Emulsion composition

Abstract

To provide an emulsion composition using a polysaccharide containing rhamnose as a constituent monosaccharide, which, while having relatively low viscosity, exhibits superior stability and delivers a pleasant tactile sensation as cosmetics.SOLUTION: An emulsion composition comprising: (A) a polysaccharide having rhamnose as a constituent monosaccharide; (B) 1 mass% or more oil agent, which contains 40% or more of a polar oil; and (C) more than 0 mass% and less than 2 mass% of surfactant that is solid or semi-solid at 20°C. Therein a ratio Va / Vs is less than 0.95 where: Va is viscosity after stirring; and Vs is viscosity at rest.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an emulsion composition.

[0002] Polysaccharides containing rhamnose as a constituent monosaccharide are known as ingredients of cosmetics and the like, and an example of such polysaccharides is gellan gum.

[0003] For example, Patent Document 1 discloses a cosmetic that is non-sticky and provides a refreshing feel when used by blending native gellan gum with sugars or polyhydric alcohols. Patent Document 2 also discloses a cosmetic that contains native gellan gum and has stably dispersed air bubbles within the cosmetic, providing a uniquely pleasant feel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3802227 [Patent Document 2] Patent No. 3652549 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide an emulsion composition using a polysaccharide having rhamnose as a constituent monosaccharide, which has a relatively low viscosity but excellent stability, and also has an excellent feel as a cosmetic. [Means for solving the problem]

[0006] The inventors of the present invention discovered that the desired effects can be obtained by combining a polysaccharide having rhamnose as a constituent monosaccharide with a specific amount of an oil agent mainly composed of a polar oil and a specific amount of a solid or semi-solid surfactant to form an emulsion composition with specific viscosity characteristics, and thus completed the present invention.

[0007] The present invention can be realized by the following configuration. [1] Components (A), (B) and (C): (A) Polysaccharides containing rhamnose as a constituent monosaccharide (B) Oil containing 40% or more polar oil: 1% by mass or more (C) Solid or semi-solid surfactants at 20°C: More than 0% by mass but less than 2% by mass Contains The ratio Va / Vs of the viscosity at rest (Vs) to the viscosity after stirring (Va) is less than 0.95. Emulsifying composition.

[0008] [2] The emulsion composition according to [1], which is substantially free of microgel.

[0009] [3] The emulsion composition according to [1] or [2], which is substantially free of salts that are gelation promoters or cross-linking agents.

[0010] [4] The emulsion composition according to any one of [1] to [3], wherein the component (A) is gellan gum.

[0011] [5] The emulsion composition according to any one of [1] to [4], wherein the content of component (A) is more than 0% by mass and less than 0.3% by mass.

[0012] [6] The emulsion composition according to any one of [1] to [5], which is a sunscreen cosmetic, a skin care cosmetic, or a makeup cosmetic.

[0013] [7] A mist-type cosmetic preparation obtained by filling the emulsion composition according to any one of [1] to [6] in a spray container.

[0014] [8] A method for producing the emulsion composition according to any one of [1] to [6], A step of preparing an aqueous phase in which component (A) is uniformly dissolved; and The method includes a step of adding component (B) as an oil phase to the aqueous phase and mixing the components, At least one of the aqueous phase and the oil phase before the addition and mixing contains the component (C). A manufacturing method (excluding a manufacturing method that includes a step of forming a microgel containing component (A)). [Effects of the Invention]

[0015] According to the present invention, it is possible to provide an emulsion composition that has a relatively low viscosity and excellent stability. According to the present invention, an emulsion composition that also has an excellent feel as a cosmetic can be provided. According to the present invention, an emulsion composition having excellent sprayability can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present invention will be described in detail below. In this specification, the content of each component is based on the total mass of the emulsion composition, unless otherwise specified.

[0017] The emulsion composition of the present invention contains components (A) a polysaccharide, (B) an oil, and (C) a surfactant, and the emulsion type is typically oil-in-water.

[0018] <Component (A) polysaccharide> The component (A) used in the present invention is a polysaccharide having rhamnose as a constituent monosaccharide, and one or more types can be used. Examples of such polysaccharides include gellan gum and karaya gum, with gellan gum being preferred. Gellan gum includes native gellan gum and deacylated gellan gum, with native gellan gum being particularly preferred, but is not limited thereto.

[0019] The content of component (A) in the emulsion composition of the present invention is more than 0% by mass, preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.02% by mass or more. The upper limit is preferably less than 0.3% by mass, and more preferably 0.2% by mass or less.

[0020] It is known that polysaccharides of component (A), such as gellan gum, can form microgels depending on the preparation method (see, for example, Japanese Patent No. 3531735 (Example 6)). However, the presence of such microgels is not necessary in the present invention. Therefore, it is preferable that the emulsion composition of the present invention is substantially free of microgels. Here, "substantially free of microgels" means that microgels with particle sizes of 0.1 μm or more are not detected, or, if detected, are present in an amount of less than 0.005% by mass. Microgels can be detected and measured using a commercially available laser diffraction / scattering particle size distribution analyzer (e.g., LA-960 manufactured by Horiba, Ltd.).

[0021] In order to obtain the effects of component (A) in the present invention, the addition of salts that act as gelation accelerators or cross-linking agents, such as calcium salts, magnesium salts, sodium salts, and potassium salts, is not particularly required. Specific examples of such salts include calcium chloride, calcium glutamate, calcium lactate, calcium citrate, calcium hydroxide, magnesium chloride, magnesium sulfate, sodium chloride, and potassium chloride. Therefore, in one embodiment, the emulsion composition of the present invention may be substantially free of salts that act as gelation accelerators or cross-linking agents. Here, "substantially free of salts" means that the content of the relevant salts is less than 0.001% by mass. Note that ionic surfactants used as the surfactant of component (C) are not included in the "salts" referred to here.

[0022] <Component (B) Oil> Component (B) used in the present invention is an oil agent in which polar oil accounts for 40% or more, and one or more types can be used. Here, the ratio of polar oil in the oil agent refers to the mass % relative to the total amount of the oil agent. In component (B), polar oil preferably accounts for 60% or more, and more preferably 80% or more. Polar oils are generally said to be difficult to stabilize in emulsion compositions, but by incorporating the structure of the present invention, excellent stability can be achieved.

[0023] The polar oil is not particularly limited as long as it is one that is commonly used in cosmetics, quasi-drugs, and pharmaceuticals. The IOB value is not particularly limited, but is preferably 0.05 to 1.0. Examples of polar oils include natural vegetable oils such as olive oil (0.16), jojoba oil (0.07), and shea butter (0.16); ester oils such as ethylhexyl palmitate (0.13) and triethylhexanoin (0.35); higher alcohol oils such as stearyl alcohol (0.28); and ultraviolet absorbers such as ethylhexyl methoxycinnamate (0.28), ethylhexyl salicylate (0.60), and diethylaminohydroxybenzoylhexylbenzoate (0.68) (the IOB value is shown in parentheses).

[0024] Component (B) may contain oils other than polar oils, i.e., non-polar oils and / or silicone oils, as long as the content is less than 60%. In component (B), the non-polar oils and / or silicone oils are preferably less than 40%, more preferably less than 20%. Examples of non-polar oils include hydrocarbon oils such as liquid paraffin (mineral oil) and squalane. Examples of silicone oils include linear silicone oils such as dimethylpolysiloxane and methylphenylpolysiloxane; and cyclic silicone oils such as octamethylcyclotetrasiloxane.

[0025] The content of component (B) in the emulsion composition of the present invention is 1% by mass or more, preferably 2% by mass or more, and more preferably 3% by mass or more. The upper limit of the content is not particularly limited, but is preferably 30% by mass or less, and more preferably 20% by mass or less.

[0026] <Component (C) Surfactant> The surfactant of component (C) used in the present invention is a solid or semi-solid surfactant at 20°C, and one or more types can be used. Here, "semi-solid" excludes liquids, and refers to a state in which the surfactant has no fluidity at 20°C under atmospheric pressure, is substantially undeformable in the absence of stress, but deforms when slight stress is applied. Typically, this refers to a surfactant having a melting point or softening point of 25 to 50°C under atmospheric pressure (examples include polyglyceryl-10 myristate and ceteth-10). Here, the term "surfactant" refers to a monomer compound having surface activity. While there are no particular limitations on the surfactant that can be used, nonionic surfactants and / or anionic surfactants are preferred.

[0027] Preferred examples of nonionic surfactants include polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, sucrose fatty acid esters, etc. Here, the number of moles of ethylene oxide or glycidol added, the number of carbon atoms of the fatty acid, etc. are selected so that the surfactant is in a solid or semi-solid state at 20°C.

[0028] Specific examples of preferred nonionic surfactants include polyglyceryl-10 stearate, polyglyceryl-10 distearate, polyglyceryl-40 stearate, polyglyceryl-10 myristate, glyceryl stearate, polyoxyethylene (10) cetyl ether (ceteth-10), and the like.

[0029] Preferred examples of anionic surfactants include acylmethyltaurine salts, acylamino acid salts, acyllactates, and alkylphosphate esters, where the number of carbon atoms in the acyl group or alkyl group is selected so that the surfactant is in a solid or semi-solid state at 20°C.

[0030] Examples of acyl methyl taurine salts include sodium stearoyl methyl taurine, etc. Examples of acyl amino acid salts include sodium stearoyl glutamate, sodium stearoyl methyl alanine, sodium dilauramidoglutamide lysine (sodium dilauramidoglutamine lysine), etc. Examples of acyl lactate salts include sodium stearoyl lactylate, etc.

[0031] The content of component (C) is more than 0% by mass and less than 2% by mass. The upper limit is preferably 1.5% by mass or less, more preferably 1.0% by mass or less, even more preferably 0.5% by mass or less, and even more preferably 0.3% by mass or less. The lower limit is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more.

[0032] <Viscosity characteristics> The emulsion composition of the present invention has a ratio of the viscosity at rest (Vs) to the viscosity after stirring (Va), Va / Vs, of less than 0.95. A slight decrease in viscosity upon stirring can achieve both stability of the emulsion state during static storage and a favorable feel on the skin, such as good spreadability, during use. Having such viscosity characteristics also contributes to the quality stability of the emulsion composition, for example, stability when stored at extreme temperatures, and improved suspendability when powder components are included. Viscosity measurements can be performed using a BL-type viscometer under the conditions described in the Examples below.

[0033] The upper limit of the ratio Va / Vs is preferably less than 0.94, more preferably less than 0.93. The lower limit of the ratio Va / Vs is not particularly limited, but is preferably 0.6 or greater, more preferably 0.7 or greater. The specific viscosity of the emulsion composition is not particularly limited, but is typically 20 to 30,000 mPa·s, preferably 100 to 25,000 mPa·s, and more preferably 300 to 20,000 mPa·s, as the viscosity upon standing.

[0034] <Other ingredients> When the emulsion composition of the present invention is used as a sunscreen cosmetic, in addition to containing a polar oil as an ultraviolet absorber as at least a part of component (B), it may also contain an inorganic powder as an ultraviolet scattering agent. Examples of inorganic powders include titanium oxide, iron oxide, and zinc oxide, each of which has been surface-treated as needed. The emulsion composition of the present invention can maintain good stability even when containing an appropriate amount of such inorganic powder.

[0035] <Aqueous component> The aqueous component used in the present invention forms an aqueous phase in the emulsion composition. The aqueous component, in addition to water, is not particularly limited as long as it is a water-soluble component, and examples thereof include monohydric alcohols such as ethanol; and polyhydric alcohols such as glycerin, propylene glycol, dipropylene glycol, and butylene glycol. When a monohydric alcohol is used, its content is preferably less than 20% by mass, more preferably 10% by mass or less, and even more preferably 5% by mass or less. Furthermore, the total content of the monohydric alcohol and polyhydric alcohol is preferably less than 30% by mass, more preferably 20% by mass or less, and even more preferably 15% by mass or less.

[0036] <Additional ingredients> In addition to the above-mentioned components, the emulsion composition of the present invention may contain various additive components such as deodorant components, activating components, anti-inflammatory components, anti-allergic components, whitening components, vitamins, pH adjusters, antioxidants, preservatives, fragrances, and colorants, depending on the intended use and within a range that does not impair the effects of the present invention.

[0037] The method for producing the emulsion composition of the present invention is not particularly limited, and it can be prepared according to a conventional method. Specifically, the emulsion composition of the present invention can be obtained by preparing an aqueous phase in which the polysaccharide of component (A) is uniformly dissolved, and then adding the oily agent of component (B) as an oil phase to the aqueous phase and mixing them. In this case, the surfactant of component (C) can be added and contained in either the aqueous phase or the oil phase, or both, depending on its properties, before the above-mentioned adding and mixing operation.

[0038] As described above, in the present invention, it is not necessary to provide component (A) as a microgel. Since the burden of an additional preparation step for forming a microgel can be avoided, the emulsion composition of the present invention can be produced relatively easily. Therefore, typically, production methods that include a step of forming a microgel containing component (A) are excluded from the scope of the production method for the emulsion composition of the present invention.

[0039] The emulsion composition of the present invention can be suitably used as a cosmetic product, such as a sunscreen cosmetic product; a skin care cosmetic product such as an emulsion, a beauty serum, a lotion, or a face pack; or a makeup cosmetic product such as a makeup base, a foundation, an eye shadow, a blush, an eyeliner, a mascara, or a lipstick.

[0040] When the inner surface of a cosmetic container is made of a synthetic resin, the emulsion state of the contained emulsion composition tends to become unstable, but the emulsion composition of the present invention has excellent stability and is therefore highly compatible with such containers.In addition, the emulsion composition of the present invention has excellent sprayability, so it is also preferably provided as a mist-type cosmetic filled in a spray (atomizing) container such as a pump-type container or a trigger-type container. [Example]

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

[0042] (Examples 1 to 5 and Comparative Examples 1 to 7) Oil-in-water emulsion compositions having the component compositions shown in Table 1 were prepared by the following method, and evaluated for non-stickiness, storage stability in the emulsion state, viscosity characteristics, and sprayability. The results are also shown in Table 1.

[0043] (Preparation of oil-in-water emulsion composition) A gelling agent corresponding to component (A) was added to water heated to approximately 80°C and dissolved uniformly. After this, aqueous components other than water and a trace amount of preservative were mixed to prepare an aqueous phase. On the other hand, an oil solution corresponding to component (B) was prepared as an oil phase. A surfactant corresponding to component (C) was added to the aqueous phase and / or oil phase as appropriate. The oil phase was added to the stirred aqueous phase and mixed to obtain the desired oil-in-water emulsion composition.

[0044] (Method for evaluating non-stickiness) Five trained panelists applied 15 μL of each water-in-oil liquid emulsion composition to the skin of each individual, spread it over a circular area with a diameter of 4 cm, and left it for 3 hours. After that, they touched the applied area and asked whether it felt sticky or not, and evaluated it according to the following criteria. A: 5 people answered that they did not feel sticky. B: 3-4 people answered that they did not feel sticky C. Less than 2 people answered that they did not feel sticky

[0045] (Method for evaluating storage stability) The oil-in-water emulsion composition of each example was stored at 50°C for 2 weeks, and then the appearance was visually observed and the results were evaluated according to the following criteria. A No changes in appearance were observed. B Slight changes in appearance (separation, water release) were observed. C. Obvious changes in appearance (separation, water release) were observed.

[0046] (Method for evaluating viscosity characteristics) Measurements were performed using a BL-type viscometer at 30°C. Each oil-in-water emulsion composition was left to stand overnight and then rotated for 60 seconds, after which the value measured was recorded as the static viscosity (Vs). The composition was then shaken 10 times, and the value obtained under the same conditions as for measuring the static viscosity (Vs) was used as the post-agitation viscosity (Va), from which Va / Vs was calculated.

[0047] (Sprayability evaluation method) A Micro Mist Spray Bottle (Okaushio Co., Ltd.) was used as a spray container, and more than half of each oil-in-water emulsion composition was filled. At room temperature, the composition was sprayed onto a black flat resin from a distance of 15 cm, and the degree of spreading of the droplets was observed. Spraying was performed three times, and the average value was evaluated according to the following criteria. A: The droplets were easily ejected and spread over a range of 10 cm or more. B: The droplets were easily dispensed and spread less than 5 cm. C. Dispensing was difficult and the droplet spread was less than 5 cm.

[0048] [Table 1]

[0049] The gellan gum used was "Kelcogel (registered trademark) HM" (MP Gokyo Food & Chemical Co., Ltd.) (the same applies to the following formulation examples).

[0050] As shown in the results in Table 1, Examples 1 to 5, which have the component compositions defined as the present invention, were good in all evaluations. In Example 2, the amount of surfactant was slightly increased compared to Example 1, and some stickiness was observed, but it was within the acceptable range.

[0051] On the other hand, Comparative Examples 1 to 7 all showed clearly inferior results in terms of storage stability. Desired viscosity characteristics were not obtained in Comparative Examples 1 and 7, which used agar as the gelling agent, and Comparative Example 2, which used hydroxypropyl methylcellulose. Comparative Example 2 also showed clearly inferior sprayability. Comparative Examples 3 and 6, which used mineral oil as the entire or main part of the oil agent, demonstrate that storage stability could not be ensured when the proportion of non-polar oil was increased. Comparative Example 6 also showed a poor stickiness rating. Comparative Example 4, in which the amount of surfactant was greatly increased, showed clearly inferior stickiness ratings and sprayability. Comparative Example 5, which used PEG-10 dimethicone as the surfactant (emulsifier), demonstrates that the incorporation of a liquid surfactant also reduced the stickiness rating.

[0052] Examples of formulations for producing the emulsion composition of the present invention are shown below. All values ​​in the table are in "% by mass." (Formulation example 1: foundation emulsion) [Table 2]

[0053] (Formulation example 2: Moisturizing cream) [Table 3]

[0054] (Formulation example 3: foundation cream) [Table 4]

[0055] (Formulation example 4: Moisturizing mist) [Table 5]

Claims

1. Components (A), (B) and (C): (A) Polysaccharides having rhamnose as a constituent monosaccharide (B) Oil solution containing polar oil in an amount of 40% or more: 1% by mass or more (C) Surfactants that are solid or semi-solid at 20°C: More than 0% by mass but less than 2% by mass Contains The ratio Va / Vs of the viscosity at rest (Vs) to the viscosity after stirring (Va) is less than 0.95; Emulsifying composition.

2. The emulsion composition according to claim 1, which is substantially free of microgels.

3. 3. The emulsion composition according to claim 1, which is substantially free of salts that are gelation promoters or crosslinking agents.

4. The emulsion composition according to claim 1 or 2, wherein component (A) is gellan gum.

5. The emulsion composition according to claim 1 or 2, wherein the content of component (A) is more than 0 mass% and less than 0.3 mass%.

6. 3. The emulsion composition according to claim 1, which is a sunscreen cosmetic, a skin care cosmetic, or a makeup cosmetic.

7. A mist-type cosmetic preparation obtained by filling the emulsion composition according to claim 1 or 2 into a spray container.

8. A method for producing the emulsion composition according to claim 1 or 2, A step of preparing an aqueous phase in which component (A) is uniformly dissolved; and The method includes a step of adding component (B) as an oil phase to the aqueous phase and mixing the components, At least one of the aqueous phase and the oil phase before the addition and mixing contains the component (C). A manufacturing method (excluding a manufacturing method that includes a step of forming a microgel containing component (A)).

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