JP2020075898A - Liquid cosmetics - Google Patents

Abstract

To manufacture cosmetics, in which spherical oily scrubs are dispersed, so as to have highly moisturizing properties without stickiness in use, have excellent product aesthetics and usability, and comprise scrubs with vibration stability, as well as are sure to change an oil phase to scrubs.SOLUTION: In a transparent or translucent liquid cosmetic in which oily scrub particles consisting of a liquid oily substance that is liquid at room temperature and a solid oily substance that is solid at room temperature are dispersed in an external water phase, the mass ratio of the liquid oily substance and the solid oily substance is prepared in the range of 1: (0.05-10) to obtain a transparent or translucent liquid cosmetic containing 60% by mass or more of hydrocarbon oil in the liquid oily substance and 60% by mass or more of a higher alcohol in the solid oily substance.SELECTED DRAWING: None

Description

  The present invention relates to a liquid cosmetic composition, and more particularly to a liquid cosmetic composition in which oily scrub particles are dispersed in an outer water phase to show a transparent or translucent state, and a method for producing the same.

  As general transparent or translucent liquid cosmetics, lotion, beauty essence, all-in-one gel, shampoo, etc. are known, but they have a uniform appearance due to the stability over time and the manufacturing method, and an oil solution. The compounding amount of the oil agent is low because the external appearance becomes white when the compounding amount of is increased.

  On the other hand, in order to produce an excellent feeling of use as a cosmetic, it is necessary to enhance the blending of the oil agent, and further, a cosmetic that intentionally makes the appearance non-uniform to obtain an aesthetic appearance is required. Two-layer type cosmetics in which the phases are completely separated and cosmetics containing solid oil scrub are known.

  However, the two-layer type cosmetics require a labor for separately filling the water phase and the oil phase when filling the container, or a special machine capable of filling while stirring, and further, at a low temperature. In order to avoid solidification when the oil phase falls below the melting point, there are a small number of types of oil agents that can be selected, so that there is a drawback that it is not possible to sufficiently deal with improving the feeling of use.

  In addition, when solid oil scrub is blended into cosmetics, it is generally practiced to scrub the solid oil in advance and then blend it, which makes the color and size of the scrub particles uniform. It is difficult to manufacture various products, and when an oil agent having a high melting point is used as a material for scrub, the oil agent is difficult to melt at body temperature when a cosmetic is applied, and the usability is impaired.

  In order to eliminate these drawbacks and to provide a cosmetic that has both excellent product aesthetics and usability, a semisolid oily substance obtained by mixing a liquid oily substance and a solid oily substance is heated and dissolved in a warm water-soluble solution. It is known that the spherically scrubbed oily component is dispersed by pouring into the thickening agent phase with stirring and further cooling while stirring (Patent Document 1).

JP-A-4-346909

  However, in the conventional method described above, it is not possible to arbitrarily mix the liquid oily substance and the solid oily substance, and depending on the type of the selected oil agent, the oil phase is not spherically scrubbed, or the aqueous phase becomes cloudy during production. In that case, a step of once collecting the obtained spherical scrub, washing it, and then throwing it into another aqueous phase is required. Even if the spherical scrub can be manufactured, the spherical scrub may be collapsed or adhered and aggregated due to vibration during use or transportation.

  As described above, the conventional cosmetics containing spherical scrubs are not easy to produce so that the oil phase is certainly scrubbed, and the obtained cosmetics have excellent product aesthetics and usability. At the same time, it was difficult to ensure stability against vibration.

  Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a cosmetic in which spherical oily scrubs are dispersed, which has a high moisturizing property without a sticky feeling in a use state, and has an excellent product aesthetics and a feeling of use. In addition, the scrub has vibration stability and can be manufactured so that the oil phase is scrubbed surely.

  In order to solve the above problems, the inventors of the present application have earnestly studied cosmetics having a characteristic appearance by dispersing an oily substance without emulsifying, and as a result, the main constitution of the liquid oily substance Stable and highly uniform spheres by using hydrocarbon oil as the oil agent, limiting the main oil agent of the solid oily substance to higher alcohols, and keeping the mixing ratio of the liquid oily substance and the solid oily substance within a predetermined range. The inventors have found that an oily scrub can be obtained, and that the scrub has vibration stability, so that the quality is stable and that the cosmetic can satisfy the feeling of use, and has completed the present invention.

That is, in the present invention, in order to solve the above-mentioned problems, oily scrub particles composed of a mixture (A) of a liquid oily substance (B) which is liquid at room temperature and a solid oily substance (C) which is solid at room temperature are external water. In a transparent or translucent liquid cosmetic that is dispersed in the phase,
The mixture (A) is a mixture of a liquid oily substance (B): solid oily substance (C) = 1: (0.05 to 10) in a mass ratio,
The liquid oily substance (B) contains at least 60 mass% of hydrocarbon oil,
The solid oily substance (C) is a liquid cosmetic characterized by containing 60% by mass or more of a higher alcohol having 14 or more carbon atoms.
In addition, the above-mentioned room temperature is a temperature range of 1 to 30 ° C. determined by the Japanese Pharmacopoeia.

As the above-mentioned hydrocarbon oil, it is preferable to use one or more kinds of hydrocarbon oil selected from squalane, α-olefin oligomer and liquid paraffin.
The solid oily substance is preferably one or more solid oily substances selected from cetanol, behenyl alcohol, hydrogenated rapeseed oil alcohol and stearyl alcohol.

  The liquid cosmetic according to the present invention configured as described above comprises a main constituent oil agent of a liquid oily substance and a solid oily substance which are components constituting oily scrub particles, and is composed of a predetermined amount of hydrocarbon oil and higher alcohol, In addition, since the mixing ratio of the liquid oily substance and the solid oily substance is set to a predetermined ratio, the oily scrub particles have a proper size and are uniform in size, and there is little variation in particle size distribution, and a liquid cosmetic composition is uniformly dispersed. Therefore, it has an excellent product aesthetic that a homogeneous property is actually felt, and even a transparent or translucent cosmetic can be blended with a relatively large amount of an oil agent, which has an excellent usability and further has an oily scrub particle. However, it is a cosmetic with excellent vibration stability and quality stability that can withstand long-term distribution and storage.

  In order to provide a cosmetic that more reliably exhibits the above-described excellent characteristics, it is preferable to use a cosmetic in which 0.3 to 5.0% by mass of oily scrub particles are mixed in 100% by mass of the cosmetic.

  Furthermore, in order to more reliably provide the above-described excellent characteristics, a cosmetic in which the average particle size of the oily scrub particles dispersed in the outer water phase is 0.2 to 2.0 mm, Preferably.

  Furthermore, in order to produce a cosmetic material that more reliably exhibits the above-mentioned excellent characteristics, a mixture (A) of a liquid oily substance (B) which is liquid at room temperature and a solid oily substance (C) which is solid at room temperature is mixed with 60 Heated to -80 ° C to dissolve, then put into an aqueous phase heated to 60 to 80 ° C, stirred to spheroidize the mixture (A), and then cooled to uniformly disperse the oily scrub particles in the external aqueous phase. It is preferable to provide a method for producing a liquid cosmetic which comprises a step of obtaining a dispersed transparent or translucent liquid cosmetic, and which satisfies the requirements for the compounding ingredients (A), (B) and (C) described above.

  At the time of stirring, it is preferable to use a mixer, a disperser, a kneader, a homomixer, a pressure homogenizer or a high-speed stirrer so as to make the particle diameter uniform.

  This invention is a liquid cosmetic in which oily scrub particles consisting of a predetermined mixture are dispersed in the outer aqueous phase, and since the components and the blending ratio of the liquid oily substance and the solid oily substance of the mixture are adjusted to be within a predetermined range, It has an excellent product aesthetic by dispersing spherical scrubs of appropriate size, and it has an excellent feeling of use by blending a large amount of oil agent despite the fact that it is a transparent cosmetic. And has the advantage of being a cosmetic having excellent quality stability.

  Further, the production method of the present invention has an advantage that a cosmetic having the above-mentioned excellent characteristics can be efficiently produced with stable quality.

Drawing-substituting photographs showing the transparent containers of Example 4 and Example 5 each filled with the lotion side by side. Drawing-substituting photographs showing the transparent containers in Comparative Examples 6 and 7 which are filled with the lotions, respectively, arranged side by side. A micrograph, as a substitute for a drawing, showing the oily scrub particles in the lotion of Example 15. A micrograph, as a substitute for a drawing, showing the oily scrub particles in the lotion of Example 16.

  The liquid cosmetic of the embodiment of the present invention is a liquid at room temperature and is a "liquid oily substance (B) containing 60% by mass or more of hydrocarbon oil" and a solid at room temperature "60 higher alcohols having 14 or more carbon atoms. A transparent or semi-transparent liquid cosmetic in which oily scrub particles consisting of a "mixture (A)" containing "a solid oily substance (C) contained in an amount of at least mass% in a predetermined ratio" are dispersed in an external water phase.

  The liquid oily substance (B) in the present invention is a liquid at room temperature, for example, 25 ° C, and is a hydrocarbon harmless to the skin, ethers, esters, higher alcohols, fatty acids, which are harmless to the skin, which are mixed in ordinary cosmetics. Vegetable oils and silicone oils can be preferably used.

  Specific examples of such liquid oily substances include hydrocarbons such as liquid paraffin, α-olefin oligomer and squalane. Examples of ethers include dioctyl ether, ethylene glycol monolauryl ether, ethylene glycol dioctyl ether and glycerol monooleyl ether, and examples of esters include glyceryl tri-2-ethylhexanoate, cetyl 2-ethylhexanoate, isononanoic acid. Isononyl, isotridecyl isononanoate, isopropyl myristate, butyl myristate, octyldodecyl myristate, isopropyl palmitate, ethyl stearate, octyl palmitate, isocetyl isostearate, butyl stearate, ethyl linoleate, isopropyl linoleate, ethyl oleate , Isocetyl myristate, isostearyl myristate, isostearyl palmitate, cetyl palmitate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, cetyl caprylate, decyl laurate, hexyl laurate, decyl myristate , Myristyl myristate, cetyl myristate, stearyl stearate, decyl oleate, cetyl ricinoleate, isostearyl laurate, isotridecyl myristate, octyl stearate, isocetyl stearate, isodecyl oleate, isopropyl isostearate, 2-ethylhexane Acid cetostearyl, 2-ethylhexanoic acid stearyl, hexyl isostearate, glyceryl tricaprylate, glyceryl triundecylate, glyceryl triisopalmitate, glyceryl triisostearate, isostearyl octanoate, octyl isononanoate, hexyldecyl neodecanoate, neodecanoic acid Examples include octyldodecyl, isostearyl isostearate, and octyldodecyl isostearate. Examples of higher alcohols include lauryl alcohol, oleyl alcohol and isostearyl alcohol, and examples of fatty acids include oleic acid and isostearic acid. Examples of vegetable oils include olive oil, soybean oil and jojoba oil, and examples of silicone oils include methylpolysiloxane, methylphenylpolysiloxane and methylcyclopolysiloxane.

In the liquid oily substance (B) in the present invention, the proportion of the hydrocarbon oil is 60% by mass or more (60 to 100% by mass).
Hydrocarbon oil is a well-known liquid compound composed of carbon and hydrogen, and can be applied to those that are harmless to the skin, which are usually added to cosmetics.
If the blending amount of the hydrocarbon oil is less than 60% by mass, the scrub tends to disintegrate, scrubs having an average particle size of less than 0.2 mm or extremely smaller than that are generated, and the outer water phase becomes cloudy. The reason is that it is difficult to reliably achieve both excellent product aesthetics and excellent usability of cosmetics, such as strong stickiness derived from an oil agent other than a hydrocarbon oil and easy deterioration of usability.

  The solid oily substance (C) in the present invention is a wax which is solid at, for example, 40 ° C. or lower and is harmless to the skin and has a melting point of 40 ° C. or higher which can be blended into cosmetics, so that it is solid when it comes into contact with human skin. Fatty acids, higher alcohols, ethers, esters and the like can be preferably used.

  Specific examples of the solid oily substance include waxes such as carnauba wax, candelilla wax, rice bran wax, lanolin and beeswax, and fatty acids as lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, hydroxy. Examples thereof include stearic acid. Further, higher alcohols include cetanol, stearyl alcohol, behenyl alcohol, hydrogenated rapeseed oil alcohol, aralkyl alcohol, and the like, ethers include batyl alcohol, chimyl alcohol, and the like, and as esters, myristic acid Examples thereof include myristyl, cetyl myristate, cetyl palmitate, stearyl stearate, pentaerythritol tetramyristate, cetyl lactate, and cholesteryl stearate.

  Further, the liquid cosmetic of the present invention may be added with a surfactant if necessary, for example, polyoxyethylene behenyl ether, polyethylene glycol monostearate, polyoxyethylene cetyl ether, polyglyceryl monostearate, mono Sorbitan stearate, polyglyceryl monolaurate, polyglyceryl diisostearate, polyglyceryl distearate, sodium lauroyl glutamate, behentrimonium chloride, stearamidopropyldimethylamine and the like may be added.

  The proportion of higher alcohols in the solid oily substance (C) in the present invention is 60% by mass or more (60 to 100% by mass). Among the compounds represented by the general formula R-OH (R: aliphatic residue), the higher alcohols have 14 or more carbon atoms, and those which are harmless to the skin and are usually added to cosmetics are preferred. Can be used for. Incidentally, the melting point of the higher alcohol having 14 carbon atoms is about 38 ° C.

  If the blending amount of the solid oily substance in the present invention is less than 60% by mass, the scrub tends to collapse, or conversely, the scrub becomes sticky, so that it collapses or adheres and agglomerates due to vibration during use or transportation. This is because the stickiness derived from an oil agent other than the higher alcohol is strong and the usability is impaired, and it is difficult to surely achieve both good cosmetic aesthetics and excellent usability.

Further, the mixing ratio of the liquid oily substance (B) and the solid oily substance (C) of the mixture (A) in the present invention is in the range of (B) :( C) = 1: (0.05-10) by mass ratio. Is.
This is because when the mass ratio (B) :( C) of the solid oily substance (C) to the liquid oily substance (B) is less than 1: 0.05, the melting point of the oily scrub particles becomes low, and the liquid scrub particles remain in a liquid state after being produced. If the mass ratio exceeds 1:10, the melting point of the oily scrub particles will be high, and the scrub will remain on the skin as a solid substance that the scrub will not melt at body temperature during use, resulting in a feeling of use. This is because it is difficult to surely maintain both good cosmetic aesthetics and good usability such as damage.

  Further, in the cosmetic material to be adjusted in the present invention, it is preferable that the total amount of the oily scrub particles is 0.3 to 5.0 mass% in the cosmetic material. Because, if the blending amount is less than 0.3% by mass, the emollient feeling at the time of use is not sufficient and the desired usability is not satisfied, and if the blending amount is more than 5.0% by mass, the stickiness is strong and it is intended. It is not possible to satisfy the feeling of use, and because the scrub is too much to disperse properly, and the product aesthetics is impaired, it is possible to ensure that both the excellent product aesthetics of cosmetics and the excellent usability are maintained. Because it is difficult.

  Furthermore, in the cosmetic material to be adjusted in the present invention, it is preferable that the average particle diameter of the oily scrub particles dispersed in the outer water phase is 0.2 to 2.0 mm. Because, when the average particle size is less than 0.2 mm, extremely small scrubs are likely to be generated and the outer water phase tends to be turbid, and when the average particle size is greater than 2.0 mm, the scrub is difficult to use. This is because it does not melt at body temperature, impairing the feeling of use, and it is difficult to control the particle size during production, resulting in reduced production efficiency.

  Furthermore, the cosmetics to be adjusted in the present invention can be produced by using an apparatus generally used for producing cosmetics, but in the stirring step, a mixer, a disperser, a kneader, a homomixer, a pressure homogenizer or a high speed mixer. It is preferable to make the particle diameter of the oily scrub particles uniform by mixing the oily scrub particles and the aqueous phase using a stirrer, more specifically, a composite stirrer, a thin film swirl type high speed mixer, or the like.

  For example, a thin film swirl type high speed mixer is one in which a thin film liquid layer is formed on the inner wall surface of a cylindrical container that swirls at high speed by centrifugal force, and stirring, mixing and dispersion are performed therein. The peripheral velocity of the liquid layer on the inner wall surface is 0.5 to 5.0 m / s, and the residence time required for stirring and mixing in the thin film is 15 to 60 seconds. It is possible to form a group of oily scrub particles having a narrow range and a small variation in particle size.

  Such stirring / mixing / dispersion can be achieved by using a commercially available thin film swirl type high-speed mixer (Filmix manufactured by Primix Co., Ltd.), and if the particle size of the oily scrub particles is made uniform, a liquid cosmetic product is obtained. Not only does it have a better appearance, but the quality is stable and the usability is reduced.

  The uniformization of the particle diameter of the oily scrub particles is performed by adjusting the variation (standard deviation) of the particle diameters in the range of 0.10 to 0.20 mm when the average particle diameter of the oily scrub particles is 0.2 to 2.0 mm ( In Examples 15 and 16 described later, the intended effect of 0.18 mm and 0.13 mm) is obtained.

  The components of the external water phase of the cosmetics prepared in the present invention are not particularly limited, but it is preferable to select them appropriately depending on the cosmetics to be blended. The method for adjusting the cosmetic of the present invention is not particularly limited, and can be appropriately selected according to the cosmetic to be blended.

[Examples 1 to 3, Comparative Examples 1 to 4]
The components (B) and (C) shown in Table 1 were mixed, and the mixture was heated to 60 to 80 ° C to dissolve it, and then heated to a temperature within the range of the dissolved 60 to 80 ° C (B). By adding the liquid mixture to an aqueous phase consisting of components other than the component (C) and cooling with stirring at a rotation speed of 100 to 500 rpm using a stirrer (Tokyo Rika Kikai Co., Ltd .: Magella NZ-1100), A lotion was prepared by uniformly dispersing oily scrub particles having an average particle diameter of about 0.8 mm.
With respect to the obtained lotion, the product aesthetics and the feeling of use immediately after the production and after the vibration test were judged by the following evaluation methods.

(Evaluation method) (Product aesthetics-immediately after production)
Immediately after production, the lotion was filled in a transparent container (manufactured by Takemoto Container Co., Ltd .: OPT-100) and allowed to stand still, and the particle size, shape, color, etc. of the oil droplets were visually observed.

[Judgment]
⊚: The product has a very good appearance. (The size and shape of the oil droplets are appropriate, uniform, and properly dispersed)
◯: The product has an excellent appearance. (Slight variations in particle size and shape of oil droplets)
B: Poor product appearance. (The particle size and shape of the oil droplets are inadequate, and the oil phase that cannot be dispersed remains.)
X: Very unfavorable product appearance. (Oil phase is not dispersed)

(Evaluation method) (Product aesthetics-after vibration test)
After filling the resulting lotion into a transparent container and visually observing the particle size, shape, color, etc. of the oil drops, vibrate the container and visually check the particle size, shape, color, etc. of the oil drops after vibration. Comparative observation was carried out. Vibration of the container was carried out by repeating the operation of returning the container to its original position after inclining 180 degrees repeatedly 30 times in an environment of a temperature of 23 to 27 ° C. and a humidity of 40 to 60%.

[Judgment]
⊚: Product aesthetics are not impaired even after vibration. (Product appearance does not change after vibration)
◯: Product aesthetics are hardly impaired even after vibration. (Oil drops become slightly smaller due to vibration, or the water phase becomes slightly cloudy)
Δ: The product appearance is impaired after vibration. (Oil drops become very small due to vibration, and the water phase becomes cloudy)
X: The appearance of the product is completely impaired after vibration. (Oil drops disappear due to vibration, resulting in a uniform and cloudy appearance)

[Evaluation method] (Usage)
Evaluation panel 20 people (10 adults and 10 people each in their 20s to 40s) evaluated the feeling of use (stickiness etc.) when applied to the skin in 5 levels according to the following criteria, and judged from the average score. did.

[Evaluation]
5 points: Very good.
4 points: Good.
3 points: Normal.
2 points: Bad.
1 point: Very bad.

[Judgment]
◎: Average score of 4 points or more ○: Average score of 3 points or more and less than 4 points △: Average score of 2 points or more and less than 3 points ×: Average point of less than 2 points

  As is clear from the results shown in Table 1, in Examples 1 and 2, since the hydrocarbon oil was used as the liquid oily substance (B), lotions having excellent product aesthetics and feeling of use were obtained. It was

  On the other hand, in Comparative Examples 1 and 2, ester oils and fatty acids are used as the liquid oily substance (B ′), so that the particles are easily broken and the lotion is obtained by the stirring step in which the particles are made finer than necessary. Was given. These products were unable to maintain the product aesthetics because the particles were further miniaturized by the vibration test.

  In Comparative Example 3, silicone oil was used as the liquid oily substance (B ′), and the compatibility with the solid oily substance (C) was poor, so that the liquid oily substance (B ′) and the solid oily substance were not mixed during the production process. The substance (C) was separated, and uniform spherical oily scrub particles could not be formed. Further, when the obtained lotion was filled in a transparent container, the silicone oil adhered to the wall surface of the container, and it was difficult to take out the silicone oil from the container during use.

Further, Comparative Example 4 is a lotion obtained by the composition intermediate between Example 1 and Comparative Example 1, and like the Comparative Example 1, the particles were easily finely divided and did not have an excellent product aesthetics. ..
In the lotion of Example 3 in which the ratio of hydrocarbon oil in the liquid oily substance (B) was further increased from Comparative Example 4, the particles were difficult to be refined to some extent, and the product specifications were not impaired in the vibration test.

[Examples 4-5, Comparative Examples 5-9]
A lotion was prepared in exactly the same manner as in Example 1 except that the components having the composition shown in Table 2 were used, and the cosmetic appearance and use immediately after production and after vibration test were performed using the evaluation methods described above and below. The feeling and average particle size were evaluated. Regarding the product aesthetics of Example 4, Example 5, Comparative Example 6, and Comparative Example 7 immediately after production, photographs of transparent containers filled with lotion are shown in FIG. 1 or FIG.

(Evaluation method) (Average particle size)
The obtained cosmetics were observed with a microscope (VHX-6000 (manufactured by Keyence Corporation)), and the obtained images were processed by a built-in system (main measurement system) to calculate the average particle size.

  As is clear from the results shown in Table 2, the lotion of Example 4 used behenyl alcohol having 22 carbon atoms as the solid oily substance (C), and had an excellent product aesthetics and feeling of use. .. That is, in the lotion of Example 4 filled in the transparent container shown on the left side of the photograph in FIG. 1, oil droplets were dispersed uniformly in an appropriate size, and the external water phase was also transparent and had a beautiful appearance. ..

  On the other hand, the lotion of Comparative Example 5 uses waxes as the solid oily substance (C ′), and the particles have a stickiness peculiar to waxes, and the particles adhere to each other during the manufacturing process or in the vibration test. As a result, the aesthetics of the product was impaired, and the product was extremely sticky in the feeling of use.

  Further, in Comparative Examples 6-8, when a fatty acid, an ester oil, and a hydrophilic surfactant were used alone as the solid oily substance (C ′), respectively, a predetermined amount of higher alcohol having 14 or more carbon atoms was not contained. Therefore, the particles are likely to be broken, the particles are easily miniaturized in the manufacturing process or the vibration test, the oily scrub particles having a desired particle size are not dispersed, and a lotion having a good product appearance cannot be obtained.

The lotions of Comparative Example 6 (left side of the same photograph) and Comparative Example 7 (right side of the same photograph) filled in the transparent container shown in the photograph of FIG. 2 have an oily scrub having a too small particle size and a small particle size. Due to the excess, the whole lotion became cloudy and the product aesthetics was impaired.
Further, Comparative Example 9 is a lotion obtained with a composition intermediate between Example 4 and Comparative Example 6, but like the Comparative Example 6, the particles are likely to be finely divided and are expected to have transparency. The product did not have the aesthetic appeal.

  Further, in Example 5, the ratio of the higher alcohol having a carbon number of 14 or more contained in the solid oily substance (C) is increased from that of Comparative Example 9, the particles are difficult to be refined to some extent, and the appearance of the product is impaired even in the vibration test. It was a lotion. That is, in the lotion of Example 5 filled in the transparent container shown on the right side of the photograph in FIG. 1, oil droplets were dispersed uniformly in an appropriate size, and the external water phase was also transparent and had a beautiful appearance. ..

[Examples 6 to 10 and Comparative Examples 10 to 11]
A lotion was prepared in exactly the same manner as in Example 1 except that the components having the compositions shown in Table 3 were used, and the aesthetics of the product immediately after the production and after the vibration test and the feeling of use were determined using the above-described evaluation method. ..

  As is clear from the results shown in Table 3, in Examples 7-9, the mass ratio of the liquid oily substance (B) and the solid oily substance (C) was 1: (0.10 to 5.0). Oily scrub particles consisting of a mixture within the range were dispersed, and a lotion having excellent product aesthetics and feeling of use was obtained.

Further, in the lotion of Example 6 in which the mass ratio was 1: 0.05, the hardness of the solid oil was not easily imparted to the particles, so the particles were slightly fined by the vibration test. There was no problem.
Further, in Comparative Example 10 in which the solid oily substance ratio was further reduced from that in Example 6, the grain refinement in the vibration test became remarkable, and the product aesthetics could not be maintained.

In the lotion of Example 10 in which the mass ratio was 1:10, the melting point of the oily scrub particles was high, and it took a long time to dissolve at the time of application, but it was usable.
In Comparative Example 11 in which the ratio of the solid oily substance (C) was further increased from Example 10, the particles did not dissolve during use and the feeling of use was impaired, and at normal manufacturing temperatures, oily scrub particles were less likely to be present during the stirring and dispersing process. The part solidified and became a lotion with an unpleasant aesthetic appearance.

[Examples 1, 11 to 14, Comparative Examples 12 to 13]
A lotion was prepared in exactly the same manner as in Example 1 except that the components having the compositions shown in Table 4 were used, and the aesthetics of the product immediately after the production and after the vibration test and the feeling of use were determined using the above-described evaluation method. .. For reference, Example 1 is also shown in the table.

  As is clear from the results shown in Table 4, as the content of the oily scrub particles, [(B) + (C)] was blended in an amount of 0.5 to 1.0% by mass in 100% by mass of the cosmetic material. The lotions of Examples 12, 13 and Example 1 had excellent product aesthetics and feeling of use.

The lotion of Example 11 in which the mixing ratio of the oily scrub particles was 0.3% by mass had a slightly weak feeling of use due to the oily substance.
In Comparative Example 12 in which the mixing ratio of the oily scrub particles was smaller than that in Example 11, almost no sticky feeling due to the oily substance was felt, and the use feeling was not so preferable.

Example 14 in which the mixing ratio of the oily scrub particles is 5.0% by mass has a feeling of use with an appropriate greasy feel due to the oily substance, and the density of oil droplets in the lotion is high, and the lotion has a good product appearance. Met.
In Comparative Example 13 in which the mixing ratio of the oily scrub particles was increased from that in Example 14, the sticky feeling due to the oily substance became too strong, the use feeling was impaired, and the oil droplets could not be dispersed appropriately.

[Examples 15 to 16]
In Example 15, a lotion was prepared in exactly the same manner as in Example 1 except that the components shown in Table 5 were used. In Example 16, the components shown in Table 5 were used and the thin film swirling was performed as a high-speed stirrer. Example 1 exactly the same as in Example 1 except that the peripheral speed was 0.5 to 1.0 m / s and the residence time in the stirrer was 20 to 30 seconds using a mold high-speed mixer (Filmix). As a result, a lotion containing 9 samples (3 lots of 3 lots) was prepared for each example.

  Then, using the evaluation methods described above and below, the product aesthetics and the feeling of use immediately after the production and after the vibration test were examined, and the average particle diameter was measured in the same manner as in Example 4, and the dispersion of the particle diameters was evaluated by the following evaluation methods. Was evaluated and judged. Further, micrographs showing the morphology of the oily scrub particles in the lotion of Examples 15 and 16 are shown in FIGS. 3 and 4.

[Evaluation method] (Dispersion of particle size)
Average lotion by observing the lotion obtained by manufacturing 3 lots with the same composition with a microscope (VHX-6000 manufactured by Keyence) and processing the obtained image with the built-in system (main measurement system) The standard deviation was calculated as the diameter and its variation. Furthermore, the evaluation panel 20 persons (10 adult males and females in their 20s to 40s each) evaluated the feeling of use (such as sticky feeling) when applied to the skin to determine the variation between lots.

[Judgment]
⊚: There is almost no variation in particle size and feeling between lots.
◯: There is slight variation in particle size between lots, but there is almost no effect on usability.
Δ: The particle size varies greatly among lots, which also affects the feeling of use.
X: The particle size varies greatly among lots, and the feeling of use also differs.

  As is clear from the results shown in Table 5, the lotion of Example 15 in which the thin film swirl type high-speed mixer was not used in the stirring step had an average particle size of 0.46 mm and a variation in particle size (standard deviation was about 0.18 mm) was slight. In addition, as is clear from the micrograph of FIG. 3, the lotion of Example 15 had large variations in particle size and small distorted particles were formed.

The lotion of Example 16 using a thin film swirl type high speed mixer had an average particle diameter of 0.47 mm and almost no variation in particle diameter (standard deviation of about 0.13 mm). Further, as is clear from the micrograph of FIG. 4, the lotion of Example 16 had a relatively small variation in particle size, and formation of distorted particles was not observed.
Formulation examples (compositions) of various cosmetics that can be produced similarly to the embodiment of the present invention are summarized in Table 6 below.

Claims (7)

A transparent or translucent liquid cosmetic in which oily scrub particles consisting of a mixture (A) of a liquid oily substance (B) which is liquid at room temperature and a solid oily substance (C) which is solid at room temperature are dispersed in an outer water phase,
The mixture (A) is a mixture of a liquid oily substance (B): solid oily substance (C) = 1: (0.05 to 10) in a mass ratio,
The liquid oily substance (B) contains at least 60 mass% of hydrocarbon oil,
A liquid cosmetic, wherein the solid oily substance (C) contains 60% by mass or more of a higher alcohol having 14 or more carbon atoms.   The liquid cosmetic according to claim 1, wherein the content of the oily scrub particles in 100% by mass of the liquid cosmetic is 0.3 to 5.0% by mass.   The liquid cosmetic according to claim 1, wherein the oily scrub particles are oily scrub particles having an average particle diameter of 0.2 to 2.0 mm.   2. The liquid cosmetic according to claim 1, wherein the hydrocarbon oil is one or more kinds of hydrocarbon oil selected from squalane, α-olefin oligomer and liquid paraffin.   The liquid cosmetic according to claim 1, wherein the solid oily substance is one or more solid oily substances selected from cetanol, behenyl alcohol, hydrogenated rapeseed oil alcohol, and stearyl alcohol. A mixture (A) of a liquid oily substance (B) which is liquid at room temperature and a solid oily substance (C) which is solid at room temperature is heated to 60 to 80 ° C. to be dissolved, and then added to an aqueous phase heated to 60 to 80 ° C. Then, the mixture (A) is spheroidized by stirring and then cooled to obtain a transparent or translucent liquid cosmetic in which the oily scrub particles are uniformly dispersed in the outer water phase.
The mixture (A) is a mixture of a liquid oily substance (B): solid oily substance (C) = 1: (0.05 to 10) in a mass ratio,
The liquid oily substance (B) contains 60 mass% or more of hydrocarbon oil,
The method for producing a liquid cosmetic, wherein the solid oily substance (C) contains 60% by mass or more of a higher alcohol having 14 or more carbon atoms.   The method for producing a liquid cosmetic according to claim 6, wherein the stirring is stirring for homogenizing the particle diameter using a mixer, a disperser, a kneader, a homomixer, a pressure homogenizer or a high-speed stirrer.