JP7340605B2 - cosmetics - Google Patents

Description

The present invention relates to cosmetics.

Cosmetics are used by applying them to people's skin, so they are required to be resistant to sweat and sebum from the skin, and are generally required to not leave behind oil or cause makeup to come off. In order to meet such demands, studies are being conducted to prevent makeup from fading by adding various improvements to powders used in cosmetics.

For example, there is a method of incorporating inorganic porous powders such as porous silica and porous spherical magnesium carbonate into cosmetics, but these powders absorb moisture on the skin and cause the skin to lack emollient ingredients. There is a problem that it causes dryness and itching of the skin (Patent Document 1 and Patent Document 2). In addition, organic powders such as acrylic polymers are also used as sebum adsorbents, but it is expected that materials with even better sebum adsorption ability than these sebum adsorbents will be developed.

On the other hand, zinc oxide is used as a white pigment and ultraviolet shielding material in the cosmetics field, depending on its particle size. For example, it is known that fine particle zinc oxide reacts with fatty acids in sebum to immobilize sebum and suppress the spread of sebum, thereby improving makeup longevity (Patent Document 3). However, when such fine-particle zinc oxide is blended into cosmetics, it gives a squeaky feeling and has a disadvantage of poor feel. Therefore, if zinc oxide particles with excellent texture and high sebum solidifying ability can be obtained, they will be a very useful material in the cosmetics field.

In addition, a composite powder (Patent Document 4) in which 1 part by mass of (acrylates/ethylhexyl acrylate) crosspolymer is coated with 0.2 to 2 parts by mass of zinc oxide is also known, but it has even higher sebum solidification. There is a need for powders and cosmetics that exhibit this ability.

Japanese Patent Application Publication No. 2009-137806 Japanese Patent Application Publication No. 2006-096706 Japanese Patent Application Publication No. 8-41379 Patent No. 6467100

One object of the present invention is to provide a cosmetic containing composite particles that exhibits high sebum solidifying ability.

The gist of the present invention is as follows.
[1] A cosmetic comprising composite particles in which 1 part by mass of solid spherical borosilicate particles is coated with 0.01 to 2 parts by mass of zinc oxide.
[2] The cosmetic according to [1], wherein the composite particles are coated with 0.05 to 1.5 parts by mass of zinc oxide per 1 part by mass of solid spherical borosilicate particles.

[3] The cosmetic according to [1] or [2], wherein the solid spherical borosilicate particles have an average particle diameter of 0.1 to 20 μm.
[4] The cosmetic according to any one of [1] to [3], wherein the solid spherical borosilicate particles have an average particle diameter of 5 to 15 μm.
[5] The cosmetic according to any one of [1] to [4], wherein the solid spherical borosilicate particles have an average particle diameter of 7 to 13 μm.

[6] The cosmetic according to any one of [1] to [5], wherein the zinc oxide has an average particle diameter of 10 to 200 nm.
[7] The cosmetic according to any one of [1] to [6], wherein the zinc oxide contains hydrophobized zinc oxide.
[8] The solid spherical borosilicate particles contain at least one selected from the group consisting of Na borosilicate, Ca borosilicate, Al borosilicate, borosilicate (Ca/Na), and borosilicate (Ca/Al). The cosmetic according to any one of [1] to [7], which contains seeds.
[9] The cosmetic according to any one of [1] to [8], wherein the solid spherical borosilicate particles contain borosilicate (Ca/Na).

According to the present invention, it is possible to provide a cosmetic that contains composite particles that exhibit high sebum solidifying ability, is resistant to sebum disintegration, and exhibits a high makeup-wearing effect.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments for carrying out the present invention will be described in detail below. However, the present invention is not limited to the following embodiments.

The composite particles contained in the cosmetic of the present invention are composite particles containing solid spherical borosilicate particles and zinc oxide coating the solid spherical borosilicate particles, wherein the solid spherical borosilicate particles 1 It is coated with 0.01 to 2 parts by mass of zinc oxide. Preferably, the composite particles have the form of solid spherical borosilicate particles whose surfaces are coated with zinc oxide.

The cosmetic of the present invention contains solid spherical borosilicate particles having an average particle diameter of 0.1 to 20 μm. The average particle diameter of the solid spherical borosilicate particles is preferably 0.1 μm or more, more preferably 1 μm or more, even more preferably 5 μm or more, and even more preferably 7 μm or more. Moreover, the average particle diameter of the solid spherical borosilicate particles is preferably 20 μm or less, more preferably 15 μm or less, and even more preferably 13 μm or less. Furthermore, the average particle diameter of the solid spherical borosilicate particles is preferably 1 to 20 μm, more preferably 5 to 15 μm, and even more preferably 7 to 13 μm, from the viewpoint of smoothness and long-lasting makeup. The average particle diameter of the solid spherical borosilicate particles can be measured as a number-average average particle diameter according to the shape of the powder particles using the principle of microscopy.
In solid spherical borosilicate particles, the borosilicate may be an alkali metal salt such as Na, K, an alkaline earth metal salt such as Mg, Ca, an Al salt, or a combination of these salts. Preferred are Na borosilicate, Ca borosilicate, Al borosilicate, borosilicate (Ca/Na), and borosilicate (Ca/Al), and more preferred is borosilicate (Ca/Na).
Solid spherical borosilicate particles are indicated as cosmetic labeling names (INCI names) such as borosilicate (Ca/Na) (CALCIUM SODIUM BOROSILICATE) and borosilicate (Ca/Al) (CALCIUM ALUMINUM BOROSILICATE). In the present invention, glass having any display name may be used, and it is more preferable to use borosilicate (Ca/Na).

The zinc oxide used in the composite particles of the present invention is not particularly limited as long as it can be incorporated into cosmetics. Although the shape of zinc oxide is not particularly limited, from the viewpoint of sebum solidifying ability, the average particle diameter is preferably 10 to 200 nm, more preferably 15 to 100 nm, and even more preferably 15 to 50 nm. Note that the average particle size of zinc oxide is a volume-based average particle size, and can be measured using a laser diffraction/scattering type particle size distribution analyzer.

Although untreated zinc oxide can be used as it is, it is preferable to use zinc oxide that has been subjected to hydrophobization treatment. The hydrophobizing agent is not particularly limited, and examples include dimethicone, methylhydrogenpolysiloxane, and metal soap. Among these hydrophobizing agents, it is preferable to use dimethicone. The coating amount of the hydrophobizing agent may be sufficient as long as it is sufficient to hydrophobize zinc oxide. Specifically, the mass ratio of zinc oxide to hydrophobizing agent is preferably 85:15 to 99:1, more preferably 90:10 to 98:2.

In the composite particles used in the cosmetic of the present invention, the coating amount of zinc oxide is 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, per 1 part by mass of solid spherical borosilicate particles. More preferably, the amount is 0.1 part by mass or more. Furthermore, the amount of zinc oxide coated per 1 part by mass of solid spherical borosilicate particles is 2 parts by mass or less, more preferably 1.5 parts by mass or less. Within this range, sebum solidifying ability can be further enhanced and sebum breakage can be further prevented.
The coating amount of zinc oxide is 0.01 to 2 parts by mass, more preferably 0.05 to 1.5 parts by mass, and 0.1 to 1.5 parts by mass per 1 part by mass of solid spherical borosilicate particles. part is more preferable.

Various known methods can be used to coat solid spherical borosilicate particles with zinc oxide, such as physicochemical mixed grinding method (dry method, wet method), chemical deposition method, etc. can be selected. From the viewpoint of the sebum solidifying ability of the composite particles, a dry mixing and grinding method can be preferably used.

As the composite particles of the present invention, one or more selected from the solid spherical borosilicate particles described above can be coated with zinc oxide. As the zinc oxide, untreated zinc oxide, hydrophobized zinc oxide, or a combination thereof may be used. In addition, the cosmetic of the present invention may contain one or more composite particles selected from the above-mentioned solid spherical borosilicate particles in combination with zinc oxide, alone or in combination with zinc oxide. A combination of more than one species may be used.

By containing the above-mentioned composite particles, the cosmetic of the present invention has a sebum solidifying ability and exhibits an excellent makeup-lasting effect.

The amount of composite particles added to cosmetics is preferably 0.5 to 90% by mass. If the blending amount is less than 0.5% by mass, the sebum solidifying ability of the composite particles tends to be less effectively exhibited in cosmetics. On the other hand, if more than 90% by mass of composite particles are blended, formulation tends to become difficult.

The use of the cosmetic of the present invention is not particularly limited, but from the viewpoint of its effectiveness, it can be suitably used in makeup cosmetics such as foundations, base cosmetics, and sunscreen cosmetics.

The dosage form of the cosmetic of the present invention is not particularly limited, and examples include powder cosmetics, emulsified cosmetics, and two-layer cosmetics.

The cosmetic of the present invention can be manufactured by a conventional manufacturing method.
In addition to the composite particles, the cosmetics of the present invention include water-based ingredients, humectants, oil-based ingredients, pigments, surfactants, ultraviolet absorbers, thickeners, and cosmetic ingredients that are usually added to cosmetics as needed. Ingredients, fragrances, polymeric substances, antibacterial and fungicidal agents, alcohols, powders, scrubbing agents, biologically derived components, etc. can be blended as appropriate.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the scope of the present invention is not limited thereby. In addition, the blending amount is mass % unless otherwise specified.

(composite particles)
Composite particles were obtained by mixing the core particles shown in Table 1 and zinc oxide for 2 hours using a blender. When this composite particle was observed under a microscope, it was found that the core particle was coated with zinc oxide. Note that as zinc oxide, zinc oxide treated with 5% dimethicone and having an average particle diameter of 25 nm was used.
In Table 1, the coating amount of zinc oxide is expressed as a mass percentage with respect to the total amount of core particles and zinc oxide.
Table 1 shows the average particle diameter of the core particles before coating with zinc oxide.

(Oleic acid solidification test)
(a) Weigh 5 g of oleic acid (PM810: Miyoshi Yushi Co., Ltd.) and 1 g of ion-exchanged water in a 20 mL beaker, and heat to 35-40°C on a hot plate set at 40°C.
(b) Add 0.5 g of composite particles to (a) and stir for 30 seconds using a spatula to make it homogeneous.
(c) After stirring, quickly add a stirring bar and stir with a stirrer (200 rpm). The time from the stirring start time until the gelation of oleic acid progressed and the rotation of the stirrer stopped was measured, and this was defined as the solidification time.

As shown in Table 1, it was shown that solid spherical borosilicate (Ca/Na) and zinc oxide composite particles 2 to 5 had a very fast oleic acid solidification time and exhibited high sebum solidifying ability.

Next, using the composite particles 2 shown in Table 1 and the formulation shown in Table 2, a press type foundation was prepared by a conventional method.

(Evaluation method)
Three professional evaluators of makeup cosmetics used Example 1 and Comparative Example 1 on half their faces, and evaluated the sebum breakage after 3 hours in a hot and humid room. It was evaluated based on the following criteria.

[Sebum collapse]
〇: Sebum does not easily break down.
×: Sebum easily breaks down.

As shown in Table 2, Example 1 containing Composite Particles 2 was shown to be less susceptible to sebum breakage.

Next, various cosmetics were prepared using composite particles 2 to 5 shown in Table 1 according to the following procedure.

[Example 2] Powder foundation

Production method: After mixing and homogenizing components 1 to 10, components 11 to 13 are added and kneaded by heating and melting to 75°C. After pulverizing with an atomizer and sieving, it is press-molded into a metal plate.

[Example 3] Oil-based foundation (compact type)

Manufacturing method: After mixing and homogenizing components 1 to 6, heat-dissolved components 7 to 11 are added and kneaded using a roll mill. The kneaded material is remelted, stirred slowly to bring bubbles to the surface, then cooled, poured into a container at 60° C., left to cool, and solidified.

[Example 4] Stick for stain concealment

Production method: Dissolve components 9 to 14 at 85°C, mix and homogenize components 1 to 8, and add with stirring. The mixture is ground and dispersed using a colloid mill, and after degassing, the mixture is poured into a container at 70°C and cooled.

[Example 5] O/W emulsion type foundation

Production method: 6 is dispersed in 9 and added to 10, treated with a homomixer at 70°C, then 7 and 8 are added and thoroughly stirred. Add mixed and homogenized 1 to 5 to this and mix homogeneously with a homomixer. Ingredients 11 to 15 that have been heated and dissolved at 75°C and homogenized are added, emulsified using a homomixer, and then cooled.

[Example 6] W/O emulsion type foundation

Production method: Melt and homogenize 8 to 10 by heating, add 1 to 5, and homogeneously disperse with a homomixer. Add homogeneously dissolved components 6 and 7, emulsify with a homomixer, and then cool.

[Example 7] O/W emulsified sunscreen cream

Production method: After mixing 10 to 13, homogeneously disperse using a homomixer, heat-dissolved and homogenized components 1 to 9 are added, emulsify using a homomixer, and then cool.

[Example 8] W/O emulsion type sunscreen emulsion

Production method: After heating and dissolving 1 to 10 and mixing, homogeneously disperse using a homomixer, add homogeneously dissolved 11 and 12, emulsify using a homomixer, and then cool.

Claims (10)

Contains composite particles coated with 0.01 to 2 parts by mass of zinc oxide per 1 part by mass of solid spherical borosilicate particles,
A cosmetic, wherein the solid spherical borosilicate particles have an average particle diameter of 0.1 to 20 μm, and the zinc oxide has an average particle diameter of 10 to 200 nm. The cosmetic according to claim 1, wherein the composite particles are coated with 0.05 to 1.5 parts by mass of zinc oxide per 1 part by mass of solid spherical borosilicate particles. The cosmetic according to claim 1 or 2, wherein the solid spherical borosilicate particles have an average particle diameter of 5 to 20 μm. The cosmetic according to any one of claims 1 to 3, wherein the solid spherical borosilicate particles have an average particle diameter of 5 to 15 μm. The cosmetic according to any one of claims 1 to 4, wherein the solid spherical borosilicate particles have an average particle diameter of 7 to 13 μm. The cosmetic according to any one of claims 1 to 5, wherein the zinc oxide has an average particle diameter of 10 to 100 nm. The cosmetic according to any one of claims 1 to 6, wherein the zinc oxide contains hydrophobically treated zinc oxide. The solid spherical borosilicate particles contain at least one selected from the group consisting of Na borosilicate, Ca borosilicate, Al borosilicate, borosilicate (Ca/Na), and borosilicate (Ca/Al). , the cosmetic according to any one of claims 1 to 7. The cosmetic according to any one of claims 1 to 8, wherein the solid spherical borosilicate particles contain borosilicate (Ca/Na). The cosmetic according to any one of claims 1 to 9, which is a makeup cosmetic, a base cosmetic, or a sunscreen cosmetic.