JP7365030B2 - liquid cosmetics - Google Patents

Description

The present invention relates to a liquid cosmetic composition, and more particularly to a liquid cosmetic composition in which oil-based scrub particles are dispersed in an external aqueous phase and exhibits a transparent or translucent state, and a method for producing the same.

Commonly known transparent or translucent liquid cosmetics include lotions, serums, all-in-one gels, and shampoos, but these have a uniform appearance due to stability over time and restrictions on manufacturing methods, and oil-based If the amount of oil added is increased, the appearance becomes white, so the amount of oil added is low.

On the other hand, in order to create an excellent feeling when used as a cosmetic, it is necessary to increase the blend of oil agents, and there is a need for cosmetics that have an intentionally uneven appearance to achieve a beautiful appearance. Two-layer cosmetics with completely separated phases and cosmetics containing solid oil scrubs are known.

However, when filling two-layer cosmetics into containers, it is necessary to fill the aqueous phase and oil phase separately, or a special machine that can be filled while stirring is required, and furthermore, it requires a special machine that can be filled while stirring. In order to avoid solidification when the oil phase falls below the melting point, there are only a few types of oil agents that can be selected, and therefore, there is a drawback that it is not possible to sufficiently improve the feeling of use.

Furthermore, when blending solid oil scrubs into cosmetics, it is common practice to first form the solid oil into a scrub before blending, but in this case, the color and size of the scrub particles become uniform. It is difficult to manufacture a wide variety of products, and when a high-melting oil is used as a material for a scrub, the oil is difficult to melt at body temperature when cosmetics are applied, which impairs the feeling of use.

In order to eliminate these drawbacks and create a cosmetic that has both excellent product aesthetics and usability, a semi-solid oil-based substance that is a mixture of a liquid oil-based substance and a solid oil-based substance is heated and dissolved, and then a heated water-based solution is prepared. It is known that an oily component formed into a spherical scrub is dispersed by adding it to a thickener phase while stirring and cooling it while stirring (Patent Document 1).

Japanese Patent Application Publication No. 4-346909

However, with the above conventional methods, it is not possible to mix liquid oily substances and solid oily substances arbitrarily, and depending on the type of oily agent selected, the oil phase may not be scrubbed into spherical shapes, or the aqueous phase may become cloudy during production. In that case, it is necessary to once collect the obtained spherical scrub, wash it, and then introduce it into another aqueous phase. Furthermore, even if a spherical scrub can be manufactured, the spherical scrub may collapse or become sticky and agglomerated due to vibration during use or transportation.

In this way, it is difficult to manufacture cosmetics containing conventional spherical scrubs in such a way that the oil phase is reliably converted into a scrub, and it is also difficult to ensure that the resulting cosmetics have excellent product aesthetics and usability. At the same time, it was difficult to ensure stability against vibration.

Therefore, the object of this invention is to solve the above-mentioned problems and provide a cosmetic product in which spherical oil-based scrubs are dispersed, which does not have a sticky feeling when used, has high moisturizing properties, and has an excellent product appearance and feel. In addition, the scrub has vibration stability and can be manufactured so that the oil phase is reliably scrubbed.

In order to solve the above problems, the inventors of the present application have conducted intensive research on cosmetics that have a distinctive appearance by dispersing oily substances without emulsifying them. By using hydrocarbon oil as the oil agent, limiting the main constituent oil agent of the solid oil substance to higher alcohol, and keeping the mixing ratio of liquid oil substance and solid oil substance within a predetermined range, a stable and highly uniform spherical shape can be formed. They discovered that it is possible to obtain an oil-based scrub, and that the scrub has vibration stability, resulting in a cosmetic product that is stable in quality and provides a satisfying feeling of use, leading to the completion of this invention.

That is, in this invention, in order to solve the above-mentioned problem, oil-based scrub particles made of a mixture (A) of a liquid oily substance (B) that is liquid at room temperature and a solid oily substance (C) that is solid at room temperature are used in outdoor water. In transparent or translucent liquid cosmetics dispersed in a phase,
The mixture (A) is a mixture in a mass ratio of liquid oily substance (B): solid oily substance (C) = 1: (0.05 to 10),
The liquid oily substance (B) contains 60% by mass or more of hydrocarbon oil,
The liquid cosmetic is characterized in that the solid oily substance (C) contains 60% by mass or more of a higher alcohol having 14 or more carbon atoms.
Note that the above-mentioned room temperature is a temperature range of 1 to 30° C. as defined by the Japanese Pharmacopoeia.

As the hydrocarbon oil, it is preferable to use one or more hydrocarbon oils selected from squalane, α-olefin oligomer, and liquid paraffin.
Further, 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 consists of a predetermined amount of a hydrocarbon oil and a higher alcohol as main components of a liquid oily substance and a solid oily substance, which are the components constituting the oily scrub particles. In addition, since the blending ratio of the liquid oily substance and the solid oily substance is set to a predetermined ratio, the oily scrub particle diameter is uniform to an appropriate size, there is little variation in the particle size distribution, and the liquid cosmetic is uniformly dispersed. As a result, the product has an excellent aesthetic appearance with a feeling of homogeneous properties, can contain a relatively large amount of oil even in transparent or translucent cosmetics, has an excellent feeling of use, and has oil-based scrub particles. However, it becomes a cosmetic with excellent vibration stability and quality stability that can withstand long-term distribution and storage.

In order to make a cosmetic that more reliably exhibits the above-mentioned excellent characteristics, it is preferable that the cosmetic contains oil-based scrub particles in an amount of 0.3 to 5.0% by mass based on 100% by mass of the cosmetic.

Furthermore, in order to make a cosmetic that more reliably exhibits the above-mentioned excellent characteristics, it is necessary to use a cosmetic in which the average particle diameter of the oil-based scrub particles dispersed in the external water phase is 0.2 to 2.0 mm. It is preferable to do so.

Furthermore, in order to produce a cosmetic that more reliably exhibits the above-mentioned excellent characteristics, a mixture (A) of a liquid oily substance (B) that is liquid at room temperature and a solid oily substance (C) that is solid at room temperature is mixed with 60% The mixture (A) is heated to ~80°C to dissolve it, then poured into the aqueous phase heated to 60~80°C, stirred to make the mixture (A) spheroidal, and then cooled to uniformly distribute the oil-based scrub particles in the outer aqueous phase. It is preferable that the method for producing a liquid cosmetic comprises a step of obtaining a dispersed transparent or translucent liquid cosmetic, and has the above-mentioned requirements for the ingredients (A), (B), and (C).

When stirring, it is preferable to use a mixer, a disperser, a kneader, a homomixer, a pressure homogenizer, or a high-speed stirrer to uniformize the particle size.

This invention is a liquid cosmetic in which oily scrub particles made of a predetermined mixture are dispersed in an external aqueous phase, and the components and blending ratio of the liquid oily substance and solid oily substance in the mixture are adjusted to a predetermined range. The product has an excellent appearance due to the dispersion of appropriately sized spherical scrubs, and although it is a transparent cosmetic, it has an excellent usability due to the inclusion of a large amount of oil, and the scrub has excellent vibration stability. It has the advantage of being a cosmetic with excellent quality stability.

Further, the production method of the present invention has the advantage that cosmetics exhibiting the above-mentioned excellent characteristics can be produced efficiently and with stable quality.

A photograph substituted for a drawing showing transparent containers filled with the lotions of Example 4 and Example 5 arranged side by side. A photograph substituted for a drawing showing transparent containers filled with the lotions of Comparative Example 6 and Comparative Example 7 arranged side by side. Microphotograph as a substitute for a drawing showing oily scrub particles in the lotion of Example 15 Microphotograph in place of a drawing showing oily scrub particles in the lotion of Example 16

The liquid cosmetic according to the embodiment of the present invention is liquid at room temperature and contains "liquid oily substance (B) containing 60% by mass or more of hydrocarbon oil" and solid at room temperature and contains "60% higher alcohol having 14 or more carbon atoms". This is a transparent or translucent liquid cosmetic in which oily scrub particles made of a "mixture (A) containing a solid oily substance (C) containing % by mass or more" in a predetermined ratio are dispersed in an external aqueous phase.

The liquid oily substance (B) in this invention is liquid at room temperature, for example, 25°C, and includes hydrocarbons, ethers, esters, higher alcohols, fatty acids, etc., which are harmless to the skin and are blended into ordinary cosmetics. Vegetable oils, silicone oils, etc. can be suitably used.

Specific examples of such liquid oily substances include liquid paraffin, α-olefin oligomer, squalane, and the like as hydrocarbons. In addition, 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, and 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 Cetostearyl acid, stearyl 2-ethylhexanoate, hexyl isostearate, glyceryl tricaprylate, glyceryl triundecylate, glyceryl triisopalmitate, glyceryl triisostearate, isostearyl octoate, octyl isononanoate, hexyldecyl neodecanoate, neodecanoic acid Examples include octyldodecyl, isostearyl isostearate, and octyldodecyl isostearate. In addition, examples of higher alcohols include lauryl alcohol, oleyl alcohol, and isostearyl alcohol, and examples of fatty acids include oleic acid and isostearic acid. In addition, 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 this invention, the proportion of hydrocarbon oil is 60% by mass or more (60 to 100% by mass).
Hydrocarbon oil is a well-known liquid compound consisting of carbon and hydrogen, and can be applied as a harmless substance to the skin that is included in ordinary cosmetics.
If the blending amount of hydrocarbon oil is less than 60% by mass, the scrub will tend to disintegrate, or a scrub with an average particle size of less than 0.2 mm or extremely smaller will be produced, and the outer aqueous phase will become cloudy. This is because it becomes difficult to reliably achieve both good product aesthetics and good feel in cosmetics, such as the strong stickiness derived from oils other than hydrocarbon oils, which tends to impair the feel of the product.

The solid oily substance (C) in this invention is a wax that is solid at a temperature of 40° C. or lower and is harmless to the skin and has a melting point of 40° C. or higher and can be incorporated into cosmetics, so that it is solid when it comes into contact with human skin. Fatty acids, higher alcohols, ethers, esters, etc. can be suitably used.

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

Furthermore, a surfactant may be added to the liquid cosmetic of the present invention if necessary, such as polyoxyethylene behenyl ether, polyethylene glycol monostearate, polyoxyethylene cetyl ether, polyglyceryl monostearate, Sorbitan stearate, polyglyceryl monolaurate, polyglyceryl diisostearate, polyglyceryl distearate, sodium lauroylglutamate, behentrimonium chloride, stearamidopropyl dimethylamine, and the like may be added.

In the solid oily substance (C) in this invention, the proportion of higher alcohols is 60% by mass or more (60 to 100% by mass). The above-mentioned higher alcohol is a compound represented by the general formula R-OH (R: aliphatic residue) having 14 or more carbon atoms, and is preferably one that is harmless to the skin and is blended into ordinary cosmetics. It can be used for. Incidentally, the melting point of a higher alcohol having 14 carbon atoms is about 38°C.

If the blending amount of the solid oily substance in this invention is less than 60% by mass, the scrub will tend to disintegrate, or conversely, the scrub will become sticky, resulting in collapse or adhesive agglomeration due to vibration during use or transportation. This is because the stickiness derived from oils other than higher alcohols may be strong and the feeling of use may be impaired, making it difficult for cosmetics to reliably achieve both excellent product appearance and excellent feeling of use.

Furthermore, the blending ratio of the liquid oily substance (B) and the solid oily substance (C) in the mixture (A) in this invention is in the range of (B):(C)=1:(0.05 to 10) in terms of mass ratio. It is.
This is because if 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 will be low, and they will remain in the liquid state after production. If the mass ratio exceeds 1:10, the melting point of the oil-based scrub particles will be high, and the scrub will remain on the skin as a solid substance that can be felt without melting at body temperature during use, giving a feeling of use. This is because it is difficult to reliably maintain both an excellent product appearance and an excellent feeling of use in cosmetics.

Further, in the cosmetic prepared in the present invention, it is preferable that the total amount of oily scrub particles contained in the cosmetic is 0.3 to 5.0% by mass. This is because if the amount is less than 0.3% by mass, the emollient feeling during use will not be sufficient and the desired feeling of use will not be satisfied, and if the amount is more than 5.0% by mass, the stickiness will be strong and the desired feeling It is difficult to reliably maintain both the excellent product appearance and the excellent feel of cosmetics due to the unsatisfactory feel of the product and the fact that too much scrubbing is not able to properly disperse the product, which impairs the beauty of the product. This is because it is difficult.

Furthermore, in the cosmetic prepared in the present invention, it is preferable that the average particle diameter of the oily scrub particles dispersed in the external aqueous phase is 0.2 to 2.0 mm. This is because, with a small average particle diameter of less than 0.2 mm, extremely small scrubs are likely to be generated, causing turbidity in the external water phase, and with large average particle diameters of over 2.0 mm, it is difficult to scrub during use. This is because they do not dissolve at body temperature, impairing the feel of use, and because it is difficult to control the particle size during production, production efficiency decreases.

Furthermore, the cosmetic prepared in the present invention can be manufactured using equipment generally used for manufacturing cosmetics, but in the stirring process, a mixer, a disperser, a kneader, a homomixer, a pressure homogenizer, or a high-speed homogenizer can be used. It is preferable to mix 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 to make the particle size of the oily scrub particles uniform.

For example, a thin-film swirling high-speed mixer uses centrifugal force to form a thin film-like liquid layer on the inner wall surface of a cylindrical container that rotates at high speed, and agitation, mixing, and dispersion are performed inside the layer. By setting the peripheral speed of the liquid layer on the inner wall surface to 0.5 to 5.0 m/s and the residence time required for stirring and mixing within the thin film to 15 to 60 seconds, the particle size distribution can be adjusted to an average particle diameter of about 0.8 mm. It is possible to form a group of oily scrub particles with a narrow range and small variation in particle size.

Such stirring, mixing, and dispersion can be achieved using a commercially available thin-film rotating high-speed mixer (Filmix, manufactured by Primix), and when the particle size of the oil-based scrub particles is made uniform, liquid cosmetic products can be achieved. Not only will the aesthetic appearance be better, but the quality will be more stable and there will be less variation in the usability.

To make the particle diameter of oil-based scrub particles uniform, when the average particle diameter of oil-based scrub particles is 0.2 to 2.0 mm, the dispersion (standard deviation) of the particle diameter is reduced to a range of 0.10 to 0.20 mm ( In Examples 15 and 16, which will be described later, the desired effect was obtained with the thicknesses of 0.18 mm and 0.13 mm, respectively.

The components of the external aqueous phase of the cosmetic prepared in the present invention are not particularly limited, but are preferably appropriately selected depending on the cosmetic to be blended. Further, the method for preparing the cosmetic of the present invention is not particularly limited, and can be appropriately selected depending on the cosmetic to be blended.

[Examples 1 to 3, Comparative Examples 1 to 4]
Components (B) and (C) shown in Table 1 were mixed, the mixture was heated to 60 to 80°C to dissolve it, and then heated to the temperature within the range of 60 to 80°C at which the melted (B) By pouring the liquid mixture into an aqueous phase consisting of components other than component (C) and cooling while stirring at a rotation speed of 100 to 500 rpm using a stirrer (manufactured by Tokyo Rikakikai Co., Ltd.: Magella NZ-1100), A lotion was prepared in which oil-based scrub particles having an average particle diameter of about 0.8 mm were uniformly dispersed.
The resulting lotion was evaluated for product aesthetic appearance and feel in use immediately after production and after a vibration test using the following evaluation methods.

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

[judgement]
◎: The product has very good aesthetic appearance. (The particle size and shape of the oil droplets are appropriate, uniform, and properly dispersed.)
○: Excellent product appearance. (There is slight variation in the particle size and shape of the oil droplets.)
△: The product has an unfavorable aesthetic appearance. (The particle size and shape of the oil droplets are inappropriate, and an undispersed oil phase remains.)
×: The product has a very unfavorable aesthetic appearance. (Oil phase is not dispersed)

[Evaluation method] (Product aesthetics - after vibration test)
Fill a transparent container with the obtained lotion, visually observe the particle size, shape, color, etc. of the oil droplets, then vibrate the container and visually observe the particle size, shape, color, etc. of the oil droplets after vibration. I made a comparative observation. The container was vibrated by repeating the operation of inverting the container 180 degrees and returning it to its original position 30 times in an environment with a temperature of 23 to 27° C. and a humidity of 40 to 60%.

[judgement]
◎: Product appearance is not impaired at all even after vibration. (Product appearance does not change even after vibration)
○: Product appearance is hardly impaired even after vibration. (Oil droplets become slightly smaller due to vibration, and water phase becomes slightly cloudy)
△: Product appearance is impaired after vibration. (Oil droplets become very small due to vibration, and the water phase becomes cloudy)
×: Product appearance is completely damaged after vibration. (Oil droplets become invisible due to vibration, resulting in a uniform, cloudy appearance)

[Evaluation method] (Feeling of use)
An evaluation panel of 20 people (10 male and female adults in their 20s to 40s) evaluated the feeling of use (stickiness, etc.) when applied to the skin using the following criteria, and then judged based on the average score. did.

[evaluation]
5 points: Very good.
4 points: Good.
3 points: Average.
2 points: Bad.
1 point: Very poor.

[judgement]
◎: 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 score of less than 2 points

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

On the other hand, in Comparative Examples 1 and 2, ester oil or fatty acid was used as the liquid oily substance (B'), which made the particles easy to collapse, and the stirring process resulted in a lotion with finer particles than necessary. It was done. These products were unable to maintain the aesthetic appearance of the product because the particles were further refined by the vibration test.

In addition, in Comparative Example 3, silicone oil was used as the liquid oily substance (B'), and since the compatibility with the solid oily substance (C) was poor, the liquid oily substance (B') was mixed with the solid oily substance during the manufacturing process. Substance (C) separated and could not form uniform spherical oil scrub particles. Furthermore, when the obtained lotion was filled into a transparent container, the silicone oil adhered to the wall of the container, making it difficult to remove the silicone oil from the container during use.

In addition, Comparative Example 4 was a lotion obtained with a composition intermediate between Example 1 and Comparative Example 1, and like Comparative Example 1, the particles were easily made fine and did not have an excellent product appearance. .
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 made fine 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 for using the ingredients with the composition shown in Table 2. Using the evaluation methods described above and below, the appearance of the product immediately after manufacture and after the vibration test was evaluated. The texture and average particle size were evaluated. Moreover, regarding the product appearance of Example 4, Example 5, Comparative Example 6, and Comparative Example 7 immediately after manufacture, photographs of transparent containers filled with lotion are shown in FIG. 1 or FIG. 2, respectively.

[Evaluation method] (Average particle diameter)
The obtained cosmetic was observed with a microscope (VHX-6000 (manufactured by Keyence Corporation)), and the average particle diameter was calculated by processing the obtained image with a built-in system (main measurement system).

As is clear from the results shown in Table 2, the lotion of Example 4 used behenyl alcohol with a carbon number of 22 as the solid oily substance (C), and had an excellent product appearance 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, the oil droplets were uniformly dispersed with 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 are given a stickiness unique to waxes, and the particles do not adhere to each other during the manufacturing process or vibration test. The aesthetic appearance of the product was impaired, and the feeling of stickiness during use was also very strong.

Furthermore, in Comparative Example 6-8, when a fatty acid, an ester oil, and a hydrophilic surfactant were used alone as the solid oily substance (C'), a predetermined amount of higher alcohol having 14 or more carbon atoms was not included. Therefore, the particles tend to crumble and become finer during the manufacturing process or vibration test, and the oil-based scrub particles of the desired particle size were not dispersed, making it impossible to obtain a lotion with a desirable product appearance.

The lotions of Comparative Example 6 (left side of the same photo) and Comparative Example 7 (right side of the same photo) filled in the transparent containers shown in the photo in Figure 2 have oil-based scrub particles that are too small, and the particle size is too small. The entire lotion became cloudy due to the effects of overuse, and the beauty of the product was impaired.
In addition, Comparative Example 9 is a lotion obtained with an intermediate composition between Example 4 and Comparative Example 6, but like Comparative Example 6, the particles tend to be made finer and it has the desired transparency. The product did not have the same aesthetic appearance.

In addition, in Example 5, the ratio of higher alcohol with carbon number of 14 or more contained in the solid oily substance (C) was increased from Comparative Example 9, and the particles were difficult to be refined to some extent, and even in the vibration test, the product appearance was impaired. It was a lotion that didn't come off. That is, in the lotion of Example 5, which was filled in the transparent container shown on the right side of the photograph in FIG. 1, the oil droplets were uniformly dispersed in an appropriate size, and the external aqueous phase was also transparent, giving it a beautiful appearance. .

[Examples 6 to 10, Comparative Examples 10 to 11]
A lotion was prepared in exactly the same manner as in Example 1, except for using the ingredients with the composition shown in Table 3, and the product aesthetics and feeling of use were evaluated using the evaluation method described above immediately after manufacture and after the vibration test. .

As is clear from the results shown in Table 3, in Example 7-9, the mass ratio of liquid oily substance (B) to solid oily substance (C) was 1: (0.10 to 5.0). Oil-based scrub particles consisting of a mixture within the range were dispersed, and a lotion with excellent product appearance and feel was obtained.

In addition, in the lotion of Example 6 with the above mass ratio of 1:0.05, the particles were slightly refined in the vibration test because the hardness of the solid oil was difficult to impart to the particles, but the feeling of use was There were no problems.
Furthermore, in Comparative Example 10, in which the ratio of solid oily substances was further lowered from Example 6, particle refinement in the vibration test became remarkable, making it impossible to maintain the aesthetic appearance of the product.

The lotion of Example 10 in which the mass ratio was 1:10 had a high melting point of the oil-based scrub particles and took a long time to dissolve upon application, but 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, one oily scrub particle was removed during the stirring and dispersion process. The lotion partially solidified, resulting in an undesirable aesthetic appearance.

[Examples 1, 11-14, Comparative Examples 12-13]
A lotion was prepared in exactly the same manner as in Example 1, except for using the ingredients with the composition shown in Table 4, and the product aesthetics and feeling of use were evaluated immediately after manufacture and after the vibration test using the evaluation method described above. . For reference, Example 1 is also listed in the same table.

As is clear from the results shown in Table 4, the content of oil-based scrub particles was 0.5 to 1.0% by mass of [(B) + (C)] in 100% by mass of the cosmetic. The lotions of Examples 12 and 13 and Example 1 had excellent product appearance and feel.

The lotion of Example 11 in which the blending ratio of oily scrub particles was 0.3% by mass had a slightly less sticky feeling due to the oily substance.
Comparative Example 12, in which the blending ratio of oily scrub particles was smaller than that of Example 11, had a less desirable feel in use, with almost no sticky feeling due to the oily substance.

Example 14, in which the blending ratio of oil-based scrub particles was 5.0% by mass, had a moderately sticky feeling due to the oil-based substance, and the density of oil droplets in the lotion was high, resulting in a good product appearance. Met.
In Comparative Example 13, in which the blending ratio of oil-based scrub particles was increased from Example 14, the stickiness caused by the oil-based substance was too strong, impairing the feeling of use, and the oil droplets could not be dispersed appropriately.

[Examples 15-16]
In Example 15, a lotion was prepared in exactly the same manner as in Example 1 except that the ingredients shown in Table 5 were used, and in Example 16, the ingredients shown in Table 5 were used and a thin film swirl was used as a high-speed stirrer. The manufacturing conditions were exactly the same as in Example 1, except that a high-speed mixer (Filmix, manufactured by Primix) was used at a circumferential speed of 0.5 to 1.0 m/s and a residence time in the stirrer of 20 to 30 seconds. Nine samples (three lots, three lots) of lotion were prepared for each example.

Then, using the evaluation methods described above and below, the aesthetic appearance and feel of the product immediately after manufacture and after the vibration test were examined, and the average particle diameter was determined in the same manner as in Example 4, and the variation in particle diameter was determined using the evaluation method described below. was evaluated and determined. Furthermore, micrographs showing the morphology of oily scrub particles in the lotions of Examples 15 and 16 are shown in FIGS. 3 and 4.

[Evaluation method] (Variation in particle size)
The lotion obtained by manufacturing 3 lots of the same composition was observed with a microscope (Keyence Corporation: VHX-6000), and the obtained image was processed by the built-in system (main measurement system) to determine the average particle size. The standard deviation was calculated as the diameter and its dispersion. Furthermore, 20 evaluation panelists (10 male and female adults between the ages of 20 and 40) evaluated the feeling of use (stickiness, etc.) when applied to the skin to determine the variation between lots.

[judgement]
◎: There is almost no variation in particle size and feel during use between lots.
○: There is slight variation in particle size between lots, but there is almost no effect on the feeling of use.
Δ: There is a large variation in particle size between lots, which also affects the feeling of use.
×: There is a very large variation in particle size between lots, and the usability is also different.

As is clear from the results shown in Table 5, the lotion of Example 15, which did not use a thin-film swirl type high-speed mixer in the stirring process, had an average particle diameter of 0.46 mm and a variation in particle diameter (standard deviation was approximately 0.18 mm) was small .

The lotion of Example 16 using a thin-film swirl type high-speed mixer had an average particle size of 0.47 mm, and there was almost no variation in particle size (standard deviation was about 0.13 mm). Furthermore, as is clear from the micrograph in FIG. 4, the lotion of Example 16 had relatively small variations in particle diameter, and no irregularly shaped particles were observed.
Formulation examples (compositions) of various cosmetics that can be produced in the same manner as the embodiments of this invention are summarized in Table 6 below.

Claims (6)

A transparent or translucent liquid cosmetic in which oily scrub particles consisting of a mixture (A) of a liquid oily substance (B) that is liquid at room temperature and a solid oily substance (C) that is solid at room temperature are dispersed in an external aqueous phase,
The mixture (A) is a mixture in a mass ratio of liquid oily substance (B): solid oily substance (C) = 1: (0.05 to 10),
The liquid oily substance (B) contains 60% by mass or more of hydrocarbon oil,
The solid oily substance (C) contains 60% by mass or more of a higher alcohol having a carbon number of 14 or more , and the oily scrub particles have an average particle diameter of 0.2 to 2.0 mm. liquid cosmetics. The liquid cosmetic according to claim 1, wherein the content of the oil-based scrub particles in 100% by mass of the liquid cosmetic is 0.3 to 5.0% by mass. 2. The liquid cosmetic according to claim 1, wherein the hydrocarbon oil is one or more hydrocarbon oils 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) that is liquid at room temperature and a solid oily substance (C) that is solid at room temperature is heated to 60 to 80°C to dissolve it, and then poured into an aqueous phase heated to 60 to 80°C. The mixture (A) is spheroidized by stirring, and then cooled to produce a transparent or translucent liquid cosmetic in which oily scrub particles with an average particle diameter of 0.2 to 2.0 mm are uniformly dispersed in the external aqueous phase. Consists of the process of obtaining
The mixture (A) is a mixture in a mass ratio of liquid oily substance (B): solid oily substance (C) = 1: (0.05 to 10),
The liquid oily substance (B) contains 60% by mass or more of hydrocarbon oil,
A method for producing a liquid cosmetic in which the solid oily substance (C) contains 60% by mass or more of a higher alcohol having 14 or more carbon atoms. 6. The method for producing a liquid cosmetic according to claim 5 , wherein the stirring is performed by using a mixer, a disperser, a kneader, a homomixer, a pressure homogenizer, or a high-speed stirrer to make the particle size uniform.