Oil-based emulsions in water

Abstract

To provide an oil-in-water type emulsion composition having good storage stability, rich and thick feeling during application and excellent skin elasticity and flexibility after application.SOLUTION: There is provided an oil-in-water type emulsion composition which comprises the following components (A) to (D): (A) a nonionic surfactant, (B) a glycerol monoalkyl ether, (C) (moringa oil / hydrogenated moringa oil) esters and (D) an oily component which is liquid at 25°C and has good storage stability, rich and thick feeling during application and excellent skin elasticity and flexibility after application.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion composition that has good storage stability, gives a rich and thick feel when applied, and leaves the skin with excellent firmness and softness after application. [Background technology]

[0002] Oil-in-water emulsion cosmetics, such as lotions and creams, are primarily used to replenish moisture and oil to the skin and moisturize it. However, to differentiate products and add high added value, it is essential that they have an appealing feel or texture on the skin during and after application. Consumers' preferred textures vary, but in recent years, there has been a trend toward a rich, thick feel that gives a luxurious feel upon application. On the other hand, many consumers expect skin to feel firm and supple after application, giving a youthful impression.

[0003] As a technique for imparting a rich, thick feel upon application, there is a technique of incorporating an acrylamide-based thickener and hydroxypropyl methylcellulose into an oil-in-water emulsion cosmetic that contains a higher fatty acid, a higher alcohol, and a surfactant, which are solid at room temperature (Patent Document 1), and a technique of incorporating an acrylamide-based thickener and hydroxypropyl methylcellulose into an oil-in-water emulsion cosmetic that has a kinematic viscosity of 30,000 to 100,000 mm at 25°C (Patent Document 1). 2 A technology containing dimethylpolysiloxane, a specific highly polar ester oil, a water-soluble acrylic polymer, and a nonionic surfactant (Patent Document 2) has been proposed. However, although the higher fatty acids and higher alcohols that are components of Patent Document 1 provide a rich feeling when applied, they may form a hard film on the skin after application, impairing skin flexibility, while the highly polar ester oil that is a component of Patent Document 2 is insufficient in terms of skin firmness and flexibility after application, and also causes stickiness when the content is high.

[0004] On the other hand, technologies that impart both firmness and softness to the skin after application include a technology that incorporates volatile hydrocarbons, higher alcohols that are liquid at 25°C, two oils with specific melting points, an oleic acid-based nonionic surfactant with an HLB value of 10 to 16, and water (Patent Document 3), a technology that incorporates phospholipids, liquid isoparaffin of a specific molecular weight, an oil that is liquid at 25°C, and water (Patent Document 4), a technology that incorporates an oily component including shea butter, a polyhydric alcohol with two hydroxyl groups in the molecule, a polyhydric alcohol with three or more hydroxyl groups in the molecule, phospholipids, carboxyvinyl polymers, and one or more water-soluble polymers selected from xanthan gum, and water (Patent Document 5), and a technology that incorporates N-acylamino acids or salts thereof, phytosteryl oleate, and an oil with a water-holding capacity of 150% or more of its own weight (Patent Document 6). All of these technologies effectively incorporate specific oils to achieve both firmness and softness, but no research has been conducted into the development of a rich, thick texture upon application. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-89741 [Patent Document 2] Patent Publication No. 2021-50163 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-214448 [Patent Document 4] Japanese Patent Application Laid-Open No. 2015-189697 [Patent Document 5] Japanese Patent Application Laid-Open No. 2016-44179 [Patent Document 6] Japanese Patent Application Publication No. 2019-147785 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention addresses the problem of providing an oil-in-water emulsion composition that has good storage stability, gives a rich and thick feeling when applied, and leaves the skin with excellent firmness and softness after application. [Means for solving the problem]

[0007] As a result of extensive research into the above-mentioned problems, the present inventors have found that the above-mentioned problems can be solved by an oil-in-water emulsion composition containing a nonionic surfactant, a glycerin monoalkyl ether, a (moringa oil / hydrogenated moringa oil) ester, and an oily component that is liquid at 25°C, and have thus completed the present invention.

[0008] That is, the present invention provides: (A) Nonionic surfactant (B) Glycerin monoalkyl ether (C) (Moringa oil / hydrogenated moringa oil) esters (D) Oily components that are liquid at 25°C The present invention provides an oil-in-water emulsion composition comprising:

[0009] The present invention also provides an oil-in-water emulsion composition, wherein component (A) is one or more members selected from polyoxyethylene phytosterols and / or polyoxyethylene phytostanols.

[0010] The present invention also provides an oil-in-water emulsion composition, wherein component (B) is glycerin monostearyl ether.

[0011] The present invention also provides an oil-in-water emulsion composition characterized by containing component (E) phytosteryl hydroxystearate. [Effects of the Invention]

[0012] The oil-in-water emulsion composition of the present invention has good storage stability, has a rich and thick feel when applied, and leaves the skin with excellent firmness and softness after application. BEST MODE FOR CARRYING OUT THE INVENTION

[0013] The nonionic surfactant of component (A) used in the present invention can be any nonionic surfactant commonly used in cosmetics, regardless of its origin (e.g., animal, plant, or petroleum-derived) and whether it is in solid, paste, or liquid form. Examples of nonionic surfactants include, but are not limited to, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene phytosterols, polyoxyethylene phytostanols, polyoxyethylene cholesterol, polyoxyethylene cholestanol, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, glycerin fatty acid esters, sorbitan fatty acid esters, polyglycerin fatty acid esters, sucrose fatty acid esters, alkyl polyglucosides, polyether-modified silicones, and polyglycerin-modified silicones. Furthermore, one or more of these surfactants can be used in combination. Among these, polyoxyethylene phytosterol and / or polyoxyethylene phytostanol are preferred, and polyoxyethylene phytosterol and / or polyoxyethylene phytostanol having an average number of added moles of polyoxyethylene chains of 10 to 30 are more preferred. Among these, polyoxyethylene (25) phytostanol is even more preferred. The number in parentheses after polyoxyethylene indicates the average number of added moles of oxyethylene chains. An example of a commercially available product is NIKKOL BPSH-25 (manufactured by Nikko Chemicals Co., Ltd.).

[0014] The content of component (A) used in the present invention is not particularly limited, but is preferably 0.5 to 3 wt % in the emulsion composition. Within this range, the emulsion composition has good storage stability, has a rich and thick feel upon application, and provides sufficient effects in terms of firmness and softness of the skin after application.

[0015] The glycerin monoalkyl ether of component (B) used in the present invention has a structure in which an alkyl chain having 16 to 18 carbon atoms is bonded to glycerin via an ether bond. Specific examples include glycerin monocetyl ether (chimyl alcohol), glycerin monostearyl ether (batyl alcohol), and glycerin monooleyl ether (selachyl alcohol). Of these, glycerin monostearyl ether is preferred, and an example of a commercially available product is Batyl Alcohol EX (manufactured by Nikko Chemicals Co., Ltd.).

[0016] The content of component (B) used in the present invention is not particularly limited, but is preferably 0.5 to 3 wt % in the emulsion composition. Within this range, the emulsion composition has good storage stability, has a rich and thick feel upon application, and provides sufficient effects in terms of firmness and softness of the skin after application.

[0017] The (moringa oil / hydrogenated moringa oil) ester of component (C) used in the present invention is an ester obtained by transesterification of Moringa oleifera seed oil and hydrogenated moringa oil, and is solid at 25° C. An example of a commercially available product is Floralipids Moringa Butter (manufactured by Floratech).

[0018] The content of component (C) used in the present invention is not particularly limited, but is preferably 0.5 to 8 wt %, more preferably 1 to 6 wt %, in the emulsion composition. Within this range, the emulsion composition has good storage stability, has a rich and thick feel upon application, and provides sufficient effects in terms of firmness and softness of the skin after application.

[0019] The oily component (D) used in the present invention that is liquid at 25°C is not particularly limited, but examples thereof include vegetable oils, hydrocarbon oils, ester oils, and silicone oils. Specific examples include mineral oil, squalane, hydrogenated polyisobutene, olefin oligomers, jojoba oil, olive oil, macadamia seed oil, meadowfoam oil, octyldodecyl myristate, isononyl isononanoate, isotridecyl isononanoate, isostearyl isostearate, trimethylolpropane triisostearate, neopentyl glycol dicaprate, caprylic / capric triglyceride, diisostearyl malate, dimethicone, diphenylsiloxyphenyl trimethicone, and cyclopentasiloxane. These components may be used alone or in combination.

[0020] The content of component (D) used in the present invention is not particularly limited, but is preferably 10 to 40 wt %, more preferably 15 to 35 wt %, in the emulsion composition. Within this range, the emulsion composition has good storage stability, has a rich and thick feel upon application, and provides sufficient effects in terms of firmness and softness of the skin after application.

[0021] Phytosteryl hydroxystearate, component (E) used in the present invention, is an ester that is solid at 25° C. An example of a commercially available product is “Salacos FH” (manufactured by Nisshin Oillio Group, Ltd.).

[0022] The content of component (E) used in the present invention is not particularly limited, but is preferably 0.5 to 8 wt %, more preferably 1 to 6 wt %, in the emulsion composition. Within this range, the emulsion composition has good storage stability, has a rich and thick feel upon application, and provides sufficient effects in terms of firmness and softness of the skin after application.

[0023] The oil-in-water emulsion composition of the present invention can further contain various ingredients depending on the intended use, such as UV absorbers, preservatives, antioxidants, whitening agents, vitamins, amino acids, hormones, peptides, physiologically active plant extracts, fluorescent materials, pigments, dyes, fragrances, scrubbing agents, binders, bulking agents, thickeners, sugars, nutritional components, chelating agents, disinfectants, keratin improving agents, keratolytic agents, antibiotics, skin permeation enhancers, blood circulation enhancers, anti-inflammatory agents, cell activators, anti-inflammatory agents, analgesics, skin softeners, skin emollients, wound healing agents, and metabolism enhancers, within limits that do not impair the effects of the present invention.

[0024] The oil-in-water emulsion composition of the present invention can be used as a beauty serum, emulsion, cream, pack, etc. The oil-in-water emulsion composition of the present invention may be in any form, such as emulsion, cream, or solid. [Example]

[0025] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. The contents are shown in % by weight.

[0026] Oil-in-water emulsion compositions having the formulations shown in Tables 1 to 4 below were prepared, and the storage stability and usability were evaluated.

[0027] (Storage stability evaluation method) The obtained oil-in-water emulsion composition was filled into a plastic container and stored for 6 months in a thermostatic bath at 40° C. The emulsion particles were observed under a microscope and evaluated according to the following criteria. ◎: No difference is observed from the initial state. ○: The emulsion particles are slightly larger, but the emulsion state is maintained. ×: Emulsified particles are clearly larger.

[0028] (Usage evaluation method) A use test was conducted by a female expert panel (20 people). The obtained oil-in-water emulsion composition was used and evaluated for "rich and thick feeling" upon application, and "skin firmness" and "skin flexibility" after application according to the following criteria. (1) Rich and full-bodied texture ◎: 18 or more people judged that it had a rich, full-bodied texture. ○: 14 to 17 people judged that it had a rich, thick texture. △: 9 to 13 people judged that it had a rich and thick texture. ×: Eight or fewer people judged that the product had a rich, thick texture. (2) Skin firmness ◎: 18 or more people judged that they felt their skin was firmer. ○: 14 to 17 people judged that they felt their skin was firm. △: 9 to 13 people judged that they felt their skin was firm. ×: Eight or fewer people judged that they felt their skin was firm. (3) Skin flexibility ◎: 18 or more people judged that they felt their skin became soft. ○: 14 to 17 people judged that they felt their skin became soft. △: 9 to 13 people judged that they felt skin softness. ×: Eight or fewer people judged that they felt their skin was soft.

[0029] (Production method in Table 1) Components 1 to 3 were mixed with a portion of components 12 and 13 at 80°C (part a). Components 4 to 11 were dissolved at 80°C and added to part a with stirring. Components 12 to 16 were uniformly mixed and heated to 80°C, then added and emulsified. The resulting mixture was cooled to 30°C to obtain an oil-in-water emulsion composition.

[0030] [Table 1]

[0031] As can be seen from the results in Table 1, the compositions of the present invention, Examples 1 to 7, achieved satisfactory results in all of the items evaluated. In particular, the compositions (Examples 1, 2, 5, and 6) that used polyoxyethylene (25) phytostanol as component (A) at a content of 0.5 to 3 wt % and glycerin monostearyl ether as component (B) at a content of 0.5 to 3 wt % achieved significantly superior results in all of the items evaluated. On the other hand, the composition that did not contain component (B) (Comparative Example 1) and the compositions that contained stearyl alcohol or stearic acid instead of component (B) (Comparative Examples 2 and 3) did not achieve satisfactory results.

[0032] (Production method in Table 2) Component 1 was mixed with a portion of components 11 and 12 at 80°C (part a). Components 2 to 10 were dissolved at 80°C and added to part a with stirring. Components 11 to 15 were uniformly mixed thereto and heated to 80°C, then added and emulsified. The mixture was cooled to 30°C to obtain an oil-in-water emulsion composition.

[0033] [Table 2]

[0034] As can be seen from the results in Table 2, the compositions of Examples 8 to 11 of the present invention achieved satisfactory results in all of the evaluated items. In particular, the compositions (Examples 9 and 10) containing 1 to 6 wt% of component (C) (moringa oil / hydrogenated moringa oil) esters achieved significantly superior results in all of the evaluated items. On the other hand, the composition not containing component (C) (Comparative Example 4) and the compositions containing shea butter, partially hydrogenated jojoba oil, beeswax, and moringa seed oil instead of component (C) (Comparative Examples 5 to 8) did not achieve satisfactory results.

[0035] (Production method in Table 3) Component 1 was mixed with a portion of components 8 and 9 at 80°C (part a). Components 2 to 7 were dissolved at 80°C and added to part a with stirring. Components 8 to 12 were uniformly mixed thereto and heated to 80°C, then added and emulsified. This was cooled to 30°C to obtain an oil-in-water emulsion composition.

[0036] [Table 3]

[0037] The results in Table 3 show that the compositions of the present invention, Examples 12 to 16, achieved satisfactory results in all of the evaluated items. In particular, the compositions (Examples 13, 14, and 16) containing 15 to 35 wt % of component (D), an oily component liquid at 25°C, achieved significantly superior results in all of the evaluated items. On the other hand, the composition not containing component (D) (Comparative Example 9) did not achieve satisfactory results.

[0038] (Production method in Table 4) Component 1 was mixed with a portion of components 9 and 10 at 80°C (part a). Components 2 to 8 were dissolved at 80°C and added to part a with stirring. Components 9 to 13 were uniformly mixed thereto and heated to 80°C, then added and emulsified. The resulting mixture was cooled to 30°C to obtain an oil-in-water emulsion composition.

[0039] [Table 4]

[0040] As can be seen from the results in Table 4, the compositions of the present invention, Examples 17 to 23, achieved satisfactory results in all of the evaluated items. In particular, the compositions containing 1 to 6 wt% of component (E) phytosteryl hydroxystearate (Examples 19 and 20) achieved significantly superior results in all of the evaluated items.

[0041] Other embodiments of the present invention will be described below.

[0042] Example 24 (Ingredients) (Weight%) 1. Polyoxyethylene (25) Phytostanol 1.5 2. Hydrogenated soybean phospholipids*20 0.2 3. Hydrogenated soy lysophospholipid*21 0.2 4. Behenyl Alcohol 1.0 5. Ceramide NG 0.1 6. Glycerin Monostearyl Ether 1.0 7. (Moringa Oil / Hydrogenated Moringa Oil) Esters 3.0 8. Squalane 15.0 9. Trimethylolpropane triisostearate 10.0 10. Phytosteryl Hydroxystearate 4.0 11. Beeswax 0.5 12. Ubiquinone 0.01 13.Purified water remainder 14. 1,3-butylene glycol 12.0 15. Xanthan gum 0.1 16. Sodium hyaluronate 0.1 17. (Acrylates / C10-30 alkyl acrylate) crosspolymer 0.3 18. Phenoxyethanol 1.0 19. 2-amino-2-methyl-1,3-propanediol 0.3 20.Fragrance 0.1 (Manufacturing method) Components 1 to 3 were mixed with a portion of components 13 and 14 at 80°C (part a). Components 4 to 12 were dissolved at 80°C and added to part a with stirring. Components 13 to 19 were uniformly mixed thereto and heated to 80°C, then added and emulsified. The mixture was then cooled with stirring, and component 20 was added at 70°C. Cooling was stopped at 30°C to obtain an oil-in-water emulsion composition.

[0043] Example 25 (Ingredients) (Weight%) 1. Sucrose stearate *22 2.0 2. Glycerin 6.0 3. Glycerin Monostearyl Ether 1.0 4. (Moringa Oil / Hydrogenated Moringa Oil) Esters 5.0 5. Isotridecyl isononanoate *23 5.0 6. Squalane 10.0 7. Macadamia seed oil 10.0 8. Phytosteryl Hydroxystearate 2.0 9. Glyceryl / Polyglyceryl-6 Isostearate / Behenate Esters *24 2.0 10.Purified water remainder 11. Carbomer 0.2 12. 1,3-butylene glycol 10.0 13. Pentylene Glycol 2.0 14. 2-Amino-2-methyl-1,3-propanediol 0.2 15.Fragrance 0.1 16. Succinoyl Atelocollagen Solution *25 2.0 17. Water-soluble collagen liquid *26 2.0 (Manufacturing method) Components 1 and 2 were thoroughly mixed, and then components 3 to 9 dissolved at 80°C were added with stirring. Components 10 to 14 were then uniformly mixed and heated to 80°C, after which they were added to components 1 to 9 and emulsified. The mixture was then cooled with stirring, and component 15 was added at 70°C, followed by components 16 and 17 at 50°C. Cooling was then stopped at 30°C to obtain an oil-in-water emulsion composition.

[0044] Both Examples 24 and 25 were excellent in storage stability, and satisfactory results were obtained in all evaluation items for the feeling of use.

[0045] *1: NIKKOL BPSH-25: Manufactured by Nikko Chemicals *2: NIKKOL BPS-30: Manufactured by Nikko Chemicals *3: NIKKOL BPS-10: Manufactured by Nikko Chemicals Co., Ltd. *4: Batyl alcohol EX: manufactured by Nikko Chemicals *5: Chimyl alcohol 100: Manufactured by Nikko Chemicals *6: Floralipids Moringa Butter: Manufactured by Floratech *7: ODM: Kokyu Alcohol Kogyo Co., Ltd. *8: SQUALANE: Manufactured by Kishimoto Co., Ltd. *9: Salakos FH: Manufactured by Nisshin Oillio Group *10: Shea butter RF: manufactured by Kokyu Alcohol Kogyo Co., Ltd. *11:Floraesters 30:Manufactured by Floratech *12: SR Beeswax-PA-(JP): Manufactured by Croda Japan *13: Floralipids Moringa Oil-Refined: Manufactured by Floratech *14: Croda Pure Medform-LQ-(JP): Manufactured by Croda Japan *15: KAK TTI: Manufactured by Kokyu Alcohol Kogyo Co., Ltd. *16: Croda Pure Macadamia-LQ-(JP): Manufactured by Croda Japan *17: Pearleem EX: NOF Corporation *18: Plandool-LG1: Manufactured by Nippon Fine Chemicals *19: Plandool-MAS: Manufactured by Nippon Fine Chemicals *20: Coatsome NC-21: NOF Corporation *21: SLP-LPC70H: Manufactured by Tsuji Oil Mills *22: Surf Hope SE Cosme C-1816: Manufactured by Mitsubishi Chemical Foods *23: KAK 139: Manufactured by Kokyu Alcohol Kogyo Co., Ltd. *24: S Face VL-212: Manufactured by Sakamoto Pharmaceutical Co., Ltd. *25: Seagem Collagen AS: manufactured by Katakura Chikkarin Co., Ltd. *26: Arfomarin-CL: manufactured by Technoble Co., Ltd. [Industrial Applicability]

[0046] According to the present invention, it is possible to provide an oil-in-water emulsion composition that has good storage stability, has a rich and thick feel when applied, and leaves the skin with excellent firmness and softness after application.

Claims

1. The following components (A) to (D) (A) 0.5 to 3% by weight of one or more selected from polyoxyethylene phytosterols and / or polyoxyethylene phytostanols (B) Glycerin monoalkyl ether 0.5 to 3% by weight (C) (Moringa oil / hydrogenated moringa oil) esters 0.5 to 8% by weight (D) 10 to 40% by weight of an oily component that is liquid at 25°C An oil-in-water emulsion composition comprising:

2. 2. The oil-in-water emulsion composition according to claim 1, wherein component (B) is glycerin monostearyl ether.

3. 3. The oil-in-water emulsion composition according to claim 1, further comprising component (E) phytosteryl hydroxystearate.

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