WO2024116820A1

WO2024116820A1 - Cosmetic for countering beard-shadow-like areas

Info

Publication number: WO2024116820A1
Application number: PCT/JP2023/040875
Authority: WO
Inventors: 智祐勝山; 稜哉伊藤
Original assignee: 株式会社資生堂
Priority date: 2022-11-28
Filing date: 2023-11-14
Publication date: 2024-06-06

Abstract

Provided is a cosmetic for countering beard-shadow-like areas. This cosmetic is capable of concealing a post-shaving blue appearance without producing a covered-up look.　The cosmetic material for countering beard-shadow-like areas according to the present disclosure contains at least one selected from the group consisting of red coloring materials and yellow coloring materials, and contains pigment-grade titanium dioxide particles and a pearl agent, each at less than 10 mass%.

Description

Cosmetics for treating areas with stubble

This disclosure relates to cosmetics.

In recent years, cosmetics with a variety of properties have been developed.

Patent Document 1 describes a cosmetic for shaving that contains a fatty acid and an alkali for neutralizing the fatty acid, an anionic surfactant, and a nonionic surfactant, and has a viscosity of 100 cps or less (30°C) in the system.

Patent Document 2 describes a skin color adjusting composition that makes dark areas of the skin less noticeable, which is made by blending a substance that has a color range that is complementary or close to the complementary color of the skin color to be adjusted as transmitted light, and also describes that conventional cosmetics for covering skin problems (age spots, freckles, birthmarks, hemangiomas, etc.) are formulated to hide dark areas of the skin by covering skin with these skin problems with a base that has high concealing power, such as titanium dioxide.

Japanese Patent Application Laid-Open No. 10-182381 Japanese Patent Application Laid-Open No. 08-081332

In recent years, as awareness of beauty has increased, there has been a demand for an improvement in the phenomenon in which beards, eyebrows, and other areas appear blue after shaving.

If a cosmetic with high hiding power containing pigment-grade particles such as titanium dioxide, as described in Patent Document 2, is applied to such areas that appear blue, it is possible to make the phenomenon of the blue appearance less noticeable. However, such cosmetic with high hiding power is often not preferred because it tends to give the impression that the makeup is obvious or that the makeup is unnatural.

The subject of this disclosure is therefore to provide a cosmetic product for treating areas with blue beard-like skin that is able to reduce the appearance of blueness after shaving, while still providing a minimal cosmetic feel.

<Aspect 1>
A cosmetic composition for treating areas that look like blue beard, comprising at least one selected from the group consisting of red colorants and yellow colorants, and containing less than 10% by mass of pigment-grade titanium dioxide particles and a pearling agent, respectively.
<Aspect 2>
A cosmetic preparation according to aspect 1, wherein the total content of pigment-grade particles is 10% by weight or less.
Aspect 3
3. The cosmetic preparation according to claim 1 or 2, comprising at least one selected from the group consisting of pigment-grade titanium dioxide particles and pearling agents.
<Aspect 4>
A cosmetic preparation according to any one of Aspects 1 to 3, which exhibits a maximum reflection peak in the range of more than 590 nm and not more than 770 nm in the visible light region.
<Aspect 5>
A cosmetic preparation according to any one of Aspects 1 to 3, which exhibits a maximum reflection peak in the range of more than 550 nm and not more than 590 nm in the visible light region.
<Aspect 6>
A makeup method for making a stubble-like area less noticeable, comprising applying the cosmetic composition according to Aspect 4 to the stubble-like area.
Aspect 7
A makeup method for making a stubble-like area less noticeable, comprising applying the cosmetic composition according to aspect 5 to an area surrounding the stubble-like area.

According to the present disclosure, it is possible to provide a cosmetic product for treating areas with blue beard-like features that can reduce the appearance of blueness after shaving, while still providing a minimal cosmetic feel.

FIG. 1 is a schematic cross-sectional view of a model of a beard-like part used in the simulation, which is made of black fibers resembling beard and artificial skin resembling skin. FIG. 2 is a list of simulation images of a blue beard-like area model using black fibers resembling beards and artificial skin, with the number of fibers embedded in the artificial skin (fiber density) and the depth of the fibers from the surface of the skin to the inside being changed. FIG. 3 is ^a graph showing the color coordinates of each blue-beard-like area and a non-beard area (the area surrounding the blue-beard-like area) in a graph based on the CIE 1976 (L ^* , a ^* , b*) color space, with a ^* on the x-axis and b ^* on the y-axis. FIG. 4 is an example of a graph showing the change in color coordinates when hemoglobin is applied to a blue beard-like portion of artificial skin to shift the color to red. FIG. 5 is an example of a graph showing the change in color coordinates when hemoglobin is reduced in a beardless area of the artificial skin (the area surrounding the blue beard-like area) to bring the color closer to yellow.

The following describes in detail the embodiments of the present disclosure. The present disclosure is not limited to the embodiments below, and can be modified in various ways within the scope of the invention.

The cosmetic composition for treating beard-like areas disclosed herein (sometimes simply referred to as "cosmetics") contains at least one selected from the group consisting of red colorants and yellow colorants, and the content of pigment-grade titanium dioxide particles and pearlescent agent is each less than 10% by mass.

Although not limited by the theory, the principle of action of the cosmetic product for blue beard-like areas disclosed herein, which is able to make the phenomenon of hair appearing blue after shaving less noticeable despite having a low cosmetic feel, is believed to be as follows. Note that a typical example of this phenomenon of hair appearing blue is a man's blue beard, and therefore in this disclosure, such areas that appear blue are referred to as "blue beard-like areas."

First, the inventors conducted a computer simulation to investigate why a shaved area may appear blue even when the hair has been neatly shaved. Using black fibers that mimic beards and artificial skin, they found that, as shown in Figure 2, the deeper the fibers are from the surface of the skin to the inside (the length of the fibers remaining from the surface of the skin to the inside) and the greater the proportion of fibers embedded in the artificial skin (fiber density), the more blue the area tends to appear.

Further investigation into the absorption and scattering of visible light by hair (e.g., whiskers) revealed that short-wavelength light (e.g., 450 nm) and long-wavelength light (e.g., 620 nm), especially long-wavelength light, diffuses inside the skin, and this diffused light is easily absorbed by hair (e.g., whiskers) deep within the skin.

Based on these results, as shown in Fig. 3, the color of each blue beard ^- like ^part and the color of the surrounding area of the blue beard-like part (the color of the area without beard in Fig. 3) were plotted on a graph based on the CIE 1976 (L*, a ^* , b ^* ) color space with a ^* on the x-axis and b* on the y-axis, and it was unexpectedly found that the hue of the blue beard-like part was shifted to the yellow side, not blue. In other words, it is considered that the reason why the shaved area looks blue is due to the difference between the color of each blue beard-like part shifted to the yellow side and the color of the surrounding area of the blue beard-like part without hair (e.g., beard) that is redder than the blue beard-like part, that is, the influence of the color contrast effect (color contrast effect).

The cosmetic composition disclosed herein contains at least one selected from the group consisting of red-based colorants and yellow-based colorants, and is capable of reducing the difference in color between the two regions described above and reducing the impact of the color contrast effect. It is therefore believed that the content of the pigment-grade titanium dioxide particles and pearlescent agent that contribute to hiding power can be reduced to less than 10% by mass each, reducing the feeling of makeup, while also making the phenomenon of hair appearing blue after shaving less noticeable.

Methods for reducing the color difference between the blue beard-like area and the surrounding area include, for example, a method of applying a cosmetic product adjusted to a reddish color to the blue beard-like area that has shifted toward the yellow side as shown in FIG. 4, a method of applying a cosmetic product adjusted to a yellowish color to the surrounding area of the blue beard-like area that is on the redder side of the blue beard-like area as shown in FIG. 5, and a combination of these methods.

The definitions of terms used in this disclosure are as follows:

In this disclosure, "blue beard-like" does not refer to a state in which hair (e.g., beard) is growing, but rather to a state in which, after shaving with a shaver or razor, the shaved area appears blue to the naked eye, like a man's blue beard, due to the influence of the hair remaining after shaving. Therefore, "blue beard-like" is not limited to a man's blue beard, but also includes a state in which the shaved area appears blue when, for example, body hair on the arms, legs, chest, etc., eyebrows, hair, etc. are shaved. The state in which hair appears blue when shaved tends to occur within approximately two days, one day, or half a day from immediately after shaving the hair (e.g., beard) until the hair grows back. Note that states in which the appearance of blue is due to influences other than the hair remaining after shaving, such as bruises and veins, are not included in "blue beard-like" in this disclosure.

In the present disclosure, the term "blue beard-like area" refers to an area where hair (e.g., beard) remains from the skin surface to the inside and looks like blue beard. Although there are individual or site differences in such areas, typically, for example, areas where the density of hair (e.g., beard) after shaving is 10 hairs/ ^cm2 or more, 20 hairs/ ^cm2 or more, or 30 hairs/ ^cm2 or more, and/or areas where the depth of hair (e.g., beard) after shaving (the length of hair remaining from the skin surface to the inside) is 0.1 mm or more, 0.3 mm or more, or 0.5 mm or more on average.

In the present disclosure, the term "region surrounding the beard-like portion" refers to a region located around the beard-like portion, for example, within 5 cm, 3 cm, 1 cm, or 0.5 cm from the edge of the beard-like portion, and that does not look like a beard. Typically, such a region may refer to a region where no hair (e.g., whiskers) is present, or a region where the density of hair (e.g., whiskers) is lower than ^that of the beard-like portion (e.g., a region where the density of hair (e.g., whiskers) is less than that of ^the beard-like portion (e.g., a region where the density of hair (e.g., whiskers) is less than that of the beard- ^like portion) and/or a region where the depth of hair (e.g., whiskers) remaining inside the skin surface after shaving is shallow (e.g., a region where the average depth is less than 0.1 mm, 0.08 mm, or 0.05 mm).

In this disclosure, the term "coloring material" refers to a material that exhibits a color other than white and can cause cosmetics to develop color.

In this disclosure, "pigment-grade" is intended to mean a size that can function as a pigment. Pigment-grade particles can be distinguished from particles other than pigment-grade particles, for example, by their size. For example, the size of pigment-grade particles can be defined by the average particle size calculated by static light scattering, and such a size can be, for example, 100 nm or more, 150 nm or more, 200 nm or more, 250 nm or more, 300 nm or more, 350 nm or more, or 400 nm or more, and can be 800 nm or less, 700 nm or less, 600 nm or less, 500 nm or less, 400 nm or less, or 300 nm or less. Therefore, for example, even if the titanium dioxide particles are the same type, titanium dioxide with an average particle size of 300 nm can be treated as pigment-grade particles, and titanium dioxide with an average particle size of 80 nm can be treated as ultraviolet scattering particles.

In this disclosure, "visible light region" refers to the range of 380 to 780 nm.

<Cosmetics for treating areas with blue beard-like skin>
The cosmetic of the present disclosure contains at least one selected from the group consisting of red-based coloring materials and yellow-based coloring materials. By including such coloring materials, the cosmetic of the present disclosure can exhibit a reddish or yellowish color. From the viewpoint of making the blue beard-like region less noticeable, a cosmetic exhibiting a reddish color, i.e., a cosmetic exhibiting a maximum reflection peak in the range of more than 590 nm and not more than 780 nm in the visible light region, is preferably applied to the blue beard-like region, and a cosmetic exhibiting a yellowish color, i.e., a cosmetic exhibiting a maximum reflection peak in the range of more than 550 nm and not more than 590 nm in the visible light region, is preferably applied to the surrounding area of the blue beard-like region.

<Red colorants>
The red coloring material is a coloring material that can cause a cosmetic to develop a red color, and can be used alone or in combination of two or more kinds. There is no particular limit to such a coloring material, and examples thereof include coloring materials that exhibit a maximum reflection peak in the range of more than 590 nm and not more than 780 nm in the visible light region, and coloring materials that can cause a cosmetic containing only red coloring materials to exhibit a maximum reflection peak in the range of more than 590 nm and not more than 780 nm in the visible light region. There is no particular limit to the material of the coloring material that has or can exhibit such a performance, and examples thereof include materials generally referred to as inorganic pigments, organic pigments, dyes, and colorants. The red coloring material (e.g., inorganic pigments) may be subjected to a surface treatment such as hydrophobization treatment.

Examples of inorganic pigments (inorganic pigment-class particles) that can be used as red colorants include red iron oxide (red iron oxide) and inorganic brown pigments (e.g., gamma iron oxide, etc.).

Examples of organic pigments (organic pigment-class particles) that can be used as red colorants include Red No. 201, Red No. 202, Red No. 203, Red No. 204, Red No. 205, Red No. 206, Red No. 207, Red No. 208, Red No. 214, Red No. 215, Red No. 219, Red No. 220, Red No. 221, Red No. 228, Red No. 230, Red No. 231, Red No. 232, Red No. 404, Red No. 405, Red No. 502, Red No. 504, and Red No. 505.

Dyes that can be used as red colorants include, for example, Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 106, Red No. 213, Red No. 218, Red No. 223, Red No. 225, Red No. 226, Red No. 227, Red No. 401, Red No. 501, Red No. 503, and Red No. 506.

Examples of pigments that can be used as red colorants include β-carotene, cochineal pigment, red cabbage pigment, and canthaxanthin.

The content of the red-based coloring material can be appropriately set depending on the state of the blue-beard-like area and its surrounding area (e.g., the thickness of the blue-beard), the color development of the coloring material, etc. The content can be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, 1.0% by mass or more, 1.5% by mass or more, or 2.0% by mass or more, relative to the total amount of the cosmetic. There is no particular limit to the upper limit of the content of the red-based coloring material, and it can be, for example, less than 10% by mass, 8.0% by mass or less, 5.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, 1.5% by mass or less, or 1.0% by mass or less. When the red-based coloring material is a pigment-grade particle capable of exhibiting hiding properties, it is preferable that the upper limit of the coloring material is in such a range from the viewpoint of reducing the feeling of makeup.

<Yellow colorants>
The yellow coloring material is a coloring material that can cause a cosmetic to develop a yellow color, and can be used alone or in combination of two or more kinds. There is no particular limit to such a coloring material, and examples thereof include coloring materials that exhibit a maximum reflection peak in the range of more than 550 nm and not more than 590 nm in the visible light region, and coloring materials that can cause a cosmetic containing only yellow coloring materials to exhibit a maximum reflection peak in the range of more than 550 nm and not more than 590 nm in the visible light region. There is no particular limit to the material of the coloring material that has or can exhibit such a performance, and examples thereof include materials generally referred to as inorganic pigments, organic pigments, dyes, and colorants. Surface treatment such as hydrophobization treatment may be applied to the yellow coloring material (e.g., inorganic pigments).

Examples of inorganic pigments that can be used as yellow colorants include yellow iron oxide (yellow iron oxide) and yellow ocher.

Examples of organic pigments that can be used as yellow colorants include Yellow No. 201, Yellow No. 205, Yellow No. 401, Yellow No. 402, Yellow No. 404, and Yellow No. 405.

Dyes that can be used as yellow colorants include, for example, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Yellow No. 204, Yellow No. 403 (1), Yellow No. 406, and Yellow No. 407.

Examples of pigments that can be used as yellow colorants include riboflavin, crocin, anthraquinone, and safflower pigment.

The content of the yellow colorant can be appropriately set depending on the state of the blue beard-like area and the surrounding area (e.g., the thickness of the blue beard), the color development of the colorant, etc. The content can be, for example, 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, 1.0% by mass or more, 1.5% by mass or more, or 2.0% by mass or more, relative to the total amount of the cosmetic. There is no particular limit to the upper limit of the content of the yellow colorant, and it can be, for example, less than 10% by mass, 8.0% by mass or less, 5.0% by mass or less, 3.0% by mass or less, 2.0% by mass or less, 1.5% by mass or less, or 1.0% by mass or less. When the yellow colorant is a pigment-grade particle capable of exhibiting hiding properties, it is preferable that the upper limit of the colorant is in such a range from the viewpoint of reducing the feeling of makeup.

<Other colorants>
The cosmetic composition of the present disclosure may contain other coloring materials as long as they do not adversely affect the effects of the present invention. The other coloring materials may be used alone or in combination of two or more kinds, and the other coloring materials may also be subjected to surface treatment such as hydrophobization treatment. An example of the other coloring materials is shown below.

Other examples of inorganic pigments that can be used as colorants include 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, chromium hydroxide, cobalt titanate, etc.), inorganic blue pigments (e.g., ultramarine, Prussian blue, etc.), inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.), and metal powders (e.g., aluminum, gold, silver, copper, etc.).

Other organic pigments that can be used as colorants include, for example, Orange No. 201, Blue No. 404, and Green No. 202.

Other dyes that can be used as coloring materials include, for example, Orange No. 205, Orange No. 401, Blue No. 1, Green No. 3, Green No. 201, Green No. 204, and Purple No. 201.

The content of the other coloring materials is not particularly limited as long as the cosmetic develops the desired reddish or yellowish color, and can be, for example, in the range of 3.0 mass% or less, 2.0 mass% or less, 1.0 mass% or less, 0.5 mass% or less, 0.1 mass% or less, 0.05 mass% or less, or 0.01 mass% or less relative to the total amount of the cosmetic. There is no particular lower limit for the content of the other coloring materials, and can be, for example, 0 mass% or more or more than 0 mass%.

<Pigment-grade titanium dioxide particles>
The cosmetic composition for treating beard-like areas according to the present disclosure contains less than 10% by mass of pigment-grade titanium dioxide particles and a pearlescent agent, which will be described later. Because these materials are contained in such ranges, the cosmetic composition according to the present disclosure can reduce the feeling of makeup after application to the skin.

Pigment-grade titanium dioxide particles are also known as white pigments, and in the field of cosmetics, they are often used to impart hiding power to cosmetics. In the case of cosmetics for covering skin troubles (age spots, freckles, birthmarks, hemangiomas, etc.), such as those described in Patent Document 2, pigment-grade titanium dioxide particles with excellent hiding power are contained in high concentrations in the cosmetics.

The cosmetic composition of the present disclosure may also contain pigment-grade titanium dioxide particles, but in contrast to the cosmetic composition described in Patent Document 2, the cosmetic composition of the present disclosure may have a reduced content of pigment-grade titanium dioxide particles of less than 10% by mass.

The content of pigment-grade titanium dioxide particles in the cosmetic composition of the present disclosure can further be 9.5% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, less than 4.0% by mass, 3.5% by mass or less, 3.0% by mass or less, 2.0% by mass or less, 1.5% by mass or less, or 1.0% by mass or less. There is no particular restriction on the lower limit of such content, and it can be, for example, 0% by mass or more or more than 0% by mass.

<Pearling agent>
The cosmetic composition of the present disclosure has a pearling agent content of less than 10% by mass. If the pearling agent is contained at a high concentration of 10% by mass or more, hiding power is exerted and brilliance is increased, which tends to enhance the cosmetic feel.

The cosmetic composition described in Patent Document 2 contains 10% by mass or more of a substance (filtering substance) that is equivalent to a pearlescent agent and has a color range that is complementary or close to the complementary color of the skin color to be adjusted as transmitted light. In contrast, the cosmetic composition disclosed herein contains a pearlescent agent that is low at less than 10% by mass, yet is still effective in making dark beard-like areas that resemble skin troubles less noticeable.

The content of the pearling agent in the cosmetic composition of the present disclosure can further be 9.5% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, less than 4.0% by mass, 3.5% by mass or less, 3.0% by mass or less, 2.0% by mass or less, 1.5% by mass or less, or 1.0% by mass or less. There is no particular limit to the lower limit of such content, and it can be, for example, 0% by mass or more or more than 0% by mass.

The cosmetic composition of the present disclosure may contain a pearling agent (sometimes referred to as a "lustrous pigment"). The pearling agent may be used alone or in combination of two or more types. The pearling agent may be subjected to a surface treatment such as a hydrophobic treatment.

　There are no particular limitations on the pearlescent agents that can be used, and examples include titanium mica (titanium mica), iron oxide-coated titanium mica, carmine-coated titanium mica, carmine- and malt-coated titanium mica, iron oxide- and carmine-treated titanium mica, malt-coated titanium mica, iron oxide- and malt-coated 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, iron oxide-coated titanium oxide such as red ocher titanium oxide-coated mica, which is mica coated with iron oxide and titanium oxide, and hollow titanium oxide powder with silica sandwiched between the mica and titanium oxide coating layer.

As the pearling agent, a colorless pearling agent can also be used. As such a pearling agent, a known transparent pearling agent (transparent luster pigment) can be used. For example, a pearling agent can be used in which a coating made of a high refractive index material such as titanium dioxide is formed on the surface of glass particles as a base material.

If the pearling agent has the ability to cause the cosmetic to develop a red or yellow color, like the red and yellow coloring agents described above, such pearling agents can be treated as red and yellow coloring agents within the prescribed range of less than 10% by mass of the total amount of the cosmetic. In addition, if the size of the pearling agent corresponds to pigment-grade particles, such pearling agents can also be treated as pigment-grade particles.

<Total content of pigment-grade particles>
In some embodiments, the cosmetic composition of the present disclosure may have a total content of pigment-grade particles of 10% by mass or less. Pigment-grade particles other than pigment-grade titanium dioxide particles generally tend to have inferior hiding power compared to pigment-grade titanium dioxide particles. Therefore, the cosmetic composition of the present disclosure may contain other pigment-grade particles other than pigment-grade titanium dioxide particles alone or in combination of two or more kinds. In this case, if the total content of pigment-grade particles in the cosmetic composition is 10% by mass or less, the cosmetic feel after application of the cosmetic composition to the skin can be further reduced.

From the viewpoint of further reducing the feeling of makeup after applying the cosmetic to the skin, the total content of pigment-grade particles including pigment-grade titanium dioxide particles can be 9.5% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, less than 4.0% by mass, 3.5% by mass or less, 3.0% by mass or less, 2.0% by mass or less, 1.5% by mass or less, or 1.0% by mass or less, based on the total amount of the cosmetic. There is no particular limit to the lower limit of the content, and it can be, for example, 0% by mass or more or more than 0% by mass. In this way, when the amount of pigment-grade particles is small and it is difficult to sufficiently color the cosmetic in red or yellow using only the pigment-grade particles, a material other than pigment-grade particles, such as a dye or a coloring agent, can be used as a coloring material to color the cosmetic to the desired color.

<Optional ingredients>
The cosmetic of the present disclosure may be appropriately blended with various components within a range that does not adversely affect the effects of the present disclosure. Examples of various components include anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, thickeners, moisturizing agents, dispersants, water-soluble polymers, oil-soluble polymers, film-forming agents such as silicone-modified polysaccharides, sequestering agents, lower alcohols such as ethanol, polyhydric alcohols such as ethylene glycol, higher alcohols, various extracts, sugars, amino acids, organic amines, polymer emulsions, chelating agents, UV absorbers, UV scattering agents, pH adjusters, skin nutrients, vitamins, water-soluble drugs that can be used in medicines, quasi-drugs, cosmetics, etc., buffers, preservatives, antioxidants, stabilizers, propellants, organic powders, inorganic powders, water, oils, waxes, etc. Such optional components may be used alone or in combination of two or more.

<Form and shape of cosmetics>
The formulation of the cosmetic of the present disclosure is not particularly limited, and examples thereof include a single-phase system composed of an oil phase or an aqueous phase, a two-phase system composed of an oil-in-water emulsion composition or a water-in-oil emulsion composition, or a non-emulsified oil-in-water or water-in-oil two-phase formulation. Each of these formulations can be appropriately prepared by a conventional method using known materials such as oil, surfactant, and water as necessary. Here, the non-emulsified two-phase system can include a water-in-oil composition in which water droplets are forcibly dispersed in a dispersion medium containing oil by shaking a liquid in a state in which the water and oil are separated, or an oil-in-water composition in which oil droplets are forcibly dispersed in a dispersion medium containing water.

The form of the cosmetic composition disclosed herein is not particularly limited, and may be in any form, such as a solid, emulsion, cream, gel, or liquid.

<Method for adjusting the color of cosmetics for treating areas with blue beard-like skin>
The cosmetic of the present disclosure contains at least one selected from the group consisting of reddish colorants and yellowish colorants, and as a result, can exhibit a reddish or yellowish color. The degree of reddish or yellowish coloring in the cosmetic can be appropriately adjusted so that the blue beard-like portion is not noticeable, taking into consideration the state of the blue beard-like portion and/or the state of the surrounding area of the blue beard-like portion, as well as the portion to which the cosmetic is applied (the blue beard-like portion and/or the surrounding area of the blue beard-like portion). There are no particular limitations on the method of adjusting this color, and for example, the adjustment may be based on the sense of an expert who adjusts the color of the cosmetic, or the adjustment may be made by simulating an optimal color based on the color data of the color of the blue beard-like portion and the color of the surrounding area of the blue beard-like portion. An example of the method of simulating this optimal color is illustrated below.

First, a method for adjusting the color of a red cosmetic applied to a blue beard-like area will be described. A model of a blue beard-like area for simulation as shown in FIG. 1 is prepared using black fibers that mimic beard and artificial skin that mimics skin. Here, the artificial skin is not limited to the following, but for example, an artificial skin having several layer structures as shown in FIG. 1 as described in JP-A-2014-73333 can be adopted. For example, from the top of FIG. 1, the first layer of such artificial skin corresponds to the stratum corneum, the second and third layers correspond to the absorption of melanin and hemoglobin, which are representative pigment components that constitute skin color, and the fourth and subsequent layers are preferably provided with light-colored layers. FIG. 2 shows a simulation image of the prepared model of a blue beard-like area viewed from above, and for example, an image of such a troublesome blue beard-like area and its surroundings is taken. Next, a ^* and b ^* are calculated based on the average spectral reflectance of the blue beard-like area in the obtained image in accordance with the CIE 1976 (L ^* , a ^* , b ^* ) color space. Similarly, a ^* and b ^* are calculated from the average spectral reflectance in the area surrounding the whisker-like portion in accordance with the CIE 1976 (L ^* , a ^* , b ^* ) color space. Here, the colors related to a ^* and b ^* calculated from the average spectral reflectance can be said to correspond to the average color of the whisker-like portion or its surrounding area.

Based on the calculated a ^* and b ^* , the results of the blue beard-like site and its surrounding area are reflected in a graph with a ^* on the x-axis and b ^* on the y-axis. Then, as shown in FIG. 4, a straight line is drawn through the plot of the surrounding area of the blue beard-like site (the open plot without whiskers in FIG. 4) and the point of color coordinates (0,0). The color of the red cosmetic can be adjusted by simulating the optimal color of the cosmetic so that the color coordinates when the cosmetic is applied to the blue beard-like site approach this straight line (reference line). The specific adjustment of the simulated color of the red cosmetic can be appropriately performed by, for example, changing the type and amount of coloring material to be blended.

Next, a method for adjusting the color of a yellow cosmetic applied to the surrounding area of the blue beard-like part will be described. In the same manner as in the above-mentioned method for adjusting the color of a red cosmetic, the results of the blue beard-like part and its surrounding area are reflected on a graph with a ^* on the x-axis and b ^* on the y-axis based on the calculated a ^* and b ^* . Then, as shown in FIG. 5, a straight line is drawn through the plot of the blue beard-like part (plot marked with an x in FIG. 5) and the point of color coordinates (0,0). The color of the yellow cosmetic can be adjusted by simulating the optimal color of the cosmetic so that the color coordinates when the cosmetic is applied to the surrounding area of the blue beard-like part approach this straight line (reference line). The specific adjustment of the simulated color in the yellow cosmetic can also be appropriately performed by, for example, the type and amount of coloring material to be blended.

<< Makeup techniques to make blue beard-like areas less noticeable >>
The method of applying the cosmetic for blue beard-like areas of the present disclosure is not particularly limited, and examples thereof include a method of applying a cosmetic adjusted to a reddish color (i.e., a cosmetic having a maximum reflection peak in the range of more than 590 nm and not more than 780 nm in the visible light range) to a blue beard-like area shifted to the yellow side, a method of applying a cosmetic adjusted to a yellowish color (i.e., a cosmetic having a maximum reflection peak in the range of more than 550 nm and not more than 590 nm in the visible light range) to a surrounding area of the blue beard-like area that is on the redder side of the blue beard-like area, and a combination of these methods. It is most preferable to apply the cosmetic accurately to the target area (e.g., the blue beard-like area or its surrounding area), but such areas typically have individual or site differences, so it may be difficult to apply the cosmetic accurately. Therefore, the cosmetic may be applied outside the target area within a range where the phenomenon of looking blue after shaving is felt to be less noticeable to the naked eye.

The cosmetic composition of the present disclosure can make the phenomenon of hair appearing blue after shaving less noticeable simply by applying it to the areas that resemble blue beard and/or the surrounding area, but after applying the cosmetic composition of the present disclosure to the areas that resemble blue beard, etc., it is also possible to use the cosmetic composition as a base and then apply another cosmetic composition on top of the cosmetic composition that has been applied. By using another cosmetic composition in combination, the phenomenon of hair appearing blue after shaving can be made less noticeable.

<Areas to which cosmetics should be applied>
The application site of the cosmetic composition of the present disclosure is not particularly limited as long as it is a part that looks blue after shaving and/or the surrounding area. Examples of parts that look blue after shaving include shaved beard, sideburns, hair, eyebrows, etc., or shaved parts of the arms, armpits, hands, legs, feet, fingers, chest, stomach, buttocks, back, etc.

Men tend to dislike the feeling of makeup that accompanies the application of cosmetics. The cosmetic composition disclosed herein, while having a low makeup feel, can reduce the appearance of blue hair after shaving, making it suitable for use against the blue beard-like areas that are unique to men, that is, as a cosmetic composition for combating blue beard.

The present disclosure will be described in more detail below with reference to examples, but the present disclosure is not limited to these. In the following, unless otherwise specified, the blend amounts are indicated in mass %. In addition, the evaluation method shown below is not limited to the configurations of the examples, but can be similarly applied to the configurations of all the cosmetics and makeup methods described above.

The following tests were carried out using the test samples obtained by the manufacturing methods below, and the results are summarized in Table 1 and Figures 2 to 4.

Test Example 1: Examination of the mechanism of development of blue beard-like areas
In Test Example 1, the mechanism of the development of blue beard-like areas was examined. The results are shown in FIG.

<Method of producing a blue beard-like part model>
An artificial skin of about 4 cm x about 4 cm and a black fiber of about 128 μm x about 128 μm in a prismatic shape of a predetermined length, which was assumed to be a beard, were prepared. The black fiber was divided into predetermined fiber lengths and embedded in the center of the artificial skin (an area of about 2 cm x about 2 cm) at a predetermined density as shown in Figure 2 to prepare each model of a blue beard-like part. Note that the depth shown in Figure 2 is the fiber length of the black fiber, which corresponds to the depth of the fiber from the surface of the artificial skin to the inside (the length of the fiber remaining from the surface of the artificial skin to the inside).

<result>
As is clear from Figure 2, it was found that the greater the depth of the fibers from the surface of the artificial skin into the interior (the length of the fibers remaining from the surface of the artificial skin into the interior) and the greater the proportion of fibers embedded in the artificial skin (fiber density), the more blue the skin tends to appear.

Test Example 2: Color change in the blue beard-like area
In Test Example 2, the color change in the blue beard-like area was examined. The results are shown in FIG.

<Evaluation method>
The average spectral reflectance of the center of the artificial skin without the fibers assumed to be whiskers described in Test Example 1 and the blue beard-like part model prepared by embedding the fibers was obtained. Next, a ^* and b ^* were calculated from the obtained average spectral reflectance in accordance with the CIE 1976 (L ^* , a ^* , b ^* ) color space. Here, the blue beard-like part model was adopted in which the fibers were 55 fibers/ ^cm2 and the fiber length (depth of the fibers from the artificial skin surface to the inside) was changed to 0.4 mm, 1.0 mm, 1.5 mm, 2.0 mm, and 2.5 mm.

The results for the artificial skin alone not having fibers and each of the blue beard-like site models were plotted on a graph with a ^* on the x-axis and b ^* on the y-axis based on the calculated a ^* and b ^* . The color change in the blue beard-like site was evaluated from the obtained graph.

<result>
3, it was confirmed that the longer the fiber length, i.e., the stronger the tendency to appear blue, the lower the a ^* value, i.e., the shift to the yellow side. This result shows that the reason why the blue-beard-like region appears blue is not because the color of the region shifts to the blue side, but because of the difference in color between the blue-beard-like region shifted to the yellow side and the color of the region without fibers that is located redder than the blue-beard-like region (the region surrounding the blue-beard-like region), i.e., the influence of the color contrast effect.

Test Example 3: Effect of color adjustment on beard-like areas
In Test Example 3, the effect of color adjustment on a blue beard-like area was examined. The results are shown in FIG.

<Evaluation method>
A graph was created in the same manner as in Test Example 2, with a* on the x-axis and b ^* on the y-axis, using the artificial skin alone that did not have fibers assumed to be whiskers, as well as a model of a beard-like area made with fibers having a fiber length of ^2.5 mm at a fiber density of 55 fibers ^/ cm2.

When hemoglobin was added to the blue beard-like parts of the model to make them red, we visually evaluated whether the blue appearance became less noticeable.

<result>
As shown in FIG. 4, when the blue beard-like portion turns red and its color coordinates approach a straight line passing through the white plot without fibers (whiskers) and the point with the color coordinates (0,0), it was confirmed that the phenomenon of the blue appearance becomes less noticeable even when hemoglobin alone, which does not exhibit hiding properties, is used. On the other hand, it was confirmed that when the blue beard-like portion is made redder beyond the straight line, the redness of the blue beard-like portion becomes more noticeable. From this result, it was found that even when a red-based coloring material that does not exhibit hiding properties is used, the blue appearance phenomenon becomes less noticeable when the color of the blue beard-like portion, which is shifted to the yellow side, is shifted to the red side so as to approach a specific straight line obtained from a graph with a ^* on the x-axis and b ^* on the y-axis.

It should be noted that, according to these results, even if the opposite configuration is used, that is, if a yellow colorant that does not exhibit hiding properties is used, if the color of the fiber (whisker)-free region, which is shifted to the red side, is shifted to the yellow side so as to approach a predetermined straight line obtained from a graph, as shown in FIG. 5, with a ^* on the x-axis and b ^* on the y-axis, it is predicted that the bluish appearance phenomenon will similarly become less noticeable.

Test Example 4: Study of cosmetics for treating beard-like areas
In Test Example 4, cosmetics for treating areas resembling blue beard were investigated. The results are shown in Table 1. In the "effect of reducing areas resembling blue beard" in Table 1, when the cosmetic was applied to the areas resembling blue beard of a male panel after shaving, if it was felt by visual inspection that the blue beard was not noticeable, it is indicated as "passed", and if it was felt that the blue beard was noticeable, it is indicated as "failed". In addition, in the "effect of reducing the feeling of makeup" in Table 1, when the cosmetic was applied to the areas resembling blue beard of a male panel, if it was felt by visual inspection that no makeup was being applied, it is indicated as "passed", and if it was felt that makeup was being applied, it is indicated as "failed".

<Production method of cosmetics>
(Example 1 and Comparative Example 1)
According to the formulations shown in Table 1, cream-type cosmetics were prepared by a conventional method generally used in the field of foundations.

<result>
When the cosmetic composition of Comparative Example 1, which does not exhibit red color, was applied to the areas of the male panel with blue beard, no effect of reducing the appearance of blue beard was observed. On the other hand, when the cosmetic composition of Example 1, which was adjusted to exhibit a specific red color, was applied to the areas of the male panel with blue beard, it was confirmed that an effect of reducing the appearance of blue beard was achieved.

In addition, the cosmetic of Example 1 contains a small amount of pigment-grade titanium dioxide particles and pearlescent agent, less than 10% by mass, and the total amount of pigment-grade particles is also small, less than 10% by mass. Therefore, even when the cosmetic is applied to the beard, it does not feel like makeup is being applied, and a natural finish is presented.

Claims

A cosmetic preparation for treating areas that look like blue beard, which contains at least one selected from the group consisting of red colorants and yellow colorants, and contains less than 10% by mass of pigment-grade titanium dioxide particles and a pearling agent.
The cosmetic composition according to claim 1, wherein the total content of pigment-grade particles is 10% by mass or less.
The cosmetic preparation according to claim 1 or 2, which contains at least one selected from the group consisting of pigment-grade titanium dioxide particles and pearling agents.
The cosmetic material according to claim 1 or 2, which exhibits a maximum reflection peak in the range of more than 590 nm and not more than 770 nm in the visible light region.
The cosmetic material according to claim 1 or 2, which exhibits a maximum reflection peak in the range of more than 550 nm and not exceeding 590 nm in the visible light region.
A cosmetic method for making stubble-like areas less noticeable by applying the cosmetic composition according to claim 4 to the stubble-like areas.
A cosmetic method for making the stubble-like areas less noticeable, comprising applying the cosmetic composition according to claim 5 to the area surrounding the stubble-like areas.