Oil-in-water type emulsion cosmetic with white turbidity

Abstract

To provide a novel oil-in-water type emulsion cosmetic which has a small emulsion droplet particle diameter while containing an oil component and has excellent stability in which white turbidity is observed in the appearance.SOLUTION: There is provided an oil-in-water type emulsion cosmetic with white turbidity, which comprises a hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, the following component (A) and the following component (B), wherein the average particle diameter of emulsion droplets is 50 to 200 nm and the content of the following component (A) is 0.01 to 2 mass%: (A) at least one ester oil selected from the group consisting of (A1) an ester oil of a straight-chain fatty acid and a branched-chain higher alcohol and (A2) an ester oil of a branched-chain fatty acid and an alcohol and (B) an ethylene oxide condensation type polyoxyethylene polyoxypropylene alkyl ether having an average addition molar number of ethylene oxide of less than 30.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Various cosmetic preparations to be applied to the skin have been developed, and cosmetic preparations with various characteristics according to purposes have been reported.

[0003] For example, Patent Document 1 reports an oil-in-water emulsion opaque skin cosmetic that can provide, in a single agent, the refreshing and cool feeling required of a lotion and the moisturizing and softening effects required of an emulsion. Patent Document 1 reports that by mixing (A) an oily agent that is liquid at room temperature and has a viscosity of 100 mPa·s or less at 25°C, (B) a hydrogenated phospholipid, (C) one or more nonionic surfactants having an HLB of 9 to 16 and selected from nonionic surfactants having a sterol skeleton, an alkyl ether skeleton, or a sorbitan fatty acid ester skeleton, (D) 1,3-butylene glycol, and (E) water in an appropriate blend ratio, it is possible to obtain a milky oil-in-water emulsion skin cosmetic that provides the refreshing and cool feeling required of a lotion and the moisturizing and softening effects required of an emulsion in a single agent, and that has a low viscosity composition that produces a watery texture while also being highly stable, with an average emulsion droplet size of 100 to 500 nm.

[0004] Even today, when a wide variety of cosmetics have been developed, it is important to develop new cosmetics in order to meet consumer needs and provide cosmetics that are different from conventional ones. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-254404 Summary of the Invention [Problem to be solved by the invention]

[0006] The present inventors focused on providing a new cosmetic product that is cloudy while retaining the freshness of a lotion. The present disclosure aims to provide a new oil-in-water emulsion cosmetic product that contains oil but has small emulsion droplet sizes, excellent stability, and a cloudy appearance. [Means for solving the problem]

[0007] As a result of extensive research, the present inventors have found that when a cosmetic preparation was prepared using hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, and the following component (A) and component (B), with the content of the following component (A) being 2% by mass or less, it was possible to obtain a cosmetic preparation with emulsion droplets having a small particle size of 200 nm or less, excellent stability, and a cloudy appearance. The present invention was completed through further research based on this finding, and the present disclosure encompasses, for example, the following representative inventions. Item 1. An oil-in-water emulsion opaque cosmetic comprising hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, and the following component (A) and component (B), wherein the average particle size of the emulsion droplets is 50 to 200 nm and the content of the following component (A) is 0.01 to 2 mass %: (A) at least one ester oil selected from the group consisting of (A1) ester oils of linear fatty acids and branched higher alcohols and (A2) ester oils of branched fatty acids and alcohols; (B) An ethylene oxide condensed polyoxyethylene polyoxypropylene alkyl ether having an average number of moles of ethylene oxide added of less than 30. Item 2. The oil-in-water emulsion milky white cosmetic preparation according to Item 1, wherein the component (B) is an ether with a higher alcohol having 18 to 26 carbon atoms. Item 3. The oil-in-water emulsion opaque cosmetic according to Item 1 or 2, wherein component (B) is polyoxyethylene polyoxypropylene decyl tetradecyl ether. Item 4. The oil-in-water emulsion milky white cosmetic preparation according to any one of Items 1 to 3, wherein the component (B) is PPG-6-decyltetradeceth-20. Item 5. The oil-in-water emulsion milky white cosmetic according to any one of Items 1 to 4, wherein the content of component (B) in the cosmetic is 0.2% by mass or more. Item 6. The oil-in-water emulsion milky white cosmetic preparation according to any one of Items 1 to 5, wherein component (A1) is an ester oil of a linear fatty acid having 12 to 22 carbon atoms and a branched higher alcohol having 6 to 24 carbon atoms, and component (A2) is an ester oil of a branched fatty acid having 5 to 12 carbon atoms and a linear or branched alcohol having 5 to 22 carbon atoms. Item 7. The oil-in-water emulsion milky white cosmetic preparation according to any one of Items 1 to 6, wherein component (A) is at least one selected from the group consisting of octyldodecyl myristate, cetyl ethylhexanoate, pentaerythrityl tetraethylhexanoate, and isostearyl neopentanoate. Item 8. The oil-in-water emulsion milky white cosmetic preparation according to any one of Items 1 to 7, wherein the content of the component (A) in the cosmetic preparation is 0.5 to 1.5% by mass. Item 9. The oil-in-water emulsion milky white cosmetic according to any one of Items 1 to 8, further comprising (C) at least one paste oil selected from the group consisting of phytosterol fatty acid esters, cholesterol fatty acid esters, and dimer acid esters, wherein the total amount of component (A) and component (C) in the cosmetic is 0.02 to 2% by mass. Item 10. The oil-in-water emulsion milky white cosmetic preparation according to any one of Items 1 to 9, wherein the component (C) is a phytosterol fatty acid ester. Item 11. The oil-in-water emulsion milky white cosmetic according to Item 9 or 10, wherein component (C) is at least one selected from the group consisting of phytosteryl isostearate, phytosteryl macadamiate, and di(phytosteryl / octyldodecyl) lauroyl glutamate. Item 12. The oil-in-water emulsion milky white cosmetic preparation according to any one of Items 9 to 11, wherein the component (C) is phytosteryl isostearate. Item 13. The oil-in-water emulsion milky white cosmetic according to any one of Items 1 to 10, wherein the viscosity of the cosmetic exceeds 300 mPa·s at 25°C. [Effects of the Invention]

[0008] It is possible to provide an oil-in-water emulsion cosmetic which contains oil but has small emulsion droplet size, is excellent in stability, and has a cloudy appearance. [Brief explanation of the drawings]

[0009] [Figure 1] 1 shows the appearance (stability, cloudiness) of the cosmetics prepared in Test Example 1 (Examples 1 to 4 and Comparative Examples 1 to 3) when stored at 25°C. [Figure 2] 1 shows the appearance of the cosmetics prepared in Test Example 1 (Examples 1 to 4 and Comparative Examples 1 to 3) when stored at 60°C. [Figure 3] 1 shows the appearance of the cosmetics prepared in Test Example 2 (Examples 1 and 5 and Comparative Examples 4 to 9) when stored at 25°C. [Figure 4] 1 shows the appearance of the cosmetics prepared in Test Example 2 (Examples 1 and 5 and Comparative Examples 4 to 9) when stored at 60°C. [Figure 5] 1 shows the appearance of the cosmetics prepared in Test Example 3 (Examples 6 and 7). DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments included in the present disclosure will be described in more detail. In the present disclosure, "comprise" also includes the meaning of "consist essentially of" or "consist of."

[0011] The present disclosure encompasses an oil-in-water emulsion cloudy cosmetic preparation containing hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, and the following components (A) and (B), wherein the average particle size of the emulsion droplets is 50 to 200 nm and the content of the following component (A) is 0.01 to 2 mass%. Hereinafter, this oil-in-water emulsion cloudy cosmetic preparation may be referred to as the "oil-in-water emulsion cloudy cosmetic preparation of the present disclosure." (A) at least one ester oil selected from the group consisting of (A1) ester oils of linear fatty acids and branched higher alcohols and (A2) ester oils of branched fatty acids and alcohols; (B) An ethylene oxide condensed polyoxyethylene polyoxypropylene alkyl ether having an average number of moles of ethylene oxide added of less than 30.

[0012] Hydrogenated phospholipids are also called hydrogenated lecithin. Hydrogenated phospholipids may be natural lecithin (e.g., soybean lecithin, egg yolk lecithin) hydrogenated according to a conventional method, or phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, or the like hydrogenated according to a conventional method. Preferred examples of hydrogenated phospholipids include hydrogenated soybean phospholipids and hydrogenated egg yolk phospholipids. Commercially available hydrogenated phospholipids include those under the trade name NIKKOL Lecinol S-10 (manufactured by Nikko Chemicals Co., Ltd.) and the trade name COATSOME® NC-21 (manufactured by NOF Corporation). Other examples include commercially available hydrogenated phospholipids contained under the trade names Phytocompo®-SP and Phytocompo-PP (both manufactured by Nippon Fine Chemical Co., Ltd.). One type of hydrogenated phospholipid may be used alone, or two or more types may be used in combination.

[0013] The content of hydrogenated phospholipid in the oil-in-water emulsion milky white cosmetic preparation of the present disclosure is not limited, but is preferably 0.05 to 0.5 mass %, more preferably 0.08 to 0.3 mass %, and even more preferably 0.1 to 0.2 mass %, for example.

[0014] Glycerin is a type of trihydric alcohol represented by the chemical formula C3H8O3. There are no limitations on the amount of glycerin contained in the oil-in-water emulsion opaque cosmetic preparation of the present disclosure, but examples of the amount include preferably 5 to 20 mass%, more preferably 6 to 15 mass%, and even more preferably 7 to 12 mass%, etc.

[0015] 1,3-butylene glycol (BG) is a type of dihydric alcohol. There are no limitations on the content of 1,3-butylene glycol in the oil-in-water emulsion cloudy cosmetic preparation of the present disclosure, but examples thereof include a content of preferably 2 to 20 mass%, more preferably 3 to 15 mass%, and even more preferably 4 to 10 mass%, etc.

[0016] Phytosterols are also called plant sterols, and examples thereof include β-sitosterol, campesterol, stigmasterol, brassicasterol, etc. Phytosterols are commercially available, and examples thereof include phytosterols contained in products under the trade names Phytocompo-SP and Phytocompo-PP (both manufactured by Nippon Fine Chemicals Co., Ltd.). Phytosterols may be used singly or in combination of two or more.

[0017] The content of phytosterol in the oil-in-water emulsion milky white cosmetic of the present disclosure is not limited, but is preferably 0.001 to 0.2 mass %, more preferably 0.005 to 0.1 mass %, and even more preferably 0.01 to 0.05 mass %, for example.

[0018] Furthermore, although not limiting the present disclosure, in the oil-in-water emulsion milky white cosmetic preparation of the present disclosure, the total amount of hydrogenated phospholipid, glycerin, 1,3-butylene glycol, and phytosterol is, for example, preferably 5 to 30% by mass, more preferably 7 to 25% by mass, and even more preferably 10 to 20% by mass.

[0019] Component (A) is at least one ester oil selected from the group consisting of the following components (A1) and (A2). (A1) Ester oil of straight chain fatty acid and branched chain higher alcohol (A2) Ester oil of branched chain fatty acid and alcohol

[0020] Component (A1) is not limited as long as it is an ester oil of a straight-chain fatty acid and a branched-chain higher alcohol, and preferred examples include an ester oil of a straight-chain fatty acid having 12 to 22 carbon atoms and a branched-chain higher alcohol having 6 to 24 carbon atoms.

[0021] More preferred examples of the carbon number of the straight-chain fatty acid constituting component (A1) include those having a carbon number of 14 to 18. The straight-chain fatty acid may be saturated or unsaturated, and in the case of an unsaturated fatty acid, the number of double bonds between carbon atoms is not limited, and examples of the number of double bonds include 1 to 4, preferably 1 to 3, and more preferably 1 or 2. Preferred examples of the straight-chain fatty acid include straight-chain saturated fatty acids.

[0022] The number of carbon atoms in the branched-chain higher alcohol constituting component (A1) is more preferably 8 to 20, for example. The branched-chain higher alcohol may be saturated or unsaturated, and in the case of an unsaturated branched-chain higher alcohol, the number of double bonds between carbon atoms is not limited, and the number of double bonds is, for example, 1 to 4, preferably 1 to 3, and more preferably 1 or 2. A preferred example of the branched-chain higher alcohol is a branched-chain saturated higher alcohol. The branched-chain higher alcohol may be any of primary, secondary, and tertiary alcohols, and a preferred example is a primary alcohol. The branched-chain higher alcohol may or may not have a cyclic structure, and preferably does not have a cyclic structure. A preferred example of the branched-chain higher alcohol is a branched-chain monohydric saturated higher alcohol.

[0023] Although not limiting the present disclosure, preferred examples of component (A1) include ester oils of linear saturated fatty acids having 14 to 18 carbon atoms and monovalent branched saturated higher alcohols having 8 to 20 carbon atoms. More preferred examples of component (A1) include octyldodecyl myristate and ethylhexyl palmitate. For example, octyldodecyl myristate can be described as an ester oil of linear saturated fatty acids having 14 carbon atoms (myristic acid) and branched monovalent saturated higher alcohols having 20 carbon atoms (octyldodecanol). Component (A1) may be used singly or in combination of two or more.

[0024] Component (A2) is not limited as long as it is an ester oil of a branched chain fatty acid and an alcohol, and preferred examples include an ester oil of a branched chain fatty acid having 5 to 12 carbon atoms and a linear or branched chain alcohol having 5 to 22 carbon atoms.

[0025] The number of carbon atoms in the branched chain fatty acid constituting component (A2) is more preferably 5 to 8. The branched chain fatty acid may be saturated or unsaturated, and in the case of an unsaturated fatty acid, the number of double bonds between carbon atoms is not limited, and the number of double bonds is, for example, 1 to 3, preferably 1 or 2. The branched chain fatty acid is preferably a branched saturated fatty acid.

[0026] The number of carbon atoms of the alcohol constituting component (A2) is more preferably 5 to 18, for example. The alcohol may be either linear or branched, and may or may not have a cyclic structure. Preferred examples include linear or branched alcohols without a cyclic structure. The alcohol may be saturated or unsaturated, and if unsaturated, the number of double bonds between carbon atoms is not limited, for example, 1 to 3, preferably 1 or 2. The alcohol may be any of primary, secondary, and tertiary alcohols, with primary alcohols being preferred. The alcohol may be a monohydric alcohol or a polyhydric alcohol (for example, a di-, tri-, tetra-, or pentahydric alcohol).

[0027] Although not limiting the present disclosure, preferred examples of component (A2) include ester oils of branched-chain saturated fatty acids having 5 to 8 carbon atoms and linear or branched-chain saturated alcohols having 5 to 18 carbon atoms. More preferred examples of component (A2) include cetyl ethylhexanoate, pentaerythrityl tetraethylhexanoate, and isostearyl neopentanoate. For example, cetyl ethylhexanoate can be explained as an ester oil of a branched-chain saturated fatty acid having 8 carbon atoms (2-ethylhexanoic acid) and a linear saturated alcohol having 16 carbon atoms (cetanol). For example, pentaerythrityl tetraethylhexanoate can be explained as an ester oil of four branched-chain saturated fatty acids having 8 carbon atoms and a branched-chain saturated alcohol having 5 carbon atoms (pentaerythritol). For example, isostearyl neopentanoate can be explained as an ester oil of a branched-chain saturated fatty acid having 5 carbon atoms (neopentanoic acid) and a branched-chain saturated alcohol having 18 carbon atoms (isostearyl alcohol). The component (A2) may be used alone or in combination of two or more.

[0028] Although not limiting the present disclosure, preferred examples of component (A) include octyldodecyl myristate, cetyl ethylhexanoate, pentaerythrityl tetraethylhexanoate, isostearyl neopentanoate, etc., more preferred examples include octyldodecyl myristate, cetyl ethylhexanoate, pentaerythrityl tetraethylhexanoate, etc., and even more preferred examples include octyldodecyl myristate, cetyl ethylhexanoate, etc. Component (A) may be used alone or in combination of two or more types.

[0029] In the oil-in-water emulsion milky white cosmetic preparation of the present disclosure, the total content of component (A) is, for example, 0.01 to 2 mass%, preferably 0.1 to 2 mass%, and more preferably 0.5 to 1.5 mass%.

[0030] Component (B) is an ethylene oxide condensed polyoxyethylene polyoxypropylene alkyl ether having an average number of ethylene oxide added of less than 30 moles.

[0031] In component (B), the average number of moles of ethylene oxide added is preferably 7 to 20, more preferably 12 to 20. In component (B), the average number of moles of propylene oxide added is preferably 2 to 8, more preferably 6 to 8. As component (B), preferably, the average number of moles of ethylene oxide added is 7 to 20 and the average number of moles of propylene oxide added is 2 to 8, more preferably, the average number of moles of ethylene oxide added is 12 to 20 and the average number of moles of propylene oxide added is 6 to 8. In component (B), the number of carbon atoms in the alkyl group is preferably 9 to 30, more preferably 16 to 30, and even more preferably 18 to 26. The alkyl group may be linear or branched.

[0032] Although component (B) is not limited to the present disclosure, preferred examples include polyoxyethylene polyoxypropylene alkyl ethers having 9 to 30 carbon atoms (average number of added moles of EO: 7 to 20, average number of added moles of PO: 2 to 8), more preferred examples include ethers of decyltetradecanol, cetanol, decanol, etc. with ethylene oxide and propylene oxide, such as polyoxyethylene polyoxypropylene decyl tetradecyl ether and polyoxyethylene polyoxypropylene cetyl ether, and even more preferred examples include polyoxyethylene polyoxypropylene decyl tetradecyl ether. Preferred examples of component (B) include PPG-6 decyltetradeceth-12, PPG-6 decyltetradeceth-20, PPG-2-deceth-5, PPG-2-deceth-7, PPG-2-deceth-10, PPG-2-deceth-12, PPG-4 ceteth-1, PPG-4 ceteth-10, PPG-4 ceteth-20, PPG-8 ceteth-1, PPG-8 ceteth-10, and PPG-8 ceteth-20, and more preferably PPG-6 decyltetradeceth-12 and PPG-6 decyltetradeceth-20. Component (B) may be used alone or in combination of two or more.

[0033] In the oil-in-water emulsion milky white cosmetic preparation of the present disclosure, the content of component (B) is not limited, but the total amount of component (B) is preferably 0.2 mass% or more, more preferably 0.2 to 3 mass%, and even more preferably 0.2 to 1 mass%, for example.

[0034] The oil-in-water emulsion cloudy cosmetic preparation of the present disclosure contains water. The amount of water contained in the oil-in-water emulsion cloudy cosmetic preparation of the present disclosure is not limited, but is preferably 50 to 85% by mass, more preferably 55 to 80% by mass, and even more preferably 60 to 75% by mass, for example.

[0035] Furthermore, the amount of water blended into the oil-in-water emulsion opaque cosmetic preparation of the present disclosure is not limited in this respect, but is preferably 2 to 8 parts by mass, more preferably 2.5 to 6 parts by mass, and even more preferably 3 to 5 parts by mass, of water per part by mass of the total content of hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, component (A), and component (B). Furthermore, when the oil-in-water emulsion opaque cosmetic preparation of the present disclosure contains component (C) described below, is preferably 2 to 8 parts by mass, more preferably 2.5 to 6 parts by mass, and even more preferably 3 to 5 parts by mass, of water per part by mass of the total content of hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, component (A), component (B), and component (C).

[0036] Although not limiting the present disclosure, the oil-in-water emulsion milky cosmetic of the present disclosure may further contain at least one paste oil (sometimes referred to as component (C)) selected from the group consisting of phytosterol fatty acid esters, cholesterol fatty acid esters, and dimer acid esters. In the present disclosure, the paste oil is an oily component that is semi-solid at room temperature (25°C).

[0037] Examples of phytosterol fatty acid esters include phytosteryl isostearate, phytosteryl oleate, phytosteryl macadamiate, di(phytosteryl / octyldodecyl) lauroyl glutamate, and di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate. Phytosterol fatty acid esters are commercially available, and examples include products under the trade names Plandool-ISS and Plandool-MAS (both manufactured by Nippon Fine Chemical Co., Ltd.), and product names Eldew (registered trademark) PS-203, PS-304, and PS-306 (all manufactured by Ajinomoto Co., Inc.). Phytosterol fatty acid esters may be used singly or in combination of two or more.

[0038] Examples of cholesterol fatty acid esters include cholesteryl isostearate, cholesteryl hydroxystearate, cholesteryl macadamia nut fatty acid, cholesteryl lanolin fatty acid, etc. Cholesterol fatty acid esters are commercially available, and examples include trade names Exepar IS-CE (manufactured by Kao Corporation), trade name Salacos HS (manufactured by Nisshin Oillio Group Co., Ltd.), trade names Ecolano MAC, Ecolano CLE-S (both manufactured by Nippon Fine Chemical Co., Ltd.), etc. Cholesterol fatty acid esters may be used alone or in combination of two or more.

[0039] Examples of dimer acid esters include dimer acid esters having a sterol skeleton, such as a phytosterol skeleton, such as dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl) and dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate. Commercially available dimer acid esters include those under the trade names Plandool-S, Plandool-H, and Plandool-G (all manufactured by Nippon Fine Chemicals Co., Ltd.). One type of dimer acid ester may be used alone, or two or more types may be used in combination.

[0040] Preferred examples of component (C) include phytosterol fatty acid esters. More preferred examples of component (C) include phytosteryl isostearate, phytosteryl macadamia nut fatty acid, and di(phytosteryl / octyldodecyl) lauroyl glutamate. Component (C) may be used singly or in combination of two or more.

[0041] When the oil-in-water emulsion cloudy cosmetic preparation of the present disclosure contains component (C), the content of component (C) in the cosmetic preparation is not limited, but is preferably 0.01 to 1.5% by mass, more preferably 0.05 to 1% by mass, and even more preferably 0.1 to 1% by mass, etc. Furthermore, when the oil-in-water emulsion cloudy cosmetic preparation of the present disclosure contains component (C), the total content of components (A) and (C) in the cosmetic preparation is preferably 0.02 to 2% by mass, more preferably 0.1 to 2% by mass, and even more preferably 0.5 to 1.5% by mass.

[0042] The oil-in-water emulsion milky cosmetic preparation of the present disclosure can be produced by uniformly mixing an oil phase (heated, for example, to about 50 to 80°C) containing hydrogenated phospholipids, glycerin, 1,3-butylene glycol, phytosterol, component (A), and component (B) with an aqueous phase (heated, for example, to about 50 to 80°C), followed by cooling (for example, to about 10 to 35°C). A preferred example of the cosmetic preparation is one in which 1,3-butylene glycol is added to the oil phase before the oil phase and the aqueous phase are mixed. A more preferred example of the cosmetic preparation is one in which 1,3-butylene glycol is not added to the water (aqueous phase), but is added to the oil phase before the oil phase and the water (aqueous phase) are mixed. Water may be mixed with the oil phase in two batches, or may be mixed with the oil phase in three or more batches. This allows the production of an oil-in-water emulsion milky cosmetic with an average emulsion droplet size of 50 to 200 nm and excellent stability. When the cosmetic contains component (C), it is preferable that component (C) is mixed with the oil phase before mixing the oil phase with water (aqueous phase). Furthermore, the cosmetic may contain any other components described below as necessary, and these other components can be mixed with the oil phase and / or water (aqueous phase) depending on their properties, to the extent that the effects of the present disclosure are not impaired.

[0043] Although not limiting the present disclosure, from the viewpoint of more easily producing the oil-in-water emulsion milky white cosmetic of the present disclosure, a preferred example is to produce the cosmetic according to the following procedure.

[0044] Hydrogenated phospholipid, glycerin, 1,3-butylene glycol, and phytosterol are mixed at about 50 to 80°C and stirred uniformly to obtain a mixture (oil phase 1). Separately, components (A) and (B) are mixed at about 50 to 80°C and stirred uniformly to obtain a mixture (oil phase 2). When the oil-in-water milky emulsion cosmetic preparation of the present disclosure contains component (C), component (C) is mixed with components (A) and (B) and stirred uniformly to obtain a mixture (oil phase 2). Oil phase 1 and oil phase 2 are mixed and stirred uniformly while maintaining the temperature at about 50 to 80°C to obtain a mixture (oil phase 3). Separately, water is heated to about 50 to 80°C, mixed with oil phase 3, and stirred until uniform while maintaining the temperature at about 50 to 80°C to obtain a mixture. When the water (aqueous phase) and oil phase 3 are mixed, the water (aqueous phase) does not already contain 1,3-butylene glycol. The entire amount of water to be incorporated into the cosmetic may be mixed with the oil phase 3 in one go, or may be mixed in two or more batches. While not limiting the scope of the present disclosure, water may be preferably mixed in two, three, or four batches. For example, in a case where water is mixed in two batches, a portion of the water (first batch) is mixed with the oil phase 3 and stirred until homogenous while maintaining a temperature of about 50 to 80°C, and the resulting mixture is then mixed with the remaining amount of water (second batch) and stirred until homogenous while maintaining a temperature of about 50 to 80°C. When water is mixed in two or more batches, the amount of water to be mixed in each batch is not limited and may be determined appropriately. When water is mixed in two or more batches, the amount of water to be mixed in the first batch is preferably 0.1 to 2 parts by mass, more preferably 1 to 1.5 parts by mass, per 1 part by mass of the total amount of the oil phase 3. The remaining water may be mixed with the mixture in one or more batches. When the oil-in-water emulsion cloudy cosmetic preparation of the present disclosure further contains other components described below, the other components may be mixed with the oil phase and / or water, or with the mixture obtained after mixing the oil phase and water, depending on their properties, to the extent that the effects of the present disclosure are not impaired. The oil-in-water emulsion cloudy cosmetic preparation of the present disclosure can be produced by cooling (to about 10 to 35°C) the mixture of the oil phase, water, and other components thus obtained, which are blended as necessary.

[0045] For this reason, a preferred example of a method for producing the oil-in-water emulsion milky white cosmetic preparation of the present disclosure is a method comprising the following steps: A step of mixing an oil phase at 50 to 80°C containing hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, component (A) and component (B) with an aqueous phase at 50 to 80°C that contains water but does not contain 1,3-butylene glycol, and stirring the mixture while maintaining the temperature at 50 to 80°C.

[0046] Furthermore, when the cosmetic contains the component (C), a preferred example of a method for producing the oil-in-water emulsion milky white cosmetic of the present disclosure includes the following steps: Mixing an oil phase at 50 to 80°C containing hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, component (A), component (B), and component (C) with an aqueous phase at 50 to 80°C that does not contain 1,3-butylene glycol but contains water, and stirring the mixture while maintaining the temperature at 50 to 80°C.

[0047] The oil-in-water emulsion milky cosmetic composition of the present disclosure may further contain, in addition to the aforementioned components, any other components that can be incorporated into conventionally known lotions or emulsions, provided that the effects of the present disclosure are not impaired. Examples of such other components include thickeners, fragrances, colorants, refreshing agents, preservatives, humectants, chelating agents, pearlizing agents, isotonicity agents, alcohols such as lower alcohols (having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms) and higher alcohols, surfactants (cationic surfactants, anionic surfactants, amphoteric surfactants, nonionic surfactants), oils (oils that are liquid at 25°C (e.g., ester oils, ether oils, hydrocarbon oils, animal and vegetable oils, silicone oils, etc.)), absorption enhancers, pH adjusters, UV absorbers, UV scattering agents, moisturizers, antibacterial agents, amino acids, vitamins, blood circulation-promoting components, anti-inflammatory components, animal and plant extracts, enzymes, moisturizing components, whitening components, nutritional components, and other functional components. The other components may be selected appropriately depending on the purpose, etc., as long as they do not interfere with the effects of the present disclosure. They may be used alone or in combination of two or more, and the amounts of the other components may be determined appropriately. In addition, the oil-in-water emulsion opaque cosmetic of the present disclosure is preferably produced without blending hydrocarbon oils, animal or vegetable oils, and / or silicone oils. The aforementioned components (hydrogenated phospholipids, glycerin, 1,3-butylene glycol, phytosterols, component (A), component (B), and component (C)) may also be known as oils, lower alcohols, nonionic surfactants, medicinal ingredients, etc., depending on the component, but the aforementioned components are not included in the other components.

[0048] In the oil-in-water emulsion white cloudy cosmetic preparation of the present disclosure, the average particle size of the emulsion droplets is 50 to 200 nm. More preferably, the average particle size is 70 to 150 nm, and even more preferably 80 to 130 nm. In the present disclosure, the average particle size of the emulsion droplets is measured at room temperature (25°C) using a zeta potential / particle size measuring system ELZS-1000ZS (manufactured by Otsuka Electronics Co., Ltd.) in accordance with the operating instructions, as shown in the Examples described below, by diluting the oil-in-water emulsion white cloudy cosmetic preparation of the present disclosure 30 times with purified water and using this as a measurement sample.

[0049] The oil-in-water emulsion opaque cosmetic preparation of the present disclosure is stable. In the present disclosure, stability is evaluated by filling 30 g of the cosmetic preparation into a transparent glass tube bottle, closing the lid, and storing it in a thermostatic bath at room temperature (25°C) or 60°C for one week, visually observing the appearance, and evaluating it according to the criteria in the examples described below ("◯: uniform appearance, no separation observed," "Δ: heterogeneous appearance, on the verge of separation," "×: completely separated").

[0050] The appearance of the oil-in-water emulsion opaque cosmetic of the present disclosure is milky white. In the present disclosure, opacity is evaluated by filling 30 g of the cosmetic into a transparent glass tube bottle, closing the lid, and storing the cosmetic at room temperature (25°C) or in a thermostatic bath at 60°C for one week, visually observing the appearance, and evaluating it according to the criteria in the examples described below ("Good: The entire appearance is uniformly opaque," "Average: The entire appearance is generally uniformly opaque," and "Poor: Not uniformly opaque").

[0051] In the oil-in-water emulsion milky cosmetic preparation of the present disclosure, the viscosity is not limited, but is preferably greater than 300 mPa·s at 25° C., more preferably greater than 300 mPa·s and not greater than 500 mPa·s, and even more preferably 330 to 400 mPa·s. The viscosity is measured using a BLOOKFIELD analog viscometer, LVT Model LVT115, using rotor No. 2 at a rotation speed of 12 rpm for a measurement time of 1 minute at 25° C.

[0052] The pH of the oil-in-water emulsion milky cosmetic preparation of the present disclosure is not limited as long as it is applicable to the skin, and is exemplified as a pH of 5.5 to 7, more preferably 5.5 to 6.5, at 25° C. The pH is measured at 25° C. using a tabletop pH meter F-72 (manufactured by Horiba, Ltd.).

[0053] The oil-in-water emulsion opaque cosmetic of the present disclosure can be applied to the skin. According to the present disclosure, an oil-in-water emulsion opaque cosmetic that is cloudy while retaining the freshness of a lotion can be provided. Therefore, the cosmetic can be used in various formulations, such as skin care products such as lotions, milky lotions, serums, and aftershave lotions, hair cosmetics such as hair tonics, hair care products, and hair styling products, and sunscreens. In particular, some cosmetics, such as lotions used for the purpose of supplying moisture and moisturizing ingredients after face washing, often have a transparent liquid appearance. According to the present disclosure, an oil-in-water cosmetic that has a cloudy appearance while retaining the freshness of a lotion can be provided, and therefore the cosmetic is useful as a new cloudy lotion or the like that replaces such transparent cosmetics.

[0054] The oil-in-water emulsion milky cosmetic composition of the present disclosure has the advantages of having small emulsion droplet sizes, milky white color, and excellent stability despite containing oil. The composition also has the advantage of being easily produced by simply mixing and stirring the ingredients without the need for shearing treatment using an emulsifying machine such as a high-pressure homomixer, disper mixer, ultra mixer, colloid mill, or homogenizer, thereby reducing the labor and cost involved. [Example]

[0055] Hereinafter, the embodiments of the present disclosure will be described more specifically with reference to examples, but the embodiments of the present disclosure are not limited to the following examples.

[0056] Test Example 1 1. Test Procedure Cosmetic preparation Cosmetics (Examples 1 to 4, Comparative Examples 1 to 3) were prepared by mixing the ingredients according to Table 1. In the table, the unit of component content is % by mass. Specifically, ingredients No. 1 to 3 shown in Table 1 were mixed, stirred, and heated to 70°C (oil phase 1). Separately, ingredients No. 4 to 6 were mixed, stirred, and heated to 70°C (oil phase 2). Oil phase 2 was added to oil phase 1 and stirred until homogenous while maintaining the temperature at 70°C (oil phase 3). Separately, ingredients No. 7 and 8 were added to ingredient No. 9 and heated to 80°C to dissolve the ingredients, and the resulting mixture was added to oil phase 3 and stirred until homogenous. After stirring, the mixture was cooled to room temperature (25°C) to prepare the cosmetics (Examples 1 to 4, Comparative Examples 1 to 3).

[0057] The cosmetics of Examples 1 to 4 and Comparative Examples 1 to 3 shown in Table 1 each contain different types of Component No. 6 (liquid oil at 25°C). Regarding Component No. 6 listed in Table 1, among Component (A), octyldodecyl myristate is an ester oil of a straight-chain fatty acid and a branched-chain higher alcohol (Component (A1)), while cetyl ethylhexanoate, pentaerythrityl tetraethylhexanoate, and isostearyl neopentanoate are ester oils of a branched-chain fatty acid and an alcohol (Component (A2)). Furthermore, among Component No. 6, squalane (hydrocarbon oil), macadamia seed oil (vegetable oil), and dimethicone (silicone oil) are liquid oils, but none of them fall under Component (A).

[0058] Phytocompo-SP (manufactured by Nippon Fine Chemicals Co., Ltd.) used in this test example is a commercially available product in which hydrogenated soybean phospholipids and phytosterols are dispersed in glycerin and BG. The ingredients in the table are as follows: Phytocompo-SP and Plandool-ISS: both Nippon Fine Chemicals Co., Ltd.; NIKKOL SG-DTD620 and NIKKOL SG-CIO: both Nikko Chemicals Co., Ltd.; Koyo ODM: Koyo Fine Chemical Co., Ltd.; Fine-Neo 408: Nippon Fine Chemicals Co., Ltd.; Neolite 180P: Kokyu Alcohol Kogyo Co., Ltd.; CROPURE MACADAMIA: Croda Japan Co., Ltd.; SH 200C Fluid 20 cSt: Dow-Toray Industries, Inc.

[0059] Average particle size of emulsion droplets Immediately after preparation, each cosmetic was diluted 30 times with purified water, and this was used as the measurement sample. The average particle size of the emulsion droplets was measured at 25°C using a zeta potential / particle size measurement system ELZS-1000ZS (manufactured by Otsuka Electronics Co., Ltd.) according to the operating instructions. Note that a total of 100g of each cosmetic was used for the measurement, which had been prepared by stirring with a stirrer. The same applies below.

[0060] ·Stability 30 g of each cosmetic was filled into a transparent glass tube bottle, the bottle was capped, and the bottle was left to stand for one week in a thermostatic chamber at room temperature (25° C.) or 60° C. After storage, the appearance was visually observed for any changes and evaluated according to the following criteria. ○: The appearance is uniform and no separation is observed △: The appearance is uneven and it is on the verge of separation. ×: Completely separated

[0061] Cloudy In the same manner as in the above-mentioned stability test, 30 g of each cosmetic was filled into a container, the container was capped, and the container was left to stand for one week in a thermostatic bath at room temperature or 60°C, after which the appearance of the container was visually inspected for cloudiness. ○: The entire appearance is uniformly cloudy △: The entire appearance is uniformly cloudy (same or more uniformly cloudy as in Example 7 of Test Example 3 (storage at 60°C) described later) ×: Not uniformly cloudy (inferior to Example 7 (storage at 60°C))

[0062] 2.Results The results are shown in Table 1. Figure 1 shows the appearance of each cosmetic when stored at 25°C, and Figure 2 shows the appearance of each cosmetic when stored at 60°C.

[0063] [Table 1]

[0064] As mentioned above, the cosmetics of Examples 1 to 4 and Comparative Examples 1 to 3 shown in Table 1 each contain different types of Component No. 6 (liquid oil). As shown in Table 1, the cosmetics of Examples 1 to 4, which contained octyldodecyl myristate, cetyl ethylhexanoate, pentaerythrityl tetraethylhexanoate, or isostearyl neopentanoate (Component (A)) as the liquid oil, all had small average emulsion droplet sizes of 200 nm or less, and the stability evaluation results were ○ or △ (Figures 1 and 2). Furthermore, the cosmetics of Examples 1 to 4 were evaluated as ○ in terms of appearance turbidity, and had a uniformly turbid appearance throughout (Figures 1 and 2). Furthermore, of the cosmetics of Examples 1 to 4 in which turbidity was observed, the cosmetic of Example 2 had a bluish turbid appearance compared to the cosmetics of Examples 3 and 4, and the cosmetic of Example 1 had an even bluish turbid appearance compared to the cosmetic of Example 2. Thus, the desired oil-in-water emulsion turbid cosmetics were obtained in Examples 1 to 4. When the cosmetics of Examples 1 to 4 were applied to the skin of expert panelists (3 people), a fresh feeling similar to that felt when a clear lotion was applied to the skin was felt.

[0065] On the other hand, in the cosmetics of Comparative Examples 1 to 3, which contained squalane (hydrocarbon oil), macadamia seed oil (vegetable oil), or dimethicone (silicone oil) as the liquid oil (No. 6) shown in Table 1, the average particle size of the emulsified droplets exceeded 400 nm, the stability evaluation results were ×, and the cloudiness evaluation results were ×, and the desired oil-in-water emulsion cloudy cosmetic preparation was not obtained. These findings demonstrate that the desired oil-in-water emulsion cloudy cosmetic preparation can be obtained by incorporating the ester oil of component (A) as the liquid oil.

[0066] Test Example 2 1. Test Procedure Cosmetics (Examples 1 and 5 and Comparative Examples 4 to 9) were prepared by mixing the ingredients in the same manner as in Test Example 1 according to Table 2 below. More specifically, the ingredients were mixed in the same manner as in the cosmetics shown in Table 1, except that octyldodecyl myristate (ingredient (A)) used in Test Example 1 was used as No. 6 (liquid oil) and the ingredients shown in Table 2 were used as No. 5 (nonionic surfactant). In the table, the ingredients are as follows: NIKKOL SG-DTD630, NIKKOL Decaglyn 1-ISV, NIKKOL Decaglyn 2-ISV, NIKKOL HCO-10, NIKKOL HCO-20, NIKKOL HCO-60: all manufactured by Nikko Chemicals Co., Ltd.

[0067] The cosmetics of Examples 1 and 5 and Comparative Examples 4 to 9 shown in Table 2 each contain a different type of Component No. 5 (nonionic surfactant). Regarding Component No. 5 listed in Table 2, PPG-6 decyltetradeceth-20 (HLB 11) is an ethylene oxide condensed polyoxyethylene polyoxypropylene alkyl ether (Component (B)) in which the average number of moles of ethylene oxide added is less than 30. Meanwhile, among Component No. 5, PPG-6 decyltetradeceth-30 (HLB 12), PEG-10 hydrogenated castor oil (HLB 6.5), PEG-20 hydrogenated castor oil (HLB 10.5), PEG-60 hydrogenated castor oil (HLB 14), polyglyceryl-10 isostearate (HLB 12), and polyglyceryl-10 diisostearate (HLB 10) are all nonionic surfactants but do not qualify as Component (B).

[0068] The average particle size, stability and turbidity of the emulsified droplets were measured and evaluated in the same manner as in Test Example 1.

[0069] 2.Results The results are shown in Table 2. Figure 3 shows the appearance of each cosmetic when stored at 25°C, and Figure 4 shows the appearance of each cosmetic when stored at 60°C.

[0070] [Table 2]

[0071] As shown in Table 2, the cosmetics of Examples 1 and 5, which contained PPG-6-decyltetradeceth-20 (ingredient (B)) as a nonionic surfactant, both had small average particle sizes of emulsified droplets of 200 nm or less, and the stability evaluation results were rated as either Good or Fair. Furthermore, the cosmetics of Examples 1 and 5 also had a cloudiness evaluation result of Good. Thus, the desired oil-in-water emulsion cloudy cosmetics were obtained in Examples 1 and 5. Furthermore, when the cosmetics of Examples 1 and 5 were applied to the skin of expert panelists in the same manner as in Test Example 1, a fresh feeling similar to that of a clear lotion was felt.

[0072] On the other hand, in the cosmetics of Comparative Examples 4 to 9, which contained nonionic surfactants not belonging to component (B), such as PPG-6 decyltetradeceth-30, PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-60 hydrogenated castor oil, polyglyceryl-10 isostearate, or polyglyceryl-10 diisostearate, the average particle size of the emulsified droplets exceeded 400 nm, the stability and cloudiness evaluation results were poor, and a separate phase was observed in the upper layer in all cases, and the desired oil-in-water emulsion cloudy cosmetic was not obtained. These findings demonstrate that the desired oil-in-water emulsion cloudy cosmetic can be obtained by incorporating component (B) as a nonionic surfactant.

[0073] Test Example 3 1. Test Procedure Cosmetics (Examples 1, 6, and 7) were prepared by mixing the ingredients in accordance with Table 3 in the same manner as in Test Example 1. Specifically, the ingredients were mixed in the same manner as in the cosmetics shown in Table 1, except that phytosteryl isostearate, phytosteryl macadamiate, or di(phytosteryl / octyldodecyl lauroyl glutamate) was used as No. 4 (component (C)) and octyldodecyl myristate (component (A)) was used as No. 6 (liquid oil) in accordance with Table 3. The ingredients in the table are as follows: Plandool-MAS: Nippon Fine Chemical Co., Ltd.; Eldew PS-203: Ajinomoto Co., Inc.

[0074] The average particle size, stability and turbidity of the emulsified droplets were also measured and evaluated in the same manner as in Test Example 1.

[0075] 2.Results The results are shown in Table 3. Figure 5 shows the appearance of the cosmetics of Examples 6 and 7 (stored at 25°C or 60°C).

[0076] [Table 3]

[0077] The cosmetics of Examples 1, 6, and 7 shown in Table 3 all had small emulsified droplet average particle sizes of 200 nm or less, and the stability evaluation results were ○ or △, and the cloudiness evaluation results were ○ or △. Thus, the desired oil-in-water emulsion cloudy cosmetics were obtained in all of Examples 1, 6, and 7. Furthermore, when the cosmetics of Examples 1, 6, and 7 were applied to the skin of expert panelists in the same manner as in Test Example 1, a fresh feeling similar to that of a clear lotion was felt.

[0078] Prescription example An example of an oil-in-water emulsion opaque cosmetic preparation according to the present disclosure is shown in Table 4. The numerical values ​​for each component listed in Table 4 indicate mass %. The viscosity of the cosmetic preparation shown in Table 4 exceeds 300 mPa·s.

[0079] [Table 4]

Claims

1. An oil-in-water emulsion milky white cosmetic comprising hydrogenated phospholipid, glycerin, 1,3-butylene glycol, phytosterol, and the following component (A) and component (B), wherein the average particle size of the emulsion droplets is 50 to 200 nm, and the content of the following component (A) is 0.01 to 2 mass %: (A) at least one ester oil selected from the group consisting of (A1) ester oils of linear fatty acids and branched higher alcohols and (A2) ester oils of branched fatty acids and alcohols; (B) An ethylene oxide condensed polyoxyethylene polyoxypropylene alkyl ether having an average number of moles of ethylene oxide added of less than 30.

2. 2. The oil-in-water emulsion milky white cosmetic preparation according to claim 1, wherein the component (B) is an ether with a higher alcohol having 18 to 26 carbon atoms.

3. 2. The oil-in-water emulsion milky cosmetic preparation according to claim 1, wherein the component (B) is polyoxyethylene polyoxypropylene decyl tetradecyl ether.

4. 2. The oil-in-water emulsion milky white cosmetic preparation according to claim 1, wherein the component (B) is PPG-6-decyltetradeceth-20.

5. 2. The oil-in-water emulsion milky cosmetic according to claim 1, wherein the content of the component (B) in the cosmetic is 0.2% by mass or more.

6. the component (A1) is an ester oil of a linear fatty acid having 12 to 22 carbon atoms and a branched higher alcohol having 6 to 24 carbon atoms, The component (A2) is an ester oil of a branched-chain fatty acid having 5 to 12 carbon atoms and a linear or branched-chain alcohol having 5 to 22 carbon atoms. The oil-in-water emulsion milky white cosmetic preparation according to claim 1.

7. 2. The oil-in-water emulsion milky cosmetic preparation according to claim 1, wherein the component (A) is at least one selected from the group consisting of octyldodecyl myristate, cetyl ethylhexanoate, pentaerythrityl tetraethylhexanoate, and isostearyl neopentanoate.

8. 2. The oil-in-water emulsion milky cosmetic according to claim 1, wherein the content of the component (A) in the cosmetic is 0.5 to 1.5% by mass.

9. The oil-in-water emulsion cloudy cosmetic according to claim 1, further comprising (C) at least one paste oil selected from the group consisting of phytosterol fatty acid esters, cholesterol fatty acid esters, and dimer acid esters, wherein the total amount of component (A) and component (C) in the cosmetic is 0.02 to 2% by mass.

10. 10. The oil-in-water emulsion milky white cosmetic according to claim 9, wherein the component (C) is at least one selected from the group consisting of phytosteryl isostearate, phytosteryl macadamiate fatty acid, and di(phytosteryl / octyldodecyl) lauroyl glutamate.

11. 2. The oil-in-water emulsion milky cosmetic according to claim 1, wherein the viscosity of the cosmetic exceeds 300 mPa·s at 25°C.

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