JP7555913B2 - Composite surface-treated inorganic powder and its manufacturing method, oil dispersion and cosmetic containing the inorganic powder - Google Patents

Description

The present invention relates to a composite surface-treated inorganic powder obtained by surface-treating a base powder mainly made of an inorganic material with a specific compound, and in particular to a composite surface-treated inorganic powder obtained by surface-treating the base powder with a cationic surfactant and an amino-modified silicone, which has softness equivalent to that of resin beads and excellent adhesion to the skin, a method for producing the same, and an oil-based dispersion and cosmetic composition containing the inorganic powder.

Traditionally, many cosmetics have been formulated with nylon powder or resin beads such as silicone beads (a type of microplastic) to improve the feel during use by imparting softness, moisture, and a smooth texture. However, in recent years, pollution of the marine environment by microplastics has become a problem, and there is a demand for cosmetics that do not contain microplastics.

For this reason, as powder materials other than resin beads that are blended into cosmetics to improve the feel when used, for example, powders that are surface-treated with amino-modified silicone have been developed, as described in JP-A No. 2004-182729 (Patent Document 1) and JP-A No. 2009-062324 (Patent Document 2). Similarly, powders that have adsorbed cationic surfactants have also been developed, as described in JP-A No. 2008-291026 (Patent Document 3).

However, the powders for incorporation into cosmetics described in Patent Documents 1 to 3 are not fully satisfactory in terms of feel when used, such as softness, moist feeling, and smooth feeling, compared to the resin beads mentioned above, and there is a particular problem in that they do not provide the softness characteristic of resin beads.

JP 2004-182729 A JP 2009-062324 A JP 2008-291026 A

Therefore, the present invention has been made in consideration of the above circumstances, and aims to provide a powder for cosmetics that can impart a feel to cosmetics that is equal to or better than that of resin beads, and a method for producing the same, or to provide an oil dispersion or cosmetic that has an excellent feel when used without incorporating resin beads, by incorporating the material into an oil dispersion or cosmetic.

As a result of extensive research into alternative materials and surface treatment materials for them that can impart a feel to cosmetics equal to or greater than that of resin beads, the inventors discovered that by surface-treating a base powder mainly made of inorganic material with a cationic surfactant and amino-modified silicone, a composite surface-treated inorganic powder with performance equal to or greater than that of resin beads can be obtained, thus completing the present invention.

That is, according to the present invention, by surface-treating at least a portion of the surface of a base powder mainly made of an inorganic material with a cationic surfactant and an amino-modified silicone, a composite surface-treated inorganic powder is provided, which is made of a base powder mainly made of an inorganic material and surface-treated with a cationic surfactant and an amino-modified silicone.

The composite surface-treated inorganic powder obtained by the present invention has adhesion to the skin equal to or greater than that of resin beads and has an excellent feel on the skin when used, and further, when incorporated into cosmetics, it can impart to the cosmetics a feel equal to or greater than that of resin beads.

The composite surface-treated inorganic powder of the present invention has a special composite surface treatment applied to a base powder mainly made of an inorganic material as a base material, and therefore has extremely soft characteristics with an average particle deformation rate of 20% or more, more preferably 23% or more, compared to inorganic powders that have not been subjected to such surface treatment. In addition, examples of base powders that achieve such an average particle deformation rate include those containing one or more types selected from the group consisting of silica, titanium oxide, zinc oxide, alumina, and iron oxide.

By using a cationic surfactant as one of the surface treatment agents, the composite surface-treated inorganic powder of the present invention can obtain adhesion to the skin equal to or greater than that of resin beads, as well as excellent tactile properties on the skin during use.

There are no particular limitations on the type of cationic surfactant that can be used as a surface treatment agent, but in order to obtain the above characteristics, it is preferable to use a quaternary ammonium salt having a long-chain alkyl group with 8 to 26 carbon atoms. Among these, those having two long-chain alkyl groups are more preferable.

Specific examples of cationic surfactants that can be used include distearyl dimethyl ammonium chloride, dialkyl (C12-C18) dimethyl ammonium chloride, lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, octadecyloxypropyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, and benzalkonium chloride. Of these, it is particularly preferable to use distearyl dimethyl ammonium chloride.

The surface treatment amount of the cationic surfactant is preferably 0.1 to 5.0 parts by mass, more preferably 0.1 to 2.0 parts by mass, per 100 parts by mass of the base powder. By carrying out the surface treatment with a treatment amount in this range, a composite surface-treated inorganic powder with a better feel during use can be obtained. Furthermore, if the surface treatment amount is too small, the adhesion to the skin may be poor and the cosmetic may easily come off after application. On the other hand, if the surface treatment amount is too large, it may cause inconvenience in terms of feel, such as stickiness when applied to the skin. In addition, the numerical value (ratio) range indicated using "~" in this specification indicates a range that includes the numerical values (ratios) written before and after "~" as the minimum value (ratio) and maximum value (ratio), respectively.

The composite surface-treated inorganic powder of the present invention can achieve a soft feel equal to or even softer than that of resin beads by using amino-modified silicone as another surface treatment agent.

The amount of amino-modified silicone used for surface treatment is preferably 0.5 to 5.0 parts by mass, and more preferably 0.5 to 2.0 parts by mass, per 100 parts by mass of base powder. By carrying out surface treatment with a treatment amount in this range, the feel of the composite surface-treated inorganic powder can be made very good. If the amount of surface treatment is too small, the hardness specific to the inorganic material used as the base material may be easily felt when applied to the skin, and the feel may be poor. On the other hand, if the amount of surface treatment is too large, the feel may also be poor, such as a sticky feeling when applied to the skin.

Furthermore, by incorporating the composite surface-treated inorganic powder of the present invention, it is possible to obtain oil-based dispersions and cosmetics that exhibit a feel when used that is equal to or greater than that when resin beads are incorporated, such as softness, moistness, and smoothness.

According to the present invention, at least a portion of the surface of a base powder mainly made of an inorganic material is surface-treated with a cationic surfactant and an amino-modified silicone to provide a composite surface-treated inorganic powder consisting of a base powder mainly made of an inorganic material that has been surface-treated with a cationic surfactant and an amino-modified silicone.

As a result, according to the present invention, it is possible to obtain a composite surface-treated inorganic powder that uses an inorganic material such as silica as a base material, but has softness equal to or greater than that of resin beads, which are organic substances, and has excellent adhesion to the skin.

In addition, according to the present invention, by blending the composite surface-treated inorganic powder of the present invention, it is possible to obtain an oil-based dispersion or cosmetic that exhibits a feeling of use such as softness, moistness, and smoothness equivalent to or greater than that achieved by blending resin beads.

The composite surface-treated inorganic powder of the present invention, its manufacturing method, and the oil dispersion and cosmetic composition containing the inorganic powder will be described in detail below, with specific examples. Note that the present invention is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical concept of the present invention.

(Base Powder)
There are no particular limitations on the inorganic material that can be used as the base material of the composite surface-treated inorganic powder of the present invention, and examples of the inorganic material that can be used include silica, titanium oxide, zinc oxide, alumina, iron oxide, etc. Among these, silica is particularly preferred.

The base powder preferably has an average particle size measured by a laser diffraction light scattering method in the range of 0.1 to 50 μm, more preferably in the range of 0.3 to 30 μm, and even more preferably in the range of 1 to 15 μm. If the average particle size is smaller than 0.1 μm, the particles tend to aggregate with each other, which may prevent uniform surface treatment and make it difficult to improve the feel, and if it is larger than 50 μm, the physical roughness may become stronger. In the examples described below, the base powder was added to methanol and dispersed by ultrasonic irradiation for 1 minute, and then the average particle size was measured using a particle size distribution measuring device (Microtrac HRA manufactured by Microtrac-Bell).

Furthermore, the particle shape of the base powder may be any shape commonly used in cosmetics, such as spherical, approximately spherical, hemispherical, spindle-shaped, needle-shaped, plate-shaped, polyhedral, or star-shaped, but rounded shapes such as spherical, approximately spherical, or hemispherical are preferred. The particles of the base powder may be either nonporous or porous.

(Cationic Surfactant)
In the composite surface-treated inorganic powder of the present invention, by using a cationic surfactant as the surface treatment agent, it is possible to obtain a composite surface-treated inorganic powder that has good adhesion to the skin and is excellent in feel during use.

There are no particular limitations on the type of cationic surfactant that can be used as a surface treatment agent, but it is preferable to use a quaternary ammonium salt having a long-chain alkyl group with a carbon number of 8 to 26. Among these, those having two long-chain alkyl groups are more preferable.

Specific examples of cationic surfactants that can be used include distearyl dimethyl ammonium chloride, dialkyl (C12-C18) dimethyl ammonium chloride, lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, octadecyloxypropyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, benzalkonium chloride, etc. Among these, it is particularly preferable to use distearyl dimethyl ammonium chloride.

The surface treatment amount of the cationic surfactant is preferably 0.1 to 5.0 parts by mass, and more preferably 0.1 to 2.0 parts by mass, per 100 parts by mass of the base powder. By carrying out the surface treatment with a treatment amount in this range, it is possible to obtain a composite surface-treated inorganic powder that has an even better feel when used. Furthermore, if the surface treatment amount is too small, the adhesion to the skin may be poor and the cosmetic may easily come off after application. On the other hand, if the surface treatment amount is too large, it may cause inconvenience in terms of feel, such as stickiness when applied to the skin.

(Amino modified silicone)
In the composite surface-treated inorganic powder of the present invention, by using an amino-modified silicone as a surface treatment agent, it is possible to impart a soft feel to the composite surface-treated inorganic powder.

Examples of commercially available amino-modified silicones that can be used as surface treatment agents include Shin-Etsu Chemical's KF-8004, KF-8005S, KF-8015, KF-867S, X-52-2265, and X-52-2328; Dow-Toray's DOWSIL (registered trademark) SM8904 Cosmetic Emulsion, SF8452C, and SS-3551; and Wacker Chemie's BELSIL (registered trademark). Examples of such materials include ADM1370, ADM1650, ADM8103E, ADM8104E, ADM8105E, ADM9700E, ADM6300E, ADM6057E, ADM8301E, ADM6102E, ADM9000E, Momentive Performance Materials' XF42-B1989, XF42-B8922, XF42-C0330, SF1708, XF49-C1109, Silsoft (registered trademark) AX, and Silsoft A+.

The amount of amino-modified silicone used for surface treatment is preferably 0.5 to 5.0 parts by mass, and more preferably 0.5 to 2.0 parts by mass, per 100 parts by mass of base powder. By carrying out surface treatment with a treatment amount in this range, the feel of the composite surface-treated inorganic powder can be made very good. If the amount of surface treatment is too small, the hardness specific to the inorganic material used as the base material may be easily felt when applied to the skin, and the feel may be poor. On the other hand, if the amount of surface treatment is too large, the feel may also be poor, such as a sticky feeling when applied to the skin.

(Surface treatment method)
The surface treatment method for obtaining the composite surface-treated inorganic powder of the present invention may be appropriately selected in consideration of the physical properties of the base powder and the surface treatment agent. For example, the base powder may be dispersed in a dispersion medium, the surface treatment agent may be added and stirred, and then the mixture may be filtered and dried, or the surface treatment agent may be added to the dry powder and mixed, but is not limited thereto. When performing surface treatment with a cationic surfactant, it is preferable to use a dispersion medium containing water.

(Average particle deformation ratio)
The composite surface-treated inorganic powder of the present invention preferably has an average particle deformation ratio of 20% or more, more preferably 23% or more, obtained by the following method. By imparting such an average particle deformation ratio, it is possible to obtain a composite surface-treated inorganic powder that has extremely soft properties and an excellent feel compared to inorganic powders that have not been surface-treated.

(Method of calculating average particle deformation ratio)
The measurement for calculating the average particle deformation ratio is carried out in accordance with the method described in JIS Z8844 (Method for measuring the breaking strength and deformation strength of fine particles).
First, particles are randomly sampled from the composite surface-treated inorganic powder and set on a sample stage.
Next, with the tip of the indenter in contact with the sample particle, the distance between the sample stage and the indenter is measured, and this is taken as the particle diameter D (μm) of the sample particle.
Next, the sample particle is compressed with a test force (force applied when compressing the particle with an indenter) of 5 mN, and the displacement X (μm) at this time is measured.
The particle deformation rate of the sample particle is calculated from the displacement X (μm) and the particle diameter D (μm) of the sample particle according to the following formula.
Formula: Particle deformation rate (%) = displacement X (μm) / particle diameter D (μm) of sample particle × 100
This measurement is carried out for five sample particles, and the average value of the obtained particle deformation ratios is regarded as the average particle deformation ratio.

(Cosmetics)
By incorporating the composite surface-treated inorganic powder of the present invention into a cosmetic such as a foundation, or by incorporating the composite surface-treated inorganic powder of the present invention into an oil dispersion and then incorporating the oil dispersion into a cosmetic such as a foundation, a cosmetic having an excellent feel when used can be obtained.

1. Preparation of cosmetic powder (Example 1)
<Step 1: Surface treatment with cationic surfactant>
100 g of silica powder (Sunsphere NP-30, manufactured by AGC Si-Tech Co., Ltd.) having an average particle size of 5 μm was dispersed in 1000 g of ion-exchanged water, and the mixture was heated to 80° C., after which 1.3 g of distearyldimethylammonium chloride having a concentration of 75% by mass (NIKKOL CA-3475V, manufactured by Nikko Chemicals Co., Ltd.) was added and stirred for 60 minutes, filtered, washed with water, and then placed in a dryer and dried at 85° C. for 20 hours. Note that NIKKOL CA-3475V, manufactured by Nikko Chemicals Co., Ltd., is distearyldimethylammonium chloride having a concentration of 75% by mass.
<Step 2: Surface treatment with amino-modified silicone>
The powder obtained in step 1 was placed in a benchtop blender, and 2.0 g of amino-modified silicone (KF-8004, manufactured by Shin-Etsu Chemical Co., Ltd.) was added thereto and stirred for 20 minutes. The mixture was then placed in a dryer and dried at 120°C for 3 hours, and then pulverized to produce the composite surface-treated inorganic powder of Example 1.

Example 2
A composite surface-treated inorganic powder of Example 2 was prepared by carrying out the same procedure as in Example 1, except that the amount of distearyldimethylammonium chloride added was 0.13 g.

Example 3
A composite surface-treated inorganic powder of Example 3 was prepared by carrying out the same procedure as in Example 1, except that the amount of distearyldimethylammonium chloride added was 0.65 g.

Example 4
A composite surface-treated inorganic powder of Example 4 was prepared by carrying out the same procedure as in Example 1, except that the amount of distearyldimethylammonium chloride added was 2.6 g.

Example 5
A composite surface-treated inorganic powder of Example 5 was prepared by carrying out the same procedure as in Example 1, except that the amount of amino-modified silicone added was 0.5 g.

Example 6
A composite surface-treated inorganic powder of Example 6 was prepared by carrying out the same procedure as in Example 1, except that the amount of amino-modified silicone added was 1.0 g.

(Example 7)
A composite surface-treated inorganic powder of Example 7 was prepared by carrying out the same procedure as in Example 1, except that the amount of amino-modified silicone added was 5.0 g.

(Example 8)
The composite surface-treated inorganic powder of Example 8 was prepared by the same procedure as in Example 1, except that silica powder having an average particle size of 3 μm (Godball G-6C, manufactured by Suzuki Oil Industries Co., Ltd.) was used.

Example 9
The composite surface-treated inorganic powder of Example 9 was prepared by the same procedure as in Example 1, except that silica powder having an average particle size of 10 μm (Sunsphere NP-100, manufactured by AGC Si-Tech Co., Ltd.) was used.

(Comparative Example 1)
The silica powder (Sunsphere NP-30, manufactured by AGC Si-Tech Co., Ltd.), which is the base material of the composite surface-treated inorganic powder of Example 1, was used as the powder of Comparative Example 1.

(Comparative Example 2)
100 g of silica powder (Sunsphere NP-30, manufactured by AGC Si-Tech Co., Ltd.) having an average particle size of 5 μm was placed in a benchtop blender, 2.0 g of dimethicone (KF-96-1000CS, manufactured by Shin-Etsu Chemical Co., Ltd.) was added thereto, and the mixture was stirred for 20 minutes. The mixture was then placed in a dryer and dried at 120° C. for 3 hours, and then pulverized to produce the powder of Comparative Example 2.

(Comparative Example 3)
The powder obtained by carrying out only step 1 of Example 1 was used as the powder of Comparative Example 3.

(Comparative Example 4)
Instead of the powder obtained in step 1 of Example 1, silica powder (Sunsphere NP-30 manufactured by AGC Si-Tech Co., Ltd.), which is the base material of the composite surface-treated inorganic powder of Example 1, was used, and only step 2 of Example 1 was carried out to produce the powder of Comparative Example 4.

(Reference Example 1)
Silicone resin beads (Tospearl (registered trademark) 145A, manufactured by Momentive Performance Materials, Inc.) were used as the powder in Reference Example 1.

(Calculation of average particle deformation ratio)
For five sample particles randomly sampled from each powder in the Examples, Comparative Examples, and Reference Examples, a microparticle crushing force measuring device (NS-A100 manufactured by Nano Seeds Corporation) was used to measure the particle diameter D (μm) and the displacement X (μm) when compressed with a test force of 5 mN. The particle deformation ratios obtained from the following formula were averaged to calculate the average particle deformation ratio of each powder.
Particle deformation rate (%) = displacement X (μm) / particle diameter D (μm) of sample particle × 100

(Evaluation of adhesion and feel of each powder to the skin)
Each powder of the Examples, Comparative Examples, and Reference Examples was evaluated for its adhesion to the skin and its feel by a sensory test conducted by five monitors. Specifically, a small amount of each powder was taken and applied to the back of the hand with the fingers, and the monitors were asked to evaluate the adhesion to the skin and its feel according to the following criteria, and the average value was calculated.
<Evaluation criteria>
5 points: Very good 4 points: Good 3 points: Average 2 points: Poor 1 point: Very bad

Table 1 shows the preparation conditions and evaluation results (average particle deformation rate, adhesion to skin, and feel) of each powder in the Examples, Comparative Examples, and Reference Examples.

From Table 1, it can be seen that the composite surface-treated inorganic powders of Examples 1 to 9 have adhesion to the skin equal to or greater than that of the powder (silicone resin) of Reference Example 1, which is a resin bead, and provide excellent feel characteristics on the skin during use. On the other hand, the powders of Comparative Examples 1 to 4 were inferior in at least either adhesion to the skin or feel.

In addition, the composite surface-treated inorganic powders of Examples 1 to 9 not only have superior adhesion to the skin and superior feel to the skin during use compared to the inorganic powder of Comparative Example 1, which was not surface-treated, the inorganic powder of Comparative Example 2, which was surface-treated with a surface treatment agent other than a cationic surfactant and amino-modified silicone (dimethicone), the inorganic powder of Comparative Example 3, which was surface-treated only with a cationic surfactant, and the inorganic powder of Comparative Example 3, which was surface-treated only with an amino-modified silicone, but also have extremely soft characteristics, with an average particle deformation rate of 20% or more, more preferably 23% or more. Therefore, in order to obtain the above-mentioned characteristics in inorganic powders such as silica, which are generally considered to be hard, it has been found that it is extremely effective to use a cationic surfactant such as distearyldimethylammonium chloride and an amino-modified silicone as a surface treatment agent.

Furthermore, by comparing the composite surface-treated inorganic powders of Examples 1 to 9 with the powders of Comparative Examples 1 to 4, it was found that the surface treatment amount of the cationic surfactant is preferably 0.1 to 5.0 parts by mass, and more preferably 0.1 to 2.0 parts by mass, per 100 parts by mass of the base powder, and the surface treatment amount of the amino-modified silicone is preferably 0.5 to 5.0 parts by mass, and more preferably 0.5 to 2.0 parts by mass, per 100 parts by mass of the base powder.

In addition, it was found that when the composite surface-treated inorganic powders of Examples 1 to 9 have an average particle size measured by a laser diffraction light scattering method within the range of preferably 0.1 to 50 μm, more preferably 0.3 to 30 μm, and even more preferably 1 to 15 μm, uniform surface treatment is not hindered by aggregation of particles, the feel is improved, and the physical roughness is suppressed.

2. Preparation of Cosmetics Next, cosmetics (W/O sunscreen milk: SPF50+, PA++++) of Example 10, Comparative Example 5, and Reference Example 2 were prepared with the blending compositions (parts by mass) shown in Table 2. Specifically, an oily composition (oil-based dispersion) was prepared by mixing the materials constituting the oil phase of the cosmetics, and an aqueous composition was prepared by mixing the materials constituting the aqueous phase of the cosmetics, and then these were mixed to prepare the cosmetics.

(Evaluation of the feel of each cosmetic)
The obtained cosmetics were subjected to a sensory test by 10 monitors to evaluate the feel of use. Specifically, each cosmetic was applied to the inside of the forearm in an amount of 2 mg/ ^cm2, and the monitors were asked to evaluate the softness, smoothness, and absence of squeaking according to the following criteria, and the average value was calculated.
<Evaluation criteria>
5 points: Very good 4 points: Good 3 points: Average 2 points: Poor 1 point: Very bad

The formulations and evaluation results (softness, smoothness, absence of squeaking) of the cosmetics of Example 10, Comparative Example 5, and Reference Example 2 are shown in Table 2.

From Table 2, it was found that the cosmetic of Example 10, which contains the composite surface-treated inorganic powder of Example 1, provides a better feel (softness, smoothness, and lack of squeaking) than the cosmetic of Reference Example 2, which contains the powder of Reference Example 1 (silicone resin), which is a resin bead. On the other hand, the cosmetic of Comparative Example 5, which contains the powder of Comparative Example 1, provided an inferior feel to the cosmetic of Example 10, particularly in terms of softness and lack of squeaking.

Next, powder cosmetics (face powder) of Example 11, Comparative Example 6, and Reference Example 3 were prepared with the formulation (parts by weight) shown in Table 3, and the sensation of use was evaluated in the same manner as for the aforementioned cosmetic (W/O sunscreen milk).

The formulations and evaluation results (softness, smoothness, absence of squeaking) of the powder cosmetics of Example 11, Comparative Example 6, and Reference Example 3 are shown in Table 3.

From Table 3, it was found that the powder cosmetic of Example 11, by blending the composite surface-treated inorganic powder of Example 1, was able to obtain a feel in use (softness, smoothness, absence of squeaking) equal to or better than that of the cosmetic of Reference Example 3, which blended the powder (silicone resin) of Reference Example 1, which is resin beads. On the other hand, the cosmetic of Comparative Example 6 resulted in a feel in use that was significantly inferior to that of Example 11, particularly in terms of softness.

Claims (10)

A base powder mainly made of an inorganic material is surface-treated with a cationic surfactant and an amino-modified silicone,
The base powder is silica,
The cationic surfactant includes one or more selected from the group consisting of distearyl dimethyl ammonium chloride, dialkyl (C12-C18) dimethyl ammonium chloride, lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, octadecyloxypropyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, and benzalkonium chloride;
The surface treatment amount of the cationic surfactant is 0.1 to 5.0 parts by mass relative to 100 parts by mass of the base powder,
The composite surface-treated inorganic powder to be blended in a cosmetic composition has a surface treatment amount of 0.5 to 5.0 parts by mass per 100 parts by mass of the base powder . 2. The composite surface-treated inorganic powder according to claim 1, wherein the base powder has an average particle size of 1 to 15 μm. 3. The composite surface-treated inorganic powder according to claim 1, wherein the surface treatment amount of the cationic surfactant is 0.1 to 2.0 parts by mass per 100 parts by mass of the base powder. 4. The composite surface-treated inorganic powder according to claim 1, wherein the average particle deformation rate is 20% or more. 5. The composite surface-treated inorganic powder according to claim 1 , wherein the cationic surfactant is distearyldimethylammonium chloride. An oil-based dispersion comprising the composite surface-treated inorganic powder according to any one of claims 1 to 5 . A cosmetic preparation comprising the composite surface-treated inorganic powder according to any one of claims 1 to 5 . The method includes surface-treating at least a portion of a surface of a base powder mainly made of an inorganic material with a cationic surfactant and an amino-modified silicone,
The base powder is silica,
The cationic surfactant includes one or more selected from the group consisting of distearyl dimethyl ammonium chloride, dialkyl (C12-C18) dimethyl ammonium chloride, lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, octadecyloxypropyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, and benzalkonium chloride;
The surface treatment amount of the cationic surfactant is 0.1 to 5.0 parts by mass relative to 100 parts by mass of the base powder,
The method for producing a composite surface-treated inorganic powder to be blended in a cosmetic, wherein the surface treatment amount of the amino-modified silicone is 0.5 to 5.0 parts by mass per 100 parts by mass of the base powder . The method according to claim 8, wherein the base powder has an average particle size of 1 to 15 μm. 10. The method according to claim 8, wherein the amount of the cationic surfactant used for surface treatment is 0.1 to 2.0 parts by mass with respect to 100 parts by mass of the base powder.