and 10% by mass or less, and more preferably 3 to 9% by mass, based on the total mass of the composition.

[0038] The compositions according to the present invention may contain various additional components in addition to the components described above, depending on the purpose. Such additional components may include amino acids, conditioning agents, thickeners, pH adjusters, neutralizing agents, animal and plant extracts, vitamins, pigments, fragrances, preservatives, UV absorbers, chelating agents, reducing agents, etc., one or more of which may be appropriately blended as long as they do not impair the effects of the present invention.

[0039] The composition according to the present invention has a bicontinuous structure, but the appearance of the composition is preferably transparent and single-phase. This appearance is due to the fact that both the aqueous and oily components in the composition exist uniformly in a fine state, each forming continuous layers.

[0040] A bicontinuous structure is one in which the aqueous phase and the oil phase each have continuous and random phases. The aqueous phase is composed of component (C) described above, and the oil phase is composed of component (B) described above, and component (D) if present.

[0041] The composition according to the present invention can be widely used in applications applied to the skin, such as cleansers and cosmetics. However, because it has a bicontinuous structure, it readily incorporates oily contaminants such as cosmetics into the oil phase, and also readily blends with water-based contaminants, thus achieving excellent results when used in cleansers, especially makeup removers. [Examples]

[0042] 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 content is expressed as mass % of the total amount.

[0043] [Examples 1-5, Comparative Examples 1-2] The compositions for each example were prepared using the formulations shown in Table 1.

[0044] Furthermore, the performance of these cosmetics was evaluated as follows.

[0045] [Formation of the bicon phase] The presence of a stable bicontinuous structure in the composition was evaluated by visual observation. The evaluation criteria were as follows: A: It was transparent and had a bicontinuous structure. E: Separation was observed and a bicontinuous structure could not be confirmed.

[0046] [Foam quality] Approximately 0.1g of the prepared composition was applied to the forearm, spread by moving the hand back and forth once in about 1 second, and then the foam quality was visually inspected. The evaluation criteria were a 5-point scale from A (excellent) to E (poor).

[0047] [Table 1] In Comparative Examples 1 and 2, no Bicon phase was formed in the composition, nor did foaming occur.

[0048] [Examples 6-10] The compositions for each example were prepared using the formulations shown in Table 2 and evaluated as follows.

[0049] [Formation of the bicon phase] The evaluation was performed using the same method as in Example 1.

[0050] [Makeup remover review] The makeup removal performance was evaluated using the following method. First, a sheet of artificial leather was prepared, and its surface reflectance was measured. Next, Modern Matte Powder Lipstick (product name, manufactured by Shiseido Co., Ltd.) was applied to the surface of the artificial leather sheet, and its surface reflectance was measured. Then, each sample was applied to the surface of the artificial leather sheet, foamed, washed with water, dried, and its surface reflectance was measured. At this time, the cleaning rate was calculated using the following formula (1). The reflectance was measured using a spectrophotometer CM-5 (manufactured by Konica Minolta, Inc.). D = (CB) / (AB) × 100 (1) D: Cleaning rate (%) A: Reflectance of the raw artificial leather sheet before makeup application B: Reflectance of artificial leather seat after makeup application C: Reflectance of artificial leather seat after washing

[0051] [Table 2] Furthermore, the cleaning efficiency of each of these samples was equivalent to or better than that of the existing products Elixir Reflet Balancing Bubble (manufactured by Shiseido Co., Ltd.) and Perfect Liquid n (manufactured by Shiseido Co., Ltd.).

[0052] [Examples 11-13] The compositions for each example were prepared using the formulations shown in Table 3 and evaluated in the same manner as described above. [Table 3]

[0053] [Examples 14-15] The compositions for each example were prepared using the formulations shown in Table 4 and evaluated in the same manner as described above. [Table 4] It was confirmed that a bicontinuous structure can be formed using only component (B) as the oil component, without component (D). [Examples 14-15] The compositions for each example were prepared using the formulations shown in Table 5 and evaluated in the same manner as described above. In this example, as component (A), two nonionic surfactants with HLB values ​​of 8 or 15 were combined and adjusted to have an average HLB of 10. The evaluation was performed in the same manner as described above. [Table 5]

Claims

1. (A) Nonionic surfactants with an average HLB of 9 to 14, (B) Oily foaming agent, and (C) aqueous component, It comprises a bicontinuous microemulsion phase comprising, A topical skin composition comprising component (B), wherein the boiling point of component (B) at 1 atmosphere is 22 to 36.5°C.

2. The composition according to claim 1, wherein component (B) is isopentane.

3. The composition according to claim 1 or 2, wherein component (A) is selected from the group consisting of polyoxyethylene hydrogenated castor oil and polyoxyethylene glycerin fatty acid esters.

4. The composition according to any one of claims 1 to 2, wherein the content of component (A) is 1 to 50% by mass based on the total mass of the composition.

5. The composition according to claim 1 or 2, wherein component (A) comprises a nonionic surfactant having an HLB of 9 to 14.

6. The composition according to claim 1 or 2, wherein the content of component (B) is greater than 0% by mass and 15% by mass or less, based on the total mass of the composition.

7. (D) The composition according to claim 1 or 2, further comprising an oily component selected from the group consisting of higher fatty acids, ester oils, higher aliphatic alcohols, hydrocarbon oils, and silicone oils.

8. The composition according to claim 7, wherein component (D) contains a higher fatty acid.

9. The composition according to claim 8, wherein the content of the higher fatty acid is greater than 0% by mass and 10% by mass or less, based on the total mass of the composition.

10. The composition according to claim 1 or 2, wherein component (C) comprises (c0) water. The composition described above.

11. The composition according to claim 1 or 2, wherein component (C) comprises (c1) an ionic surfactant.

12. The composition according to claim 1 or 2, wherein component (C) comprises (c2) a sulfur-containing amino acid compound.

13. The composition according to claim 1 or 2, which is transparent and has one phase.

14. A composition according to claim 1 or 2, which is a cleaning agent.

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