Skin cosmetics

Abstract

This skin cosmetic offers superior comfort upon application, effectively removes pore impurities when wiped off, and maintains a pore-minimizing effect even after wearing a mask. [Solution] A phenoxyethanol-free skin cosmetic is provided, characterized by containing (A) 1 to 20% by mass of 1,3-propanediol, (B) 0.5 to 4% by mass of 1,2-pentanediol, (C) 0.01 to 0.5% by mass of glycerin mono-2-ethylhexyl ether, and (D) 0.0001 to 0.1% by mass of citrus extract on a solid content basis.

Description

Technical Field

[0001] The present invention relates to a skin cosmetic used for moisturizing the skin of the face, body, etc.

Background Art

[0002] Various moisturizing agents are formulated in skin cosmetics for moisturizing the skin. However, when using a skin cosmetic with a high content of a moisturizing agent, there is a problem of feeling sticky. Also, depending on the type of moisturizing agent, irritation may be felt. When feeling sticky or irritated, the comfort during application decreases, so it is desired to reduce stickiness and irritation.

[0003] Preservatives such as parabens and phenoxyethanol are formulated for the purpose of enhancing the storage stability of cosmetics, but these preservatives may also cause irritation. In recent years, the number of consumers who consider their own skin to be sensitive has been increasing, and it has been required that parabens and phenoxyethanol be not formulated in cosmetics targeted at such consumers.

[0004] Patent Document 1 discloses a low-irritation cosmetic containing at least three or more preservatives excluding phenoxyethanol, paraoxybenzoic acid ester, and 1,2-hexanediol.

[0005] On the other hand, cosmetics have come to be required to have multifunctionality. For example, all-in-one cosmetics that combine the functions of lotion, essence, and emulsion have been developed. Also, for time saving, skin cosmetics that can simultaneously remove dirt and moisturize by soaking into cotton, etc. have been developed, but it has not been easy to achieve both the effect of removing pore dirt and non-irritation.

[0006] For example, Reference 2 discloses that a cleansing lotion containing a specific polyoxyalkylene methyl glucoside, ethanol, and grape fruit extract has excellent sebum-removing properties. However, because it contains ethanol, it may cause irritation in people with sensitive skin. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2023-102152 [Patent Document 2] Japanese Patent Publication No. 2019-182804 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] Furthermore, in recent years, opportunities to wear masks have increased. However, since sebum secretion increases when wearing a mask, a problem has been that pores become more noticeable after wearing a mask. Therefore, there is a need for a skin cosmetic that is comfortable to apply, has excellent pore-clearing effects when wiped off, and can maintain a state where pores are less noticeable.

[0009] As described above, a skin cosmetic that is pleasant to apply, effectively removes pore impurities when wiped off, and keeps pores less noticeable even after wearing a mask has yet to be developed.

[0010] The objective of this invention is to provide a skin cosmetic that is pleasant to apply, effectively removes pore impurities when wiped off, and keeps pores less noticeable even after wearing a mask. [Means for solving the problem]

[0011] To solve the above problems, the inventors diligently studied and found that by adding a predetermined amount of glycerin mono-2-ethylhexyl ether and an extract obtained from citrus fruits to a cosmetic product containing predetermined amounts of 1,3-propanediol and 1,2-pentanediol, the product provides excellent comfort when applied, effectively removes pore impurities when wiped off, and maintains a state where pores are less noticeable even after wearing a mask. This led to the completion of the present invention.

[0012] In other words, the present invention relates to the following [1], [2] and [3]. [1] (A) 1,3-propanediol in 1 to 20% by mass, (B) 1,2-pentanediol in an amount of 0.5 to 4% by mass, (C) Glycerin mono-2-ethylhexyl ether in a concentration of 0.01-0.5% by mass, and (D) Extract from citrus fruits, 0.0001 to 0.1% by mass on a solid content basis. A skin cosmetic that is characterized by containing phenoxyethanol. [2] The skin cosmetic of [1], further characterized by containing (E) 0.05 to 1.6% by mass of polyoxyethylene sorbitan fatty acid ester. [3] (F) A skin cosmetic according to [1] or [2], characterized by containing 0.1 to 10% by mass of one or more water-soluble components selected from the group consisting of ascorbic acid 2-glucoside, tranexamic acid, and nicotinamide. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a skin cosmetic that is pleasant to apply, has a pore-cleansing effect when wiped off, and keeps pores less noticeable even after wearing a mask. [Modes for carrying out the invention]

[0014] Embodiments of the present invention will be described below. The present invention relates to a skin cosmetic containing each of the above-mentioned components in a specific proportion (hereinafter also referred to as the skin cosmetic of the present invention).

[0015] In the present invention, "skin cosmetic" refers to a cosmetic applied to the skin directly or indirectly by application or spraying, and specifically includes basic cosmetics such as lotions, emulsions, and creams, and medicated cosmetics (quasi-drugs). In this specification, numerical ranges defined using the symbol "~" include the numbers at both ends (upper and lower limits) of "~". For example, "2~5" means 2 or more and 5 or less.

[0016] <(A) 1,3-propanediol> The content of 1,3-propanediol should be 1 to 20% by mass relative to the total amount of skin cosmetic. If the content of 1,3-propanediol is less than 1% by mass, the comfort upon application may be insufficient, the effect of removing pore dirt when wiped off may be reduced, and the state of pores being less noticeable after wearing a mask may not be maintained. Therefore, it should be 1% by mass or more, preferably 2% by mass or more, and even more preferably 3% by mass or more. Furthermore, if the content of 1,3-propanediol exceeds 20% by mass, the comfort upon application may be insufficient. Therefore, it should be 20% by mass or less, preferably 18% by mass or less, and even more preferably 16% by mass or less.

[0017] <(B)1,2-pentanediol> The content of 1,2-pentanediol shall be 0.5 to 4% by mass relative to the total amount of skin cosmetic. If the content of 1,2-pentanediol is less than 0.5% by mass, the effect of removing pore dirt when used by wiping may be reduced, or the state of pores being less noticeable after wearing a mask may not be maintained. Therefore, it should be 0.5% by mass or more, preferably 1% by mass or more, and more preferably 1.5% by mass or more. Furthermore, if the content of 1,2-pentanediol exceeds 4% by mass, the comfort upon application may be insufficient, or the state of pores being less noticeable after wearing a mask may not be maintained. Therefore, it should be 4% by mass or less, preferably 3.5% by mass or less, and more preferably 3% by mass or less.

[0018] <(C) Glyceryl mono-2-ethylhexyl ether> The content of glyceryl mono-2-ethylhexyl ether shall be 0.01 to 0.5% by mass based on the total amount of the skin cosmetic. If the content of glyceryl mono-2-ethylhexyl ether is less than 0.01% by mass, the effect of removing pore dirt may decrease when used by wiping, so it shall be 0.01% by mass or more, preferably 0.03% by mass or more, and more preferably 0.05% by mass or more. Also, if the content of glyceryl mono-2-ethylhexyl ether exceeds 0.5% by mass, the comfort during application may be insufficient, or the state where pores are not noticeable after wearing a mask may not be maintained, so it shall be 0.5% by mass or less, preferably 0.45% by mass or less, and more preferably 0.4% by mass or less.

[0019] <(D) Extract from citrus fruits> The component (D) used in the present invention is an extract obtained from citrus fruits. The citrus fruits of the present invention are plants belonging to the genus Citrus of the family Rutaceae. Examples of plants belonging to the genus Citrus of the family Rutaceae include Citrus unshiu, Citrus depressa, Citrus tachibana, Citrus aurantifolia, Citrus aurantium, Citrus limon, Citrus sinensis, Citrus junos, Citrus natsudaidai, Citrus paradisi, etc. Preferably, they are Citrus depressa, Citrus tachibana, Citrus aurantium, Citrus limon, Citrus junos, Citrus paradisi, and more preferably Citrus aurantium, Citrus limon.

[0020] (D) The extract from citrus fruits is an extract obtained from the fruits, fruit juices, fruit peels, and seeds of citrus fruits. (D) The extract (plant extract) can be obtained by directly using citrus fruits, seeds, etc. or after pulverization and extraction with an extraction solvent, but is not limited thereto. These components are also available as commercially available cosmetic raw materials. Generally, citrus extracts contain 0.1 to 3.0% by mass of solids such as citrus fruits and seeds.

[0021] In the present invention, examples of the extraction solvent used for extraction from citrus include water and aqueous solvents. Examples of the aqueous solvent include esters such as ethyl acetate; ketones such as acetone; ethers such as diethyl ether, tetrahydrofuran, and diethylene glycol ether; and alcohols such as lower alcohols and polyhydric alcohols. Among them, from the viewpoints of safety and good extraction efficiency, water; lower alcohols such as methanol, ethanol, propanol, and isopropanol; and polyhydric alcohols such as propylene glycol, dipropylene glycol, 1,3-butylene glycol, and glycerin are preferred, and water, 1,3-butylene glycol, and glycerin are more preferred.

[0022] In the present invention, one kind selected from the above extraction solvents may be used alone, or a mixed solvent composed of two or more kinds may be used, and a mixed solvent of water and 1,3-butylene glycol is more preferred. The extraction treatment with the solvent can be carried out, for example, when the extraction solvent is water, usually at 100 to 2000 parts by mass, preferably 200 to 1000 parts by mass, based on 100 parts by mass of the plant. Similarly, when the extraction solvent is a lower alcohol, it can be usually extracted at 100 to 5000 parts by mass, preferably 500 to 2000 parts by mass.

[0023] The extraction temperature is appropriately determined according to the type of extraction solvent used. For example, when the extraction solvent is water, the extraction temperature is usually about 20 to 120°C, and when the extraction solvent is a lower alcohol, it is usually about 30 to 80°C.

[0024] A common extraction method is employed. For example, an extract can be obtained by adding an extraction solvent to undried or dried plants, immersing them, stirring if necessary, and then filtering. Methods for drying the plants include air drying, warm drying, and freeze drying. The plants may also be finely chopped for optimal extraction efficiency.

[0025] The extraction time (immersion time) is usually 1 hour or more, preferably 3 hours or more, and more preferably 5 hours or more. From the viewpoint of extraction efficiency, the upper limit of the extraction time is usually 10 hours or less, and preferably 8 hours or less. The number of extractions is not particularly limited, but it is preferable to perform the extraction once with the aforementioned amount of water or aqueous solvent.

[0026] The resulting extract may be used as is, or it may be concentrated by solvent removal, purified by methods such as column chromatography or solvent fractionation as needed, and then dried before use.

[0027] This extract can be diluted with water, glycerin, or a polyhydric alcohol such as 1,3-butylene glycol for easier handling. This extract can be a commercially available product.

[0028] (D) The content of the citrus extract shall be 0.0001 to 0.1% by mass in terms of solid content relative to the total amount of skin cosmetic. However, the term "in terms of solid content" here refers to the amount of solid content (evaporation residue) obtained by removing liquid components such as the extraction solvent from the citrus extract through evaporation. If the content of the citrus extract (D) is less than 0.0001% by mass in terms of solid content, it may not be possible to maintain a state where pores are not noticeable after wearing a mask, so it should be 0.0001% by mass or more, preferably 0.0003% by mass or more, and even more preferably 0.0005% by mass or more. Also, if the content of the citrus extract (D) exceeds 0.1% by mass in terms of solid content, the effect commensurate with the amount added may not be obtained, so it should be 0.1% by mass or less, preferably 0.05% by mass or less, and even more preferably 0.02% by mass or less.

[0029] From the viewpoint of improving the comfort of application, the mass ratio ((A) / (B)) of the content of (A) 1,3-propanediol to the content of (B) 1,2-pentanediol is preferably 1 to 15, more preferably 2 to 10, and particularly preferably 3 to 6.

[0030] From the viewpoint of maintaining a state where pores are less noticeable after wearing a mask, the mass ratio ((C) / (D)) of the content of (C) glycerin mono-2-ethylhexyl ether to the content of (D) citrus extract (in terms of solid content) is preferably 5 to 1000, more preferably 10 to 500, and particularly preferably 30 to 300.

[0031] <(E) Polyoxyethylene sorbitan fatty acid ester> (E) Polyoxyethylene sorbitan fatty acid esters are esterification products of polyoxyethylene sorbitan and fatty acids. The fatty acids that form (E) polyoxyethylene sorbitan fatty acid esters preferably have 12 to 18 carbon atoms and may be saturated or unsaturated.

[0032] Furthermore, the number of moles of ethylene oxide added to the polyoxyethylene group of (E) polyoxyethylene sorbitan fatty acid ester is preferably 10 to 40, and more preferably 15 to 30. In addition, (E) polyoxyethylene sorbitan fatty acid ester is preferably a monoester.

[0033] Examples of polyoxyethylene sorbitan fatty acid esters include polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, and polyoxyethylene sorbitan monooleate (polysorbate 80), with polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate being particularly preferred.

[0034] (E) The content of polyoxyethylene sorbitan fatty acid ester is preferably 0.05 to 1.6% by mass, more preferably 0.1 to 1.2% by mass, and even more preferably 0.2 to 0.8% by mass, relative to the total amount of the skin cosmetic. (E) When the content of polyoxyethylene sorbitan fatty acid ester is within the above range, the pleasant feeling when applied and the effect of removing pore dirt when wiped off are further improved.

[0035] <(F) Water-soluble components> The (F) water-soluble component used in the present invention is one or more water-soluble components selected from ascorbic acid 2-glucoside, tranexamic acid, and nicotinamide, with nicotinamide being particularly preferred.

[0036] (F) The content of water-soluble components is preferably 0.1 to 10% by mass, more preferably 0.5 to 8% by mass, and even more preferably 0.8 to 6% by mass, relative to the total amount of skin cosmetic. (F) When the content of water-soluble components is within the above range, the effect of maintaining a state where pores are less noticeable after wearing a mask is further improved.

[0037] The water content in the skin cosmetic composition of the present invention is preferably 45 to 97% by mass, more preferably 50 to 95% by mass, and particularly preferably 55 to 93% by mass. In addition to ion-exchanged water and distilled water, natural water containing minerals, aromatic water such as rose water, and fermented liquids such as rice bran fermentation liquid obtained by fermenting rice bran with yeast can also be used as water.

[0038] <Excluded ingredients> The present invention relates to a hypoallergenic skin cosmetic that does not contain phenoxyethanol as a preservative. When a skin cosmetic contains phenoxyethanol, the comfort during application is inferior. More preferably, the skin cosmetic is a paraben-free, hypoallergenic skin cosmetic that does not contain parahydroxybenzoic acid esters as a preservative.

[0039] <Other additives> In addition to the above-mentioned components and water, the skin cosmetic composition of the present invention may further contain other common cosmetic ingredients as additives.

[0040] Other additives include, for example, humectants (excluding (A) 1,3-propanediol and (B) 1,2-pentanediol); oils; surfactants; preservatives (at least excluding phenoxyethanol); thickeners; pH adjusters; antioxidants; chelating agents; fragrances; dyes; pigments; amino acids; ceramides, etc. The content of other additives is preferably 40% by mass or less, and more preferably 30% by mass or less, based on the total amount of the skin cosmetic.

[0041] The skin cosmetic composition of the present invention can be manufactured by known methods. For example, the skin cosmetic composition of the present invention can be manufactured by mixing (A) 1,3-propanediol, (B) 1,2-pentanediol, (C) glycerin mono-2-ethylhexyl ether, (D) an extract from citrus fruits, and optionally one or more water-soluble components selected from (E) polyoxyethylene sorbitan fatty acid ester, (F) ascorbic acid 2-glucoside, tranexamic acid, and nicotinamide, and adjusting the pH to an optimal level as appropriate.

[0042] The skin cosmetic composition of the present invention can be in the form of a liquid, gel, emulsion, cream, etc., and can be used on the face, body, etc. [Examples]

[0043] The present invention will be described in more detail below with reference to examples and comparative examples. <Examples 1-17, Comparative Examples 1-5> Each of the skin cosmetic products shown in Tables 1 to 3 was prepared by known methods and evaluated by the following methods.

[0044] In Tables 1 to 3, the values ​​for each component indicate the content (mass %) relative to the total amount of the skin cosmetic. Furthermore, (A) / (B) indicates the mass ratio of (A) 1,3-propanediol content to (B) 1,2-pentanediol content. (C) / (D) indicates the mass ratio of (C) glycerin mono-2-ethylhexyl ether content to (D) citrus extract content (on a solids basis).

[0045] <Evaluation Method> (1) Evaluation of comfort during application Twenty women aged 25 to 55 served as panelists. They took 1g of skin cosmetic in their palm and applied it to their face, evaluating the pleasant feeling according to the following criteria. 2 points: If it feels very comfortable without stickiness or irritation. 1 point: If it feels pleasant with little to no stickiness or irritation. 0 points: If you felt it was sticky, irritating, or unpleasant.

[0046] (2) Evaluation of the effectiveness of removing pore dirt when used by wiping. Twenty women aged 25 to 55 served as panelists, and the effectiveness of using 1g of skin cosmetic on a cotton pad to wipe their faces against pores was evaluated according to the following criteria. 2 points: If you feel that blackheads in pores are less noticeable and that the product has a very high effectiveness in removing pore impurities. 1 point: If you feel that blackheads in your pores are less noticeable and that the product has a high effectiveness in removing pore impurities. 0 points: If you felt that the removal effect on pore dirt was not high enough.

[0047] (3) Evaluation of the duration of the condition in which pores are less noticeable after wearing a mask. Twenty women aged 25 to 55 served as panelists. They wiped their faces with cotton pads soaked in 1g of skin cosmetic, and after wearing a mask for two hours, they evaluated the visibility of their pores according to the following criteria. 2. If you feel that the visibility of your pores has hardly changed compared to before wearing a mask. 1 point: If you feel that the visibility of your pores has not changed much compared to before wearing a mask. 0 points: If you feel that your pores have become more noticeable compared to before wearing a mask.

[0048] The sum of each panelist's scores from the evaluations in (1) to (3) above was judged according to the following criteria and is shown in Tables 1 to 3. "◎" and "○" were judged as passing. ◎: Total score of 35 points or more ○: Total score of 30 points or more, and 34 points or less. △: Total score is between 20 and 29 points. ×: Total score is 19 points or less

[0049] [Table 1]

[0050] [Table 2]

[0051] [Table 3]

[0052] As shown in Tables 1 and 2, all of the skin cosmetics in Examples 1 to 17 provided excellent comfort upon application, effectively removed pore impurities when wiped off, and maintained a state where pores were less noticeable even after wearing a mask.

[0053] In contrast, comparative examples 1 to 5 did not achieve sufficient performance. Comparative Example 1 did not contain (A) 1,3-propanediol, but instead contained the similar compound 1,3-butanediol. As a result, it was not comfortable to apply and could not maintain a state where pores were less noticeable after wearing a mask.

[0054] Comparative Example 2, lacking (B) 1,2-pentanediol, had insufficient pore-cleaning effects when used by wiping, and was unable to maintain a state where pores were less noticeable after wearing the mask.

[0055] Comparative Example 3 did not contain (C) glycerin mono-2-ethylhexyl ether, and therefore its effect on removing pore dirt when used by wiping was insufficient.

[0056] Comparative Example 4 did not contain (D) citrus extracts, but instead contained a similar product, loquat leaf extract, and therefore could not maintain a state where pores were less noticeable after wearing the mask.

[0057] Comparative Example 5 falls within the scope of the present invention for each component (A) to (D), but because it also contains phenoxyethanol, the comfort level during application was insufficient.

[0058] Next, examples of formulations of the skin cosmetic of the present invention (Formulation Examples 1 and 2) are shown. These formulations of skin cosmetic also provided excellent comfort upon application, and when wiped off, they had a pore-cleansing effect, and the pores remained less noticeable even after wearing a mask.

[0059] [Prescription Example 1] Gel-type skin cosmetic (numerical values ​​are in mass %) (A) 1,3-Propanediol: 10 (B) 1,2-pentanediol: 2 (C) Glycerin mono-2-ethylhexyl ether: 0.2 (D) Grapefruit seed extract: 0.001 (D) Grapefruit fruit extract: 0.001 (E) Polysorbate 80: 0.4 (F) Nicotinamide: 5 Sodium hyaluronate: 0.01 1,3-Butanediol: 4 Glycerin: 5 Diglycerin: 1 Carboxyvinyl polymer: 0.2 Alkyl-modified carboxyvinyl polymer: 0.2 Arginine: 0.2 Glutamic acid: 0.001 Serine: 0.001 Proline: 0.001 Alanine: 0.001 Fragrance: Appropriate amount Water: Remaining amount

[0060] [Prescription Example 2] Emulsion-type skin cosmetic (numerical values ​​are in mass %) (A) 1,3-propanediol: 8 (B) 1,2-pentanediol: 2 (C) Glycerin mono-2-ethylhexyl ether: 0.3 (D) Shikuwasa peel extract: 0.001 (D) Yuzu fruit extract: 0.001 (E) Polysorbate 80: 0.5 (F) Ascorbic acid 2-glucoside: 2 Dipotassium glycyrrhizinate: 0.1 Sodium hyaluronate: 0.01 1,3-Butanediol: 4 Glycerin: 5 Diglycerin: 1 Carboxyvinyl polymer: 0.1 Alkyl-modified carboxyvinyl polymer: 0.1 Arginine: 0.1 PEG-75 stearate: 0.5 Glyceryl stearate: 1 Behenyl alcohol: 1 Olive fruit oil: 6 Cetyl ethylhexanoate: 6 Tocopherol: 0.1 Glutamic acid: 0.001 Serine: 0.001 Proline: 0.001 Alanine: 0.001 Fragrance: Appropriate amount Water: Remaining amount [Industrial applicability]

[0061] This invention provides a skin cosmetic that offers excellent comfort when applied, effectively removes pore impurities when wiped off, and keeps pores less noticeable even after wearing a mask.

Claims

1. (A) 1,3-propanediol in an amount of 1 to 20% by mass, (B) 1,2-pentanediol in an amount of 0.5 to 4% by mass, (C) 0.01 to 0.5% by mass of glycerin mono-2-ethylhexyl ether, and (D) Extract from citrus fruits, 0.0001 to 0.1% by mass on a solid content basis. A skin cosmetic that is characterized by containing phenoxyethanol.

2. The skin cosmetic composition according to claim 1, further characterized by containing (E) 0.05 to 1.6% by mass of polyoxyethylene sorbitan fatty acid ester.

3. (F) A skin cosmetic composition according to claim 1 or 2, characterized by containing 0.1 to 10% by mass of one or more water-soluble components selected from the group consisting of ascorbic acid 2-glucoside, tranexamic acid, and nicotinamide.

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