Water-in-oil emulsion composition

Abstract

Disclosed is a water-in-oil emulsion composition that maintains a good emulsified state and demonstrates good cosmetic stability. This water-in-oil emulsion composition contains (A) a metallic soap, (B) a coloring material, and (C) an ester wax. The content of component (C) is at least 25 mass% in terms of the total amount of wax in the composition.

Description

Water-in-oil emulsion composition REFERENCE TO RELATED APPLICATIONS

[0001] This patent application claims priority to an earlier filed Japanese patent application, Patent Application No. 2023-216274 (filing date: December 21, 2023), the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to a water-in-oil emulsion composition.

[0003] Because water-in-oil emulsion compositions have excellent water resistance, they are commonly used as sunscreen cosmetics, makeup cosmetics, makeup bases, etc. There are many different types of such water-in-oil emulsion compositions, and in recent years, due to growing global environmental awareness, research and development has been progressing on those that contain naturally derived ingredients and those that can be used as cosmetics that comply with the SDGs.

[0004] For example, Patent Document 1 discloses an oily solid cosmetic comprising (A) a solid oil agent containing (a1) sunflower seed wax and (a2) candelilla wax and not containing synthetic or mineral solid oil, and (B) a liquid oil agent containing (b) a liquid oil having an IOB value of 0.1 or more.

[0005] Furthermore, Patent Document 2 discloses a water-in-oil emulsion cosmetic containing (A) one or more emulsifiers selected from the group consisting of polyglyceryl-3 dimer dilinoleate diisostearate, polyglyceryl-4 (diisostearate / polyhydroxystearic acid / sebacic acid), and hydrogenated trilinoleate tri(polyglyceryl-3 / lauryl), (B) a liquid hydrocarbon oil, (C) an organically modified clay mineral, and (D) a hydrophobized metal oxide.

[0006] Thus, various water-in-oil emulsion compositions that can be used as environmentally friendly cosmetics have been found, but there is still a demand for water-in-oil emulsion compositions that are environmentally friendly and yet have excellent effects.

[0007] JP 2023-113367 A JP 2023-035935 A

[0008] The present invention provides a water-in-oil emulsion composition.

[0009] The present inventors have discovered that, in a typical water-in-oil emulsified solid base, if the colorant has poor dispersibility, the colorant may aggregate when the aqueous phase is added during base preparation, making it impossible to emulsify, while adding a dispersant that is compatible with the colorant to improve dispersibility increases the amount of residual oil, reducing oil resistance (makeup wear).However, a water-in-oil emulsion composition containing a metal soap, a colorant, and an ester wax can be emulsified without causing the colorant to aggregate when the aqueous phase is added, and also has excellent makeup wear.The present invention is based on this finding.

[0010] The present invention provides the following inventions. (1) A water-in-oil emulsion composition comprising (A) a metal soap, (B) a coloring material, and (C) an ester wax, wherein the amount of component (C) relative to the total amount of wax in the composition is 25 mass% or more. (2) The composition according to (1), further comprising (D) one or more components selected from the group consisting of linear polyoxyalkylene-modified silicones, branched polyoxyalkylene-modified silicones, and branched polyoxyalkylene-alkyl co-modified silicones. (3) The composition according to (2), wherein component (D) is one or more components selected from the group consisting of PEG-10 dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, and lauryl PEG-9 polydimethylsiloxyethyl dimethicone. (4) The composition according to any one of (1) to (3), further comprising one or more components selected from the group consisting of bisbutyl dimethicone polyglyceryl-3, isostearic acid, sorbitan sesquiisostearate, polyglyceryl-6 polyricinoleate, glyceryl isostearate, and cetyl PEG / PPG-10 / 1 dimethicone in an amount of 2.5% by mass or less relative to the total amount of the composition. (5) The composition according to any one of (1) to (4), wherein the component (A) is magnesium stearate. (6) The composition according to any one of (1) to (5), wherein the component (B) is an inorganic pigment. (7) The composition according to any one of (1) to (6), wherein the component (C) is a plant-derived wax. (8) The composition according to any one of (1) to (7), comprising the component (B) treated with the component (A).

[0011] According to the present invention, there is provided a water-in-oil emulsion composition that is in a good emulsified state and has excellent cosmetic staying power. Specific Description of the Invention

[0012] According to one aspect of the present invention, there is provided a water-in-oil emulsion composition comprising (A) a metal soap, (B) a coloring material, and (C) an ester wax, wherein the amount of component (C) in the water-in-oil emulsion composition is 25% by mass or more relative to the total amount of wax in the composition.

[0013] Component (A) in the water-in-oil emulsion composition of the present invention is a metal soap. There are no limitations on such metal soaps as long as they are generally used as raw materials for cosmetics and the like. Examples of such metal soaps include aluminum stearate, magnesium stearate, and zinc myristate, each of which has a residual hydroxyl group, and magnesium stearate is preferred.

[0014] Component (B) in the water-in-oil emulsion composition of the present invention is a colorant, and although there are no limitations on such colorant as long as it is one that is commonly used as a raw material for cosmetics, etc., it is preferably a pigment such as a natural colorant, an organic pigment, or an inorganic pigment, and more preferably an inorganic pigment. Examples of such inorganic pigments include titanium oxide, iron oxide (yellow iron oxide, black iron oxide, and red iron oxide), zinc oxide, cerium oxide, aluminum oxide, chromium oxide, chromium hydroxide, and the like, and more preferably red iron oxide, yellow iron oxide, black iron oxide, and titanium oxide.

[0015] The amount of component (B) in the water-in-oil emulsion composition of the present invention is preferably 5% by mass or more, more preferably 10% by mass or more, more preferably 20% by mass or more, more preferably 30% by mass or more, and more preferably 40% by mass or more, relative to the total amount of the composition.

[0016] The component (A) contained in the water-in-oil emulsion composition of the present invention also includes those derived from coloring materials treated with metal soaps.

[0017] According to a preferred embodiment of the present invention, the water-in-oil emulsion composition of the present invention comprises component (B) treated with component (A). That is, the water-in-oil emulsion composition of the present invention preferably contains a colorant treated with a metal soap as components (A) and (B).

[0018] The component (C) in the water-in-oil emulsion composition of the present invention is an ester wax. The term "ester wax" as used herein refers to a wax having at least one ester functional group. It is not limited to waxes commonly used as raw materials for cosmetics, etc., but examples include hydrogenated jojoba oil, hydrogenated palm oil, sunflower seed wax, candelilla wax, carnauba wax, beeswax, rice wax, Japan wax, rhododendron bark, jasmine wax, montan wax, and beeswax, with plant-derived wax being preferred. These waxes can be used alone or in combination as the component (C) in the water-in-oil emulsion composition of the present invention. According to a preferred embodiment of the present invention, the water-in-oil emulsion composition of the present invention comprises, as component (C), one or more waxes selected from the group consisting of sunflower seed wax, carnauba wax, and candelilla wax.

[0019] The water-in-oil emulsion composition of the present invention may contain a wax other than component (C). Such waxes are not limited as long as they are commonly used as raw materials for cosmetics, etc. Examples of such waxes include microcrystalline wax, paraffin wax, ozokerite, polyethylene wax, microwax, and mixtures thereof.

[0020] The amount of component (C) in the water-in-oil emulsion composition of the present invention is not particularly limited as long as the amount relative to the total amount of wax in the composition is 25% by mass or more, but is preferably 30% by mass or more, more preferably 40% by mass or more, more preferably 50% by mass or more, more preferably 60% by mass or more, and more preferably 100% by mass.

[0021] The water-in-oil emulsion composition of the present invention may further contain, as component (D), one or more components selected from the group consisting of linear polyoxyalkylene-modified silicones, branched polyoxyalkylene-modified silicones, and branched polyoxyalkylene-alkyl co-modified silicones.

[0022] The linear polyoxyalkylene-modified silicone of the present invention is not limited as long as it is one that is generally used as a raw material for cosmetics and the like, and examples thereof include PEG-11 methyl ether dimethicone, PEG-11 methyl ether dimethicone, PEG / PPG-20 / 22 butyl ether dimethicone, PEG-3 dimethicone, PEG-10 dimethicone, PEG-32 methyl ether dimethicone, and the like, with PEG-10 dimethicone being preferred.

[0023] The branched polyoxyalkylene-modified silicone of the present invention is not limited as long as it is one that is commonly used as a raw material for cosmetics and the like, but is preferably PEG-9 polydimethylsiloxyethyl dimethicone.

[0024] The branched polyoxyalkylene-alkyl-co-modified silicone of the present invention is not limited as long as it is one that is generally used as a raw material for cosmetics and the like, but is preferably lauryl PEG-9 polydimethylsiloxyethyl dimethicone.

[0025] According to one preferred embodiment of the present invention, the water-in-oil emulsion composition of the present invention comprises, as component (D), one or more components selected from the group consisting of PEG-10 dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, and lauryl PEG-9 polydimethylsiloxyethyl dimethicone.

[0026] The water-in-oil emulsion composition of the present invention may or may not further contain, as component (E), one or more components selected from the group consisting of bisbutyl dimethicone polyglyceryl-3, isostearic acid, sorbitan sesquiisostearate, polyglyceryl-6 polyricinoleate, glyceryl isostearate, and cetyl PEG / PPG-10 / 1 dimethicone in an amount of 2.5% by mass or less based on the total amount of the composition.

[0027] When the water-in-oil emulsion composition of the present invention contains component (E), according to one preferred embodiment of the present invention, the blending amount of component (E) in the water-in-oil emulsion composition of the present invention is 2.5% by mass or less, more preferably 2% by mass or less, and more preferably 0.5% by mass or less.

[0028] According to another preferred embodiment of the present invention, the water-in-oil emulsion composition of the present invention does not contain component (E).

[0029] The water-in-oil emulsion composition of the present invention may further contain an oil component. Such oil components are not particularly limited as long as they are generally used as raw materials for cosmetics, etc. Examples of such oil components include silicone oil, hydrocarbon oil, ester oil, higher alcohols having 12 to 22 carbon atoms, fatty acids having 12 to 22 carbon atoms, and fats and oils.

[0030] The water-in-oil emulsion composition of the present invention may further contain, as necessary, optional additive components that are typically incorporated into cosmetics, etc., within the scope of not impairing the effects of the present invention. Examples of such additive components include powders, coating agents, thickeners, drugs, sequestering agents, lower alcohols, polyhydric alcohols, antioxidants, preservatives, fragrances, etc.

[0031] The water-in-oil emulsion composition of the present invention may be liquid, semi-solid, or solid.

[0032] The water-in-oil emulsion composition of the present invention may be used as a cosmetic composition. The cosmetic composition in the present invention means a composition used for the purpose of applying makeup.

[0033] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Contents are expressed in mass % unless otherwise specified.

[0034] Compositions of the examples and comparative examples were prepared by conventional methods according to the formulations shown in Tables 1 to 7. In Tables 1 to 7, the blending ratio of each component is expressed in mass %.

[0035] The emulsion state and oil resistance (cosmetic wear) of the compositions prepared above were evaluated according to the following procedures.

[0036] Evaluation of Emulsified State The emulsified state of the prepared compositions of each Example and Comparative Example was evaluated visually according to the following evaluation criteria. <Evaluation criteria> A: No aggregation of coloring material, and emulsification successful. B: Almost no aggregation of coloring material, and emulsification successful. C: Aggregation of coloring material, and failure to emulsify, or significant color unevenness.

[0037] Evaluation of cosmetic staying power 5 mg of each composition of each Example and Comparative Example was applied to artificial leather and left to stand at 37°C for 5 minutes. Next, the applied area was tapped twice with a tapping tester onto filter paper coated with 0.25 mg of artificial sweat to transfer the cosmetic. The amount of each cosmetic transferred to the filter paper was visually evaluated according to the following criteria. <Evaluation criteria> A: No transfer to the filter paper was observed. B: Light transfer to the filter paper was observed. C: Heavy transfer to the filter paper was observed.

[0038] The results are shown in Tables 1 to 7.

[0039]

[0040]

[0041]

[0042]

[0043]

[0044]

[0045]

[0046] The results in Tables 1 to 7 show that the compositions of Examples 1 to 14 all had a good emulsified state and good makeup lasting power, while the compositions of Comparative Examples 1 to 6 all had poor emulsified states and / or poor makeup lasting power. These results demonstrate that the water-in-oil emulsion compositions of the present invention have the excellent effect of providing a good emulsified state and good makeup lasting power.

Claims

1. A water-in-oil emulsion composition comprising (A) a metal soap, (B) a coloring material, and (C) an ester wax, wherein the amount of component (C) relative to the total amount of wax in the composition is 25 mass% or more.

2. The composition according to claim 1, further comprising (D) one or more components selected from the group consisting of linear polyoxyalkylene-modified silicones, branched polyoxyalkylene-modified silicones, and branched polyoxyalkylene-alkyl co-modified silicones.

3. The composition according to claim 2, wherein said component (D) is one or more components selected from the group consisting of PEG-10 dimethicone, PEG-9 polydimethylsiloxyethyl dimethicone, and lauryl PEG-9 polydimethylsiloxyethyl dimethicone.

4. The composition according to claim 1, further comprising or not comprising one or more components selected from the group consisting of (E) bisbutyl dimethicone polyglyceryl-3, isostearic acid, sorbitan sesquiisostearate, polyglyceryl-6 polyricinoleate, glyceryl isostearate, and cetyl PEG / PPG-10 / 1 dimethicone in an amount of 2.5% by mass or less based on the total amount of the composition.

5. The composition according to claim 1, wherein said component (A) is magnesium stearate.

6. The composition according to claim 1, wherein component (B) is an inorganic pigment.

7. The composition according to claim 1, wherein component (C) is a wax derived from a plant.

8. The composition according to claim 1, comprising component (B) treated with component (A).

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