WO2022224672A1

WO2022224672A1 - Oil-in-water emulsified cosmetic material

Info

Publication number: WO2022224672A1
Application number: PCT/JP2022/013204
Authority: WO
Inventors: 春佳西; 礼奈松井; 香代子直井
Original assignee: 株式会社資生堂
Priority date: 2021-04-21
Filing date: 2022-03-22
Publication date: 2022-10-27
Also published as: JP2022166758A; CN117062590A

Abstract

The present invention provides an oil-in-water emulsified cosmetic material that contains pigment-grade hydrophobized particles and that is capable of realizing favorable water resistance and tone-up effect.　This oil-in-water emulsified cosmetic material comprises a water-containing dispersion medium and oil droplets dispersed in said dispersion medium. The dispersion medium contains a first polyether-modified silicone having an HLB of more than 10.0 but not more than 18.0, a lower alcohol, and pigment-grade hydrophobized particles. The oil droplets contain oil and a second polyether-modified silicone having an HLB of not more than 10.0.

Description

Oil-in-water emulsified cosmetic

The present disclosure relates to oil-in-water emulsified cosmetics.

In the field of cosmetics, water-resistant oil-in-water emulsified cosmetics have been developed.

In Patent Document 1, (A) 0.05 to 2% by mass of succinoglycan, (B) one or more hydrophobic materials selected from nylon resin powder, urethane resin powder, silicone rubber powder, and silicone resin powder 0.1 to 3% by mass of a hydrophilic powder and 1 to 50% by mass of (C) a hydrophobized powder, components (A) and (B) are in the outer aqueous phase, and component (C) is in the inner oil phase. An oil-in-water emulsified cosmetic having water resistance is disclosed.

In Patent Document 2, (A) 0.1 to 10 mass% HLB (Si) of 5 to 10 polyether-modified silicone, (B) 5 to 50 mass% or less ethanol, (C) 0.01 to An oil-in-water emulsified cosmetic having water resistance is disclosed, which contains 3% by mass of a hydrophilic thickener, (D) 0.1 to 15% by mass or more of a polyol, and (E) a water-soluble whitening agent. there is

JP 2009-286748 A JP 2012-072085 A

In oil-in-water emulsified cosmetics, particles that have undergone hydrophobic treatment are generally blended into the oil phase (oil droplets). Since such hydrophobized particles have a property of easily repelling water, they may impart water resistance to cosmetics applied to the skin.

Also, for example, when relatively large-sized pigment-grade hydrophobized particles are used as the hydrophobized particles to be blended in the oil-in-water emulsified cosmetic for the purpose of expressing a tone-up effect that brightens the skin color. There is

When an oil-in-water emulsified cosmetic containing such hydrophobized particles is applied to the skin, the oil droplets containing the hydrophobized particles are in a state in which the oil is attracted by the particles, resulting in a high surface activity of the skin. It easily sticks to and stays near the skin bumps or skin grooves. As a result, oil containing hydrophobized particles (for example, pigment-grade hydrophobized particles) is difficult to apply evenly on the skin, so it may not be possible to obtain good water resistance, and uneven tone-up may occur. There were cases where it occurred.

Therefore, the subject of the present disclosure is to provide an oil-in-water emulsified cosmetic containing pigment-grade hydrophobized particles capable of exhibiting good water resistance and tone-up effect.

<Aspect 1>
An oil-in-water emulsified cosmetic comprising a dispersion medium containing water and oil droplets dispersed in the dispersion medium,
The dispersion medium contains a first polyether-modified silicone having an HLB of more than 10.0 and not more than 18.0, a lower alcohol, and pigment-grade hydrophobized particles,
The oil droplets contain oil and a second polyether-modified silicone having an HLB of 10.0 or less,
Oil-in-water emulsified cosmetic.
<Aspect 2>
The cosmetic according to aspect 1, wherein the second polyether-modified silicone is a polyether-modified silicone containing at least one selected from the group consisting of polyoxyethylene (POE) and polyoxypropylene (POP).
<Aspect 3>
The cosmetic according to aspect 1 or 2, wherein the second polyether-modified silicone is a polyether-modified silicone represented by the following formula 1:

In formula 1,
m is an integer from 50 to 1,000;
n is an integer from 1 to 40,
a is an integer from 5 to 50,
b is an integer from 5 to 50;
<Aspect 4>
4. The cosmetic material according to any one of aspects 1 to 3, wherein the pigment-grade hydrophobized particles have an average particle size of 250 nm or more.
<Aspect 5>
The cosmetic according to any one of aspects 1 to 4, wherein the lower alcohol is contained in an amount of 5.0% by mass or more relative to the total amount of the cosmetic.
<Aspect 6>
The cosmetic according to any one of aspects 1 to 5, wherein the dispersion medium further contains a water-soluble thickening agent.
<Aspect 7>
The cosmetic material according to any one of aspects 1 to 6, wherein the mass ratio of the pigment-grade hydrophobized particles to the first polyether-modified silicone is 10 or more.
<Aspect 8>
8. The cosmetic according to any one of aspects 1 to 7, wherein the absorbance integral after the water resistance test is 100% or more compared to that before the water resistance test.

According to the present disclosure, it is possible to provide an oil-in-water emulsified cosmetic containing pigment-grade hydrophobized particles capable of exhibiting good water resistance and tone-up effect.

(a) is a schematic diagram of an oil-in-water emulsified cosmetic according to one embodiment of the present disclosure, (b) is a schematic diagram when this cosmetic is applied to the skin, and (c) is a schematic diagram of the skin. 1 is a schematic diagram after water is brought into contact with a cosmetic material applied to a body. FIG. (a) is a schematic diagram of an oil-in-water emulsified cosmetic containing oil droplets containing pigment-grade hydrophobized particles, and (b) is a schematic diagram when this cosmetic is applied to the skin.

The embodiments of the present disclosure will be described in detail below. The present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the spirit of the invention.

The oil-in-water emulsified cosmetic of the present disclosure includes a dispersion medium containing water and oil droplets dispersed in this dispersion medium, and the dispersion medium has an HLB of more than 10.0 and not more than 18.0. It contains a polyether-modified silicone, a lower alcohol, and pigment-grade hydrophobized particles, and the oil droplets contain oil and a second polyether-modified silicone having an HLB of 10.0 or less.

Although not limited by the principle, it is believed that the principle of action that allows the cosmetic of the present disclosure to exhibit good water resistance and tone-up effect is as follows.

When obtaining an oil-in-water emulsified cosmetic containing hydrophobized particles, the hydrophobized particles are generally blended in the oil phase because they are hydrophobic. In addition, from the viewpoint of improving water resistance, as described in Patent Document 1, the hydrophobized particles are generally blended in the oil phase.

However, in the oil-in-water emulsified cosmetic, the present inventors have found that pigment-grade hydrophobized particles are blended in the aqueous phase together with a first polyether-modified silicone having a specific HLB value and a lower alcohol, and When the oil droplets in the cosmetic contain oil and a second polyether-modified silicone having a specific HLB value, surprisingly, the water resistance and tone-up effect are improved when such cosmetic is applied to the skin. found to do. Furthermore, the inventors have found that the water resistance and tone-up effect are further improved when the applied cosmetic is brought into contact with water.

Pigment-grade hydrophobized particles 20 of the present disclosure, as shown in FIG. It is thought that it is dispersed in the oil-in-water emulsified cosmetic by On the other hand, in the oil-in-water emulsified cosmetic containing the pigment-level hydrophobized particles in the oil phase, the pigment-level hydrophobized particles 20 are densely packed in the oil phase, as shown in FIG. I think it exists in

When an oil-in-water emulsified cosmetic containing pigment-level hydrophobized particles in the oil phase is applied to the skin, the pigment-level hydrophobized particles 20 and oil 40 are densely packed as shown in FIG. It is believed that it adsorbs and stays on the skin which is lipophilic in its state.

On the other hand, in the oil-in-water emulsified cosmetic containing the pigment-level hydrophobized particles in the aqueous phase, the first polyether-modified silicone 10 acts as a steric hindrance and separates the pigment-level hydrophobized particles 20 from each other. Therefore, when such a cosmetic is applied to the skin, as shown in FIG. Compared to type emulsified cosmetics, it is thought that it is easier to adsorb and stay on the skin evenly. As a result, since the pigment-level hydrophobized particles that contribute to water resistance and tone-up effect are evenly arranged on the skin, compared to oil-in-water emulsified cosmetics containing pigment-level hydrophobized particles in the oil phase. We believe that the water resistance and tone-up effect will improve.

In addition, when the cosmetic of the present disclosure is applied to the skin, the hydrophilic portion of the first polyether-modified silicone 10 adsorbed to the pigment-grade hydrophobized particles 20 is oriented outward, so FIG. 2, it is considered that the oil 40 is difficult to approach the pigment-grade hydrophobized particles 20 and is spaced apart. As a result, it is considered that the pigment-grade hydrophobized particles 20 and the oil 40 exist separately on the skin. Since the first polyether-modified silicone 10 has a higher HLB than the second polyether-modified silicone and is hydrophilic, water (for example, sweat) touches the cosmetics on the skin in the state of FIG. 1(b). As a result, the first polyether-modified silicone 10 adsorbed to the pigment-grade hydrophobized particles 20 is washed away with water, and the hydrophobized surfaces of the pigment-grade hydrophobized particles 20 are exposed. As a result, the pigment-level hydrophobized particles 20 and the oil 40 become more compatible, and while the particles and the oil attract each other, a uniform film containing the pigment-level hydrophobized particles 20 and the oil 40 is formed to cover the skin. Therefore, we believe that the water resistance and tone-up effect will be further improved.

On the other hand, in an oil-in-water emulsified cosmetic containing hydrophobized particles in the oil phase, the particles themselves are lipophilic, so polyether-modified silicone is not required as a dispersant for such particles. Oil droplets are formed in a state in which the particles and the oil are already familiar with each other. Then, when such a cosmetic is applied to the skin, the oil droplets containing the hydrophobized particles are relatively non-uniform in the vicinity of the ridges or sulci of the skin, which have high surface activity, as shown in FIG. 2(b). It is thought that it shows a tendency to adsorb to Moreover, unlike the case of FIG. 1(b), the particles in such a state are already contained in the oil, so even if they are brought into contact with water, a uniform film is not formed. As a result, it is believed that the oil-in-water emulsified cosmetic containing hydrophobized particles in the oil phase does not further improve the water resistance and tone-up effect even when it is brought into contact with water.

Furthermore, in some embodiments, the oil-in-water emulsified cosmetic of the present disclosure can improve the UV protection effect (SPF). It is known that pigment-grade large particles, such as pigment-grade titanium oxide particles, are primarily capable of providing protection from ultraviolet radiation (UVA) in the A range. In the case of the oil-in-water emulsified cosmetic of the present disclosure, despite the use of pigment-grade hydrophobized particles, surprisingly, it protects not only the A region but also the B region ultraviolet rays (UVB). can do. This is because, as described above, the oil-in-water emulsified cosmetic of the present disclosure has a pigment-grade It is believed that this is because the particles having the hydrophobic treatment can be arranged uniformly, thereby improving the scattering and reflecting performance of UVA and UVB.

《Oil-in-water emulsified cosmetic》
<Dispersion medium>
The dispersion medium (aqueous phase) in the oil-in-water emulsified cosmetic of the present disclosure includes water, pigment-grade hydrophobized particles, a first polyether-modified silicone having an HLB of more than 10.0 to 18.0 or less, and a lower alcohol. include.

(water)
The amount of water to be blended is not particularly limited. For example, from the viewpoint of emulsion stability, 30% by mass or more, 40% by mass or more, 50% by mass or more, 60% by mass or more, and 70% by mass of the total amount of the cosmetic. or 80% by mass or more, or 90% by mass or less, 80% by mass or less, 70% by mass or less, or 60% by mass or less.

The water that can be used in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, and for example, water used in cosmetics and quasi-drugs can be used. For example, deionized water, distilled water, ultrapure water, and tap water can be used.

(Pigment grade hydrophobized particles)
The blending amount of the pigment-grade hydrophobized particles is not particularly limited, and can be appropriately selected based on the desired effect (eg, water resistance, tone-up effect, SPF) according to the application. The blending amount of the pigment-grade hydrophobized particles may be, for example, 0.5% by mass or more, 1.0% by mass or more, or 1.5% by mass or more with respect to the total amount of the cosmetic, and It can be 15% by mass or less, 12% by mass or less, 10% by mass or less, 8.0% by mass or less, 6.0% by mass or less, or 5.0% by mass or less.

The average particle size of the pigment-grade hydrophobized particles can be appropriately selected so as to obtain the desired effect (eg, water resistance, tone-up effect, SPF) according to the application. The average particle diameter of the pigment-grade hydrophobized particles can be, for example, 250 nm or more, 300 nm or more, 350 nm or more, or 400 nm or more. Pigment-grade hydrophobized particles having an average particle diameter of 300 nm or more can suitably exhibit a tone-up effect for brightening skin color. The upper limit of the average particle size is not particularly limited, and can be, for example, 800 nm or less, 700 nm or less, or 600 nm or less. Here, the average particle size of the pigment-grade hydrophobized particles in the present disclosure and the hydrophobized fine particles of an optional component to be described later may be the size of primary particles or aggregated secondary particles. can be calculated by

The hydrophobization treatment of the pigment-grade hydrophobized particles is not particularly limited, and any treatment that modifies the surface of such particles with an organic compound to make them hydrophobic, such as methylhydrogenpolysiloxane, dimethylpolysiloxane (dimethicone), silicone-based treatment or silane-based treatment with alkylsilane or the like; fluorine-based treatment with perfluoroalkyl phosphate, perfluoroalcohol or the like; titanate-based treatment with alkyl titanate or the like; amino acid treatment with N-acylglutamic acid or the like; , lecithin treatment; metal soap treatment; fatty acid treatment; and alkyl phosphate treatment. Hydrophobic treatment can be used alone or in combination. Moreover, the hydrophobizing treatment can be carried out using a hydrophobizing agent.

Examples of silicones used as hydrophobizing agents include known silicones having hydrogen-silicon bonds such as methylhydrogenpolysiloxane (dimethicone/methicone) copolymers. In addition, triethoxysilylethylpolydimethylsiloxyethyldimethicone, triethoxysilylethylpolydimethylsiloxyethylhexyldimethicone, etc., having an alkoxy group-silicon bond as a reactive group can also be mentioned. In addition, dimethylpolysiloxane and the like can also be used.

Examples of silane-based treatment agents include silylating agents into which organic groups are introduced, and silane coupling agents, such as triethoxycaprylylsilane.

Examples of titanate-based treatment agents include titanium coupling agents such as alkyl titanates, pyrophosphate-type titanates, phosphorous acid-type titanates, and amino acid-type titanates.

The type of particles constituting the pigment-grade hydrophobized particles is not particularly limited, and can be appropriately selected so as to obtain desired effects (for example, water resistance, tone-up effect, SPF) according to the application. Examples of pigment-grade hydrophobized particles include inorganic particles, specifically inorganic oxide particles, for example, white inorganic oxide particles such as titanium oxide particles, zinc oxide particles, and cerium oxide particles ("inorganic white may be referred to as "system pigment".) and the like. In addition, inorganic particles generally classified as pearlescent agents (bright pigments) or coloring materials can also be used as the pigment-grade hydrophobized particles of the present disclosure. Organic particles can also be used as the pigmentary hydrophobized particles of the present disclosure. The pigment-grade hydrophobized particles can be used alone or in combination of two or more.

In the present disclosure, the term "pearl agent" means particles that do not contain a coloring material and exhibit luster. A pearlescent agent typically has a plate-like form such as flakes or scales. In addition, in the present disclosure, the term “coloring material” means a material that exhibits a color other than white, does not contain a pearlescent agent, and does not exhibit luster that can cause the cosmetic to develop color. For example, from the viewpoint of tone-up effect, when using a pearlescent agent, it is preferable to use it together with inorganic oxide particles such as the titanium oxide particles described above, and when using a coloring material, the above-described titanium oxide particles It is preferable to use together inorganic oxide particles such as and/or pearlescent agents.

Pearl agents include, for example, mica titanium (mica titanium), iron oxide-coated mica titanium, carmine-coated mica titanium, carmine/conjo-coated mica titanium, iron oxide/carmine-treated mica titanium, konjo-treated mica titanium, and iron oxide/conjo treatment. Titanium mica, chromium oxide-treated titanium mica, black titanium oxide-treated titanium mica, acrylic resin-coated aluminum powder, silica-coated aluminum powder, titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, titanium oxide-coated talc, colored titanium oxide-coated mica, Titanium oxide-coated synthetic mica, titanium oxide-coated silica, titanium oxide-coated alumina, titanium oxide-coated glass powder, polyethylene terephthalate/polymethyl methacrylate laminated film powder, bismuth oxychloride, fish scale foil, red iron oxide and titanium oxide coated mica Iron oxide titanium oxide-coated mica, such as titanium oxide-coated mica, and powdery hollow titanium oxide in which silica is sandwiched between mica and a titanium oxide coating layer can be mentioned. They are typically white or some other color.

A colorless pearlescent agent can also be used as the pearlescent agent. As such a pearlescent agent, a known transparent pearlescent agent (transparent luster pigment) can be used. For example, a pearlescent agent can be used in which a glass particle is used as a base material and a coating film composed of a high refractive index material such as titanium oxide is formed on the surface of the base material.

For example, an inorganic pigment can be used as the coloring material.

Examples of inorganic pigments include inorganic red pigments (e.g., iron oxide (red iron oxide), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide , ocher, etc.); inorganic black pigments (e.g., black iron oxide, low order titanium oxide, etc.); inorganic purple pigments (e.g., manganese violet, cobalt violet, etc.); inorganic green pigments (e.g., chromium oxide, hydroxide chromium, cobalt titanate, etc.); inorganic blue pigments (eg, ultramarine blue, Prussian blue, etc.); metal powders (eg, aluminum, gold, silver, copper, etc.).

(First polyether-modified silicone)
The first polyether-modified silicone can function as a dispersant for the pigment-grade hydrophobized particles. The first polyether-modified silicone can be used alone or in combination of two or more.

The first polyether-modified silicone has an HLB of more than 10.0 to 18.0 or less, and has hydrophilic performance compared to the second polyether-modified silicone described later. From the viewpoint of the uniformity of the film containing pigment-grade hydrophobized particles and oil on the skin after contact with water (sometimes simply referred to as "film uniformity"), the first polyether-modified silicone The HLB of is preferably 10.5 or more, 11.0 or more, 11.5 or more, 12.0 or more, 12.5 or more, or 13.0 or more, 17.5 or less, 17.0 or less, It is preferably 16.5 or less, 16.0 or less, 15.5 or less, or 15.0 or less. As used herein, "HLB" is generally a value indicating affinity for water and oil, a parameter known as hydrophilic-lipophilic balance. The HLB of the first polyether-modified silicone and the later-described second polyether-modified silicone can be easily determined by the Griffin method. Here, the HLB value according to the Griffin method can be obtained by the following formula 2:
HLB value = 20 × sum of formula weights of hydrophilic moieties/molecular weight Equation 2

The amount of the first polyether-modified silicone compounded is 0.01% by mass or more and 0.01% by mass or more based on the total amount of the cosmetic, from the viewpoint of the dispersibility of the pigment-grade hydrophobized particles in the aqueous phase and the uniformity of the film. 0.03 wt% or more, or 0.05 wt% or more, and 1.0 wt% or less, 0.8 wt% or less, 0.5 wt% or less, 0.3 wt% or less, or It can be 0.2% by mass or less.

From the viewpoint of the dispersibility of the pigment-level hydrophobized particles in the aqueous phase, the uniformity of the film, the UV protection effect, etc., the mass ratio of the pigment-level hydrophobized particles to the first polyether-modified silicone is, for example, It is preferably 10 or more, 12 or more, 14 or more, 15 or more, or 17 or more, and 70 or less, 65 or less, 60 or less, 55 or less, 50 or less, 45 or less, 40 or less, 35 or less, or 30 or less is preferably

The type of the first polyether-modified silicone is not particularly limited as long as it has a specific HLB. Examples include PEG-9 dimethicone, PEG-10 dimethicone, PEG-12 dimethicone, PEG-10 methyl ether dimethicone, PEG-11 methyl ether dimethicone, PEG/PPG-20/20 dimethicone, PEG/PPG-20/23 dimethicone, and PEG-17 dimethicone can be mentioned. Among them, PEG-11 methyl ether dimethicone is preferred.

(lower alcohol)
The oil-in-water emulsified cosmetic of the present disclosure contains a lower alcohol and a second polyether-modified silicone described below. When such a cosmetic is applied to the skin or the like, the lower alcohol in the cosmetic evaporates, and the cosmetic on the skin undergoes a phase inversion from an oil-in-water type to a water-in-oil type (simply referred to as “phase inversion emulsification”). There are cases.) Therefore, excellent water resistance can be exhibited.

From the viewpoint of phase inversion emulsification and accompanying water resistance, the amount of the lower alcohol blended may be 5.0% by mass or more, 8.0% by mass or more, or 10% by mass or more relative to the total amount of the cosmetic. , or 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, or 15% by mass or less.

The type of lower alcohol is not particularly limited. For example, monohydric alcohols having an alkyl group having 1 to 5 carbon atoms are preferred, and monohydric alcohols having an alkyl group having 1 to 3 carbon atoms are more preferred. preferable. Specific examples include ethanol, propanol, isopropanol, isobutyl alcohol, and t-butyl alcohol, with ethanol being preferred. A lower alcohol can be used individually or in combination of 2 or more types.

<Oil droplet>
The oil droplets as the oil phase or dispersed phase in the oil-in-water emulsified cosmetic contain an oil component and a second polyether-modified silicone having an HLB of 10.0 or less.

(oil content)
The content of oil in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited. 2.0% by mass or more, 3.0% by mass or more, 5.0% by mass or more, 7.0% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, or 30 It can be 50% by mass or less, 40% by mass or less, 30% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less.

Cosmetics having a high oil content, for example, 20% by mass or more, can be blended in the oil phase. Therefore, the UV protection effect (SPF) can be further improved.

The type of oil is not particularly limited, and for example, volatile oil and non-volatile oil can be used. An oil component can be used individually or in combination of 2 or more types. Here, "volatile" is intended to exhibit a volatile content of more than 5% when left at 105°C under atmospheric pressure for 3 hours. From the viewpoint of film uniformity, etc., the volatile content, which is a guideline for volatility, should be 10% or more, 20% or more, 40% or more, 50% or more, 60% or more, 80% or more, or 100%. is preferred. Alternatively, the boiling point at 1 atmosphere (101.325 kPa) can be used as an indicator of volatility. The boiling point is preferably 250° C. or lower, 240° C. or lower, or 230° C. or lower from the viewpoint of uniformity of the film, or It is preferably 160° C. or higher. In addition, in the present disclosure, "non-volatile" intends to exhibit a volatile content of 5% or less when left at 105°C for 3 hours.

The volatile oil is not particularly limited, and examples include volatile silicone oil and volatile hydrocarbon oil. A volatile oil can be used individually or in combination of 2 or more types.

Volatile silicone oils include, for example, volatile acyclic silicone oils and volatile cyclic silicone oils. Among these, volatile acyclic silicone oils are preferred.

As volatile acyclic silicone oils, for example, volatile linear silicone oils and volatile branched silicone oils can be used. Among these, volatile linear silicone oils are preferred.

Volatile linear silicone oils include, for example, dimethylpolysiloxane with a viscosity of 0.65 cSt (sometimes referred to as "dimethicone"), dimethylpolysiloxane with a viscosity of 1 cSt, dimethylpolysiloxane with a viscosity of 1.5 cSt, and dimethylpolysiloxane with a viscosity of 2 cSt. and low-molecular-weight linear dimethylpolysiloxane such as dimethylpolysiloxane. Among them, dimethylpolysiloxane with a viscosity of 1 cSt and dimethylpolysiloxane with a viscosity of 1.5 cSt are preferable from the viewpoint of film uniformity. Here, these viscosities are intended to be kinematic viscosities at 25°C.

Volatile branched silicone oils include, for example, low-molecular-weight branched siloxanes such as methyltrimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane.

Volatile cyclic silicone oils include, for example, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

Volatile hydrocarbon oils include, for example, heptane, isododecane, isohexadecane, and isodecane. Among them, isododecane is preferable from the viewpoint of film uniformity.

The amount of volatile oil blended in the oil is, for example, 0% by mass or more, 5% by mass or more, 10% by mass or more, 15% by mass or more, 20% by mass or more, 25% by mass or more, 30% by mass or more, based on the total oil content. It can be 90% by mass or more, 85% by mass or less, 80% by mass or less, 75% by mass or less, or 70% by mass. 65% by mass or less, 60% by mass or less, 55% by mass or less, or 50% by mass or less. The rest of the oil in this case can be non-volatile oil.

In addition to the above-mentioned volatile oils, examples of oils include oils commonly used in cosmetics, such as liquid oils, solid oils, waxes, hydrocarbon oils other than those mentioned above, silicone oils other than those mentioned above, and polar oils. can be done. When other oils (e.g., non-volatile oils) are used together with the volatile oil, after the volatile oil volatilizes, such other oils can function as a binder between the particles and the skin. Particles can be suitably immobilized. Other oil components can be used alone or in combination of two or more. Here, some UV absorbers act as oils, especially polar oils. Such ultraviolet absorbers can also be regarded as oils.

Examples of liquid oils include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, and linseed oil. , safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, sinagi oil, Japanese pear oil, jojoba oil, germ oil, and triglycerin.

Examples of solid fats and oils include cacao butter, coconut oil, horse fat, hydrogenated coconut oil, palm oil, beef tallow, mutton tallow, hydrogenated beef tallow, palm kernel oil, lard, beef bone fat, Japanese wax kernel oil, hydrogenated oil, beef Leg fat, Japanese wax, and hydrogenated castor oil.

Waxes include, for example, beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, wart wax, whale wax, montan wax, bran wax, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugarcane wax, isopropyl lanolin fatty acid, hexyl laurate, Reduced lanolin, jojoba wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin fatty acid polyethylene glycol, and POE hydrogenated lanolin alcohol ether.

Examples of hydrocarbon oils include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, and olefin oligomers.

Examples of silicone oils include linear silicones such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane (diphenylsiloxyphenyltrimethicone), and methylhydrogenpolysiloxane having a viscosity of 6 cSt or more.

As the polar oil, for example, a polar oil with an IOB of 0.10 or more can be used. Examples of such polar oils include isopropyl myristate (IOB value = 0.18), octyl palmitate (IOB value = 0.13), isopropyl palmitate (IOB value = 0.16), butyl stearate ( IOB value = 0.14), hexyl laurate (IOB value = 0.17), myristyl myristate (IOB value = 0.11), decyl oleate (IOB value = 0.11), isononyl isononanoate (IOB value = 0.20), isotridecyl isononanoate (IOB value = 0.15), cetyl ethylhexanoate (IOB value = 0.13), pentaerythrityl tetraethylhexanoate (IOB value = 0.35), diethylhexyl succinate (IOB value = 0.32), dioctyl succinate (IOB value = 0.36), glycol distearate (IOB value = 0.16), glyceryl diisostearate (IOB value = 0.29), neopentyl glycol dicaprate. (IOB value = 0.25), diisostearyl malate (IOB value = 0.28), trimethylolpropane triisostearate (IOB value = 0.16), glyceryl tri-2-ethylhexanoate (triethylhexanoin) (IOB value = 0.35), trimethylolpropane trioctanoate (IOB value = 0.33), trimethylolpropane triisostearate (IOB value = 0.16), diisobutyl adipate (IOB value = 0.46), N-lauroyl-L-glutamic acid-2-octyldodecyl ester (IOB value = 0.29), 2-hexyldecyl adipate (IOB value = 0.16), diisopropyl sebacate (IOB value = 0.40), methoxy Ethylhexyl cinnamate (IOB value = 0.28), 2-ethylhexyl palmitate (IOB value = 0.13), 2-ethylhexyl ethylhexanoate (IOB value = 0.2), triisostearin (IOB value = 0.16 ), PPG-3 dipivalate (IOB value=0.52), and tri(caprylic/capric)glyceryl (IOB value=0.33).

Examples of UV absorbers that can be regarded as oils include UV absorbers with an IOB of 0.10 or more, specifically ethylhexyl methoxycinnamate, octocrylene, polysilicone-15, t-butylmethoxydibenzoylmethane. , ethylhexyltriazon, bisethylhexyloxyphenolmethoxyphenyltriazine, hexyl diethylaminohydroxybenzoylbenzoate, oxybenzone-3, methylenebisbenzotriazolyltetramethylbutylphenol, homosalate, and ethylhexyl salicylate. be able to. These ultraviolet absorbers can be used alone or in combination of two or more.

The IOB value of the polar oil and UV absorber can be, for example, 0.11 or more, 0.12 or more, or 0.13 or more, and 0.50 or less, 0.45 or less, or 0.40 or less. can be Here, the IOB value is an abbreviation for Inorganic/Organic Balance (inorganic/organic ratio), which is a value representing the ratio of the inorganic value to the organic value, and is an index indicating the degree of polarity of an organic compound. It becomes. The IOB value is specifically expressed as IOB value=inorganic value/organic value. For each of the "inorganicity value" and the "organicity value", various The "inorganic value" and "organic value" are set according to the atom or functional group, and the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound are accumulated. (See, for example, Yoshio Koda, "Organic Conceptual Diagram-Basics and Applications-", pp. 11-17, Sankyo Publishing, 1984).

(Second polyether-modified silicone)
A second polyether-modified silicone can function as an emulsifier. The second polyether-modified silicone can be used alone or in combination of two or more.

The second polyether-modified silicone has an HLB of 10.0 or less, and has lipophilic performance compared to the above-mentioned first polyether-modified silicone. From the viewpoint of phase inversion emulsification and accompanying water resistance, the HLB of the second polyether-modified silicone is 9.0 or less, 8.0 or less, 7.0 or less, 6.0 or less, or 5.0 or less. is preferably The lower limit of HLB is not particularly limited, and can be, for example, 1.0 or more, 1.5 or more, or 2.0 or more.

From the viewpoint of phase inversion emulsification and accompanying water resistance, etc., the blending amount of the second polyether-modified silicone is 0.1% by mass or more, 0.5% by mass or more, and 1.0% by mass or more based on the total amount of the cosmetic. It can be 10% by mass or more, 1.5% by mass or more, or 2.0% by mass or more, and can be 10% by mass or less, 8.0% by mass or less, or 5.0% by mass or less. .

As the second polyether-modified silicone, for example, a polyether-modified silicone having a weight average molecular weight of 50,000 or more and containing at least one selected from the group consisting of polyoxyethylene (POE) and polyoxypropylene (POP) can be mentioned.

The weight average molecular weight of the polyether-modified silicone can be 50,000 or more, 55,000 or more, 60,000 or more, 65,000 or more, or 70,000 or more. ,000 or less, 300,000 or less, 200,000 or less, or 100,000 or less. Here, the weight average molecular weight intends the polystyrene-equivalent number average molecular weight in gel permeation chromatography measurement.

Examples of such polyether-modified silicones include polyether-modified silicones represented by the following formula 1:

In formula 1, m is an integer of 50 to 1,000, 50 or more, 70 or more, 100 or more, 120 or more, 150 or more, or 200 or more, 1,000 or less, 800 or less, 500 or less, or 300 or less A numerical range for m can be selected from among the integers of .

In formula 1, n is an integer of 1 to 40, and an integer of 1 or more, 3 or more, 5 or more, 7 or more, or 10 or more, 40 or less, 35 or less, 30 or less, 25 or less, or 20 or less A numerical range for n can be selected from.

The ratio of m to n (m:n) is preferably 200:1 to 5:1, particularly preferably 60:1 to 15:1.

In formula 1, a is an integer of 5 to 50, and an integer of 5 or more, 7 or more, or 10 or more, 50 or less, 45 or less, 40 or less, 35 or less, 30 or less, 25 or less, or 20 or less A numerical range for a can be selected from

In formula 1, b is an integer of 5 to 50, and an integer of 5 or more, 7 or more, or 10 or more, 50 or less, 45 or less, 40 or less, 35 or less, 30 or less, 25 or less, or 20 or less A numerical range for b can be selected from

The content of the polyoxyalkylene group in the molecule of Formula 1 is not particularly limited, but from the viewpoint of phase inversion emulsification, etc., the total molecular weight is preferably 20% by mass or more, 20% by mass or more, or 25% by mass or more. It is preferably 50% by mass or less, 40% by mass or less, 35% by mass or less, or 30% by mass or less.

Specific examples of the second polyether-modified silicone include, for example, PEG/PPG-19/19 dimethicone, PEG/PPG-20/22 butyl ether dimethicone, PEG/PPG-20/20 dimethicone, and PEG/PPG- Mention may be made of 30/10 dimethicone.

<Optional component>
The oil-in-water emulsified cosmetic composition of the present disclosure can be appropriately blended with various components within a range that does not affect the effects of the present disclosure. Examples of various components include additive components that can be usually blended in cosmetics, such as anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, moisturizing agents, and water-soluble thickeners. oil-soluble thickeners, water-soluble polymers, oil-soluble polymers, film-forming agents such as siliconized polysaccharides, higher fatty acids such as isostearic acid, sequestering agents, higher alcohols such as stearyl alcohol, polyhydric alcohols , various extracts, sugars, amino acids, organic amines, polymer emulsions, chelating agents, UV absorbers other than the above UV absorbers, pH adjusters, skin nutrients, vitamins, pharmaceuticals, quasi-drugs, cosmetics water-soluble agents, buffering agents, anti-fading agents, preservatives, dispersing agents, propellants, fillers, pigments other than the above pearlescent agents and pigments that can be used in coloring materials (e.g., organic pigments) , hydrophobized fine particles, dyes, pigments, fragrances, and the like. Optional components can be blended in the oil phase and/or the water phase, and can be used alone or in combination of two or more. Some of these ingredients are described below.

(Nonionic surfactant)
In some embodiments, the oil-in-water emulsified cosmetic of the present disclosure contains a nonionic surfactant.

Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyalkylene glycol fatty acid esters, POE hydrogenated castor oil derivatives, POE alkyl ethers, POE/POP alkyl ethers, PEG fatty acid esters, polyglycerin fatty acid esters. , POE glycerin fatty acid esters, and PEG glyceryl isostearate. In addition, nonionic surfactants such as polyglyceryl-2 diisostearate and sorbitan sesquiisostearate can also be used. A nonionic surfactant can be used individually or in combination of 2 or more types.

Examples of polyoxyalkylene alkyl ethers include polyoxyethylene behenyl ether and polyoxyethylene stearyl ether.

Examples of polyalkylene glycol fatty acid esters include polyethylene glycol monostearate and polyethylene glycol monooleate.

Examples of POE hydrogenated castor oil derivatives (PEG hydrogenated castor oil) include POE (20-100) hydrogenated castor oil derivatives. Specific examples include POE (20) hydrogenated castor oil derivative, POE (40) hydrogenated castor oil derivative, POE (60) hydrogenated castor oil derivative, and POE (100) hydrogenated castor oil derivative.

Examples of POE alkyl ethers include POE (2) lauryl ether, POE (4.2) lauryl ether, POE (9) lauryl ether, POE (5.5) cetyl ether, POE (7) cetyl ether, POE ( 10) Cetyl ether, POE (15) cetyl ether, POE (20) cetyl ether, POE (23) cetyl ether, POE (4) stearyl ether, POE (20) stearyl ether, POE (7) oleyl ether, POE (10) ) oleyl ether, POE (15) oleyl ether, POE (20) oleyl ether, POE (50) oleyl ether, POE (10) behenyl ether, POE (20) behenyl ether, POE (30) behenyl ether, POE (2) (C12-15) alkyl ether, POE (4) (C12-15) alkyl ether, POE (10) (C12-15) alkyl ether, POE (5) secondary alkyl ether, POE (7) secondary alkyl ether, Mention may be made of POE(9) alkyl ethers and POE(12) alkyl ethers.

Examples of POE/POP alkyl ethers include POE (1) polyoxypropylene (POP) (4) cetyl ether, POE (10) POP (4) cetyl ether, POE (20) POP (8) cetyl ether, POE (20) POP(6) decyltetradecyl ether and POE(30) POP(6) decyltetradecyl ether can be mentioned.

PEG fatty acid esters include, for example, polyethylene glycol monolaurate (hereinafter abbreviated as PEG) (10), PEG monostearate (10), PEG monostearate (25), PEG monostearate (40), monostearate Mention may be made of PEG acid (45), PEG monostearate (55), PEG monostearate (100), PEG monooleate (10), PEG distearate, and PEG diisostearate.

Examples of polyglycerol fatty acid esters include hexaglyceryl monolaurate, hexaglyceryl monomyristate, hexaglyceryl monostearate, hexaglyceryl monooleate, decaglyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monostearate, Mention may be made of decaglyceryl monoisostearate, decaglyceryl monooleate, decaglyceryl distearate, and decaglyceryl diisostearate.

Examples of POE glycerin fatty acid esters include polyoxyethylene (POE) (5) glyceryl monostearate, POE (15) glyceryl monostearate, POE (5) glyceryl monooleate, and POE (15) monooleate. Mention may be made of glyceryl.

Examples of PEG glyceryl isostearate include, for example, PEG (8) glyceryl isostearate, PEG (10) glyceryl isostearate, PEG (15) glyceryl isostearate, PEG (20) glyceryl isostearate, PEG (25) glyceryl isostearate, PEG (30) glyceryl isostearate, PEG (40) glyceryl isostearate, PEG (50) glyceryl isostearate, and PEG (60) glyceryl isostearate can be mentioned.

The content of the nonionic surfactant is not particularly limited. % by mass or more, and 3.0% by mass or less, 2.5% by mass or less, 2.0% by mass or less, 1.5% by mass or less, 1.0% by mass or less, or 0.5% by mass % by mass or less.

(Water-soluble thickener)
In some embodiments, the oil-in-water emulsified cosmetic of the present disclosure contains a water-soluble thickener. A cosmetic containing a water-soluble thickener can further improve the emulsion stability.

The water-soluble thickener is not particularly limited as long as it is used in cosmetics. Examples include natural water-soluble thickeners, semi-synthetic-type water-soluble thickeners, synthetic-type water-soluble thickeners, and inorganic water-soluble thickeners.

Natural water-soluble thickeners include, for example, gum arabic, gum tragacanth, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed (quince), algecolloid (cassou extract), starch (rice, corn, potato). , wheat) and glycyrrhizic acid; microbial polymers such as xanthan gum, dextran, succinoglucan and bullulan; and animal polymers such as collagen, casein, albumin and gelatin.

Examples of semi-synthetic water-soluble thickeners include starch-based polymers such as carboxymethyl starch and methylhydroxypropyl starch; methylcellulose, nitrocellulose, ethylcellulose, methylhydroxypropylcellulose, hydroxyethylcellulose, sodium cellulose sulfate, hydroxypropyl cellulose-based polymers such as cellulose, sodium carboxymethylcellulose (CMC), crystalline cellulose and cellulose powder; and alginic acid-based polymers such as sodium alginate and propylene glycol alginate.

Examples of synthetic type water-soluble thickeners include vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, polyvinylpyrrolidone, carboxyvinyl polymer (carbomer); polyethylene glycol (weight average molecular weight: 1,500, 4,000 , 6,000); polyoxyethylene-polyoxypropylene copolymer copolymer; sodium polyacrylate, polyethyl acrylate, polyacrylamide, alkyl acrylic acid/methacrylate copolymer acrylic polymers such as polyethylenimine, cationic polymers, and the like.

Examples of inorganic water-soluble thickeners include bentonite, AlMg silicate, laponite, hectorite, and silicic anhydride.

The blending amount of the water-soluble thickener is, for example, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, or It can be 0.2% by mass or more, and can be 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less.

(polyhydric alcohol)
In some embodiments, the oil-in-water emulsified cosmetic of the present disclosure contains polyhydric alcohol. A polyhydric alcohol can improve the transparency and stability of an oil-in-water emulsified cosmetic.

Examples of polyhydric alcohols include ethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, polybutylene glycol, and dynamite glycerin.

The blending amount of the polyhydric alcohol is, for example, 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 2.0% by mass or more, based on the total amount of the cosmetic, from the viewpoint of emulsion stability and the like. It can be 15% by mass or more, 10% by mass or less, or 7.0% by mass or less.

(Hydrophobic treated microparticles)
In some embodiments, the oil-in-water emulsified cosmetic of the present disclosure contains hydrophobized microparticles. From the viewpoint of UV protection effect, emulsion stability, etc., it is preferable to blend the hydrophobic-treated fine particles into the inner oil phase. Here, the above-described pigment-grade hydrophobized particles and hydrophobized microparticles can be distinguished by their sizes. In other words, the pigment-grade hydrophobized particles mean hydrophobized particles having a larger particle diameter than the hydrophobized fine particles.

The amount of the hydrophobized fine particles to be blended is not particularly limited, and can be appropriately selected based on the desired effect (for example, ultraviolet scattering effect) according to the application. % or more, 1.0 mass % or more, 1.5 mass % or more, 2.0 mass % or more, 2.5 mass % or more, 3.0 mass % or more, 3.5 mass % or more, 4.0 mass % 4.5% by mass or more, or 5.0% by mass or more, and 20% by mass or less, 17% by mass or less, 15% by mass or less, 13% by mass or less, 10% by mass or less, 8 .0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 3.0% by mass or less, 1.0% by mass or less, 0.5% by mass or less, or 0.1% by mass or less be able to.

For example, hydrophobized fine particles with an average particle diameter of 200 nm or less can exhibit an ultraviolet scattering effect. The average particle size of the hydrophobized fine particles can be appropriately selected based on the desired effect (for example, ultraviolet scattering effect) according to the application. Alternatively, it can be 80 nm or less. The lower limit of the average particle size of the hydrophobized fine particles is not particularly limited, but can be, for example, 10 nm or more, 20 nm or more, 30 nm or more, 40 nm or more, 50 nm or more, 60 nm or more, or 70 nm or more.

The hydrophobization treatment of the hydrophobized fine particles is not particularly limited, and for example, the same hydrophobization treatment as the above-described pigment-grade hydrophobized particles can be performed.

The type of particles constituting the hydrophobized fine particles is not particularly limited, and can be appropriately selected based on the desired effect (for example, ultraviolet scattering effect) according to the application. Titanium oxide, zinc oxide, barium sulfate, iron oxide, talc, mica, sericite, kaolin, mica titanium, Prussian blue, chromium oxide, chromium hydroxide, silica, cerium oxide and the like. The hydrophobized microparticles can be used alone or in combination of two or more. When the hydrophobized fine particles are used as an ultraviolet scattering agent, it is preferable to use particles having a refractive index of 1.5 or more, such as zinc oxide particles and titanium oxide particles, from the viewpoint of optical properties and the like.

<Viscosity of cosmetics>
In some embodiments, the oil-in-water emulsified cosmetic of the present disclosure has a viscosity of 25,000 mPa s or less immediately after preparation of the cosmetic, which is measured using the conditions and apparatus described in the examples below. , 23,000 mPa s or less, 20,000 mPa s or less, or 19,000 mPa s or less, and 1,000 mPa s or more, 3,000 mPa s or more, 5,000 mPa s or more , 7,000 mPa·s or more, or 10,000 mPa·s or more. Such a viscosity of the cosmetic immediately after preparation can be referred to as "initial viscosity".

<Absorbance integral after water resistance test>
In some embodiments, the oil-in-water emulsified cosmetic of the present disclosure is compared with before the water resistance test with respect to the absorbance integral after the water resistance test measured using the conditions and equipment described in the examples described later. , 100% or more, 102% or more, 105% or more, 107% or more, or 110% or more. The upper limit of the absorbance integral is not particularly limited, and can be, for example, 130% or less, 125% or less, or 120% or less.

The uniformity of the film after applying the cosmetic to the skin, etc., and making it contact with water can be indirectly defined by the absorbance integral after the water resistance test. This absorbance integral ratio is the ratio of the integrated absorbance value of the test sample after the water resistance test to the integrated absorbance value of the test sample prepared by spreading the cosmetic on a predetermined base material and drying it before the water resistance test. is. In other words, an increase in this absorbance integral ratio means that the pigment-grade hydrophobized particles are more evenly distributed on the skin after the water resistance test.

<<Method for preparing oil-in-water emulsified cosmetic>>
The method for preparing the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, and for example, it can be prepared by known methods such as a dispersion method and an aggregation method.

The dispersion method is a method of refining the aggregates of the dispersed phase by mechanical force. Specifically, it is a method of emulsifying using the crushing force of an emulsifier, and examples of such a method include a high-pressure emulsification method in which a high-pressure homogenizer is used to apply a high shearing force.

The coagulation method is a colloidal preparation method that utilizes surface chemical properties, and is a method in which a uniformly dissolved state is brought into a supersaturated state by some means to emerge as a dispersed phase. As specific methods, the HLB temperature emulsification method, the phase inversion emulsification method, the non-aqueous emulsification method, the D phase emulsification method, the liquid crystal emulsification method, and the like are known.

<<Dosage form of oil-in-water emulsified cosmetic>>
The dosage form of the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, and examples thereof include liquid, milky lotion, cream, gel, spray, and mousse. Here, in the present disclosure, "spray" can include mist type spray, aerosol type spray, and the like.

<<Uses of oil-in-water emulsified cosmetics>>
The oil-in-water emulsified cosmetic of the present disclosure can uniformly apply pigment-level hydrophobized particles to the surface of the skin, and can exhibit good water resistance, tone-up effect, and the like. Therefore, the cosmetic of the present disclosure that can exhibit such properties can be used, for example, as a cosmetic that is spread and applied to the skin or the like. The cosmetic of the present disclosure further improves water resistance and tone-up properties when it comes into contact with water (e.g., sweat). For example, it is preferably used as a cosmetic that can come into contact with sweat, saliva, rainwater, seawater, pool water). Here, cosmetics applied to the skin can also include so-called external preparations for skin.

The product form of the cosmetics of the present disclosure is not particularly limited, but for example, facial cosmetics such as lotions, beauty essences, milky lotions, and packs; makeup cosmetics such as foundations, lipsticks, and eye shadows; body cosmetics; hair cosmetics such as hair liquids, hair tonics, hair conditioners, shampoos, rinses and hair restorers; and ointments. Among them, the cosmetics of the present disclosure are sunscreen cosmetics (sunscreen agents) that may receive water in a pool or the sea after being applied to the skin, or water such as sweat or saliva adheres. It can be suitably used as facial cosmetics, makeup cosmetics, or body cosmetics that may be used.

The oil-in-water emulsified cosmetic of the present disclosure will be described in more detail below with reference to examples, but the cosmetic of the present disclosure is not limited to these. Hereinafter, unless otherwise specified, the compounding amount is indicated by mass %.

<<Examples 1 to 6 and Comparative Examples 1 to 6>>
The formulations shown in Table 1 and the oil-in-water emulsified cosmetics obtained by the production methods shown below were subjected to the following evaluations, and the results are shown in Table 1. Here, "O / W (aqueous phase)" in the table means an oil-in-water emulsified cosmetic containing pigment-grade hydrophobized particles in the aqueous phase, and "O / W" means particles is intended for an oil-in-water emulsified cosmetic that does not contain .

<Evaluation method>
(Evaluation of tone-up)
The prepared cosmetic was applied to the arm, the water was dried, and the cosmetic-applied surface was visually observed to evaluate the tone-up state according to the following criteria. Here, the A evaluation can be regarded as a pass, and the B to C evaluations can be regarded as a fail. In addition to the tone-up effect, this tone-up test can indirectly evaluate whether or not the pigment-grade hydrophobized particles are evenly applied to the skin surface. That is, it can be said that the pigment-grade hydrophobized particles are uniformly applied to the skin surface in the order of C, B, and A.

A: There was no unevenness in brightness, and an excellent tone-up effect was exhibited.
B: There was slight unevenness in brightness, and a good tone-up effect was not obtained.
C: Clear unevenness in brightness occurred, and a good tone-up effect was not obtained.

(Absorbance integral after water resistance test)
A measurement plate (S plate) (5 × 5 cm V-groove PMMA plate, SPF MASTER (trademark) PA01, manufactured by Shiseido Co., Ltd.) was dropped with the prepared cosmetic in an amount of 2 mg/cm ² and applied with a finger for 60 seconds. After drying for 15 minutes, the absorbance in the wavelength range of 280 to 400 nm was measured with a U-3500 self-recording spectrophotometer manufactured by Hitachi, Ltd. Glycerin, which does not absorb ultraviolet rays, was used as a control, and the absorbance was calculated from the following equation 3. where T in equation 3 means the transmittance of the sample and T ₀ means the transmittance of glycerin:
Absorbance = -log (T/T ₀ ) ... Equation 3

The measured plate was fully immersed in water with a hardness of 50 to 500, and stirred in water for 30 minutes at 300 rpm using a three-one motor. Then, it was dried for about 15 to 30 minutes until water droplets on the surface disappeared, and the absorbance was measured again. The absorbance integral rate (also referred to as "absorbance change rate") was calculated from the integrated value (total value) of the absorbance before and after the water bath using the following equation 4. Here, when the absorbance integral ratio is 100% or more, the performance after the water resistance test is equal to or higher than before the water resistance test, so it can be said that the water resistance is excellent:
Absorbance integral ratio (%) = integrated value of absorbance after water bathing × 100/integrated value of absorbance before water bathing Equation 4

(Boost property: UV protection effect)
The absorbance integral after the above water resistance test is the result of measurement in the range of 280-400 nm, which corresponds to the range of UVA-UVB. Based on the measurement results, the improvement (boost property) of the UV protection effect was evaluated according to the following criteria. Here, evaluations A to C can be regarded as pass, and evaluation D can be regarded as fail. In addition to the UV protection effect, the result of this boosting property can indirectly evaluate whether or not the pigment-level hydrophobized particles are evenly applied to the skin surface. That is, it can be said that the pigment-grade hydrophobized particles are uniformly applied to the skin surface in the order of D, C, B, and A.

A: The absorbance integral ratio was 110% or more.
B: The absorbance integral ratio was 105% or more and less than 110%.
C: The absorbance integral rate was 100% or more and less than 105%.
D: The absorbance integral was less than 100%.

(Evaluation of particle dispersibility)
The prepared cosmetic was placed in a 50 mL transparent sample tube (3 cm in diameter) and stored at 25° C. for 7 days.

A: No sediment of pigment-grade hydrophobized particles was observed.
B: A very small amount of sediment of pigment-grade hydrophobized particles was observed.
C: Slight sedimentation of pigment-grade hydrophobized particles was observed.
D: Sediments of pigment-grade hydrophobized particles were clearly observed.

(Rolling stability evaluation)
The prepared cosmetic was placed in a 50 mL transparent sample tube (3 cm in diameter), the sample tube was rotated at a speed of 45 rpm for 4 hours in an atmosphere of 25°C, and the state of aggregation of the pigment-grade hydrophobized particles was visually observed. Evaluation was made according to the following criteria.

A: No color streaks associated with aggregates of pigment-grade hydrophobized particles were observed.
B: A very slight color stripe pattern was observed due to aggregates of pigment-grade hydrophobized particles.
C: Color streaks due to aggregates of pigment-grade hydrophobized particles were slightly observed.
D: Color stripes were clearly observed due to aggregates of pigment-grade hydrophobized particles.

(Evaluation of viscosity)
The viscosity immediately after preparation of the cosmetic was evaluated using a Brookfield viscometer (TVB viscometer TVB-10, manufactured by Toki Sangyo Co., Ltd.) under the conditions of rotor number 4, 30° C., and 12 rpm.

<Method for producing cosmetics>
Using the formulations shown in Table 1, oil-in-water emulsified cosmetics were produced by the following method. Here, the numbers shown below correspond to the numbers on the left side of Table 1 indicating the ingredient names of the formulations.

(Example 1)
No. A part of the ion-exchanged water of No. 1 is added. 2 to No. 12 ingredients were added and mixed uniformly to obtain a water phase part.

　No. 20 to No. 25 materials were uniformly mixed to obtain an oil phase part.

　No. No. 1 is added to the remaining ion-exchanged water of No. 1. 13, No. 16 and no. A powder part was obtained by uniformly mixing 17 materials.

After gradually adding the oil phase part to the water phase part, the powder part was gradually added and uniformly dispersed with a homomixer to obtain an oil-in-water emulsified cosmetic of Example 1.

(Examples 2-5 and Comparative Examples 2-5)
Oil-in-water emulsified cosmetics of Examples 2 to 5 and Comparative Examples 2 to 5 were obtained in the same manner as in Example 1, except that the formulations shown in Table 1 were changed.

(Comparative example 1)
An oil-in-water emulsified cosmetic of Comparative Example 1 was obtained in the same manner as in Example 1, except that the formulation shown in Table 1 was changed and the powder parts were not used.

(Comparative Example 6)
No. No. 1 ion-exchanged water, no. 2 to No. 12 ingredients were added and mixed uniformly to obtain a water phase part.

　No. 20 to No. The 26 materials were uniformly mixed to obtain an oil phase part.

No. for oil phase parts 27 ingredients were gradually added to prepare a mixture. Next, this mixed liquid was gradually added to the water phase part and uniformly dispersed with a homomixer to obtain an oil-in-water emulsified cosmetic of Comparative Example 6.

<result>
From the results in Table 1, it was confirmed that the oil-in-water emulsified cosmetics of Examples 1 to 5 having the structure of the present disclosure containing pigment-grade hydrophobized particles in the water phase were excellent in tone-up properties and water resistance.

The absorbance integral ratios after the water resistance test of the cosmetic of Comparative Example 1, which did not contain the pigment-level hydrophobized particles, and the cosmetic containing the pigment-level hydrophobized particles in the oil phase were 97% and 99%, respectively. It has a relatively good result in terms of water resistance. This is probably because these cosmetics also use a lower alcohol and a second polyether-modified silicone, and exhibit phase inversion emulsification that contributes to water resistance after application to the skin. Therefore, if the lower alcohol is not used, or if another emulsifier that does not undergo phase inversion emulsification is used in place of the second polyether-modified silicone, it is expected that the water resistance will deteriorate.

Looking at the results of the absorbance integral ratio after the water resistance test in Comparative Examples 1, 5, and 6, it was found that the pigment-grade particles were not used, and the pigment-grade particles that were not hydrophobized were added to the aqueous phase. or when pigment-grade hydrophobized particles are blended in the oil phase, even if water is applied to the cosmetic, the boosting property is improved, that is, the UV protection effect is increased. was not confirmed. On the other hand, in the case of the oil-in-water emulsified cosmetics of Examples 1 to 5, it was confirmed that the application of water to the cosmetics improved the boosting property.

In addition, it was found that the oil-in-water emulsified cosmetics of Examples 1 to 5 are also excellent in rolling stability and particle dispersibility.

10 first polyether-modified silicone 20 pigment-grade hydrophobized particles 30 water 40 oil

Claims

An oil-in-water emulsified cosmetic comprising a dispersion medium containing water and oil droplets dispersed in the dispersion medium,
The dispersion medium contains a first polyether-modified silicone having an HLB of more than 10.0 and not more than 18.0, a lower alcohol, and pigment-grade hydrophobized particles,
The oil droplets contain oil and a second polyether-modified silicone having an HLB of 10.0 or less,
Oil-in-water emulsified cosmetic.
The cosmetic according to claim 1, wherein the second polyether-modified silicone is a polyether-modified silicone containing at least one selected from the group consisting of polyoxyethylene (POE) and polyoxypropylene (POP).
The cosmetic according to claim 1 or 2, wherein the second polyether-modified silicone is a polyether-modified silicone represented by the following formula 1:

In formula 1,
m is an integer from 50 to 1,000;
n is an integer from 1 to 40,
a is an integer from 5 to 50,
b is an integer from 5 to 50;
The cosmetic material according to any one of claims 1 to 3, wherein the pigment-grade hydrophobized particles have an average particle size of 250 nm or more.
The cosmetic according to any one of claims 1 to 4, wherein the lower alcohol is contained in an amount of 5.0% by mass or more relative to the total amount of the cosmetic.
The cosmetic material according to any one of claims 1 to 5, wherein the dispersion medium further contains a water-soluble thickening agent.
The cosmetic material according to any one of claims 1 to 6, wherein the mass ratio of said pigment-grade hydrophobized particles to said first polyether-modified silicone is 10 or more.
The cosmetic according to any one of claims 1 to 7, wherein the absorbance integral after the water resistance test is 100% or more compared to before the water resistance test.