JP7435967B2 - solid powder cosmetics - Google Patents

Description

The present invention relates to a solid powder cosmetic containing an environmentally compatible spherical composite powder for cosmetics that has high sphericity and soft touch characteristics.

In recent years, the negative impact on the environment and ecosystem caused by the outflow of plastic waste into the ocean has come to the fore and has attracted worldwide attention (Non-Patent Document 1). In particular, synthetic polymer particles with a particle diameter of 5 mm or less are commonly referred to as plastic microbeads (hereinafter referred to as PMB), and are becoming subject to regulations in many countries.

In the field of cosmetics, scrubbing agents (PMB with a median diameter of several hundred μm) that are incorporated into facial cleansers etc. were first subject to regulation, and domestic companies are replacing them with naturally derived particles such as cellulose (Non-patent Document 2). ).

On the other hand, pressed foundation (hereinafter referred to as PF) contains spherical powder made of synthetic polymer such as nylon or polyurethane with a median diameter of about 10 μm for the purpose of improving the feel. Since this PMB has unique rolling properties and softness, it has a large influence on the tactile characteristics of PF formulations, and it is currently very difficult to substitute it with other raw materials.

Spherical silica and spherical cellulose are examples of alternative raw materials for PMB contained in PF. Spherical cellulose having a porous structure through particle morphology control has been disclosed (Patent Documents 1 and 2). However, all of them had a harder feel than the above synthetic polymers and were not satisfactory as alternative raw materials.

Against this background, there is a potential desire to develop a spherical powder for cosmetics that can replace conventional synthetic polymers (PMB) that are environmentally compatible and soft to the touch. It is desired to develop solid powder cosmetics that eliminate the above-mentioned problems.

Japanese Patent Application Publication No. 1994-136175 Japanese Patent Application Publication No. 1985-197746

Koshien University Bulletin No. 45, p37-44 (2018) Current status and challenges of marine pollution caused by plastics, especially regarding microplastics Japan Cosmetic Industry Federation Voluntary Standards Notification Document Announced on March 17, 2016 Regarding the use of microplastic beads in wash-off scrub products

The present invention was made in view of the above circumstances, and contains a spherical composite powder for cosmetics that is highly spherical, soft to the touch, environmentally compatible, and has a soft feel even without containing PMB. The purpose of the present invention is to provide a solid powder cosmetic having excellent impact resistance.

Under these circumstances, the inventors of the present application have conducted extensive research to solve the above problems, and have found that aggregate particles composed of specific minerals and water-soluble polysaccharides are highly spherical and have a soft texture for use in cosmetics. It was discovered that a solid powder cosmetic that can be used as a spherical composite powder and contains the spherical composite powder has a soft feel and exhibits excellent impact resistance even without containing PMB, and in order to complete the present invention. It's arrived.

The present invention provides a solid powder cosmetic containing a spherical composite powder for cosmetics containing a mineral having a specific median diameter and a water-soluble polysaccharide.

The present invention provides a solid powder cosmetic containing a spherical composite powder for cosmetics that is highly spherical, soft to the touch, and environmentally compatible.

Electron microscope image of the spherical composite powder for cosmetics obtained in Particle Production Example 1

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The solid powder cosmetic of the present invention, which contains a spherical composite powder for cosmetics that is highly spherical, soft to the touch, and environmentally compatible, will be described below based on preferred embodiments thereof. According to the present invention, it is possible to obtain a solid powder cosmetic that has a soft feel and has excellent impact resistance without containing a conventional soft-touch synthetic polymer (PMB).

The component (a) of the component (A) contained in the solid powder cosmetic of the present invention is a natural mineral or a synthetic mineral containing two or more types of constituent elements among Si, Al, Mg, and K, and is usually a synthetic mineral. , there is no particular limitation as long as it is a mineral used in cosmetics. Examples include talc containing Si and Mg as constituent elements, sericite containing Si, Al, and K as constituent elements, and kaolin containing Si and Al as constituent elements.

The median diameter of component (a) of component (A) contained in the solid powder cosmetic of the present invention is 0.5 to 2.1 μm. More preferably, it is 0.6 to 1.5 μm. If it is larger than 2.1 μm, the sphericity of the resulting spherical composite powder for cosmetics will decrease. If it is 0.5 μm or more, a spherical composite powder for cosmetics having good sphericity can be obtained.

The median diameter of component (a) of component (A) contained in the solid powder cosmetic of the present invention can be determined using a general-purpose particle size distribution measuring device. For example, any of a laser diffraction method, a light scattering method, and an image analysis method may be used. Among these, in consideration of measuring the particle size range of the present invention, the laser diffraction method is preferable, and specifically, it is possible to measure the median diameter using Partica LA-950V2 (manufactured by HORIBA) or the like. can.

As the component (a) of the component (A) contained in the solid powder cosmetic of the present invention, commercially available products can be used. For example, Nano Ace D-600 (component: talc, median diameter: 0.6 μm, manufactured by Nippon Talc Co., Ltd.), Nano Ace D-1000F (component: talc, median diameter: 1.0 μm, manufactured by Nippon Talc Co., Ltd.), etc. can be used. can. Further, in order to obtain a mineral having a desired median diameter, a mineral having a median diameter larger than 2.1 μm may be separately prepared by subjecting it to a mechanical crushing process.

What is more important as a physical property of component (a) of component (A) contained in the solid powder cosmetic of the present invention is the shear viscosity, which is an index of the dispersion state of component (a). The sphericity of the spherical composite powder changes depending on the state of dispersion. In the present invention, the shear viscosity (shear rate 10/sec) obtained when a 40% by weight aqueous dispersion of component (a) is measured with an E-type viscometer is 100 mPa·s or more. More preferably, it is 1,000 mPa·s or more, most preferably 10,000 mPa·s or more. If the shear viscosity of the 40% by weight aqueous dispersion is less than 100 mPa·s, natural minerals or synthetic minerals may reduce the sphericity of the resulting spherical composite powder for cosmetics. A spherical composite powder for cosmetics with good sphericity can be obtained if the 40% by weight water dispersion is a natural mineral or a synthetic mineral with a shear viscosity of 100 mPa·s or more.

The shear viscosity of a 40% by weight aqueous dispersion of natural minerals or synthetic minerals constituting component (A) contained in the solid powder cosmetic of the present invention was measured at a constant shear rate using a general-purpose E-type viscometer. It can be specified as shear viscosity. Specifically, the shear viscosity can be measured using Physica MCR 301 (manufactured by Anton Paar).

Considering the above physical properties, the component (a) of component (A) contained in the solid powder cosmetic of the present invention is more preferably talc or kaolin, and most preferably talc.

The component (b) water-soluble polysaccharide of component (A) contained in the solid powder cosmetic of the present invention is not particularly limited as long as it is a water-soluble polysaccharide normally used in cosmetics. Specific examples include starch, water-soluble cellulose derivatives, and salts thereof. Examples of starches include seed starches such as rice starch, wheat starch, and corn starch, and rhizome starches such as tapioca starch and potato starch. Examples of water-soluble cellulose derivatives and salts thereof include carboxymethylcellulose and sodium carboxymethylcellulose.

The component (b) of component (A) contained in the solid powder cosmetic of the present invention is preferably starch. More preferred is seed starch, and most preferred is rice starch. Seed starch has a lower water swelling property than rhizome starch, and thus has a relatively low aqueous solution viscosity and good handling properties.

In the step of compounding component (A) contained in the solid powder cosmetic of the present invention, the aqueous dispersion concentration of the component (concentration in water that is the sum of the contents of component (a) and component (b)) is 2 ~40% by weight. More preferably, it is 5 to 20% by weight. If it is more than 40% by weight, the viscosity of the aqueous dispersion containing the component (a) and the component (b) will increase and the handling properties will decrease. When it is less than 2% by weight, the yield of the spherical composite powder for cosmetics decreases because the solid content concentration decreases.

The median diameter of component (A) contained in the solid powder cosmetic of the present invention is 3 to 30 μm. More preferably, it is 5 to 20 μm. If it is larger than 30 μm, graininess will occur and the soft touch characteristics will be poor.

The solid content weight ratio (mineral content:water-soluble polysaccharide content) of component (A) contained in the solid powder cosmetic of the present invention is 98:2 to 80:20. More preferably, the ratio is 95:5 to 85:15. If the proportion of the water-soluble polysaccharide is greater than 20% by weight, the viscosity of the water dispersion in the compositing step will increase, resulting in poor handling. On the other hand, if it is less than 2% by weight, the binding component between minerals will decrease, resulting in a decrease in the yield of spherical composite powder for cosmetics.

Component (A) contained in the solid powder cosmetic of the present invention can be used untreated, but may be used after being subjected to surface treatment as appropriate. The surface treatment agent is not particularly limited as long as it is a surface treatment agent that is normally used for powders for cosmetics. Specific examples of surface treatment agents include fluorine compounds, silicone compounds, ester compounds, metal soaps, waxes, oils and fats, hydrocarbons, and the like.

The component (A) contained in the solid powder cosmetic of the present invention is prepared through the following aqueous dispersion preparation steps (1), (2), and complexing step (3).
(1) Obtain an aqueous solution of water-soluble polysaccharide using a mechanical stirrer. At this time, in order to dissolve the water-soluble polysaccharide in water, it can be heated and dissolved as appropriate.
(2) A mineral is added to the aqueous solution of the water-soluble polysaccharide obtained in step (1), and an aqueous dispersion is obtained using a mechanical stirrer.
(3) The dispersion obtained in step (2) is subjected to a spray dryer, and the fine droplets are rapidly solidified in a high temperature field to obtain a spherical composite powder for cosmetics consisting of a mineral and a water-soluble polysaccharide.

The mechanical stirrer used in the manufacturing steps (1) and (2) of the component (A) contained in the solid powder cosmetic of the present invention is typically a stirrer used for dispersion in liquid. Not limited. Examples include a disper mixer, a homomixer, a high-pressure homogenizer, and the like.

In the manufacturing process (2) of the component (A) contained in the solid powder cosmetic of the present invention, water is The viscosity of the dispersion may be adjusted as appropriate.

The spray dryer used in the step (3) for producing component (A) contained in the solid powder cosmetic of the present invention is not particularly limited as long as it is a spray dryer that is normally used for producing granules. Spray dryers can be broadly classified into nozzle type and rotating disk type depending on the difference in spray mechanism, but spray dryers with either type of spray mechanism can be used.

In the production of component (A) contained in the solid powder cosmetic of the present invention, in order to obtain a spherical composite powder for cosmetics having a preferable median diameter, it is necessary to use a nozzle with two or more fluids among the above-mentioned spray dryers. It is preferable to use a spray dryer equipped with a rotary disk type spray mechanism or a rotating disk type spray mechanism.

The content of component (A) spherical composite powder for cosmetics contained in the solid powder cosmetic of the present invention is 0.1 to 20% by weight. More preferably 1 to 15% by weight, most preferably 3 to 10% by weight. If it is less than 0.1% by weight, the softness as a tactile property will be insufficient, and if it is more than 20% by weight, the proportion of spherical particles in the solid powder cosmetic will increase, which may reduce impact resistance. .

Component (B) hydrophobized cellulose contained in the solid powder cosmetic of the present invention is particles obtained by surface-treating crystalline cellulose with a commonly known treatment agent such as a silicone compound, a surfactant, a fatty acid, or a wax to make it hydrophobic. Alternatively, it is a particle composed of cellulose made hydrophobic by chemically modifying some or all of the three hydroxy groups of the glucose unit of crystalline cellulose, but in the present invention, among these, the three hydroxy groups of the glucose unit Preferably, the particles are made of cellulose that has been made hydrophobic by chemically modifying some or all of the hydroxy groups.

Cellulose itself is highly crystalline and hydrophobic due to the influence of intramolecular hydrogen bonds, but the hydrophobized cellulose preferred in the present invention is crystallized by chemically modifying some or all of the three hydroxy groups of the glucose unit. It refers to something that has been made hydrophobic while eliminating its sexual characteristics. In other words, it is clearly distinguished from hydrophobized cellulose, which is based on physical interactions such as van der Waals force and Coulomb force.

The content of component (B) hydrophobized cellulose contained in the solid powder cosmetic of the present invention is 1 to 10% by weight, more preferably 3 to 8% by weight.

Furthermore, as the component (B) hydrophobized cellulose contained in the solid powder cosmetic of the present invention, among celluloses made hydrophobized by chemically modifying some or all of the three hydroxy groups of glucose units, especially acetic acid Cellulose (acetylcellulose) is preferred.

Examples of powders other than the above contained in the solid powder cosmetic of the present invention include inorganic materials such as talc, sericite, mica, synthetic mica, silica, barium sulfate, alumina, boron nitride, titanium oxide, iron oxide, and zinc oxide. Examples include organic powders such as powder, silk powder, and crystalline cellulose powder, and one or more of these can be used. Further, these powders may be used after surface treatment with a commonly known treatment agent such as a fluorine compound, a silicone compound, a surfactant, a fatty acid, or a wax.

As a component other than the above contained in the solid powder cosmetic of the present invention, an oil agent commonly used in cosmetics can be contained. Oils include liquid paraffin, squalane, petrolatum, microcrystalline wax, ceresin, cetyl alcohol, isostearyl alcohol, oleyl alcohol, 2-hexyldecanol, cetyl 2-ethylhexanoate, isotridecyl isononanoate, 2-ethylhexyl palmitate, di-2 - Neopentyl glycol ethylhexanoate, neopentyl glycol dicaprylate, neopentyl glycol dicaprate, glycerin tri2-ethylhexanoate, glycerin triisostearate, polyglycerin fatty acid esters, pentaerythritol fatty acid esters, ethylhexyl methoxycinnamate, Examples include olive oil, macadamia nut oil, sunflower oil, lanolin, lauric acid, myristic acid, palmitic acid, stearic acid, beeswax, candelilla wax, carnauba wax, linear or cyclic dimethylpolysiloxane, methylphenylpolysiloxane, and the like.

In addition to the above-mentioned components contained in the solid powder cosmetic of the present invention, other components commonly used in cosmetics may also be contained, such as surfactants, fragrances, medicinal ingredients, refreshing agents, Examples include ultraviolet absorbers, stabilizers, antioxidants, preservatives, pH adjusters, viscosity adjusters, preservatives, and beauty ingredients.

The solid powder cosmetic base material of the present invention is prepared by stirring and mixing the constituent components using an apparatus for producing ordinary powder cosmetics. Specifically, powder containing component (A) is mixed uniformly. It is prepared by adding an oil to this powder, dispersing it uniformly, and pulverizing it. The thus obtained powdered cosmetic base material is filled into a container and molded to obtain a solid powdered cosmetic.

Hereinafter, the present invention will be explained in more detail with examples of particle production of component (A) contained in the solid powder cosmetic of the present invention and examples of solid powder cosmetics containing component (A). is not limited in any way by this. In addition, the numerical value in a table|surface means content (weight%). First, an example of particle production of the component (A) spherical composite powder for cosmetics contained in the solid powder cosmetic of the present invention will be described.

(Production method) Particle production examples 1 to 8, particle production comparative example 1
Step (1): Components 8 to 10 (water-soluble polysaccharides) in Table 1 below were added to component 11 (distilled water), and the aqueous solution was mixed using a homomixer (T.K. Robomix; manufactured by Primix). Prepared. Distilled water preheated to 90°C was used to dissolve components 8 and 9.
Step (2): Components 1 to 7 (minerals) in Table 1 below are added to the aqueous solution of water-soluble polysaccharide obtained in step (1), and the minerals and water-soluble polysaccharide are mixed using a homomixer under the following conditions. An aqueous dispersion of sugars was prepared. At this time, the concentration of the water dispersion was adjusted to 9.2% by weight, and the solid weight ratio of the mineral to the water-soluble polysaccharide was adjusted to 87:13.
Homo mixer rotation speed: 5000 rpm
Dispersion treatment time: 30 minutes Step (3): The aqueous dispersion obtained in Step (2) was subjected to a spray dryer (Model L-12; manufactured by Okawara Kakoki Co., Ltd.) under the following conditions, and the components 1 to 1 were A spherical composite powder for cosmetics consisting of 10 was obtained.
Spraying method: rotating disc Disc rotation speed: 25,000 rpm
Water dispersion flow rate: 160mL/min Supply air temperature: 220℃
Exhaust temperature: 105℃

(Sphericity evaluation method)
Regarding the sphericity of the spherical composite powders for cosmetics in the above particle production examples and particle production comparative examples, when observing the spherical composite powders for cosmetics using a scanning electron microscope at a magnification of 500 times, 100% of the composite powders are in the observation field. Composite powders with a circularity of 0.95 or more were considered to be spherical under the condition that the number of composite powders was 0.95 or more, and the proportion of the number of composite powders recognized as spherical was determined according to the criteria shown below. (Circularity was calculated by determining the projected area and circumference of the composite powder from image analysis.)
<Judgment criteria>
[Percentage of number of composite powders recognized as spherical] [Judgment]
75% or more ◎
50% or more ○
Less than 50% △
Less than 25% ×

(Softness evaluation method)
Five cosmetics expert panelists in their 20s to 40s were asked to spread the spherical composite powders for cosmetics from the above particle production examples and particle production comparison examples onto their fingertips or the back of their hands, and rate the softness using the following evaluation criteria. The average score was calculated for each spherical composite powder for cosmetics, and the evaluation was made according to the criteria shown below.
<Evaluation criteria>
[Usability] [Rating]
Very good: 5
Good: 4
Normal: 3
Slightly poor: 2
Defective: 1
<Judgment criteria>
[Average score] [Judgment]
4.5 or more ◎
3.5 or more and less than 4.5 ○
2 or more but less than 3.5 △
Less than 2 ×

*1 Nano Ace D-1000F (manufactured by Nippon Talc Co., Ltd.)
*2 Nano Ace D-600 (manufactured by Nippon Talc Co., Ltd.)
*3 FG-15F (manufactured by Nippon Talc Co., Ltd.)
*4 SG-95 (manufactured by Nippon Talc Co., Ltd.)
*5 P-3 (manufactured by Nippon Talc Co., Ltd.)
*6 Sericite FSE (manufactured by Sanshin Koko Co., Ltd.) is atomized through a mechanical crushing process *7 ASP-170 (manufactured by BASF) is atomized through a mechanical crushing process

The shear viscosity (shear rate 10/sec) of each mineral (talc, sericite, kaolin) used in particle production examples 1 to 3 in Table 1 in a 40% by weight aqueous dispersion was 81,650 and 340, respectively. , 2,920 mPa·s.

FIG. 1 shows an electron microscope image of the spherical composite powder for cosmetics obtained in Particle Production Example 1. A spherical composite powder with extremely high sphericity was obtained.

As a result of producing spherical composite powders for cosmetics by changing the types of minerals with the same median diameter, good spherical composite powders were obtained in all cases, and in particular, the system using talc as the mineral had the best results. A spherical composite powder having sphericity was obtained (Particle Production Examples 1 to 3).

As a result of manufacturing spherical composite powder for cosmetics using talc with different median diameters, it was found that spherical composite powder with good sphericity was obtained in the system using talc with a median diameter of 2.1 μm or less. However, in the system using talc with a median diameter of 5 μm, the sphericity decreased (Particle Production Examples 1 and 6 to 8, Particle Production Comparative Example 1).

As a result of producing spherical composite powders for cosmetics by changing the types of water-soluble polysaccharides, good spherical composite powders were obtained in all cases, especially when rice starch and carboxymethyl cellulose Na were used as water-soluble polysaccharides. A spherical composite powder having the best sphericity in the system was obtained (Particle Production Examples 1, 4, and 5).

(Production method) Particle production examples 9 to 14
Step (1): Component 2 in Table 2 below was added to Component 3 that had been previously heated to 90° C., and an aqueous solution was prepared using a homomixer (T.K. Robomix; manufactured by Primix Co., Ltd.).
Step (2): Add component 1 in Table 2 below to the aqueous solution of component 2 obtained in step (1), and use a homomixer to prepare an aqueous dispersion of minerals and water-soluble polysaccharides under the following conditions. did. At this time, the concentration of the water dispersion was adjusted to be 1 to 45% by weight. Further, the solid content weight ratio of mineral and water-soluble polysaccharide was adjusted to be 87:13.
Homo mixer rotation speed: 5000 rpm
Dispersion treatment time: 30 minutes Step (3): The aqueous dispersion obtained in Step (2) is subjected to a spray dryer (model MDL-050B; manufactured by Fujisaki Electric Co., Ltd.) to obtain a cosmetic composition consisting of components 1 and 2. A spherical composite powder was obtained.
Spraying method: 3 fluid nozzle PN3005
Water dispersion flow rate: 45mL/min Supply air temperature: 250℃
Exhaust temperature: 105℃

In particle production Examples 9 to 14 shown in Table 2, spherical composite powders for cosmetics were produced by fixing the solid content weight ratio of talc and rice starch to 87:13 and varying the water dispersion concentration. In systems where the aqueous dispersion concentration of the constituent components is 2 to 40% by weight, a spherical composite powder with good sphericity and softness can be obtained. % by weight, spherical composite powders with the best sphericity and softness were obtained (Particle Production Examples 9 to 12). In the system where the water dispersion concentration of the constituent components was 1% by weight, the yield of spherical composite powder was lower, and the sphericity and softness were inferior compared to particle production examples 9 to 12. Example 13). In addition, in the system where the concentration of the aqueous dispersion of the constituent components was 45% by weight, the yield of spherical composite powder was high, but the results were inferior in sphericity and softness compared to particle production examples 9 to 12. (Particle production example 14).

(Production method) Particle production examples 15 to 20
Step (1): Component 2 in Table 3 below was added to Component 3 that had been previously heated to 90° C., and an aqueous solution was prepared using a homomixer (T.K. Robomix; manufactured by Primix).
Step (2): Add component 1 in Table 3 below to the aqueous solution of component 2 obtained in step (1), and use a homomixer to prepare an aqueous dispersion of minerals and water-soluble polysaccharides under the following conditions. did. At this time, the solid content weight ratio of mineral and water-soluble polysaccharide was adjusted to be 1:99 to 75:25. Further, the concentration of the water dispersion was adjusted to 9.2% by weight.
Homo mixer rotation speed: 5000 rpm
Dispersion treatment time: 30 minutes Step (3): The aqueous dispersion obtained in Step (2) is subjected to a spray dryer (model MDL-050B; manufactured by Fujisaki Electric Co., Ltd.) to obtain a cosmetic composition consisting of components 1 and 2. A spherical composite powder was obtained.
Spraying method: 4 fluid nozzle SE4003
Water dispersion flow rate: 45mL/min Supply air temperature: 250℃
Exhaust temperature: 105℃

In particle production examples 15 to 20 in Table 3, the concentration of the aqueous dispersion of talc and rice starch was fixed at 9.2% by weight, and the solid content weight ratio was varied to produce spherical composite powders for cosmetics. . In a system where the solid content weight ratio of the constituent components is 98:2 to 80:20, a spherical composite powder having good sphericity and softness can be obtained, and especially when the solid content weight ratio of the constituent components is 95:5, A spherical composite powder having the best sphericity and softness was obtained with the 85:15 system (particle production examples 15 to 18). In systems where the solid content weight ratio of the constituent components was 99:1 and 75:25, the spherical composite powders were inferior in sphericity and softness compared to particle production examples 15 to 18. (Particle Production Examples 19 and 20).

Next, examples of solid powder cosmetics of the present invention are listed below. In addition, the numerical value in a table|surface means content (weight%).

*8 Pigment grade titanium oxide (average primary particle diameter 250 nm)

(Manufacturing method) Examples 1 to 10, Comparative Examples 1 and 2
Components 1 to 12 (powder part) were mixed uniformly using a Henschel mixer and pulverized using an atomizer. Furthermore, the mixed pulverized product of the powder part and pre-mixed components 13 and 14 (oil part) were added to a Henschel mixer and mixed uniformly, and after being pulverized with an atomizer, the mixture was passed through a sieve to obtain a powder cosmetic base material. The obtained powdered cosmetic base material was filled into an inner tray and compression molded to obtain a powder foundation.

(Evaluation method 1: Usability)
A panel of five cosmetic experts in their 20s to 40s used the solid powder cosmetics of the Examples and Comparative Examples of the present invention, and gave them ratings based on the following evaluation criteria regarding the softness when applied to the skin. Then, the average score was calculated for each solid powder cosmetic and judged according to the criteria shown below.
<Evaluation criteria>
[Usability] [Rating]
Very good: 5
Good: 4
Normal: 3
Slightly poor: 2
Defective: 1
<Judgment criteria>
[Average score] [Judgment]
4.5 or more ◎
3.5 or more and less than 4.5 ○
2 or more but less than 3.5 △
Less than 2 ×

(Evaluation method 2: Impact resistance)
Five solid powder cosmetics of Examples of the present invention and Comparative Examples were each prepared, and while filled in a resin dish, they were allowed to freely fall from a height of 1 m onto an acrylic plate in an upright direction, and after falling, The surface condition was observed, and a score was given according to the following evaluation criteria, and the average score was calculated for each solid powder cosmetic, and the evaluation was made according to the criteria shown below.
<Evaluation criteria>
[Impact resistance] [Rating]
No change: 4
There is a slight crack, but there is no problem with usability: 3
Cracks and lifting: 2
Large cracks and lifting: 1
<Judgment criteria>
[Average score] [Judgment]
3.5 or more ◎
3 or more but less than 3.5 ○
2 or more but less than 3 △
Less than 2 ×

Examples 1 to 10 of the present invention were all powder foundations with excellent softness and impact resistance in terms of touch characteristics, even without containing a synthetic polymer (PMB).

In systems that do not contain component (A) spherical composite powder for cosmetics, or in systems where the content is less than 0.1% by weight, the softness is insufficient (Comparative Example 1, Example 2) and 20% by weight. In a system in which a larger amount was blended, the usability was sufficient, but the impact resistance tended to decrease (Example 7). From these results, it was confirmed that the effects of the present invention are fully exhibited in solid powder cosmetics containing 0.1 to 20% by weight of component (A). In the system containing cellulose acetate alone, which corresponds to component (B), both the feeling of use and impact resistance were insufficient (Comparative Example 2). On the other hand, in the systems containing component (A) and component (B) in combination (Examples 8 to 10), compared to the systems containing each alone (Examples 3 and 6, Comparative Example 2), the tactile characteristics were The softness and impact resistance were good, and a synergistic effect was observed.

Example 11: Powder foundation Ingredient name Content (wt%)
1. Silicone-treated synthetic mica remaining amount 2. Silicone treated sericite 10.00
3. Silicone treated talc 15.00
4. Silicone-treated pigment grade titanium oxide 10.00
5. Silicone treated yellow iron oxide 3.30
6. Silicone treated valve handle 0.40
7. Silicone treated black iron oxide 0.19
8. Spherical composite powder described in particle production example 1 (3% by weight stearic acid treatment) 5.00
9. Silicic anhydride 5.00
10. Cellulose acetate 5.00
11. Methylparaben 0.20
12. Ethylparaben 0.10
13. Sodium chloride 0.10
14. Magnesium ascorbic acid-2-phosphate 1.00
15. Dimethicone 2.00
16. Neopentyl glycol diisononanoate 5.00
17. Ethylhexyl methoxycinnamate 4.00
18. (Isostearic acid/behenic acid)
(Glyceryl/Polyglyceryl-6) Esters 0.80
19. Tocopherol 0.05
20. Fragrance 0.05
Total 100.00

(Manufacturing method) Example 11
Components 1 to 14 (powder part) were mixed uniformly using a Henschel mixer and pulverized using an atomizer. Furthermore, the mixed pulverized product of the powder part and components 15 to 19 (oil part) that had been heated and mixed in advance were added to a Henschel mixer and mixed uniformly, and after being pulverized with an atomizer, the mixture was passed through a sieve to obtain a powder cosmetic base. Ta. The obtained powdered cosmetic base material was filled into an inner tray and compression molded to obtain a powder foundation.

Example 12: Powder foundation Ingredient name Content (wt%)
1. Silicone-treated synthetic mica remaining amount 2. Silicone treated sericite 10.00
3. Silicone treated talc 15.00
4. Silicone-treated pigment grade titanium oxide 10.00
5. Silicone treated yellow iron oxide 3.30
6. Silicone treated valve handle 0.40
7. Silicone treated black iron oxide 0.19
8. Spherical composite powder described in particle production example 1 (3 wt% sucrose distearate treatment) 10.00
9. Boron nitride 5.00
10. Cellulose acetate 1.00
11. Methylparaben 0.20
12. Ethylparaben 0.10
13. Sodium chloride 0.10
14. Magnesium ascorbic acid-2-phosphate 1.00
15. Dimethicone 2.00
16. Diethylhexyl succinate 5.00
17. Ethylhexyl methoxycinnamate 4.00
18. Tocopherol 0.05
19. Fragrance 0.05
Total 100.00

(Manufacturing method) Example 12
Components 1 to 14 (powder part) were mixed uniformly using a Henschel mixer and pulverized using an atomizer. Furthermore, the mixed pulverized product of the powder part and components 15 to 19 (oil part) that had been heated and mixed in advance were added to a Henschel mixer and mixed uniformly, and after being pulverized with an atomizer, the mixture was passed through a sieve to obtain a powder cosmetic base. Ta. The obtained powdered cosmetic base material was filled into an inner tray and compression molded to obtain a powder foundation.

Example 13: Pressed powder Ingredient name Content (wt%)
1. Talc remaining amount 2. Silicone treated synthetic sericite 5.00
3. Silicone treated synthetic mica 20.00
4. Silicone treated yellow iron oxide 0.24
5. Silicone treated valve handle 0.12
6. Silicone treated black iron oxide 0.03
7. Spherical composite powder described in particle production example 1 (5 wt% amodimethicone treatment) 7.00
8. Cellulose acetate 3.00
9. Methylparaben 0.20
10. Dimethicone 1.50
11. Vaseline 0.50
12. Squalane 1.50
13. Ethylhexyl methoxycinnamate 2.00
14. Tocopherol 0.05
15. Fragrance 0.05
Total 100.00

(Manufacturing method) Example 13
Components 1 to 9 (powder part) were mixed uniformly using a Henschel mixer and pulverized using an atomizer. Furthermore, the mixed pulverized product of the powder part and components 10 to 15 (oil part) that had been heated and mixed in advance were added to a Henschel mixer and mixed uniformly, and after being pulverized with an atomizer, passed through a sieve to obtain a powder cosmetic base. Ta. The obtained powdered cosmetic base material was filled into an inner tray and compression molded to obtain pressed powder.

Component (A) contained in Examples 11 to 13 were all surface-treated spherical composite powders, and were solid powder cosmetics with a particularly soft feel and excellent impact resistance.

The present invention provides a solid powder cosmetic that has a soft feel and has excellent impact resistance without containing a conventional synthetic polymer (PMB) that has a soft feel. According to the present invention, it is possible to develop an environmentally friendly cosmetic formulation.

Claims (6)

A solid powder cosmetic containing the following component (A) as a constituent component.
(A) Spherical composite powder for cosmetics containing the following components (a) and (b) as constituents (a) Talc with a median diameter of 0.5 to 2.1 μm, 40% by weight of which is dispersed in water Those with physical properties such that the shear viscosity (shear rate 10/sec) is 10,000 mPa・s or more when measured with an E-type viscometer.
(b) Water-soluble polysaccharide without pores The solid powder cosmetic according to claim 1, wherein the component (b) is starch without pores. The solid powder cosmetic according to claim 1 or 2, wherein the component (b) is a seed starch without pores. The solid powder according to any one of claims 1 to 3, wherein the weight ratio of component (a) to component (b) of component (A) is 98:2 to 80:20. Cosmetics. The solid powder cosmetic according to any one of claims 1 to 4, which further contains the following components in addition to the component (A) according to claim 1.
(B) Hydrophobized cellulose The solid powder cosmetic according to claim 5, wherein component (B) is cellulose acetate.