JP2001002529A - Cosmetics compounded with fine powder of conductive zinc oxide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain cosmetics capable of protecting the skin from ultraviolet rays for a long time, excellent in lasting effect of make up by compounding a specific fine power of conductive zinc oxide. SOLUTION: The cosmetics are compounded with fine powder of conductive zinc oxide having specific surface area 2-100 m2/g (0.01-0.5 μm converted into particle diameter) and volume resistivity <=500 Ωcm. The conductive zinc oxide is obtained by doping Al3+, In3+, Ti4+, Sn4+, etc., into a crystal lattice of zinc oxide to impart conductivity, Al is preferred as the dopant (a conductivity imparting component). The preferable amount of compounding the conductive zinc oxide to cosmetics is >=5 wt.% based on the weight of the remaining components on skin excluding volatile components such as water, alcohol, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic composition which is blended with a conductive zinc oxide fine powder and which has an excellent ultraviolet absorbing ability and excellent makeup.

[0002]

2. Description of the Related Art Makeup cosmetics and foundation cosmetics such as foundations, lotions, emulsions and creams have the aesthetic role of hiding skin spots and wrinkles, giving them the desired color, and giving them an attractive appearance and giving them a beautiful appearance. It also has a protective role on the skin.

In particular, in recent years, the environmental problem of ozone layer depletion has become a major issue, and recent dermatological studies have shown that exposure to ultraviolet radiation causes spots, freckles, and aging of the skin. In addition, it has been found that ultraviolet rays have an unexpectedly adverse effect on skin, such as damaging skin cell genes, and there has been a great interest in protecting skin from harmful ultraviolet rays. For this reason, cosmetics are also required to have an ultraviolet shielding effect that protects the skin from ultraviolet rays, and in order to respond to this, cosmetics such as makeup cosmetics and basic cosmetics that contain an ultraviolet absorber such as zinc oxide have been developed. It has been.

[0004] Among them, zinc oxide particles basically have an excellent ultraviolet absorbing ability, and some cosmetics or zinc oxide suitable for blending the same as an ultraviolet absorber have been proposed. JP-A-5-17329, JP-A-5-24
No. 6823, JP-A-5-213618, JP-A-7-1
No. 18133, JP-A-7-10538, JP-A-8-5
No. 3568). As a result, when makeup is applied with a cosmetic in which zinc oxide is blended as an ultraviolet absorber, there is obtained an almost satisfactory role of protecting the skin from ultraviolet rays.

[0005] However, when the makeup is actually applied to the skin, the cosmetics peel off due to sweating or the like over time, and it is not always easy to maintain the effect for a long time. The long-lasting effect, that is, good makeup lasting, is a very important factor in protecting the skin by making full use of the original effect of zinc oxide. In addition, cosmetics that have good makeup often mean that makeup does not need to be redressed. From this point of view, the need for cosmetics with good makeup is extremely high.

On the other hand, while the effect of protecting the skin from ultraviolet rays is maintained for a long time in a zinc oxide-containing cosmetic, for example, Japanese Patent Application Laid-Open No. Hei 7-118133 discloses a specific specific surface area and a low impurity element content. It has been proposed to increase the reactivity with free fatty acids present in sebum by using zinc oxide to gel the sebum. However, in this method, it is possible to increase the reactivity with free fatty acids present in sebum to some extent, but it is difficult to greatly improve the makeup stickiness by itself, and further improvement is required. Have been.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cosmetic composition having good makeup and protecting skin from ultraviolet rays for a long time.

[0008]

Means for Solving the Problems The present inventors have conducted intensive studies on a method of improving the cosmetic moistness, which is a problem of the prior art, and as a result, by adding conductive zinc oxide fine powder to cosmetics, It has been found that it not only absorbs ultraviolet rays, but also prevents transmission of infrared rays, and can reduce heat rays to the skin. For this reason, the temperature felt by the skin is reduced, so-called hot flash feeling is reduced, sweating is suppressed, makeup collapse due to sweat is much less than conventional cosmetics, and makeup is maintained for a long time. The present invention has been made based on such findings.

That is, according to the present invention, the following inventions are provided. (1) Specific surface area of ² to 100 m ² / g, volume resistivity 5
A cosmetic comprising a conductive zinc oxide fine powder having a size of not more than 00 Ωcm.

(2) The cosmetic according to (1), wherein the amount of the conductive zinc oxide fine powder is at least 5% by weight as a residual component on the skin excluding volatile components.

(3) The cosmetic according to (1) or (2), wherein the conductive zinc oxide fine powder is a zinc oxide fine powder using aluminum as a conductivity-imparting component.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

The conductive zinc oxide used in the present invention has a specific surface area of ² to 100 m ² / g, more preferably 1 to 100 m ² / g.
0 to 100 m ² / g, more preferably 20 to 100 m
A fine powder of ² / g is desirable. When the specific surface area is much smaller than 2, although the performance such as ultraviolet absorption ability does not change, the added cosmetic does not have a transparent feeling, and it is not suitable for the original purpose of the makeup, which is not preferable. Further, those having a specific surface area of more than 100 m ² / g are difficult to manufacture with the current technology, the manufacturing cost is high, and practical use is practically difficult.

In the present invention, the specific surface area is determined by a known BET.
It is a value measured by the method. When these specific surface areas are converted into particle diameters, they are about 0.01 to 0.5 μm, preferably about 0.01 to 0.1 μm.

The conductivity of the conductive zinc oxide used in the present invention is at least 500 Ωcm in volume resistivity.
Or less, more preferably 100 Ωcm or less. On the other hand, the lower limit of the volume resistivity is preferably lower, but the range in which the production is practically easy is about 10 to 100 Ωcm. When the volume resistivity exceeds 500 Ωcm, the ability to prevent infrared transmission, which is the object of the present invention, decreases, and the effect of suppressing perspiration of the skin decreases.

In the present invention, the volume resistivity of the conductive zinc oxide is a value (Ωcm) obtained by placing a 10 g sample in a Teflon-coated cylinder having an inner diameter of 25 mm, applying a pressure of 100 kg / cm ² and measuring with a tester.

The conductive zinc oxide used in the present invention is obtained by doping the crystal lattice of zinc oxide with Al ³⁺ , In ³⁺ , Ti ⁴⁺ , Sn ^4+, etc. to impart conductivity.
As the (conductivity-imparting component), aluminum is most preferable in terms of doping performance and cost.

The method of producing the conductive zinc oxide used in the present invention is not particularly limited, and the specific surface area is 2
Basically, any method can be used as long as a conductive zinc oxide fine powder having a volume resistivity of up to 100 m ² / g and a volume resistivity of 500 Ωcm or less can be obtained. preferable.

Examples of the zinc oxide as a starting material include a French method in which zinc is melted and evaporated and oxidized in a gas phase, an American method in which zinc ore is calcined, coke reduced and oxidized, and a basic method in which soda ash is added to a zinc salt solution. Any of a wet method of precipitating zinc carbonate, drying and calcining may be used, but the specific surface area is preferably in the above range.

The zinc oxide fine particles produced by these general production methods can be used, for example, in an aqueous solution containing an ammonium salt such as ammonium carbonate and a water-soluble salt of aluminum or titanium as disclosed in JP-B-62-41171. After pouring and dispersing into the product, washing and drying the resulting cake,
Reduction firing is performed in a reducing atmosphere such as hydrogen at a temperature of about 400 to 1,000 ° C. for about 0.2 to 3 hours. Thus, the zinc oxide crystal lattice is sufficiently doped with Al ³⁺ , In ³⁺ or Ti ^4+, and has a specific surface area of ² to 100 m ² /
g, a conductive zinc oxide fine powder having a volume resistivity of 500 Ωcm or less is obtained.

The particle shape of the conductive zinc oxide fine powder to be used may be any of a spherical shape, a scale shape, a flake shape, a plate shape, a crushed shape, an irregular shape, a plate shape, a needle shape and the like.

The cosmetic of the present invention is not particularly limited, and any cosmetic may be used as long as it protects the skin from ultraviolet rays. Basic cosmetics, base makeup, Makeup cosmetics used for point makeup are particularly preferred. Specific examples include white powder, foundation, pressed powder, lipstick, blusher, eyeshadow, sun oil, sunburn cream, loose powder, milky lotion, lotion and the like.

The components of the cosmetic to which the conductive zinc oxide fine powder of the present invention is blended include components to be blended with ordinary cosmetics, for example, a base component generally used for cosmetics and a general drug effect imparting agent. Components (eg, humectants, anti-inflammatory agents, blood circulation promoters, etc.), oils, pigments, fragrances and the like are used.

For example, organic and inorganic fillers and pigments such as silica, talc, red iron oxide, clay, mica, bentonite, titanium oxide, calcium carbonate, barium sulfate, magnesium carbonate, CI Pigment Yellow, iron oxide, silk powder, nylon powder and the like. Lanolin, vaseline,
Solid or semi-solid oil such as paraffin, wax, carnauba wax, candelilla wax, ceresin, lauryl alcohol, lauric acid, cetyl alcohol; olive oil, jojoba oil, oleic acid, oleyl alcohol, isohexadecyl alcohol, dimethylpolysiloxane, liquid paraffin , Squalene, octadodecyl myristate, squalane, etc .; water-soluble polymers such as methylcellulose, carboxymethylcellulose, hydroxymethylcellulose, xanthan gum, dextrin, gelatin, sodium alginate; polyoxyethylene stearate, triethanolamine, monoolein Surfactants such as sorbitan acid, glycerin fatty acid ester, and behenyltrimethylammonium chloride; sorbitol, mannitol, Phosphoric, lactic, betaine, sodium hyaluronate, humectants such as propylene glycol, other preservatives, fragrances, pH regulators include various amino acids, fungicides,
Antioxidants and the like.

Further, the mixing ratio of the conductive zinc oxide to the cosmetic cannot be determined unconditionally because it varies depending on the type and properties of the cosmetic used, but volatile components such as water and alcohol are excluded from the components. 5% of the weight of residual ingredients on the skin (
Wt%, the same applies hereinafter. ) It is desirable to include the above. 5%
If the ratio is less than the above, the combined use of another ultraviolet absorber (ultraviolet ray shielding agent) will result in insufficient infrared transmission preventing ability even if the ultraviolet absorbing ability can be maintained. The mixing ratio is more preferably 10% to 80%, further preferably 15 to 65%, and most preferably 15 to 50%. When used in a cosmetic in an excessive amount, the feeling of use becomes worse.

In blending the conductive zinc oxide of the present invention into cosmetics, for example, a silane coupling agent, a silicone oil, a titanate coupling agent, an alcohol,
There is no problem even if surface treatment is performed with a surfactant or other known surface treatment agents or surface modifiers, as long as the properties of zinc oxide are not impaired.

In the case of a cosmetic, the conductive zinc oxide of the present invention causes no problem when used in combination with another ultraviolet absorbent as described above. Examples of such UV absorbers include organic or inorganic compounds such as titanium oxide, cerium oxide, iron oxide, benzophenone UV absorber, benzimidazole UV absorber, and benzotriazole UV absorber.

[0028]

The present invention will be described below with reference to examples. However, these are merely examples of the embodiments, and the technical scope of the present invention is not limited thereto.

(I) Preparation of Sample Cosmetic [Example 1]

(Preparation of Powdery Foundation) A conductive zinc oxide having a specific surface area of 10 m ² / g and a volume resistivity of 90 Ωcm (manufactured by Hakusuitek Co., Ltd .: conductive zinc oxide 23-K) was used.

Powder components of 50 parts of conductive zinc oxide, 10 parts of talc, 10 parts of mica, 1 part of red iron oxide, 3 parts of yellow iron oxide, 0.2 parts of black iron oxide and 10 parts of nylon powder are mixed by a mixer. , To obtain a mixed powder.

To this mixed powder, 5 parts of liquid paraffin, 6 parts of squalane, 2 parts of octyldodecyl myristate, 2 parts of neopentyl glycol diisooctanoate, 0.8 parts of sorbitan monooleate and an appropriate amount of flavor are added, and the mixture is thoroughly stirred and mixed. A powdery foundation was produced. The content of the conductive zinc oxide in the foundation was 50% by weight as a residual component on the skin excluding volatile components.

[Comparative Example 1] Zinc oxide having a specific surface area of 1
0 m ² / g, volume resistivity 100 MΩcm (manufactured by Hakusuiteku Co., Ltd .: Zinc oxide super 10 (SUPER-
A powdery foundation was produced in the same manner as in Example 1 except that 10))) was used. The amount of zinc oxide in the foundation was 50% by weight as a residual component on the skin excluding volatile components.

Example 2 (Preparation of Cake Foundation) Conductive zinc oxide having a specific surface area of 10 m ² / g and a volume resistivity of 90 Ωcm (Hakusui Tech Co., Ltd .: conductive zinc oxide 23)
-K) was used.

Powder components of 32 parts of conductive zinc oxide, 15 parts of talc, 16 parts of mica, 1 part of bengara, 2.8 parts of yellow iron oxide, 0.2 parts of black iron oxide and 15 parts of nylon powder are mixed in a mixer. And mixed to obtain a mixed powder.

To this mixed powder, 4 parts of POE sorbitan monooleate, 8 parts of squalane, 6 parts of silicone oil, and an appropriate amount of flavor were added, and the mixture was sufficiently stirred and mixed to produce a cake foundation. The content of the conductive zinc oxide in the cake foundation was 32% by weight as a residual component on the skin excluding volatile components.

Comparative Example 2 The specific surface area of zinc oxide was 1
0 m ² / g, volume resistivity 100 MΩcm (manufactured by Hakusuiteku Co., Ltd .: Zinc oxide super 10 (SUPER-
A cake foundation was produced in the same manner as in Example 2 except that 10))) was used. The content of zinc oxide in the cake foundation was 32% by weight as a residual component on the skin excluding volatile components.

Example 3 (Preparation of O / W emulsion type foundation)

The conductive zinc oxide has a specific surface area of 10 m ^2.
/ G, having a volume resistivity of 90 Ωcm (manufactured by Hakusui Tech Co., Ltd .: conductive zinc oxide 23-K).

Conductive zinc oxide 10 parts, Bengala 0.5
Parts, yellow iron oxide 1.4 parts, black iron oxide 0.1 part, bentonite 0.5 part, purified water 55 parts, triethanolamine 1
Parts, propylene glycol 10 parts, polyoxyethylene sorbitan monostearate 1 part, glycerin monostearate 2 parts, liquid paraffin 7.5 parts, lanolin 2
, A 2 / part of stearic acid and 7 parts of isohexadecyl alcohol were used to produce an O / W emulsified foundation according to the following procedure.

That is, first, propylene glycol in which bentonite is dispersed is added to purified water and mixed with stirring.
Further, triethanolamine and polyoxyethylene sorbitan monostearate were added and mixed. To this, a mixed powder obtained by mixing conductive zinc oxide, red iron oxide, yellow iron oxide, and black iron oxide with a mixer was added, and the mixture was treated with a homomixer.

Further, glycerin monostearate, liquid paraffin, lanolin, stearic acid and isohexadecyl alcohol were added, and the mixture was treated with a homomixer. Finally, an appropriate amount of a flavor was added and thoroughly stirred and mixed to produce an O / W emulsion type foundation. did. The compounding amount of the conductive zinc oxide in the O / W emulsified foundation was 22% by weight as a residual component on the skin excluding volatile components.

Comparative Example 3 The specific surface area of zinc oxide was 1
0 m ² / g, volume resistivity 100 MΩcm (manufactured by Hakusuiteku Co., Ltd .: Zinc oxide super 10 (SUPER-
10) O / W in the same manner as in Example 3 except that) was used.
An emulsion type foundation was manufactured. The amount of zinc oxide in the O / W emulsion type foundation was 22% by weight as a residual component on the skin excluding volatile components.

Example 4 (Production of Conductive Zinc Oxide ) First, conductive zinc oxide was produced as follows. That is,

Reagent 30 g of primary ammonium carbonate was added to water 50
A solution of 5 g of aluminum sulfate dissolved in 50 cc of water was added to the above ammonium carbonate solution. This solution was separately placed in a dispersion prepared by dispersing 100 g of French method zinc flower in 200 cc of water.
After heating and stirring at 1 ° C. for 1 hour, the mixture was filtered and washed with water. The cake was dried and calcined in a hydrogen atmosphere at 760 ° C. for 120 minutes to obtain conductive zinc oxide.

The resulting conductive zinc oxide has a specific surface area of 2
It had a volume resistivity of 5 m ² / g and a volume resistivity of 40 Ωcm.

(Preparation of lotion) As the zinc oxide, the above-described conductive zinc oxide (having a specific surface area of 25 m ² / g and a volume resistivity of 40 Ωcm) was used.

1.6 parts of conductive zinc oxide, 0.1 parts of red iron oxide
Parts, yellow iron oxide 0.1 part, glycerin 2 parts, 1,3 butylene glycol 2 parts, propylene glycol 1 part, camphor 0.2 parts, ethanol 15 parts, purified water 78 parts, perfume appropriate amount, the following procedure Produced a lotion.

First, an organic component consisting of ethanol, glycerin, 1,3 butylene glycol, propylene glycol and a fragrance is mixed. Next, purified water, camphor, conductive zinc oxide, red iron oxide and yellow iron oxide were stirred and dispersed, and the organic mixture previously mixed was added to the dispersion and stirred to prepare a lotion. The content of the conductive zinc oxide in the lotion was 22% by weight as a residual component on the skin excluding volatile components.

Comparative Example 4 Specific surface area of zinc oxide was 3
0 m ² / g, volume resistivity 100 MΩcm (manufactured by Hakusuitek Co., Ltd .: Zinc oxide super 30 (SUPER-
A lotion was produced in the same manner as in Example 4, except that 30)) was used. The content of zinc oxide in the lotion was 22% by weight as a residual component on the skin excluding volatile components.

Example 5 (Production of Conductive Zinc Oxide ) First, conductive zinc oxide was produced as follows. That is,

Reagent 30 g of primary ammonium carbonate was added to water 50
A solution of 5 g of aluminum sulfate dissolved in 50 cc of water was added to the above ammonium carbonate solution. Separate this solution into 100 g of French zinc
Put into a dispersion prepared by dispersing in
After heating and stirring for 1 hour, the mixture was filtered and washed with water, and the cake was dried and calcined at 780 ° C. for 60 minutes in a hydrogen atmosphere to obtain conductive zinc oxide.

The obtained conductive zinc oxide has a specific surface area of 1
The volume resistivity was 8 m ² / g and the volume resistivity was 120 Ωcm.

(Preparation of Emulsion) As the zinc oxide, the above-mentioned conductive zinc oxide (having a specific surface area of 18 m ² / g and a volume resistivity of 1
20 Ωcm 2).

10 parts of conductive zinc oxide, 50 parts of purified water, 7 parts of propylene glycol, 4 parts of sorbitan sesquioleate, 1 part of POE (20) sorbitan monooleate, 15 parts of liquid paraffin, 2 parts of lanolin
, Squalane 8 parts, silicone oil 1 part and beeswax 2 parts, an emulsion was prepared by the following procedure.

First, propylene glycol and conductive zinc oxide are added to purified water, and heated to 70 ° C. and mixed. After heating and dissolving liquid paraffin, lanolin, squalane, silicone oil and beeswax, adding sorbitan sesquioleate and POE (20) sorbitan monooleate and adjusting to 70 ° C., containing the above propylene glycol and conductive zinc oxide Purified water was gradually added and emulsified to produce an emulsion. The content of the conductive zinc oxide in the emulsion was 20% by weight as a residual component on the skin excluding volatile components.

Comparative Example 5 Zinc oxide having a specific surface area of 3
0 m ² / g, volume resistivity 100 MΩcm (manufactured by Hakusuitek Co., Ltd .: Zinc oxide super 30 (SUPER-
An emulsion was prepared in the same manner as in Example 4 except that 30))) was used. The content of zinc oxide in the emulsion was 20% by weight as a residual component on the skin excluding volatile components.

Example 6 (Preparation of cream) The conductive zinc oxide has a specific surface area of 1
0 m ² / g, as the volume resistivity of 90Omucm (Hakusui Tech Co., Ltd. Conductive zinc oxide 23-K) was used.

10 parts of conductive zinc oxide, 45 parts of purified water, 2 parts of cetanol, 8 parts of glycerin, 2 parts of propylene glycol monostearate, 2 parts of stearic acid, 5 parts of silicone oil, 2 parts of lanolin, 15 parts of squalane, 15 parts of octane Using 8 parts of cetyl acid and 1 part of microcrystalline wax,
The cream was manufactured according to the following procedure.

Propylene glycol monostearate,
An oil composed of cetanol, lanolin, silicone oil, cetyl octanoate, stearic acid, squalane and microcrystalline wax was heated and mixed at 70 ° C.

After dissolving glycerin in purified water, conductive zinc oxide was stirred and mixed, and the mixture was heated to 70 ° C., and the oil mixed by heating was added and emulsified with a homomixer to prepare a cream. The amount of conductive zinc oxide in the cream is
1% by weight as residual components on the skin excluding volatile components
8%.

Comparative Example 6 The specific surface area of zinc oxide was 1
0 m ² / g, volume resistivity 100 MΩcm (manufactured by Hakusuiteku Co., Ltd .: Zinc oxide super 10 (SUPER-
An emulsion was prepared in the same manner as in Example 6 except that 10))) was used. The content of zinc oxide in the cream was 18% by weight as a residual component on the skin excluding volatile components.

(II) Evaluation of Samples Using the various cosmetics of the examples and the comparative examples prepared in (I), ultraviolet impermeability and infrared impermeability, and makeup stickiness and hot flash were measured.

UV impermeability, infrared impermeability: Among the cosmetics prepared, powdery foundation and cake foundation are applied on a PET film using a puff, and emulsified foundation, lotion, lotion, and cream are applied. , And applied to a PET film, and each was measured using a spectroscope (JASCO Corporation V-570 type).

The measurement results are summarized in Table 1 as the transmittance at each wavelength in the ultraviolet, visible, and infrared regions.

Makeup Stickiness, Hot Flashiness: i) With regard to makeup stickiness, 10 female panelists were subjected to a sensory test using the cosmetics of Examples and Comparative Examples. As a result, 8 to 10 persons judged that the example was better, ○, 5 to 7 persons judged better, Δ, and others indicated X.

Ii) Regarding the feeling of hot flashes, ten female panelists were asked to come out outdoors under the fine weather using the cosmetics of Examples and Comparative Examples, and the heat of the sensory test was heard.
As a result, ○ indicates that 8 to 10 persons were smaller in the example, Δ indicates that 5 to 7 persons were smaller, and X indicates the others. The results of the above sensory tests are shown in [Table 2].

As can be seen from the transmittance at each wavelength in Table 1, there is almost no difference in the transmittance in the visible region between the example and the comparative example in all the examples, but there is little difference in the transmittance in the ultraviolet and infrared regions. In each of the examples, it can be seen that the transmittance is lower than that of the comparative example, and the ultraviolet ray preventing effect and the infrared ray preventing effect are larger than those of the comparative example.

Further, from the results of the sensory tests shown in Table 2, the conductive zinc oxide of the present invention, which has good makeup lasting and little hot flash, was applied to all the examples, although the degree was different. The effect of mixing with the ingredients was confirmed.

[0070]

[Table 1]

[0071]

[Table 2]

[0072]

According to the present invention, it is possible to provide a cosmetic which has an ultraviolet absorbing ability blended with a conductive zinc oxide fine powder and which is excellent in makeup. The fact that the makeup collapse is small is, of course, not only an effect of preventing ultraviolet rays, but also the aesthetic role of showing the beauty, which is the original purpose of makeup, can be maintained for a long time, which is very convenient.

Continued on the front page (72) Inventor Takao Tanaka 669, Yokota, Iizuka-shi, Fukuoka F-term (reference) 4C083 AA082 AB211 AB212 AB221 AB222 AB232 AB432 AB442 AB501 AB502 AC012 AC022 AC072 AC092 AC102 AC122 AC242 AC352 AC372 AC392 AC422 AC442 AC542 AD072 AD152 AD512 AD532 CC01 CC04 CC05 CC12 DD17 DD21 DD23 DD31 DD33 EE17 FF01

Claims (3)

[Claims] 1. A cosmetic comprising a conductive zinc oxide fine powder having a specific surface area of ² to 100 m ² / g and a volume resistivity of 500 Ωcm or less. 2. The cosmetic according to claim 1, wherein the amount of the conductive zinc oxide fine powder is at least 5% by weight as a residual component on the skin excluding volatile components. 3. The cosmetic according to claim 1, wherein the conductive zinc oxide fine powder is a zinc oxide fine powder using aluminum as a conductivity-imparting component.