Multi-layered liquid cosmetic

Abstract

To provide a multi-layered liquid cosmetic which is easily dispersed in a uniform state during shaking in which the interface of each layer is clearly separated during leaving to stand, has excellent aesthetic properties, is easily spread during application, is rapidly compatible with the skin, causes no stickiness on the skin after application and has an excellent skin moisturizing feeling.SOLUTION: There is provided a multi-layered liquid cosmetic comprising the following components (A) to (E), (A) a hydrocarbon oil which is liquid at 25°C, (B) a triglyceride oil which is liquid at 25°C, (C) a polyol, (D) a pH adjusting agent and (E) water, wherein the ratio of the component (C) in the water layer is 25 mass% or more.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a multi-layered liquid cosmetic composition. [Background technology]

[0002] Multi-layered cosmetic preparations are known which separate into multiple layers when left to stand and which must be shaken to uniformly disperse before application to the skin. For example, Patent Document 1 describes that a multi-layered cosmetic composition containing a specific nonionic surfactant, a polyhydric alcohol, and a specific liquid oil becomes uniformly dispersed when shaken, and when left to stand, the interfaces of the layers are clearly separated, resulting in an excellent aesthetic appearance and usability. Furthermore, Patent Document 2 describes that a two-layer cosmetic preparation containing a polyoxyethylene sorbitan fatty acid ester, sodium citrate, and a water-soluble polymer has a natural feel, excellent re-emulsification properties before use and two-layer separation properties after use, a beautiful appearance, and a high level of safety. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-119703 A [Patent Document 2] JP 2001-97841 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional multi-layered cosmetic compositions had the problem that they did not spread well and did not blend well with the skin when applied over a wide area of ​​the body. Furthermore, multi-layered cosmetics are required to maintain a uniformly dispersed state for a certain period of time during use, and to completely separate into multiple layers after use in the same state as before use. However, after shaking, the oil layer and the water layer do not easily separate and remain cloudy for a long time, posing an issue in terms of aesthetics. [Means for solving the problem]

[0005] The present inventors have discovered that by using a liquid hydrocarbon oil and a liquid triglyceride oil in combination with specific amounts of a polyol and a pH adjuster, it is possible to obtain a multi-layered liquid cosmetic which is easily uniformly dispersed when shaken, has clearly separate interfaces between each layer when left to stand, is excellent in aesthetics, spreads easily when applied, blends quickly with the skin, does not leave the skin sticky after application, and provides an excellent moisturizing feel to the skin.

[0006] The present invention relates to the following components (A) to (E): (A) a hydrocarbon oil that is liquid at 25°C; (B) a triglyceride oil that is liquid at 25°C; (C) a polyol, (D) pH adjuster, (E)Water Contains The present invention relates to a multi-layered liquid cosmetic composition, in which the proportion of component (C) in the aqueous layer is 25% by mass or more. Effect of the Invention

[0007] The multi-layered liquid cosmetic of the present invention easily becomes uniformly dispersed when shaken, and when left to stand, the interfaces of the layers are clearly separated, providing excellent aesthetics. In addition, the cosmetic is easy to spread when applied, quickly blends with the skin, does not leave the skin sticky after application, and provides an excellent moisturizing feel to the skin. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The component (A) used in the present invention is a hydrocarbon oil that is liquid at 25°C. The term "liquid" refers to something that has fluidity, and includes a paste-like state. Examples of the hydrocarbon oil of component (A) include squalane, liquid paraffin, liquid isoparaffin, light liquid isoparaffin, and heavy liquid isoparaffin. From the viewpoints of improving the ease of spreading during application and reducing stickiness on the skin after application, component (A) preferably contains one or more types selected from squalane, liquid paraffin, liquid isoparaffin, and light liquid isoparaffin, more preferably contains one or more types selected from squalane, liquid paraffin, and liquid isoparaffin, even more preferably contains one or more types selected from squalane and liquid isoparaffin, and even more preferably contains squalane.

[0009] Component (A) can be used alone or in combination of two or more kinds. From the viewpoints of improving the ease of spreading during application and reducing stickiness on the skin after application, the content is preferably 4 to 40 mass% of the total composition, more preferably 10 to 30 mass%, even more preferably 17 to 25 mass%, and even more preferably 19 to 23 mass%.

[0010] Component (B) is a triglyceride oil that is liquid at 25°C. The term "liquid" refers to something that has fluidity, and includes a paste-like state. Examples of component (B) include caprylic / capric triglyceride, 2-ethylhexanoic triglyceride, trimyristate, triisopalmitic triglyceride, trioleic triglyceride, triisostearate, glyceryl tripalmitate / stearic acid, and glyceryl trioleate / linoleate; and vegetable oils such as olive oil, jojoba oil, macadamia nut oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, rice bran oil, and evening primrose oil.

[0011] Component (B) preferably contains at least (b1) a triglyceride which is liquid at 25°C and which contains an alkyl chain having 10 or less carbon atoms, and (b2) a triglyceride which is liquid at 25°C and which contains an alkyl chain having more than 10 carbon atoms. Examples of component (b1) include tri(caprylic / capric acid)glycerin, tri-2-ethylhexanoic acid glycerin, etc. As component (b1), from the viewpoints of improving the ease of spreading when applied, improving the speed at which the composition is absorbed into the skin when applied, and reducing stickiness on the skin after application, tri(caprylic / capric acid)glycerin is preferred. Component (b1) can be used alone or in combination of two or more types. From the viewpoints of improving the ease of spreading upon application, improving the quickness of absorption into the skin upon application, and reducing stickiness on the skin after application, the content is preferably 1 to 20 mass% of the total composition, more preferably 4 to 15 mass%, even more preferably 4.5 to 10.7 mass%, and even more preferably 5.2 to 7.3 mass%.

[0012] Examples of component (b2) include glyceryl trimyristate, glyceryl triisopalmitate, glyceryl trioleate, glyceryl triisostearate, glyceryl tri(palmitate / stearate), glyceryl tri(oleate / linoleate); and vegetable oils such as olive oil, jojoba oil, macadamia nut oil, soybean oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, rice bran oil, and evening primrose oil. From the viewpoints of improving the ease of spreading when applied and improving the quickness with which the cosmetic composition is absorbed into the skin when applied, component (b2) preferably contains one or more oils selected from olive oil, macadamia nut oil, and soybean oil, more preferably contains one or more oils selected from olive oil and macadamia nut oil, and even more preferably contains macadamia nut oil. Component (b2) can be used alone or in combination of two or more kinds. From the viewpoints of improving the ease of spreading upon application, improving the quickness of absorption into the skin upon application, and improving the appropriate massage feeling during application, the content is preferably 0.5 to 10 mass % of the total composition, more preferably 1 to 5 mass %, and even more preferably 2.3 to 3.2 mass %.

[0013] When components (b1) and (b2) are used in combination as component (B), the mass ratio (b1) / (b2) of component (b1) to component (b2) is preferably 0.5 to 10, more preferably 1 to 4, and even more preferably 1.5 to 3, from the viewpoints of clearly separating the interfaces of the layers when left to stand, improving aesthetics, improving the ease of spread upon application, improving the quickness of absorption into the skin upon application, reducing stickiness of the skin after application, and improving the moisturizing feeling of the skin after application.

[0014] In the present invention, the mass ratio (b2) / [(A)+(b1)] of component (b2) to the total amount of component (A) and component (b1) is preferably 0.03 to 0.4, more preferably 0.05 to 0.2, and even more preferably 0.08 to 0.15, from the viewpoints of clearly separating the interfaces of the layers when left to stand, improving aesthetics, improving the ease of spread upon application, improving the quickness with which the composition blends into the skin upon application, reducing stickiness of the skin after application, improving the moisturizing feeling of the skin after application, and improving stability during low-temperature storage.

[0015] Component (B) can be used alone or in combination of two or more types, and from the viewpoints of improving the ease of spreading when applied, improving the quickness of absorption into the skin when applied, reducing stickiness on the skin after application, and improving the appropriate massage feeling during application, the content is preferably 2 to 24 mass% of the total composition, more preferably 4 to 17 mass%, even more preferably 5 to 13.3 mass%, and even more preferably 7 to 11 mass%.

[0016] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 0.5 to 5, more preferably 0.7 to 3, and even more preferably 1.9 to 2.5, from the viewpoints of clearly separating the interfaces of the layers when left to stand, improving aesthetics, improving the ease of spreading upon application, improving the speed at which the composition blends into the skin upon application, reducing stickiness of the skin after application, and improving the moisturizing feeling of the skin after application.

[0017] The polyol of component (C) is a compound having two or more hydroxyl groups in the molecule, and may be any of those commonly used in cosmetics. Examples of dihydric alcohols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,3-butylene glycol, 1,3-propanediol, and pentanediol. Examples of trihydric alcohols include glycerin and trimethylolpropane. Examples of tetrahydric alcohols include diglycerin and erythritol. Examples of polyhydric alcohols having a valence of five or more include polyglycerins such as triglycerin; sugars and sugar alcohols such as glucose, maltose, maltose, sucrose, xylitol, sorbitol, malbitol, polyoxyethylene methyl glucoside, polyoxyethylene ethyl glucoside, and polyoxyethylene propylene glucoside.

[0018] The polyol of component (C) preferably contains one or more selected from propylene glycol, 1,3-butylene glycol, 1,3-propanediol, dipropylene glycol, ethylene glycol, polyethylene glycol, tripropylene glycol, polypropylene glycol, glycerin, trimethylolpropane, diglycerin and erythritol, from the viewpoints of clearly separating the interfaces of the layers when left to stand and improving aesthetics, improving dispersibility to provide a uniformly dispersed state when shaken, and improving the speed of separation into multiple layers when left to stand after shaking. More preferably, the glycol / glycerin mixture contains one or more selected from ethylene glycol, propylene glycol, dipropylene glycol, 1,3-butylene glycol, 1,3-propanediol, glycerin, and diglycerin; even more preferably, the glycol / glycerin mixture contains one or more selected from dipropylene glycol, 1,3-butylene glycol, 1,3-propanediol, and glycerin; and even more preferably, the glycol / glycerin mixture contains one or more selected from dipropylene glycol, 1,3-butylene glycol, 1,3-propanediol, and glycerin, and particularly preferably, the glycol / glycerin mixture contains glycerin.

[0019] Component (C) can be used alone or in combination of two or more types, and the content is preferably 5 to 50 mass% of the total composition, more preferably 15 to 40 mass%, even more preferably 22 to 34 mass%, and even more preferably 26 to 30 mass%, from the viewpoints of clearly separating the interfaces of each layer when left to stand, improving aesthetics, improving the speed at which the skin absorbs when applied, reducing stickiness on the skin after application, improving the moisturizing feel of the skin after application, improving dispersibility so that a uniformly dispersed state is achieved when shaken, and improving the speed of separation into multiple layers when left to stand after shaking.

[0020] In the present invention, the proportion of component (C) in the aqueous layer is 25% by mass or more, preferably 25 to 60% by mass, more preferably 28 to 55% by mass, and even more preferably 35 to 45% by mass, from the viewpoints of clearly separating the interfaces of the layers when allowed to stand, improving aesthetics, improving dispersibility so that a uniformly dispersed state is achieved when shaken, and improving the uniformity of the oil layer when allowed to stand after shaking.

[0021] The pH adjuster of component (D) may be any that is commonly used in cosmetics, preferably inorganic acids and their salts, and organic acids and their salts having 6 or less carbon atoms, and more preferably organic acids and their salts having 6 or less carbon atoms. The inorganic acid preferably includes, for example, one or more acids selected from hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphonic acid, phosphinic acid, and salts thereof, and more preferably includes one or more acids selected from phosphoric acid and salts thereof. Moreover, the organic acid having 6 or less carbon atoms and salts thereof are preferably water-soluble organic acids and salts thereof, and examples thereof include fatty acids, hydroxy acids, dicarboxylic acids, acidic amino acids and salts thereof having 1 to 6 carbon atoms. Among these, it is preferable to include one or more selected from malic acid, lactic acid, citric acid, succinic acid, acetic acid, tartaric acid, glutamic acid, aspartic acid, adipic acid and salts thereof, more preferably to include one or more selected from malic acid, lactic acid, citric acid, succinic acid and salts thereof, and even more preferably to include one or more selected from citric acid and salts thereof. The pH adjuster of component (D) preferably contains both an acid and a salt thereof. When the pH adjuster contains both an acid and a salt thereof, the mass ratio of the acid content to the salt content, (acid) / (salt), is preferably 1 to 5, more preferably 1 to 3, even more preferably 1 to 2, and even more preferably 1 to 1.5.

[0022] Component (D) can be used alone or in combination of two or more kinds. From the viewpoint of clearly separating the interfaces of the layers when left to stand and improving aesthetics, the content is preferably 0.015 to 0.12 mass % of the total composition, more preferably 0.02 to 0.09 mass %, and even more preferably 0.05 to 0.08 mass %.

[0023] From the viewpoint of improving dispersibility so that a uniformly dispersed state is obtained upon shaking, the content of water in the component (E) is preferably 10 to 60 mass% of the total composition, more preferably 30 to 50 mass%, and even more preferably 38 to 45 mass%.

[0024] In addition to the above-mentioned components, the multi-layered liquid cosmetic of the present invention may contain components used in ordinary cosmetics, such as oily components other than the above-mentioned components, surfactants, moisturizing agents other than polyols, ultraviolet absorbers, ultraviolet scattering agents, thickeners, sequestering agents, antioxidants, antibacterial agents, preservatives, antiperspirants, medicines, powders, coloring agents, fragrances, animal and plant extracts, etc. These components are not limited to their respective uses as individual agents, and may be diverted for other uses depending on the purpose, for example, an antiperspirant may be used as a fragrance, or may be used in combination with other uses, for example, to exert the effects of both an antiperspirant and a fragrance.

[0025] The multi-layered liquid cosmetic of the present invention can be produced by appropriately mixing the specified components, for example, by mixing all of the oily components to prepare an oil layer, mixing all of the aqueous components to prepare an aqueous layer, and then mixing the oil layer and the aqueous layer in a specified ratio.

[0026] In the multi-layered liquid cosmetic of the present invention, the interfaces of the layers are clearly separated when left to stand, and from the viewpoint of improving aesthetics, the mass ratio of all oil layer components to all aqueous layer components, (oil layer) / (aqueous layer), is preferably 0.1 to 1, more preferably 0.2 to 0.7, and even more preferably 0.35 to 0.55.

[0027] In the multi-layered liquid cosmetic of the present invention, from the viewpoints of improving aesthetics by clearly separating the interfaces of the layers when left to stand, improving dispersibility by achieving a uniformly dispersed state when shaken, and improving the uniformity of the oil layer when left to stand after shaking, the aqueous layer preferably has a pH of 5 or less, more preferably a pH of 3 to 5, even more preferably a pH of 4 to 5, and even more preferably a pH of 4.5 to 5. In the present invention, the pH refers to the pH of the aqueous layer alone, and is measured using a pH meter at 25° C. without diluting the aqueous layer.

[0028] In the multi-layered liquid cosmetic of the present invention, each layer is preferably transparent when left to stand. "Transparent" means that when the multi-layered liquid cosmetic is placed in a transparent glass container and letters are placed on the back of the container, the letters can be clearly seen when observed from the front.

[0029] Furthermore, the multi-layered liquid cosmetic of the present invention is liquid, and when left to stand, the viscosity at 25°C of each layer is preferably 1 mPa·s or more, more preferably 3 mPa·s or more, and even more preferably 5 mPa·s or more, and is preferably 500 mPa·s or less, more preferably 300 mPa·s or less, and even more preferably 100 mPa·s or less. In the present invention, the viscosity is measured using a Brookfield viscometer (Vismetron viscometer: Model VS-A1 (manufactured by Shibaura Systems), rotor No. 1, 30 rpm, 30 seconds).

[0030] The multi-layered liquid cosmetic of the present invention is a cosmetic that maintains a multi-layered separated state of two or more layers, having an oil layer containing at least components (A) and (B) and an aqueous layer containing at least components (C), (D) and (E) in a mutually incompatible state when left to stand, and can be made into a uniformly dispersed state by shaking when used, and gradually returns to its original multi-layered separated state. Examples include a two-layered cosmetic consisting of an oil layer-aqueous layer, and a three-layered cosmetic consisting of an oil layer-oil layer-aqueous layer.

[0031] The multi-layered liquid cosmetic of the present invention has at least an oil layer and an aqueous layer, and in this case, when left to stand, the oil layer is present on the opening side (upper side) of the container, and the aqueous layer is present on the bottom side (lower side) of the container.

[0032] The multi-layered liquid cosmetic composition of the present invention has an excellent aesthetic appearance, is not sticky after application, and has an excellent moisturizing feel, and therefore can be used by applying it to the skin, preferably to the skin excluding the scalp, and more preferably to the face, body, hands, feet, etc., for purposes such as heat retention, anti-aging, whitening, packs, massage, sunscreen, makeup base, foundation, lip balm, cleansing agent, etc., and is therefore suitable as a skin cosmetic composition. In particular, from the viewpoints of ease of spreading and quickness of skin affinity upon application, it is suitable as a massage cosmetic, and more suitable as a body massage cosmetic. EXAMPLES

[0033] Examples 1 to 9, Comparative Examples 1 to 2 Two-layer liquid cosmetics (body oil compositions) having the compositions shown in Table 1 were produced, and the pH of the aqueous layer was measured, and the ease of spreading when applied, the quickness of skin absorption when applied, the lack of stickiness on the skin after application, the moisturizing feeling of the skin after application, and the aesthetics were evaluated. The results are also shown in Table 1. In each of the two-layer liquid cosmetics of the Examples and Comparative Examples, when separated into two layers, both the oil layer and the aqueous layer had a transparent appearance.

[0034] (Manufacturing method) An oily component containing components (A) and (B) was mixed to prepare an oily layer, and an aqueous component containing components (C), (D) and (E) was mixed to prepare an aqueous layer. The oily layer and the aqueous layer were mixed to produce a two-layer liquid cosmetic.

[0035] (Evaluation method) (1) pH: Using a pH meter (Horiba Handy Type D71), the electrode was placed in the water layer at 25°C and left to stand for 30 seconds before measurement.

[0036] (2) Ease of spreading when applied, how quickly it absorbs into the skin when applied, no stickiness on the skin after application, moisturizing feeling on the skin after application: Three evaluators first applied 0.5g of each two-layer liquid cosmetic to the entire area of ​​one arm from the wrist to the upper arm and shoulder with one hand, then applied 0.5g to each area of ​​one leg from the toes to the knee and from above the knee to the base of the thigh. The ease of spreading when applied, how quickly the product absorbed into the skin when applied, how non-sticky the skin was after application, and the moisturizing feeling of the skin after application were evaluated according to the following criteria. The results were shown as the total score of the three evaluators. The quickness of skin compatibility refers to the fact that a two-layer liquid cosmetic composition can be spread lightly at the beginning of application, but as application time progresses, resistance is felt in the hands spreading it, and the sense of adhesion between the skin and the hands that applied it increases.

[0037] (2-1) Ease of spreading when applying: 4: Easy to spread. 3: Fairly easy to spread. 2: A little difficult to spread. 1: Difficult to spread.

[0038] (2-2) How quickly the product absorbs into the skin upon application: 4: It absorbs quickly into the skin. 3: It blends into the skin rather quickly. 2: It takes a little time for the skin to absorb. 1: The skin takes a long time to adapt.

[0039] (2-3) Non-sticky feeling on skin after application: 4: Non-sticky. 3: Almost non-sticky. 2: Slightly sticky. 1: Sticky.

[0040] (2-4) Moisturizing feeling on skin after application: 4: Has a moisturizing feel. 3: Slightly moisturizing. 2: Not very moisturizing. 1: No moisturizing feeling.

[0041] (3) Aesthetics: 10 g of each two-layer liquid cosmetic was placed in a container (Mighty Vial No. 4, manufactured by Maruel Co., Ltd.), the container was held in one hand, and the container was shaken up and down 10 times to mix, then left to stand, and the time it took for the cosmetic to separate was evaluated visually. The separated aqueous and oily layers were both clearly transparent to the naked eye. The time it took to separate was shown in 10-second increments. Separation was preferably achieved in 1 minute 30 seconds to 5 minutes, more preferably in 2 minutes to 3 minutes, and even more preferably in 2 minutes 10 seconds to 2 minutes 50 seconds.

[0042] [Table 1]

[0043] Prescription Examples 1-4 In the same manner as in Examples 1 to 9, two-layer liquid cosmetic compositions having the compositions shown in Table 2 were produced. All of the two-layer liquid cosmetics of Formulation Examples 1 to 4 have excellent transparency, easily become uniformly dispersed when shaken, and when left to stand, the interfaces of each layer are clearly separated, making them aesthetically pleasing. In addition, they are easy to spread when applied, quickly blend into the skin, do not leave the skin sticky after application, and provide an excellent moisturizing feel to the skin.

[0044] [Table 2]

Claims

Claim 1 The following components (A) to (E): (A) A hydrocarbon oil that is liquid at 25°C, (B) A triglyceride oil that is liquid at 25°C, (C) A polyol, (D) A pH adjuster, (E) Water containing: A multi-layer liquid cosmetic in which the proportion of component (C) in the aqueous layer is 25% by mass or more. Claim 2 The multi-layer liquid cosmetic according to Claim 1, wherein the mass ratio of the oil layer to the aqueous layer (oil layer) / (aqueous layer) is 0.1 to 1. Claim 3 The multi-layer liquid cosmetic according to Claim 1 or 2, wherein the aqueous layer has a pH of 5 or less. Claim 4 The multi-layer liquid cosmetic according to Claim 1 or 2, wherein component (D) contains one or more selected from inorganic acids and their salts, organic acids having 6 or fewer carbon atoms and their salts. Claim 5 The multi-layer liquid cosmetic according to Claim 1 or 2, wherein component (B) contains at least (b1) a triglyceride that is liquid at 25°C and contains an alkyl chain having 10 or fewer carbon atoms, and (b2) a triglyceride that is liquid at 25°C and contains an alkyl chain having more than 10 carbon atoms.