Air-containing oily cosmetic solid composition and cosmetic

Abstract

The purpose of the present invention is to provide an oily solid composition with which novel tactile feels and feelings of use that would not be obtained in a conventional art can be achieved. The present invention pertains to a bubble-containing oily solid composition which contains (A) an oily component that is solid at 25ºC and (B) an oily component that is liquid at 25ºC, and has a bubble content of 2-55%.

Description

[Technical Field]

[0001] The present invention relates to an oily solid composition containing bubbles and a cosmetic preparation containing said composition. [Background technology]

[0002] Compositions containing air bubbles are known in the food industry, such as sponge cakes and air-in chocolates, which create a variety of textures by incorporating air bubbles. Also, in the cosmetics industry, mousse cleansers with excellent foaming texture, skin care creams with a light and refreshing feel when used, and solid soaps with excellent foaming properties are known. Here, Patent Document 1 describes a whipped oily composition containing a fluorine-treated powder having a specific contact angle and an oily component having a specific surface tension in a specific ratio. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2015-020974 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of makeup products, there are few examples where gas has been used to achieve a new feel and sensation due to the difficulty of the specific molding techniques. The technology of Patent Document 1 is a powder-in-oil (P / O) type cosmetic containing fluorine-treated powder, and because it contains a high powder content, there is a limit to the amount of oil needed for moisturizing, which is problematic in that it limits the formulations and prescriptions that can be applied.

[0005] The present invention aims to provide an oily solid composition that contains air bubbles and thereby provides a new feel and sensation when used, which is not available in conventional technologies, and a cosmetic preparation containing said composition. [Means for solving the problem]

[0006] In order to solve the above problems, the present application provides the following inventions. [1] A bubble-containing oily solid composition comprising (A) an oily component that is solid at 25°C and (B) an oily component that is liquid at 25°C, and having a bubble content of 2 to 55%. [2] The kinematic viscosity of the oil component (B) is 15 to 48,000 mm 2 The bubble-containing oily solid composition according to [1], wherein the ratio of the total weight of the foam to the total weight of the oily solid composition is 1 / s. [3] The bubble-containing oily solid composition according to [1] or [2], wherein the oily component (A) contains a non-polar wax. [4] The bubble-containing oily solid composition according to any one of [1] to [3], wherein the oily component (B) contains at least one of a silicone oil and a hydrocarbon oil. [5] A cosmetic comprising the bubble-containing oily solid composition according to any one of [1] to [4]. [Effects of the Invention]

[0007] According to the present invention, it is possible to stably incorporate air bubbles into a solid base that is mainly formulated with oil, thereby providing a softer feel than a composition that does not contain air bubbles, and it is possible to provide an air-containing oily solid composition that can achieve a new feel and sensation of use that is not available with conventional technology. DETAILED DESCRIPTION OF THE INVENTION

[0008] <Oily based solid composition> ((A) Oily component that is solid at 25°C) The bubble-containing oily solid composition of the present invention (hereinafter also referred to as "oily solid composition") contains an oily component that is solid at 25°C (hereinafter also referred to as "solid oily component"). In the present invention, the solid oily component is a component that serves to solidify the preparation at room temperature and make it non-flowable.

[0009] The solid oil component is not particularly limited as long as it is one that is usually blended in cosmetics, and wax is preferably used. From the viewpoint of high temperature stability, the solid oil component preferably has a base whose solidification temperature is 60°C or higher, more preferably 60°C to 100°C.

[0010] Examples of waxes that can be used in the present invention include carnauba wax, candelilla wax, polyethylene wax, beeswax, ceresin, microcrystalline wax, solid paraffin, and Japan wax. From the viewpoint of achieving a softer feel when used, it is preferable to contain a non-polar wax such as polyethylene wax, ceresin, microcrystalline wax, or solid paraffin, and polyethylene wax is particularly preferable. These waxes can be used in combination of one or more.

[0011] The content of the solid oily component in the oily solid composition is preferably 3% by mass to 25% by mass, more preferably 3% by mass to 15% by mass, from the viewpoint of solidifying the preparation.

[0012] ((B) Oily component that is liquid at 25°C) The oily solid composition of the present invention contains an oily component that is liquid at 25°C (hereinafter also referred to as "liquid oily component").

[0013] In addition, from the viewpoint of preventing bubbles from escaping during solidification, the kinematic viscosity of the liquid oily component is preferably 15 mm 2 / s or more, preferably 20 mm 2 / s or more, particularly preferably 100 mm 2 / s or more, and preferably 48000 mm 2 / s or less, more preferably 20,000 mm 2 / s or less, and even more preferably 5000 mm 2 / s or less, particularly preferably 500 mm 2 / s or less. Here, the kinematic viscosity of the liquid oily component preferably refers to the kinematic viscosity of all the liquid oily components contained in the oily solid composition other than the solid oily components. For example, even if the kinematic viscosity of each liquid oily component does not fall within the above range, it is sufficient that the liquid oily components as a whole fall within the above range. When an oily solid composition contains multiple liquid oily components, the kinematic viscosity of the entire liquid oily component can be calculated using a kinematic viscosity-temperature chart based on the drawing method in Appendix 1 (specification) of the JIS standard (K 2283:2000) for estimating kinematic viscosity and blend ratio. In the present invention, the kinematic viscosity of the liquid oily component means the kinematic viscosity at 37°C.

[0014] The liquid oily component may be any oil normally used in cosmetics, and is not particularly limited. Specific examples include liquid oils and fats such as avocado oil, camellia oil, macadamia nut oil, mink oil, olive oil, castor oil, jojoba oil, triglycerin, and glycerin trioctanoate; hydrocarbon oils such as liquid paraffin, squalane, paraffin, ceresin, petrolatum, and squalene; higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, 12-hydroxystearic acid, isostearic acid, linoleic acid, and linolenic acid; higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol, monostearyl glycerol ether, monopalmityl glycerol ether, cholesterol, phytosterol, and isostearyl alcohol; isopropyl myristate, cetyl octanoate, octyldodecyl myristate, butyl stearate, decyl oleate, and ethylenediamine dioctanoate. Examples of the silicone oil include ester oils such as ethylene glycol, diisostearyl malate, trimethylolpropane trioctanoate, trimethylolpropane triisostearate, pentaolithritol tetraoctanoate, glycerin trioctanoate, glycerin triisostearate, ethyl acetate, butyl acetate, and amyl acetate; and silicone oils such as trimethylpentaphenyltrisiloxane, diphenyldimethicone, dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, silicone resins that form a three-dimensional network structure, silicone rubber, and various modified polysiloxanes (amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.), and one or more selected from these can be used. From the viewpoint of usability as a product after foaming, silicone oils or hydrocarbon oils are preferred, and as silicone oils, trimethylpentaphenyltrisiloxane and diphenyldimethicone are particularly preferred. These liquid oily components may be used alone or in combination of two or more. When two or more liquid oily components are used, they may be appropriately blended so that the kinematic viscosity of the entire liquid oily component falls within the above range.

[0015] The content of the liquid oily component in the oily solid composition is preferably 97% by mass or less from the viewpoint of maintaining the solid state.

[0016] (Other ingredients) In addition to the above components, the oily solid composition of the present invention may contain various optional components depending on the intended use, as long as the effects of the present invention are not impaired. When the oily solid composition of the present invention is used in, for example, cosmetics, various ingredients commonly used in cosmetics may be appropriately blended within the range that does not impair the effects of the present invention, such as powder components, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, moisturizers, water-soluble polymers, film-forming agents, sequestering agents, lower alcohols, polyhydric alcohols, sugars, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, bactericidal preservatives, other drugs, colorants, fragrances, water, etc.

[0017] Powder components that can be blended are those commonly used in cosmetics, etc. Specific examples include inorganic powders such as talc, kaolin, mica, silica, and zeolite; organic powders such as polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, styrene-acrylic acid copolymer resin powder, and cellulose powder; inorganic white pigments such as titanium dioxide and zinc oxide; inorganic red pigments such as iron oxide (red iron oxide); inorganic yellow pigments such as yellow iron oxide and ochre; black pigments such as black iron oxide and carbon black; inorganic green pigments such as chromium oxide, chromium hydroxide, and cobalt titanate; inorganic blue pigments such as ultramarine and Prussian blue; titanium dioxide-coated mica, colored titanium dioxide-coated mica, and oxidized titanium dioxide. Pearl pigments such as bismuth dichloride and fish scale foil; metal powder pigments such as aluminum powder and copper powder; organic pigments such as Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and Blue No. 404; and organic pigments such as zirconium, barium, or aluminum lakes such as Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow 202, Yellow No. 203, Green No. 3, and Blue No. 1. The content of powder components in the bubble-containing oily solid composition of the present invention is preferably 25% by mass or less, from the viewpoint of easily achieving a new feel and sensation when used.

[0018] (bubble content) The bubble-containing oily solid composition of the present invention has a bubble content of 2 to 55%. By satisfying this air bubble content, a new feel and sensation of use can be realized. Specifically, when the oily solid composition touches the fingers, the feel of the air bubbles contained in the composition, combined with the feel of whipped cream, gives the feeling of use. The bubble content is preferably 5 to 50%, more preferably 5 to 40%, and particularly preferably 20 to 40%. In the present invention, the bubble content is calculated as follows. Air bubble content = (X / Y) x 100 (%) X: Mass per unit volume of the aerated oily solid composition X of the present invention Y: Mass per unit volume of oily solid composition Y containing no bubbles, but with the same ingredients as bubble-containing oily solid composition X Oily solid composition Y containing no bubbles is produced by mixing the same ingredients as those of oily solid composition X containing bubbles with stirring while heating at a temperature higher than the solidification temperature of the solid oily ingredients, and then cooling to room temperature after stopping the stirring.

[0019] (house of cards structure) In the oily solid composition of the present invention, the solid oily component (A) preferably forms a house-of-cards structure at 25°C. Here, the house-of-card structure is a structure formed when solid oily components (particularly wax) take on a crystalline structure, and can be confirmed using a scanning electron microscope (SEM). The solid oily component forms a card-house structure, which prevents fluidity even at high temperatures and allows the product to maintain its solid shape, while simultaneously allowing air bubbles to be stably maintained within the product.

[0020] The bubble-containing oily solid composition of the present invention is useful, for example, as a cosmetic product, such as lipstick, hand cream, or hair cream.

[0021] <Manufacturing method> The oily solid composition of the present invention can be produced, for example, by the following method. Step 1: A solid oil component (A) at 25°C is mixed with a liquid oil component (B) at 25°C under heating to obtain a fluid. The heating conditions are such that the temperature is higher than the solidification initiation temperature of the solid oily component, preferably 70 to 100°C, and more preferably 90 to 100°C. Optional ingredients may be added from the beginning or once the oily ingredients have been thoroughly mixed.

[0022] Step 2: The fluid obtained in step 1 is stirred to incorporate air bubbles. For example, when producing 100 g, the stirring conditions are preferably a stirring blade with a diameter of 4 to 6 cm at a rotation speed of 2000 to 3000 rpm for 2 to 5 minutes. After sufficient stirring to obtain the desired amount of bubbles, the fluid is cooled to a temperature below the solidification initiation temperature of the solid oil component (A) to obtain the bubble-containing solid oily composition of the present invention.

[0023] Furthermore, stirring of the fluid is preferably stopped when the fluid temperature reaches a temperature lower than the solidification initiation temperature and higher than room temperature. After stirring is stopped, the fluid is cooled to room temperature. At temperatures below the solidification onset temperature and above room temperature, the solid oily component is not completely solid but remains in a semi-solid state. By stopping stirring while the oily composition contains air bubbles and still retains fluidity, a crystalline structure (house of cards structure) of the solid oily component is formed when the composition is cooled, while retaining the air bubbles. More preferably, stirring is stopped when the fluid temperature falls 3 to 15°C below the solidification onset temperature of the solid oily component, and even more preferably 5 to 10°C below, and the mixture is cooled to room temperature. By stopping stirring at this temperature, it is possible to form a house-of-cards structure while suppressing bubble escape. If stirring is continued at a temperature 15°C higher than the solidification onset temperature, much of the house-of-cards structure is likely to collapse, and fluidity may develop at high temperatures. When fluidity is developed, the enclosed bubbles are more likely to escape.

[0024] The solid oily composition may be processed into a desired shape after it has completely solidified, or the fluid may be filled into a container of a desired shape when it has become foamy, and then cooled to solidify. [Example]

[0025] The solid oily composition of the present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples in any way.

[0026] <Examples 1-1 to 1-10, Comparative Examples 1-1 to 1-3> The components shown in Table 1 were placed in a mixer in the proportions shown in Table 1 so that the total weight was 100 g, heated to 95°C, and stirred and mixed for 3 minutes at 2000 rpm using a 4 cm diameter stirring blade. When the components were completely dissolved, heating was stopped, and the mixture was stirred while cooling. After stirring was stopped at the stirring completion temperature shown in Table 1, the mixture was allowed to cool to room temperature, yielding a bubble-containing solid oily composition.

[0027] The methods for evaluating each physical property are as follows, and the results are shown in Table 1.

[0028] (bubble content) The bubble content was calculated as follows. Air bubble content = (X / Y) x 100 (%) X: Mass per unit volume of the composition of the example Y: The same amounts of solid oily component and liquid oily component as in the composition of the example were used, placed in a mixer, heated to 95°C, and mixed by stirring at 2000 rpm for 3 minutes using a stirring blade with a diameter of 4 cm. When completely dissolved, heating and stirring were stopped, and the composition was cooled to room temperature, and the mass per unit volume of the obtained composition was

[0029] (Kinematic viscosity) The dynamic viscosity of the liquid oil component at 37°C was measured using a rheometer. When multiple liquid oily ingredients are contained, the kinematic viscosity of all liquid oily ingredients was calculated from the measured kinematic viscosity of each liquid oily ingredient using a kinematic viscosity-temperature chart based on the drawing method of the kinematic viscosity and blend ratio estimation method in Appendix 1 (regulations) of the JIS standard (K 2283:2000).

[0030] (Fluidity (ease of flowing into container when filled)) The fluidity of the liquid was evaluated by sensory evaluation of the ease with which it spread in the container at the filling temperature, and a grade of C or higher was deemed acceptable. A: Spreads smoothly throughout the container B: It takes time to spread, but it spreads to the edge without any problems C: Vibrating the container spreads it to the edge D: The container does not spread even when it is vibrated. E: Does not solidify

[0031] (Difficulty in releasing bubbles) The difficulty of bubbles being removed after filling the composition was evaluated by sensory evaluation of the bubble content and the state of defoaming at the time of solidification, and a grade of C or higher was considered to be acceptable. A: The air bubble content is 2% or more, and defoaming is not visually observed upon solidification. B: The air bubble content is 2% or more, and some defoaming is visually observed upon solidification. C: The air bubble content is 2% or more, and defoaming is clearly observed visually upon solidification. D: Air bubble content is less than 2% E: Does not solidify

[0032] (Usability) The usability of the composition was evaluated by sensory evaluation when the surface was rubbed with the index finger, and a grade of D or higher was considered acceptable. A: It feels soft and the foam crumbles. B: Soft, with a slight feeling of the foam breaking down C: Soft, but the foam doesn't seem to break down. D: It is softer and less sticky than the one without bubbles. E: Does not solidify

[0033] [Table 1]

[0034] From the above results, all of the cosmetics of the examples in which the air bubble content was within the specified range exhibited good usability.

[0035] <Examples 2-1 to 2-6, Examples 3-1 to 3-4, Examples 4-1 to 4-15> Aerated solid oily compositions were obtained in the same manner as in Example 1-1, except that the ingredients and their proportions were changed to those shown in Tables 2 to 4. The evaluation results are shown in Tables 2 to 4.

[0036] [Table 2]

[0037] From the above results, it was found that even when the surfactant was changed, the bubble content was within the specified range and cosmetics with excellent usability were produced.

[0038] [Table 3]

[0039] The above results show that the air bubble content can be changed by changing the ratio of solid oily component to liquid oily component. When the air bubble content is 20% or more, ease of use and difficulty in removing bubbles are good, and when the air bubble content is 30% or more, a good balance of ease of use, fluidity and difficulty in removing bubbles is achieved.

[0040] [Table 4]

[0041] The above results show that even when various solid oily components and liquid oily components are combined, cosmetics can be produced that have an air bubble content within a specified range and are excellent in usability, etc. Furthermore, when the air bubble content is the same, cosmetics that contain a solid oily component that does not have a polar functional group, i.e., a non-polar solid oily component, have better usability.

[0042] Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. This application is based on a Japanese patent application (Patent Application No. 2020-191766) filed on November 18, 2020, the contents of which are incorporated herein by reference. [Industrial Applicability]

[0043] The bubble-containing solid oily composition of the present invention is useful for cosmetics and the like.

Claims

1. (A) an oily component that is solid at 25°C and (B) an oily component that is liquid at 25°C, and the air bubble content is 2 to 55%, (A) The solid oil component forms a house-of-cards structure at 25°C, (B) the liquid oil component has a kinematic viscosity of 15 to 47,000 mm 2 / s at 25°C; The bubble-containing oily cosmetic solid composition (B) wherein the oily component that is liquid at 25°C contains at least one of a silicone oil and a hydrocarbon oil.

2. The bubble-containing oily cosmetic solid composition according to claim 1, wherein the oil component (A) comprises a non-polar wax.

3. A cosmetic comprising the bubble-containing oily cosmetic solid composition according to claim 1 or 2.

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