JP7847738B2 - Powdered solid cosmetics - Google Patents

Description

This invention relates to powdered solid cosmetic materials.

Compressed powder cosmetics such as foundations contain a high amount of powder, providing excellent coverage by concealing blemishes, freckles, wrinkles, pores, and uneven texture. However, incorporating a large amount of powder to achieve high coverage can lead to problems such as uneven application, poor spreadability, and poor makeup longevity.

To address these challenges, powder-based cosmetics have been developed that combine a smooth, refreshing feel with excellent staying power by incorporating fluorine-treated powders (see, for example, Patent Document 1). However, while such techniques can improve uniform adhesion and spreadability during application to some extent, the fluorine treatment of the powder reduces its affinity to the skin, resulting in poor staying power and ultimately unsatisfactory results.

On the other hand, as an attempt to improve the longevity of makeup, solid powder cosmetics have been developed in which liquid oils such as trifluoropropylcyclopolysiloxane are blended into the powder (see, for example, Patent Document 2). However, with this technique, while the inclusion of liquid oils such as trifluoropropylcyclopolysiloxane makes the makeup easier to adhere to the skin and thus improves its longevity, it has the drawback of being less spreadable.

To address these conventional challenges, solid cosmetic compositions containing a liquid oil component have been developed in combination with calcium sulfate dihydrate and fluorine compound-treated powder (see, for example, Patent Document 3). However, even this attempt was insufficient to compensate for the shortcomings of each component, such as the poor durability of the cosmetic due to the fluorine compound-treated powder and the poor spreadability due to the liquid oil.

Japanese Patent Publication No. 2005-289831 Japanese Patent Publication No. 2020-132527 Japanese Patent Publication No. 2015-137228

Therefore, the present invention has been made in view of the above-mentioned prior art, and aims to provide a powdered solid cosmetic that, in addition to the effects of uniformly adhering to the skin when applied, having good spreadability and good makeup retention, exhibits functions such as making the skin appear finer after application and brightening the skin through a soft-focus effect.

In other words, the present invention provides a powder solid cosmetic composition that contains 5 to 13% by mass of a liquid oil at room temperature and is formed by compression molding, characterized in that it contains the following component A, the following component B, and the following component C, and the total amount of the above components A, B, and C is 70% by mass or more of the total amount of the cosmetic composition.
Component A: Talc Component B: Nylon-12 with an average particle size of 4.0-6.0 μm
Component C: Methyl methacrylate crosspolymer with an average particle size of 14-22 μm.

It is preferable that the ratio of the content of component A to the total amount of component B and component C (component A / (component B + component C)) is in the range of 1 to 20.

The powdered solid cosmetic composition of the present invention preferably contains the following component D.
Component D: Silica with an average particle size of 1.0 to 5.0 μm

The powdered solid cosmetic composition of the present invention preferably contains the following component E.
Component E: Stearic acid-treated titanium dioxide and/or aluminum hydroxide-treated titanium dioxide

The powdered solid cosmetic composition of the present invention, by satisfying essential constituent requirements, exhibits the effects of uniform adhesion to the skin during application, good spreadability, and long-lasting wear compared to conventional powdered solid cosmetic compositions, thereby solving problems both during and after application.

Furthermore, the powdered solid cosmetic composition of the present invention, in addition to the effects described above, exhibits the effect of making the skin appear finer after application, thus producing a particularly remarkable effect of making the skin appear even brighter through a soft-focus effect.

Embodiments of the present invention will be described below.

The powdered solid cosmetic composition of the present invention is formed by compression molding and contains a specific amount of an oil that is liquid at room temperature, and contains talc, nylon-12, and methyl methacrylate crosspolymer. In this specification, "liquid at room temperature" means a state in which it is fluid in a temperature range of 1 to 30°C. In this specification, the talc is referred to as "component A," the nylon-12 as "component B," and the methyl methacrylate crosspolymer as "component C."

The details of each component used in the powdered solid cosmetic composition of the present invention are described below.

Examples of liquid oils at room temperature in the present invention include oils and fats, hydrocarbon oils, and fatty acid ester oils, which are liquid at room temperature. These components may be used individually or in combination of two or more as appropriate.

Specific examples of the above oils and fats include, for example, olive oil, sesame oil, rice bran oil, soybean oil, rapeseed oil, castor oil, sunflower oil, grape seed oil, cottonseed oil, kukui nut oil, wheat germ oil, evening primrose oil, macadamia nut oil, meadowfoam oil, jojoba seed oil, and avocado oil.

Specific examples of the hydrocarbon oils mentioned above include, for example, α-olefin oligomers, light isoparaffins, light liquid isoparaffins, synthetic squalane, vegetable squalane, squalane, liquid isoparaffins, and liquid paraffins.

Specific examples of the above fatty acid ester oils include, for example, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyl palmitate, isocetyl palmitate, octyl stearate, cetyl octanoate, stearyl octanoate, propylene glycol dicaprylate, di(caprylic/capric acid) propylene glycol, propylene glycol dicaprate, glyceryl trioctanoate, tri(caprylic/capric acid) glyceryl, and triethylhexanoin.

In the present invention, among liquid oils at room temperature, it is preferable to use at least one selected from oils and hydrocarbon oils, and more preferable to use at least one selected from squalane, jojoba seed oil, and avocado oil, from the viewpoint of further improving the longevity of the makeup.

In the present invention, commercially available liquid oils at room temperature may be used. The commercially available liquid oils at room temperature may be single ingredients or mixed ingredients with other components, as long as the desired effect is achieved. Examples of commercially available squalane include the product names "NIKKOL Sugar Squalane" (manufactured by Nikko Chemicals Co., Ltd.) and "Oryza Squalane" (manufactured by Oryza Oil & Fat Chemical Co., Ltd.). Examples of commercially available jojoba seed oil include the product name "Jojobal (Refined Jojoba Oil)" (manufactured by Watanoha Trading Co., Ltd.). Examples of commercially available avocado oil include the product name "BIOCHEMICA AVOCADO OIL REF ORG" (manufactured by The HallStar Company).

In this invention, the content of the liquid oil at room temperature is 5% to 13% by mass of 100% by mass of the cosmetic composition, and is preferably 5% to 10% by mass from the viewpoint of further improving the longevity of the makeup. In this invention, if the amount of the liquid oil at room temperature is less than 5% by mass, the bonding between the powders becomes weak, making it difficult to compress and mold. On the other hand, if the amount of the liquid oil at room temperature exceeds 13% by mass, the bonding between the powders becomes too strong, causing caking (hardening of the surface of the formulation), which can impair adhesion to the puff and potentially hinder the effects of this invention. Note that the content of the liquid oil at room temperature is the amount converted to pure content.

[Component A]
The above component A is talc. In this invention, by using the above component A and combining it with other essential components, the powdered solid cosmetic can be uniformly applied to the skin during application, and the longevity of the makeup after application can be improved.

The amount of oil absorbed by component A of the present invention is not particularly limited as long as it can exert the desired effect. However, from the viewpoint of uniformly adhering to the skin and improving makeup longevity, the amount of oil absorbed is preferably 50 ml/100g to 80 ml/100g, and more preferably 60 ml/100g to 70 ml/100g. The amount of oil absorbed (ml/100g) is a value measured in accordance with the method described in JIS K5101.

In the present invention, component A may be a commercially available product. The commercially available component A is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. Specific examples of commercially available products include the product name "TALCO SUPERRIORE M10" (oil absorption capacity 65 ml/100 g, manufactured by Imerys Talc).

The content of component A in the present invention is not particularly limited as long as it can exert the desired effect, but from the viewpoint of uniformly adhering to the skin and improving the longevity of the makeup, it is generally preferable that it be 40% to 95% by mass, and more preferably 60% to 85% by mass, of 100% by mass of the cosmetic composition. Note that the content of component A is the amount converted to pure content.

[Component B]
Component B is nylon-12 with an average particle size of 4.0 to 6.0 μm. In this invention, by using component B and combining it with other essential components, it is possible not only to improve the spreadability on the skin during application, but also to significantly enhance the soft-focus effect by making the skin appear finer after treatment. The average particle size is the median diameter (D50) measured by laser diffraction.

In the present invention, component B may be a commercially available product. The commercially available component B is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. Specific examples of commercially available products include the product name "Gantzpearl GPA-550" (average particle size 4.0 to 6.0 μm, manufactured by Aica Kogyo Co., Ltd.).

The content of component B in the present invention is not particularly limited as long as the desired effect can be achieved, but from the viewpoint of improving spreadability on the skin and significantly enhancing the soft-focus effect, it is generally preferable to be 1% to 10% by mass, and more preferably 3% to 7% by mass, of 100% by mass of the cosmetic composition. Note that the content of component B is the amount converted to pure content.

[Component C]
The above component C is a methyl methacrylate crosspolymer with an average particle size of 14 to 22 μm. In this invention, by using the above component C and combining it with other essential components, the spreadability on the skin during application can be improved, and the soft-focus effect can be further enhanced. The average particle size is the median diameter (D50) measured by laser diffraction.

In the present invention, component C may be a commercially available product. The commercially available component C is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. Specific examples of commercially available products include the product name "Matsumoto Microsphere M-305QD18" (uniform particle size 14-22 μm, manufactured by Matsumoto Oil & Fat Pharmaceutical Co., Ltd.).

The content of component C in the present invention is not particularly limited as long as the desired effect can be achieved, but from the viewpoint of improving spreadability on the skin and further enhancing the soft-focus effect, it is generally preferable to be 1% to 10% by mass, and more preferably 3% to 7% by mass, of 100% by mass of the cosmetic composition. Note that the content of component C is the amount converted to pure content.

In the powdered solid cosmetic composition of the present invention, the total amount of component A, component B, and component C is 70% by mass or more of the total amount of the cosmetic composition. In the present invention, by setting the total amount of component A, component B, and component C to 70% by mass or more of the total amount of the cosmetic composition, it is possible to achieve not only the effect of uniform adhesion to the skin when applied, good spreadability, and long-lasting makeup, but also the particularly remarkable effect of making the skin appear finer after application and making the skin appear even brighter through a soft-focus effect.

In addition, from the viewpoint of fully exhibiting the unique effects of the present invention described above, the ratio of the content of component A to the total amount of component B and component C (component A / (component B + component C)) is preferably in the range of 1 to 20, more preferably in the range of 3 to 17, and most preferably in the range of 5 to 14.

[Component D]
In the powdered solid cosmetic composition of the present invention, it is preferable to further contain the following component D.
Component D: Silica with an average particle size of 1.0 to 5.0 μm

In this invention, by further incorporating component D, the spreadability on the skin during application can be improved, and the soft-focus effect can be further enhanced. In addition, stickiness caused by liquid oil can be reduced. The average particle size is the median diameter (D50) measured by laser diffraction.

In the present invention, component D may be a commercially available product. The commercially available component D is not particularly limited, whether it is a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. Specific examples of commercially available products include the product name "BA4" (average particle size 1.0 to 5.0 μm, manufactured by JGC Catalysts & Chemicals Co., Ltd.) and the product name "Gotball G-6C" (average particle size 3.2 to 5.0 μm, manufactured by Suzuki Oil & Fat Industry Co., Ltd.).

The content of component D in the present invention is not particularly limited as long as the desired effect can be achieved, but from the viewpoint of improving spreadability on the skin and further enhancing the soft-focus effect, it is generally preferable to be 2% to 20% by mass, and more preferably 6% to 10% by mass, of 100% by mass of the cosmetic composition. Note that the content of component D is the amount converted to pure content.

In the powdered solid cosmetic composition of the present invention, it is preferable that the total amount of component A, component B, component C, and component D is 80% by mass or more of the total amount of the cosmetic composition. In the present invention, by setting the total amount of component A, component B, component C, and component D to 80% by mass or more of the total amount of the cosmetic composition, it is possible to further enhance the effects of uniform adhesion to the skin when applied, good spreadability, and good makeup retention, as well as to further enhance the particularly remarkable effects of making the skin appear finer after application and making the skin appear even brighter through a soft-focus effect.

In addition, from the viewpoint of fully exhibiting the unique effects of the present invention described above, the ratio of the content of component A to the total amount of component B, component C, and component D (component A / (component B + component C + component D)) is preferably in the range of 1 to 20, more preferably in the range of 1.5 to 15, and most preferably in the range of 3 to 7.

[Component E]
In the powdered solid cosmetic composition of the present invention, it is preferable to further contain the following component E.
Component E: Stearic acid-treated titanium dioxide and/or aluminum hydroxide-treated titanium dioxide

In this invention, by further incorporating the above-mentioned component E, it becomes possible to further enhance the soft-focus effect on the skin after treatment, making the skin appear even brighter.

In the present invention, component E may be a commercially available product. The commercially available component E may be a single raw material or a mixed raw material with other components, as long as the desired effect is achieved. Examples of commercially available stearic acid-treated titanium dioxide include the product name "SP Sorabelle XTP1 MBAL-PW-(MV)" (average particle size 0.179 μm, manufactured by Croda Europe Ltd). Examples of commercially available aluminum hydroxide-treated titanium dioxide include the product name "CR-50" (average particle size 0.25 μm, manufactured by Ishihara Sangyo Co., Ltd.).

The content of component E in the present invention is not particularly limited as long as the desired effect can be achieved. However, from the viewpoint of further enhancing the soft-focus effect on the skin after treatment and making the skin appear even brighter, it is generally preferable that the content be 1% by mass or more, and more preferably 2% by mass or more, per 100% by mass of the cosmetic. On the other hand, if the content exceeds 10% by mass, the spreadability will be poor, and the skin will feel more prone to squeaking, which may hinder the effects of the present invention. In other words, the content of component E is preferably 1% by mass to 10% by mass, and more preferably 2% by mass to 10% by mass. Note that the content of component E is the amount converted to pure content.

[Other ingredients]
In addition to the above-mentioned components, the powdered solid cosmetic composition of the present invention may appropriately contain, for example, powders other than components A to E mentioned above; oils other than the above-mentioned oils that are liquid at room temperature; plant extracts, anti-inflammatory agents, polyhydric alcohols, humectants, fragrances, pH adjusters, film-forming agents, chelating agents, lower alcohols, alkaline agents, vitamins, astringents, antioxidants, preservatives, UV absorbers, colorants, plant fermentation extracts, purified water, etc., depending on the purpose.

The powdered solid cosmetic composition of the present invention can be manufactured by known methods. Specific manufacturing methods include, for example, a method of compression molding the powdered solid cosmetic composition by a dry or wet method. Note that the cosmetic composition of the present invention is in a compressed powdered solid form (pressed form) and does not include loose powder form.

The powdered solid cosmetic composition of the present invention exhibits excellent effects when applied to the skin, and is therefore preferably used as a powdered solid (pressed) makeup cosmetic such as foundation, eyeshadow, eyebrow pencil, or concealer. Furthermore, the powdered solid cosmetic composition of the present invention can take the form of cosmetics, quasi-drugs, designated quasi-drugs, or general merchandise.

The areas to which the powdered solid cosmetic composition of the present invention is applied are not particularly limited, but as an example, it can be used on the face (forehead, around the eyes, corners of the eyes, cheeks, etc.), neck, décolleté, etc.

The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. Unless otherwise specified, the amounts of each ingredient are expressed in "mass percent".

(Sample preparation 1)
According to the compositions shown in Tables 1 to 3, the powdered solid cosmetic compositions of Examples 1 to 16 and Comparative Examples 1 to 5 were compressed and molded according to conventional methods and subjected to the following evaluations. The results are shown in Tables 1 to 3. Note that all blending amounts in the tables are calculated on a pure content basis. All evaluations were performed under constant temperature conditions (25 ± 2°C).

The following components were used in the examples and comparative examples.

[Component A]
Talc: Product name "TALCO SUPERRIORE M10" (oil absorption capacity 65 ml/100 g, manufactured by Imerys Talc)
[Component B]
Nylon-12: Product name "Gantzpearl GPA-550" (average particle size 4.0-6.0 μm, manufactured by Aica Kogyo Co., Ltd.)
[Component C]
Methyl methacrylate crosspolymer: Product name "Matsumoto Microsphere M-305QD18" (uniform particle size 14-22 μm, manufactured by Matsumoto Oil & Fat Pharmaceutical Co., Ltd.)
[Component D]
Silica: Product name "BA4" (average particle size 1.0-5.0 μm, manufactured by JGC Catalysts & Chemicals Co., Ltd.)
[Component E]
Stearic acid-treated titanium dioxide: Product name "SP Sorabelle XTP1 MBAL-PW-(MV)" (average particle size 0.179 μm, manufactured by Croda Europe Ltd.)
Aluminum hydroxide-treated titanium oxide: Product name "CR-50" (average particle size 0.25 μm, manufactured by Ishihara Sangyo Co., Ltd.)
[Liquid oil at room temperature]
Squalane: Product name "NIKKOL Sugar Squalane" (manufactured by Nikko Chemicals Co., Ltd.)
Jojoba seed oil: Product name "Jojobal (refined jojoba oil)" (manufactured by Watahan Trading Co., Ltd.)
Avocado oil: Product name "BIOCHEMICA AVOCADO OIL REF ORG" (manufactured by The HallStar Company)

(Test example 1: Evaluation of user experience)
A usage test was conducted by having participants apply 0.1 g of the powdered solid cosmetic obtained in each example and comparative example to their face (cheek) using a puff. The evaluation was based on sensory evaluation of six items: "uniformity during application,""spreadability during application,""makeuplongevity,""skintexture,""soft focus effect," and "skin brightness," and was scored according to the following evaluation points from 1 to 5. The evaluation was conducted by five expert evaluators, and the final result was determined by a comprehensive judgment of each evaluator's evaluation.

The evaluation of "Uniformity of Application" was based on the uniformity of application, with higher scores given for greater uniformity. The evaluation of "Spreadability of Application" was based on the spreadability of application, with higher scores given for greater spreadability. The evaluation of "Longevity of Makeup" was based on a comparison of the condition immediately after application and the condition 5 hours later, with higher scores given for less change in condition. The evaluation of "Skin Texture" was based on the finer the skin appeared after application, with higher scores given for greater smoothness. The evaluation of "Soft Focus Effect" was based on the degree of soft focus effect after application, with higher scores given for greater soft focus effect. The evaluation of "Skin Brightness" was based on the brighter the skin appeared after application, with higher scores given for greater brightness.

The evaluation was conducted according to the following five-level evaluation criteria. The results were calculated based on the average score of the expert evaluation panel, and a judgment was made according to the following criteria.

<Evaluation Criteria>
5 points: Excellent 4 points: Good 3 points: Average 2 points: Poor 1 point: Very Poor

<Judgment criteria>
◎: Average score of 4.0 or higher ○: Average score of 3.0 or higher but less than 4.0 △: Average score of 2.0 or higher but less than 3.0 ×: Average score of less than 2.0

The results shown in Tables 1 to 3 indicate that the powdered solid cosmetics obtained in each example adhered uniformly to the skin upon application, had good spreadability, long-lasting wear, made the skin appear finer after application, exhibited excellent soft-focus effects, and provided significantly better skin brightness compared to those obtained in each comparative example. In short, they demonstrated remarkably superior effects in all six evaluation items.

On the other hand, comparative examples of powdered solid cosmetics that did not satisfy the composition of the present invention, as well as comparative examples of powdered solid cosmetics in which other components were substituted, did not yield satisfactory results in the six evaluation items. As is clear from these results, the powdered solid cosmetic of the present invention can simultaneously solve the problems that conventional powdered solid cosmetics had during application and after application.

Claims (3)

A powder solid cosmetic composition comprising 5 to 13% by mass of a liquid oil at room temperature, which is compression-molded, and characterized in that it contains 60 to 85% by mass of the following component A, 1 to 10% by mass of the following component B, 1 to 10% by mass of the following component C, 2 to 20% by mass of the following component D, and 1 to 10% by mass of the following component E, wherein the total amount of component A, component B, and component C is 70% by mass or more of the total amount of the cosmetic composition.
Component A: Talc Component B: Nylon-12 with an average particle size of 4.0-6.0 μm
Component C: Methyl methacrylate crosspolymer with an average particle size of 14-22 μm.
Component D: Silica with an average particle size of 1.0 to 5.0 μm
Component E: Stearic acid-treated titanium dioxide and/or aluminum hydroxide-treated titanium dioxide The powdered solid cosmetic composition according to claim 1, characterized in that the ratio of the content of component A to the total amount of component B and component C (component A / (component B + component C)) is in the range of 1 to 20. The powdered solid cosmetic composition according to claim 1 or 2, characterized in that the ratio of the content of component A to the total amount of component B, component C, and component D (component A / (component B + component C + component D)) is in the range of 1 to 20.