JPH09315941A - Method for producing solid powder cosmetics - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a method for producing a solid powder cosmetic containing a cosmetic powder obtained by mixing powder and an oil phase component, a coarse powder and an oil phase component are charged into a mixer. Then, after the mixing is completed, a fine powder is added and mixed, and the powder and the oil phase component are uniformly dispersed and mixed, and a method for producing a solid powder cosmetic containing cosmetic powder. By the production method of the present invention, it is possible to obtain a solid powder cosmetic having a simple structure, a short time, a uniform molded product surface, no caking, excellent impact resistance and a good feeling in use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a solid powder cosmetic containing a cosmetic powder obtained by mixing powder and an oil phase component. The present invention also relates to a method for producing a solid powder cosmetic which can be uniformly dispersed in a short time, has no caking (a phenomenon in which the surface of a molded article is locally solidified), has excellent impact resistance, and has a good feeling in use.

[0002]

2. Description of the Prior Art Used mainly for make-up, which is composed mainly of powder and contains an oil phase component containing solid oil and / or liquid oil and is filled in a container such as a medium plate by press molding or casting. Such cosmetics are generally called solid powder cosmetics. In producing such a solid powder cosmetic, one or more powder components which are main components are gently mixed in advance with a rocking mixer or the like, and then an oil phase component containing solid oil and / or liquid oil is added. The steps of mixing, crushing and mixing, and then compression molding are adopted. Examples of the method include a method of mixing by a stirring action such as a V-type mixer, a ribbon mixer, a Nauter mixer, and a Henschel mixer, and then crushing with an impact crusher such as a hammer mill and a pin mill, a ball mill, and a mill. A method using a crusher such as a crusher that also serves as a mixer is known (Japanese Patent Laid-Open No. 4-894).
No. 22, JP-A-7-2624).

[0003]

However, as described above, after previously mixing one or more powder components which are the main components, the oil phase components including the solid oil and / or the liquid oil are mixed,
In the manufacturing method according to the usual method such as crushing and mixing and then compression molding, due to the tendency toward high functionality such as foundation,
It has become difficult to obtain an optimum and uniform mixed state of the powder component and the oil phase component. In particular, due to the tendency of the powder component to become finer, the fine powder component is likely to aggregate during the mixing step, and the fine powder and / or the oil phase component is likely to be localized.
Such localization causes caking, which impairs the aesthetics of the surface of the molded product such as foundation, makes it difficult to peel off to a cosmetic tool such as a puff, and has a drawback in that the usability is also deteriorated. Further, if the powder component and the oil phase component are non-uniform, the strength of the molded product is locally reduced, and the molded product is liable to be broken when dropped, that is, the impact resistance is reduced. In order to eliminate such localization, generally, a method of prolonging the mixing time in the mixing step or enhancing the shearing effect of the mixer can be considered. However, prolonging the mixing time hinders productivity, and mixing for a long time affects the usability, and the usability according to the designed function cannot be obtained. There is a drawback that it will be a large scale. In addition, when the average particle size of the fine powder component contained in the foundation or the like is 1 μm or less and the compounding amount is 5% by weight or more,
Depending on the conditions, there is a drawback that it is difficult to eliminate localization by the above-mentioned conventional method.

Therefore, an object of the present invention is to provide a solid powder containing a uniformly dispersed cosmetic powder in which localization of the powder component and / or the oil phase component is difficult to occur in a short time by a simple operation. It is to provide a manufacturing method of cosmetics.

[0005]

Means for Solving the Problems In producing a solid powder cosmetic containing a cosmetic powder obtained by mixing powder and an oil phase component, the present inventors have prepared one or more powders. The coarse powder containing the body and the oil phase component containing one or more kinds of oil agents are charged into a mixer, and after the mixing is completed, the fine powder containing one or more kinds of powder is added. As a result of the present invention, they have surprisingly found that a solid powder cosmetic containing a cosmetic powder in which a powder and an oil phase component are uniformly dispersed and mixed can be produced, and the present invention has been completed.

That is, the gist of the present invention is (1) a method for producing a solid powder cosmetic containing a cosmetic powder obtained by mixing powder and an oil phase component, in which a crude powder and an oil phase component are mixed. A method for producing a solid powder cosmetic containing cosmetic powder, which comprises charging into a mixer and, after mixing, adding and mixing fine powder, and uniformly dispersing and mixing the powder and the oil phase component, ( 2) The production method according to (1) above, wherein the coarse powder has an average particle diameter of 1 to 300 μm, and the fine powder has an average particle diameter of 0.001 to 50 μm. Amount is 50
To 95% by weight, a fine powder content of 1 to 30% by weight, and an oil phase component content of 3 to 25% by weight, the production method according to (1) or (2) above, (4) Any of the above (1) to (3), characterized in that a coarse powder containing a cosmetic pigment, a fine powder containing a cosmetic pigment, and an oil phase component containing a cosmetic oil agent are used. In the manufacturing method described in (5), the step of mixing the coarse powder and the oil phase component and / or the step of adding and mixing the fine powder, the viscosity of the oil phase component is adjusted to 5 by setting the mixing temperature to 40 to 100 ° C. To 1000 centipoise, and mixing, The manufacturing method in any one of said (1)-(4) characterized by the above-mentioned.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The present invention is a method for producing a solid powder cosmetic containing a cosmetic powder obtained by mixing a powder and an oil phase component, charging a coarse powder and an oil phase component into a mixer, and after mixing, The production method is characterized in that the fine powder is added and mixed, and the powder and the oil phase component are uniformly dispersed and mixed. First, a coarse powder containing one or more powders and an oil phase component containing one or more oil agents are charged into a mixer such as a Henschel mixer, and mixing is started. The mixer used here is not particularly limited, and in addition to the above-mentioned Henschel mixer, a V-type mixer, a ribbon mixer, a Nauter mixer, a high speed mixer, etc. can be used as well. Before performing this mixing, the coarse powder itself is gently mixed beforehand with a mixer such as a rocking mixer, or after gently mixing and crushed and mixed with a crusher such as a hammer mill or a pin mill, premixing is performed. It is more effective in terms of coagulation and crushing of powder. Further, it is effective to mix the oil phase component in advance, and further heating it to 40 to 100 ° C. is more effective because the viscosity is lowered and the dispersibility is improved.

The end point of mixing the coarse powder and the oil phase component is determined as described below. The uniformity of the mixture of the coarse powder and the oil phase component is evaluated as a mixing degree M defined below by measuring the change in color due to mixing. _{M = | (A t -A 0} ) / (A∞-A 0) | A t: any time colorimetric values A _0: Initial value A∞: saturated color measurement value (maximum value) A colorimetric light There is no limitation as long as the value can express the color of light. One way to represent color is the CIE (International Commission on Illumination) 1931 standard color system, which represents measured colors by xy chromaticity coordinates. Other methods of displaying colors include an RGB color system, a USC color system, a Munsell color system, and a Lab color system, but any method may be used. A∞ is a colorimetric value after mixing for a sufficiently long time. A ∞ is measured beforehand by a preliminary test. When the degree of mixing is 0.7 or more, preferably 0.8 or more, more preferably 0.9 or more, it can be judged that the mixing is substantially uniform, and the mixing is completed. This is determined according to the degree of mixing at the end of the addition and mixing of the fine powder, which will be described later.

Next, after completion of the mixing, fine powder containing one or more powders is added and mixed. The operation of mixing the coarse powder and the oil phase component and the addition and mixing of the fine powder may be continuously performed. As a result, the fine powder is dispersed on the surface of the coarse powder particles,
It is possible to easily obtain a uniformly mixed cosmetic powder in a short time. Before adding the fine powder, gently mix the fine powder beforehand with a mixer such as a rocking mixer, or after gently mixing and pulverizing and mixing with a pulverizer such as a hammer mill or a pin mill, the agglomeration of the powder will be resolved. It is more effective in terms of crushing. The obtained cosmetic powder can be compression-molded by a known method such as press molding or cast molding to obtain a solid powder cosmetic. As a result, it is possible to obtain a solid powder cosmetic having a powder and an oil phase component uniformly dispersed in a short time, having no caking, and having excellent impact resistance and a good feeling in use.

For the addition and mixing of the fine powder, the same evaluation as that of the mixing degree M described above is performed to determine the final mixing end point.
The final mixing degree and the caking specific surface area of the molded product have a correlation as shown in FIG. 1, and the caking specific surface area is 6.0.
%, That is, when the mixing degree M is 0.7 or more, preferably 0.8 or more, more preferably 0.9 or more, it can be determined that the mixture is substantially uniform, and the addition and mixing of the fine powder is completed. If the uniformity increases, the caking on the surface of the molded product tends to decrease, and a good product having a specific surface area of the caking of less than 6.0% with a mixing degree of 0.7% or more is obtained. When the degree of mixing is 0.8 or more, a product having a specific surface area of caking of less than 2.0% is obtained, and as a more preferable condition, the specific surface area of caking is less than 1.0% when the degree of mixing is 0.9 or more. Further, strictly speaking, the composition of the powder is different between the mixing of the coarse powder and the oil phase component and the addition and mixing of the fine powder, and therefore it is preferable to measure A ∞ separately. However, there is no particular problem even if A ∞ of mixing the coarse powder and the oil phase component is applied to the addition and mixing of the fine powder.

As the coarse powder and the fine powder used in the present invention, those containing a cosmetic pigment are preferably used. The coarse powder and the fine powder are not particularly limited as long as they are used as a general cosmetic, and one kind or a mixture of two or more kinds can be used. For example, as a pigment for cosmetics, talc, mica, sericite, kaolin, bentonite, silica, alumina, magnesium carbonate, barium sulfate, cobalt blue, ultramarine blue, dark blue, manganese violet, titanium-coated mica, bismuth oxychloride, iron oxide (yellow, (Red, black), magnesium oxide, zinc oxide, titanium oxide, zirconium oxide, boron nitride, magnesium aluminate silicate, inorganic pigments such as aluminum powder, acrylic resin, polyester resin, fluororesin, polyethylene resin, red No. 202, red 204 No., red 226,
Organic pigments such as yellow No. 401 and blue No. 404 are listed. Furthermore, biopolymers such as keratin powder, collagen powder, silk powder, cellulose powder, chitosan powder and the like can be mentioned. Further, it is also possible to use a powder in which these pigments are combined. Furthermore, the surface of the above-mentioned powder may be treated with metal soap, silicone, perfluoroalkyl, lecithin, or the like.

The average particle size of the coarse powder is preferably 1 to 300 μm, more preferably 5 to 100 μm, particularly preferably 5 to 50 μm, and most preferably 5 to 20 μm.
If the average particle size is less than 1 μm, the mixing with the oil phase component may not be sufficiently uniform in a short time. If the average particle size exceeds 300 μm, the feeling of use during application to the skin becomes rough and it may not be suitable as a raw material for cosmetics. The average particle size of the fine powder is 0.001 to 50 μm.
m is preferable, more preferably 0.01 to 20 μm,
It is particularly preferably 0.05 to 5 μm. If the average particle size is less than 0.001 μm, it tends to be powdery when applied to the skin and it is difficult to obtain a desirable finish.
If it exceeds 0 μm, it tends to be difficult to cope with the high functionality of cosmetics such as the ultraviolet shielding effect and the feeling of use. The average particle size of the coarse powder is preferably larger than that of the fine powder. This is because when the average particle size is large, the number of particles inevitably decreases, and it becomes easy to mix with the oil phase component before adding the fine powder, and it is easy to uniformly disperse the oil phase component in a short time. . The average particle size in this specification was measured using a Microtrac, HRA (× 100) type, manufactured by Nikkiso Co., Ltd.

The oil phase component used in the present invention is not particularly limited as long as it contains a cosmetic oil agent used in ordinary cosmetics, such as solid oil, liquid oil and semi-solid oil.
One kind or a mixture of two or more kinds can be used. For example, solid fat (wax), hardened oil, liquid paraffin, squalene, squalane, petrolatum, polyisobutylene,
Examples thereof include isopropyl myristate, glyceryl monostearate, coconut oil fatty acid triglyceride, stearyl alcohol, hexadecyl alcohol, palmitic acid, lauric acid, stearic acid, and silicone oil.

The amount of the coarse powder used in the present invention is not particularly limited as long as a desired cosmetic can be obtained, but preferably 50 to 95% by weight of the obtained solid powder cosmetic, and more preferably. The amount is 60 to 95% by weight, more preferably 70 to 95% by weight, and particularly preferably 80 to 95% by weight. If the content of the coarse powder is less than 50% by weight,
The cosmetic powder becomes bulky, the molding load at the time of molding becomes high, and the molding machine becomes large-scale. If it exceeds 95% by weight, the impact resistance of the molded product is reduced. The amount of the fine powder is not particularly limited as long as the desired cosmetic can be obtained, but is preferably 1 to 30% by weight, more preferably 1 to 20% by weight, and particularly preferably 1 to 15% by weight.
It is. If the content of the fine powder is less than 1% by weight, the impact resistance of the molded product will be reduced. If it exceeds 30% by weight, the cosmetic powder becomes bulky and the molding load at the time of molding becomes high, so that the molding machine becomes bulky. The blending amount of the oil phase component is not particularly limited as long as a desired cosmetic can be obtained, but is preferably 3 to 25% by weight, more preferably 4 to 20% by weight, and particularly preferably 5 to It is 15% by weight. When the blending amount of the oil phase component is less than 3% by weight, the oil phase component as a binder at the time of molding is insufficient and the strength of the molded product decreases. If it exceeds 25% by weight, the oil phase component becomes excessive and the dry feeling is lost, resulting in a sticky feeling.

In the step of mixing the coarse powder and the oil phase component and / or the step of adding and mixing the fine powder, the outer wall of the mixer is heated or heated by a method such as blowing heated air, The mixing temperature is preferably 40 to 100 ° C, more preferably 50 to 80 ° C. The mixing temperature at this time is the temperature of the coarse powder, the fine powder, and the oil phase component at the time of stirring and mixing, and the viscosity of the oil phase component is adjusted to 5 to 1000 centipoise when mixing in this temperature range. Is preferred. If the viscosity is below 5 centipoise,
There is no particular problem with the dispersion of the oil phase itself. However, even if the temperature of the product is lowered to room temperature, the viscosity of the oil phase is not sufficiently increased, the strength of the molded product is lowered, and the molded product is easily cracked. If it exceeds 1000 centipoise, it becomes difficult to uniformly disperse the oil phase during mixing, and it becomes difficult to stick to a makeup tool such as a puff, and the feeling of use deteriorates and the product becomes sticky. The viscosity can be measured with a DB viscometer described in JIS K-7117 Annex Viscometer. Usually, when heated or heated to 40 ° C. or higher, the solid oil melts, and other liquid oils and semi-solid oils are more easily dispersed due to the decrease in the viscosity of the oil phase component. On the other hand, if the temperature exceeds 100 ° C., the oil phase component may deteriorate, which may cause an offensive odor.

The homogeneity is evaluated as the degree of mixing M defined below, in the same manner as described above for the change in color due to mixing. _{M = | (A t -A 0} ) / (A∞-A 0) | A t: any time colorimetric values A _0: Initial value A∞: saturated color measurement value (maximum value) A colorimetric light There is no limitation as long as the value can express the color of light. One way to represent color is the CIE (International Commission on Illumination) 1931 standard color system, which represents measured colors by xy chromaticity coordinates. Other methods of displaying colors include an RGB color system, a USC color system, a Munsell color system, and a Lab color system, but any method may be used. A∞ is a colorimetric value after mixing for a sufficiently long time. A∞ is measured in advance. The mixing degree and the caking specific surface area of the molded product have a correlation as shown in FIG. 1, and the mixing degree M is 0.7 or more, preferably 0.8.
As described above, more preferably 0.9 or more, it can be determined that the particles are substantially uniform. If the degree of homogeneity increases, the caking on the surface of the molded article tends to decrease, and when the mixing degree is 0.7 or more, a specific product with a specific surface area of caking of less than 6.0% is obtained.
When the mixing degree is 0.8 or more, a product having a caking specific surface area of less than 2.0% can be obtained more stably, and a more preferable condition is that the caking specific surface area is less than 1.0% at a mixing degree of 0.9 or more. Become.

In the method for producing a solid powder cosmetic of the present invention,
Further, if necessary, a surfactant, an antiseptic, an antioxidant, a fragrance, a moisturizer, a bactericide, an ultraviolet absorber and the like may be added. The method for producing a solid powder cosmetic of the present invention can be applied to, for example, powder foundation, eyeshadow, teak color, face powder and the like.

[0018]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1 Ingredients A and D listed in Table 1 were roughly mixed with a rocking mixer and then treated with a hammer mill to give ingredients A and D.
A mixed powder of This mixed powder was used as a coarse powder. The obtained crude powder was put into a Henschel mixer, and at the same time as the mixing was started, the oil phase component of component B preheated to 75 ° C. was added. The stirring blade has a peripheral speed of 41 m / s and the mixing temperature is constant at 60 ° C, and the mixture is stirred for 5 minutes. After the mixing is completed, Component C is charged into the Henschel mixer as fine powder, and the stirring blade has a peripheral speed of 41 m / s and the mixing temperature is constant at 60 ° C. And mixed for 30 seconds. Then, the mixture was processed by a hammer mill to obtain a mixed powder. This mixed powder has a diameter of 5c
An appropriate amount was placed on a metal plate of m and compression molded at 35 kgf / cm ² , to obtain a solid powder foundation.

[0020]

[Table 1]

In Table 1, the hardened oil is Syncrowax HRC (made by Croda Japan Co., Ltd.), the ultraviolet absorber is 2-ethylhexyl paramethoxycinnamate, and the preservative is paraoxybenzoate.

Example 2 Ingredients A and C shown in Table 1 were obtained by roughly mixing the ingredients A and C in a rocking mixer and then treating with a hammer mill.
The mixed powder of was used as a coarse powder. The obtained crude powder was put into a Henschel mixer, and at the same time as the mixing was started, the oil phase component of component B preheated to 75 ° C. was added. The peripheral speed of the stirring blade is 4
After stirring at 1 m / s and a mixing temperature of 60 ° C. for 5 minutes and mixing, Component D is charged as a fine powder into a Henschel mixer, and the peripheral speed of the stirring blade is 41 m / s, and the mixing temperature of 60 ° C. is 3
Mix for 0 seconds. Other operations were performed in the same manner as in Example 1.

Example 3 By the procedure of Example 1, after the coarse powder and the oil phase components were mixed by stirring for 5 minutes, Component C was charged as fine powder into the Henschel mixer while the operation of the apparatus was continued, and the circumference of the stirring blade was changed. Speed 41m / s,
The mixing temperature was kept constant at 60 ° C., and mixing was continued for 30 seconds. Other operations are the same.

Example 4 By the procedure of Example 1, the coarse powder and the oil phase component were stirred for 5 minutes and after mixing was completed, Component C was charged as a fine powder into a Henschel mixer, and the peripheral speed of the stirring blade was 41 m / s, The mixing temperature was kept constant at 60 ° C., and mixing was continued for 10 seconds. Other operations are the same.

Comparative Example 1 Component A and all powder components of component C and component D were put into a rocking mixer to form a mixed powder, which was put into a Henschel mixer and preheated to 75 ° C. simultaneously with the start of mixing. The oil phase component of component B was added. The peripheral speed of the stirring blade is 4
The mixture was stirred and mixed for 5 minutes and 30 seconds at 1 m / s and a constant mixing temperature of 60 ° C. Then, the mixture was processed by a hammer mill to obtain a mixed powder.
Take an appropriate amount of this mixed powder in a gold plate with a diameter of 5 cm, and weigh 35 kg.
A solid powder foundation was obtained by compression molding at f / cm ² .

Comparative Example 2 The stirring and mixing time of the Henschel mixer of Comparative Example 1 was 17 minutes, and the other operations were the same as those of Comparative Example 1.

Comparative Example 3 The stirring and mixing time of the Henschel mixer of Comparative Example 1 was set to 30 minutes, and other operations were the same as those of Comparative Example 1.

Evaluation Method Further , for each of the Examples and Comparative Examples, the three items of surface uniformity of molded products, impact resistance and feeling of use were evaluated. The uniformity of the surface of the molded product is a constant load of 22 g on the puff.
After rubbing the surface of the molded product 50 times with f / cm ² , the specific surface area of the caking part of the surface with respect to the test surface was calculated by an image analysis device (manufactured by Nireco, Luzex III). Was evaluated. The smaller the specific surface area of the caking, the more uniform the surface of the molding surface. Impact resistance was evaluated by a drop test.
That is, the molded product set in the container was naturally dropped from a height of 50 cm to a lauan material having a thickness of 2 cm, and the number of drops until cracks were observed was measured. The feeling of use was tested by a specialized panelist, and the adhesion to the skin during application, the adhesiveness, and the feel were evaluated as shown in Table 3.

[0029]

[Table 2]

[0030]

[Table 3]

Mixing degree measurement In advance, as a preliminary test, the change with time of the mixing degree by the mixing operation was measured. First, a colored pigment (red iron oxide, black iron oxide, yellow iron oxide) is replaced with a white pigment (talc). A blending amount of 0.035% by weight is dissolved in the oil phase component using a lipophilic dye, ZUDAN RED (manufactured by Wako Pure Chemical Industries, Ltd.) as a tracer. Mixing of these is started, sampling is performed every arbitrary time, and the color development value is measured by a colorimeter (CR-300 manufactured by Minolta). The mixing degree M was determined from these data and the following equation. _{M = | (a t -a 0} ) / (a∞-a 0) | where a _t is an arbitrary time colorimetric values, a ₀ is the initial value, A∞ is saturated colorimetric value (maximum value), It represents the a value in Lab notation. From the results of the measurement of the degree of mixing by this preliminary test, the mixing conditions for obtaining the desired degree of mixing were determined, and were reproduced in each of the examples and comparative examples. Further, in this preliminary test, the operation of mixing until the a value becomes constant, that is, the operation of measuring the a ∞ by sufficiently lengthening the mixing time is also performed. In addition, in Examples 1 to 4, the change in the mixing degree with time was measured for the mixing before the addition of the fine powder. Since the amount of the fine powder was very small, there was almost no change in the hue after the addition, and as shown in Example 4, it was confirmed that the powder was substantially uniformly dispersed even after stirring and mixing for 10 seconds after the addition of the fine powder. It depends.

[0032] Results Examples 1 to 4 and Table 4 Evaluation results for Comparative Examples 1 to 3
Summarized in

[0033]

[Table 4]

As shown in Table 4, in Examples 1 to 4, solid powder cosmetics having almost no caking, excellent impact resistance and good feeling in use were obtained, but in Comparative Examples 1 to 3, caking was obtained. Was observed, and impact resistance and usability were inferior.

[0035]

According to the production method of the present invention, it is possible to obtain a solid powder cosmetic having a simple structure, a short time, a uniform molded product surface, no caking, excellent impact resistance and a good feeling in use.

[Brief description of drawings]

FIG. 1 is a correlation diagram between the degree of mixing and the specific surface area of caking of a molded article.

Claims (5)

[Claims] 1. A method for producing a solid powder cosmetic containing a cosmetic powder obtained by mixing powder and an oil phase component,
A solid containing a cosmetic powder characterized in that the coarse powder and the oil phase component are put into a mixer, and after the mixing is finished, the fine powder is added and mixed to uniformly disperse and mix the powder and the oil phase component. Method for manufacturing powder cosmetics. 2. The production method according to claim 1, wherein the average particle diameter of the coarse powder is 1 to 300 μm, and the average particle diameter of the fine powder is 0.001 to 50 μm. 3. The content of the coarse powder is 50 to 95% by weight, the content of the fine powder is 1 to 30% by weight, and the content of the oil phase component is 3 to 25% by weight. The manufacturing method according to claim 1. 4. A coarse powder containing a cosmetic pigment, a fine powder containing a cosmetic pigment, and an oil phase component containing a cosmetic oil agent are used. Manufacturing method. 5. A step of mixing a coarse powder and an oil phase component and / or
Alternatively, in the step of adding and mixing the fine powder, the mixing temperature is set to 4
By adjusting the temperature to 0 to 100 ° C., the viscosity of the oil phase component is adjusted to 5 to 5.
The manufacturing method according to any one of claims 1 to 4, wherein the mixing is performed at 1000 centipoise.