JP7795986B2 - Cleansing cosmetics - Google Patents

Description

The present invention relates to a cleansing cosmetic, a solvent-based skin care cosmetic, used for the purpose of removing cosmetics and dirt from the skin.

Skin cleansers that remove oily dirt such as makeup and skin stains are desired to have both strong cleansing power and a pleasant feel after cleansing. An example of a skin cleanser is liquid cleansing oil. Generally, cleansing oils are known to have excellent cleansing power, even among skin cleansers that remove makeup. However, cleansing oils tend to wash away excessive sebum from the skin, which can dry out the skin after use.

Therefore, it is possible to use an oil that is also used as a moisturizing ingredient as the base of a cleansing oil. One such oil is squalane. Squalane is a colorless, transparent oil obtained by hydrogenating squalene, which is obtained from shark liver oil. Squalene is also found in wheat germ oil and human sebum, and is known as a cholesterol precursor. Squalane is chemically stable, has a less oily feel than liquid paraffin, which is also a hydrocarbon, and feels very pleasant to the touch, making it a representative, high-quality oil. Squalane is virtually non-irritating to the skin and has excellent emollient properties, making it particularly popular as an ingredient in high-end cosmetics (see, for example, Non-Patent Document 1).

A known example of a cleansing oil containing squalane as a base is a scalp cleansing oil cosmetic containing squalane, caprylic/capric triglyceride, jojoba seed oil, and sorbeth-40 tetraoleate (see Patent Document 1).

Meanwhile, petroleum-derived oils are commonly used as bases for skin cleansers. One such oil is liquid paraffin. A known skin cleanser containing liquid paraffin as a base is a transparent liquid skin cleanser containing liquid paraffin (27.54% to 27.587% by mass), isononyl isononanoate, methylphenylpolysiloxane (5.00% by mass), jojoba oil, polyoxyethylene sorbitan tetraoleate (40EO) (14.00% by mass), and purified water (see Patent Document 2).

JP 2015-089869 A Japanese Patent Application Laid-Open No. 2004-256474

Cosmetic Ingredient Dictionary 2012, 6th Edition, published August 31, 2012, pages 30-31

Cleansing cosmetics used to remove cosmetics and dirt from the skin are desirably transparent to convey a feeling of cleansing, in addition to cleansing power and a pleasant feel when used. It is unclear whether the scalp cleansing oil cosmetic described in Patent Document 1 is transparent, and research by the present inventors has shown that a transparent cleansing cosmetic cannot be obtained simply by combining squalane and a nonionic surfactant.

The liquid transparent skin cosmetic described in Patent Document 2 uses liquid paraffin as a base. As described in Non-Patent Document 1, petroleum-derived liquid paraffin has a stronger oily feel and a poorer texture than naturally-derived squalane. Furthermore, the liquid transparent skin cosmetic described in Patent Document 2 contains a smaller amount of liquid paraffin relative to the nonionic surfactant polyoxyethylene sorbitan tetraoleate (40EO). As a result, the liquid transparent skin cosmetic described in Patent Document 2 has inferior cleansing power and may be subject to significant irritation from the nonionic surfactant.

Furthermore, few cleansing cosmetics have been known to date that contain squalane as a base, which provides a pleasant feel when used, while also exhibiting good cleansing power and transparency.

The problem that the present invention aims to solve is to provide a cleansing cosmetic that contains squalane as a base but has good cleansing power and transparency.

The inventors of the present invention conducted extensive research to solve the above-mentioned problems, and by using squalane as a base and jojoba seed oil in addition, they were able to prepare a cleansing cosmetic that has excellent emollient effects and leaves the skin feeling moisturized after cleansing. However, it was difficult to obtain a transparent cosmetic that also contained these ingredients.

The inventors then conducted further trial and error and found that when they tried using a nonionic surfactant to increase the compatibility of the ingredients, they sometimes obtained a transparent cleansing cosmetic, but sometimes not. Furthermore, even though the resulting cleansing cosmetic was highly transparent, separation, clouding, solidification, and other problems could occur depending on the storage conditions.

Based on the above findings, the inventors further investigated the matter and found that by combining squalane and jojoba seed oil with ester oil and water, as well as a specified nonionic surfactant and a specified silicone oil, they were able to obtain a cleansing cosmetic product with high cleansing power and a transparent finish. Surprisingly, the resulting cleansing cosmetic product also had excellent stability over time.

Based on this knowledge, the inventors have succeeded in creating a cleansing cosmetic product that contains squalane, jojoba seed oil, ester oil, water, a specified nonionic surfactant, and a specified silicone oil, in order to solve the problems of the present invention. The present invention was completed based on these findings and successful examples.

Therefore, as one aspect of the present invention, the following embodiments are provided.
[1] (A) squalane,
(B) jojoba seed oil;
(C) an ester oil;
(D) a silicone oil which is a methylphenylpolysiloxane having a phenyl group and a trimethylsiloxy group;
(E) a nonionic surfactant which is a polyoxyethylene sorbitol fatty acid ester having four or more ester bonds (excluding sorbeth-40 tetraoleate);
(F) A cleansing cosmetic comprising water.
[2] The cleansing cosmetic according to [1], wherein the content of the component (D) is 15% by mass to 30% by mass.
[3] The cleansing cosmetic according to [1], wherein the ratio of the content of the component (A) to the content of the component (D) ((A)/(D)) is 0.5 to 5.0, and/or the ratio of the content of the component (A) to the content of the component (E) ((A)/(E)) is 5 to 40.
[4] The cleansing cosmetic according to [1], wherein the content of the component (A) is 29% by mass to 60% by mass.
[5] The cleansing cosmetic according to [1], wherein the total content of the components (A) to (F) is 80% by mass to 90% by mass.
[6] The cleansing cosmetic according to any one of [1] to [5], wherein the component (D) is at least one selected from the group consisting of diphenylsiloxyphenyl trimethicone and phenyl trimethicone.
[7] The cleansing cosmetic according to any one of [1] to [5], wherein the component (E) is at least one selected from the group consisting of sorbeth tetraoleate and sorbeth pentaoleate.
[8] Squalane having a content of 29% by mass to 60% by mass,
Jojoba seed oil having a content of 1% by mass to 15% by mass;
An ester oil having a content of 1% by mass to 40% by mass;
a silicone oil that is a methylphenylpolysiloxane having a phenyl group and a trimethylsiloxy group in an amount of 12% by mass to 35% by mass;
a nonionic surfactant that is a polyoxyethylene sorbitol fatty acid ester having four or more ester bonds, the content of which is 0.5% by mass to 10% by mass (excluding sorbeth-40 tetraoleate);
and water in a content of 0.8% by mass to 2.3% by mass.

According to the present invention, a cleansing cosmetic composition can be provided that has good cleansing power and transparency by using squalane, which has both cleansing power and a high emollient effect, as a base, and further containing jojoba seed oil, which has a high emollient effect, as well as ester oil, water, a specified nonionic surfactant, and a specified silicone oil. The cleansing cosmetic composition of one embodiment of the present invention contains squalane, jojoba seed oil, ester oil, silicone oil, and other oils with cleansing effects, and is expected to be used daily to remove oily dirt, such as makeup cosmetics and skin dirt, from the skin with a pleasant feel.

Furthermore, the cleansing cosmetic composition of one embodiment of the present invention has excellent stability and can be used and stored for long periods of time. Furthermore, the cleansing cosmetic composition of one embodiment of the present invention can be produced without complex processes, making it possible to produce it on an industrial scale.

The following describes each aspect of the present invention in detail, but the present invention can take various forms as long as it achieves its objectives.

Unless otherwise specified, each term in this specification is used in the sense commonly used by those skilled in the cosmetics field and should not be construed as having an unduly restrictive meaning. Furthermore, the theories and speculations made in this specification are based on the inventors' knowledge and experience to date, and therefore the technical scope of the present invention is not limited solely by such theories and speculations.

"And/or" means any one or any or all combinations of two or more of the associated listed items.
"Content" is synonymous with concentration and refers to the ratio of the amount of a component to the total amount of the cleansing cosmetic. However, the total content of each component does not exceed 100%. In this specification, unless otherwise specified, the unit of content is "mass % (wt%)". When a commercially available product is used, the content of the component is preferably the amount of the component contained in the commercially available product, but may also be the amount of the commercially available product itself.
In this specification, the term "to" in a numerical range means a range that includes the preceding and following numerical values; for example, "0% by mass to 100% by mass" means a range that is 0% by mass or more and 100% by mass or less. "Exceeding" and "less than" mean a lower limit and an upper limit, respectively, that do not include the preceding numerical value; for example, "exceeding 1" means a numerical value greater than 1, and "less than 100" means a numerical value less than 100.
"Comprising" means that elements other than those explicitly stated as being included can be added (same meaning as "comprising at least"), but also encompasses "consisting of" and "consisting essentially of." That is, "comprising" can mean including the explicitly stated elements and any one or more elements, consisting of the explicitly stated elements, or consisting essentially of the explicitly stated elements. Elements include limitations such as ingredients, steps, conditions, and parameters.
The number of digits in an integer value matches the number of significant digits. For example, 1 has one significant digit, and 10 has two significant digits. Also, the number of digits after the decimal point in a decimal value matches the number of significant digits. For example, 0.1 has one significant digit, and 0.10 has two significant digits.

The cleansing cosmetic composition of one embodiment of the present invention contains squalane (component (A)), jojoba seed oil (component (B)), ester oil (component (C)), a specified silicone oil (component (D)), a specified nonionic surfactant (component (E)), and water (component (F)).

Component (A), squalane, is a commonly known hydrogenated product of squalene. Squalane functions to impart various effects to cleansing cosmetics, including an emollient effect that reduces moisture loss from the skin, retains moisture, and softens the skin; a moisturizing effect that maintains skin moisture by replenishing skin moisture and preventing moisture evaporation; and a cleansing effect that dissolves and removes oily dirt. Component (A) can be obtained by hydrogenating squalene, which is contained in natural oils such as shark liver oil and vegetable oil, by fermenting sugarcane extract, or by other known methods. Component (A) may also be commercially available.

The content of component (A) is not particularly limited, as long as it is an amount that can exert the desired effect of squalane. However, for example, if it is desired to impart a moist feeling to the skin after cleansing with a cleansing cosmetic, the content is preferably 25% to 70% by mass, more preferably 29% to 60% by mass, and even more preferably 30% to 55% by mass. Because component (A) is used as a base for the cleansing cosmetic, it is preferably the highest content of all the components included.

As is commonly known, component (B) jojoba seed oil is a liquid wax obtained from the seeds of jojoba ( Simmondsia chinensis ; Jojoba), a plant of the Simmondsiaceae family. Like component (A), component (B) functions to impart emollient, moisturizing, and cleansing properties to cleansing cosmetics. Component (B) can be obtained by squeezing or extracting jojoba seeds. Component (B) may be commercially available.

The content of component (B) is not particularly limited, as long as it is an amount that can exert the desired effect of jojoba seed oil. However, for example, if you wish to impart a moist feeling to the skin after cleansing with a cleansing cosmetic, the content is preferably 0.1% to 20% by mass, more preferably 1% to 15% by mass, and even more preferably 3% to 12% by mass.

As is commonly known, the ester oil of component (C) is a synthetic oil synthesized from a fatty acid and an alcohol. The cleansing cosmetic of one embodiment of the present invention contains component (C), which improves the miscibility between the components and improves transparency after preparation, making it a cosmetic with excellent transparency. Furthermore, in addition to its aforementioned function, component (C) also functions to impart other functions, such as a cleansing effect, to the cleansing cosmetic.

Component (C) is not particularly limited as long as it can be expected to achieve the above-mentioned effect. Examples include cetyl ethylhexanoate, triethylhexanoin, isononyl isononanoate, diethyl sebacate, diisopropyl adipate, myristyl myristate, isopropyl palmitate, ethylhexyl palmitate, isopropyl myristate, and tri(caprylic/capric)glyceryl. However, cetyl ethylhexanoin, triethylhexanoin, and isononyl isononanoate are preferred because they have relatively low viscosity at room temperature and therefore good compatibility with squalane and other components. Component (C) may be one of the above compounds alone, or a combination of two or more. Component (C) may be obtained by synthesis using a known method, or may be commercially available.

The content of component (C) is not particularly limited, as long as it is an amount that can exert the desired effect of the ester oil. However, from the viewpoint of the transparency of the cleansing cosmetic product containing the ester oil, it is preferably 0.1% to 50% by mass, more preferably 1% to 40% by mass, and even more preferably 3% to 35% by mass.

Component (D) is a silicone oil that is a methylphenylpolysiloxane containing phenyl groups and trimethylsiloxy groups. Of these, a structure in which a phenyl group and a trimethylsiloxy group are bonded to the same silicon atom is preferred.

The cleansing cosmetic composition of one embodiment of the present invention can be a cosmetic composition with excellent transparency because the inclusion of component (D) improves the miscibility between the components and improves transparency after preparation. Furthermore, the cleansing cosmetic composition of one embodiment of the present invention can be a cosmetic composition with excellent stability over time because the inclusion of component (D) allows the components to remain uniformly dissolved during storage. Furthermore, in addition to the above-mentioned function, component (D) also functions to impart an effect such as a cleansing action to the cleansing cosmetic composition.

Component (D) is not particularly limited as long as it can be expected to achieve the above-mentioned effect. Examples include diphenylsiloxyphenyl trimethicone, phenyl trimethicone, trimethylsiloxyphenyl dimethicone, and aminopropyl phenyl trimethicone. However, diphenylsiloxyphenyl trimethicone and phenyl trimethicone are preferred because they have relatively low viscosity at room temperature and therefore good compatibility with squalane and other ingredients. Component (D) may be one of the above compounds alone, or a combination of two or more. Component (D) may be obtained by synthesis using a known method, or may be commercially available.

The content of component (D) is not particularly limited, as long as it is an amount that can exert the expected effect of component (D). However, from the viewpoint of the transparency and stability over time of the cleansing cosmetic composition due to component (D), for example, it is preferably more than 10% by mass and not more than 40% by mass, more preferably 12% to 35% by mass, and even more preferably 15% to 30% by mass.

From the perspective of the transparency of the cleansing cosmetic, it is preferable that the content of component (D) has a certain relationship with the content of component (A). In other words, it is preferable that component (D) is contained in a certain amount or more relative to component (A). From this perspective, the ratio of the content of component (A) to the content of component (D) ((A)/(D)) is, for example, preferably less than 5.4, more preferably 0.5 to 5.0, and even more preferably 1.0 to 3.5.

The inventors' research into silicone oils has revealed that when diphenyldimethicone, dimethicone, or cyclopentasiloxane is used in place of component (D), the transparency or stability over time of the resulting cleansing cosmetic tends to be impaired. Therefore, even when the cleansing cosmetic of one embodiment of the present invention contains diphenyldimethicone, dimethicone, and cyclopentasiloxane, the total content of these components is preferably less than the content of component (D), more preferably less than 10% by mass, even more preferably less than 1% by mass, and even more preferably 0.1% by mass or less.

Component (E), a nonionic surfactant that is a polyoxyethylene sorbitol fatty acid ester having four or more ester bonds, is a nonionic surfactant that is formed by ester bonds between a tetrahydric or higher polyhydric alcohol having an etherified portion and a fatty acid, and that exhibits surface-active properties.

The cleansing cosmetic of one embodiment of the present invention contains component (E), which allows each component to remain uniformly dissolved during storage, making it a cosmetic with excellent stability over time. In addition to this function, component (E) also exhibits a surfactant effect that increases the compatibility of each component in the cleansing cosmetic.

Component (E) is not particularly limited as long as it can be expected to achieve the above-mentioned effect, and examples include polyoxyethylene sorbite fatty acid esters to which multiple moles of ethylene oxide have been added and in which the fatty acid is selected from oleic acid, stearic acid, isostearic acid, and lauric acid. The number of moles of ethylene oxide added is not limited, and examples include 6 moles, 30 moles, 40 moles, and 60 moles. However, in any case, sorbeth-40 tetraoleate is excluded from component (E).

Component (E) has a bulky structure due to the presence of a tetrahydric or higher polyhydric alcohol as a structural unit, which is presumed to contribute to the improved stability of the cleansing cosmetic over time. Furthermore, since component (E) tends to improve the stability of the cleansing cosmetic over time, the hydrophilic-lipophilic balance (HLB) of component (E) is preferably 8 to 14, more preferably 8.5 to 12, and even more preferably 9 to 10.5. From these perspectives, preferred examples of component (E) include sorbeth-30 tetraoleate, sorbeth-40 pentaoleate, sorbeth-6 tetraoleate, sorbeth-60 tetraoleate, and sorbeth-60 tetrastearate, with sorbeth-30 tetraoleate and sorbeth-40 pentaoleate being more preferred from the standpoint of the stability of the cleansing cosmetic over time. Component (E) may be one of the above compounds alone or a combination of two or more. Component (E) may be obtained by synthesis using a known method, or may be a commercially available compound.

The content of component (E) is not particularly limited, as long as it is an amount that can exert the expected effect of component (E). However, from the viewpoint of the stability over time of the cleansing cosmetic, for example, it is preferably 0.1% to 20% by mass, more preferably 0.5% to 10% by mass, and even more preferably 1% to 5% by mass.

From the viewpoint of the stability over time of the cleansing cosmetic, it is preferable that the content of component (E) has a certain relationship with the content of component (A). From this viewpoint, the ratio of the content of component (A) to the content of component (E) ((A)/(E)) is, for example, preferably 3 to 50, more preferably 5 to 40, and even more preferably 10 to 30.

The inventors' research into nonionic surfactants has revealed that when component (E) is replaced with PEG-10 isostearate, PEG-30 glyceryl trioleate, or PEG-40 glyceryl trioleate, which are polyhydric alcohol fatty acid esters obtained by esterifying a trihydric or lower polyhydric alcohol with a fatty acid, the stability over time of the resulting cleansing cosmetic tends to be impaired. Therefore, even when the cleansing cosmetic of one embodiment of the present invention contains PEG-10 isostearate, PEG-30 glyceryl trioleate, and PEG-40 glyceryl trioleate, the total content of these is preferably less than the content of component (E), more preferably 1% by mass or less, and even more preferably 0.1% by mass or less.

Component (F), water, may be any water typically used in preparing cosmetics, including, but not limited to, tap water, distilled water, purified water, and ion-exchanged water.

Component (F) acts to prevent the cleansing cosmetic from solidifying at low temperatures. However, if component (F) is present in excess, the transparency of the cleansing cosmetic tends to be impaired. Therefore, the content of component (F) is not particularly limited as long as it is an amount that prevents the cleansing cosmetic from solidifying at low temperatures without impairing transparency. From these perspectives, for example, it is preferably more than 0.5% by mass and less than 2.5% by mass, more preferably 0.8% to 2.3% by mass, and even more preferably 1.0% to 2.0% by mass.

In order for the cleansing cosmetic composition of one embodiment of the present invention to have both transparency and stability over time, the total content of components (A) to (F) is preferably 75% to 95% by mass, and more preferably 80% to 90% by mass.

The cleansing cosmetic composition of one embodiment of the present invention may contain other ingredients in addition to components (A) to (F), as long as the problem of the present invention can be solved.

The other ingredients are not particularly limited and include, for example, ingredients commonly used in cleansing cosmetics, such as oils, surfactants, moisturizers, stabilizers, fragrances, antioxidants, chelating agents, cosmetic ingredients, preservatives, pH adjusters, cooling agents, thickeners, and coloring materials. The content of the other ingredients can be appropriately determined by those skilled in the art, as long as it does not interfere with the solution of the problems of the present invention. Some of the other ingredients are listed below, but these are merely examples and are not limiting.

Oils are oils other than components (A) to (D), and examples include oils used as oil-based emollient ingredients and cleansing ingredients. Specific examples include vegetable oils such as Rosa canina fruit oil, grape seed oil, Argania spinosa kernel oil, coconut oil, palm oil, palm kernel oil, safflower oil, olive fruit oil, castor oil, avocado oil, sesame oil, tea seed oil, evening primrose oil, wheat germ oil, macadamia nut seed oil, hazelnut seed oil, kukui nut oil, rose hip oil, wild rose oil, meadowfoam oil, persic oil, tea tree oil, peppermint oil, corn oil, rapeseed oil, sunflower oil, linseed oil, cottonseed oil, soybean oil, peanut oil, rice bran oil, rice germ oil, cocoa butter, shea butter, hydrogenated coconut oil, and hydrogenated castor oil; polyisobutene, paraffin, polyolefin Examples of oils include linear and branched hydrocarbon oils such as propylene glycol and isoparaffin; higher fatty acids such as stearic acid, isostearic acid, behenic acid, undecylenic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, erucic acid, docosahexaenoic acid, eicosapentaenoic acid, isohexadecanoic acid, anteisohenicosanoic acid, and long-chain branched fatty acids; and higher alcohols such as cetyl alcohol, octyldodecanol, oleyl alcohol, stearyl alcohol, isostearyl alcohol, cetearyl alcohol, cetostearyl alcohol, behenyl alcohol, hexyldecanol, 2-decyltetradecynol, and monooleyl glyceryl ether (selachyl alcohol). These may be used alone or in combination of two or more. The oil content is preferably 1% to 20% by mass.

In one embodiment of the cleansing cosmetic of the present invention, the total content of oil components consisting of components (A) to (D) and the oil agent is preferably 75% to 95% by mass, and more preferably 80% to 90% by mass, from the viewpoint of imparting good cleansing power and emollient properties to the cleansing cosmetic.

Examples of surfactants include surfactants used as cleansing ingredients other than component (D), specifically polyethylene glycol fatty acid esters such as PEG-8 diisostearate, PEG-12 diisostearate, PEG-150 distearate, PEG-10 laurate, PEG-10 stearate, PEG-25 stearate, PEG-40 stearate, PEG-45 stearate, PEG-55 stearate, and PEG-10 oleate; fatty acid amides such as palm kernel fatty acid amide DEA; Glycerin fatty acid esters such as glyceryl stearate (SE); polyglycerin fatty acid esters such as polyglyceryl-6 laurate, polyglyceryl-10 myristate, polyglyceryl-10 stearate, and polyglyceryl-10 isostearate; polyoxyethylene glycerin fatty acid esters such as PEG-5 glyceryl stearate, PEG-15 glyceryl stearate, PEG-15 glyceryl isostearate, PEG-20 glyceryl triisostearate, and PEG-5 glyceryl oleate; coconut Sorbitan fatty acid esters such as sorbitan fatty acid, sorbitan oleate, sorbitan sesquioleate, and sorbitan palmitate; polyoxyethylene sorbitan fatty acid esters such as polysorbate 40, polysorbate 60, polysorbate 80, and PEG-20 sorbitan isostearate; polyoxyethylene hydrogenated castor oils such as PEG-20 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-60 hydrogenated castor oil, and PEG-50 hydrogenated castor oil triisostearate; polyoxyethylene cetyl ether (cetyl ether); Examples include polyoxyethylene alkyl ethers such as PPG-4 ceteth-1, PPG-8 ceteth-20, PPG-6 decyltetradeceth-12, and PPG-6 decyltetradeceth-20; polyoxyethylene polyoxypropylene alkyl ethers such as PPG-4 ceteth-1, PPG-8 ceteth-20, PPG-6 decyltetradeceth-12, and PPG-6 decyltetradeceth-20; and lecithin derivatives such as hydrogenated lecithin and hydrogenated lysolecithin. These can be used alone or in combination of two or more. The emulsifier content is preferably 0% to 15% by mass.

Humectants include, for example, glycerin, butylene glycol (BG), propylene glycol (PG), diglycerin, dipropylene glycol (DPG), methyl gluceth-10, methyl gluceth-20, PEG/PPG/polybutylene glycol-8/5/3 glycerin, hyaluronic acid and its salts and derivatives, polyquaternium, trehalose, xylitol, maltitol, maltose, sorbitol, glucose, fructose, hydrolyzed elastin, sodium lactate, cyclodextrin, and pyrrolidone carboxylic acid. These may be used alone or in combination of two or more. The content of the humectant is preferably 0% to 5% by mass.

Examples of stabilizers include ethanol, ascorbic acid, sodium ascorbate, erythorbic acid, citric acid, and sodium edetate. These can be used alone or in combination of two or more. The stabilizer content is preferably 0% to 5% by mass.

Fragrances may be commercially available or may be essential oils. Examples include wild rose oil, pelargonium graveolens oil, palmarosa oil, peppermint oil, Roman chamomile flower oil, and tea tree leaf oil. These may be used alone or in combination of two or more. The fragrance content is preferably 0% to 1% by mass.

Examples of antioxidants include vitamin E and its derivatives, such as dibutylhydroxytoluene (BHT), butylhydroxyanisole (BHA), and tocopherol; thiotaurine, evening primrose extract, beta-carotene, catechin compounds, flavonoid compounds, polyphenol compounds, and sodium pyrosulfite. These can be used alone or in combination of two or more. The antioxidant content is preferably 0% to 1% by mass.

Examples of chelating agents include alanine, disodium edetate (EDTA-2Na), sodium polyphosphate, sodium metaphosphate, sodium phytate, trisodium phosphate, and sodium gluconate. These can be used alone or in combination of two or more. The content of the chelating agent is preferably approximately 0% to 0.1% by mass.

Examples of beauty ingredients include apple tannin (apple fruit extract), licorice root extract, resveratrol, tuberose polysaccharide, citrus citrus fruit juice, tangerine peel extract, areca catechu extract, marjoram leaf extract, bean berry extract, morus alba root bark extract, hydrolyzed rice extract, hydrolyzed rice bran extract, fermented soy milk filtrate, bilberry leaf extract, and dipotassium glycyrrhizinate. These can be used alone or in combination of two or more. The content of the beauty ingredients is preferably 0% to 1% by mass.

Examples of preservatives include parahydroxybenzoic acid esters (methylparaben, propylparaben, etc.) and their sodium salts, phenoxyethanol, benzoic acid, benzoates, salicylic acid, salicylates, sorbic acid and its salts, chlorphenesin, hinokitiol, isopropylmethylphenol, parachlorophenol, benzalkonium chloride, chlorhexidine hydrochloride, trichlorocarbanilide, and photosensitizers. These can be used alone or in combination of two or more. The preservative content is preferably 0% to 1% by mass.

The cleansing cosmetic composition of one embodiment of the present invention is not particularly limited in terms of its function and/or effect, so long as it is used as a cleansing cosmetic composition. It is preferable that the cleansing cosmetic composition of one embodiment of the present invention has good cleansing power, transparency, and stability over time.

The cleansing power of the cleansing cosmetic of one embodiment of the present invention is preferably such that it can be evaluated as "Good" by, for example, the method described in the Examples below, whereby no makeup cosmetic remains on the skin surface or in the skin grooves after cleansing.

The transparency of the cleansing cosmetic composition of one embodiment of the present invention is preferably such that, when left to stand at 20°C for at least 24 hours, for example, according to the method described in the Examples below, and then shaken and stirred in the container again to make it homogenous, and then left to stand with a white paper background with a black line drawn on it, it is clear and transparent, and the black line in the background is visible, so that it is rated as "Good."

The stability over time of the cleansing cosmetic composition of one embodiment of the present invention is preferably evaluated as "Good" when, for example, it is stored stationary for one month at 50°C or at 50°C and 5°C, as determined by the method described in the Examples below, and no separation, white turbidity, and/or solidification is observed.

The feel when using the cleansing cosmetic of one embodiment of the present invention is not particularly limited, but for example, in a sensory evaluation described in the Examples below, it is preferable that the average scores for the five categories of "absence of friction," "good spreadability," "absence of stickiness," "absence of sliminess," and "absence of dryness" are all at least 3 points, more preferably the average score for at least one of these categories is 4 points or higher, and even more preferably the average scores for two or more or three or more of these categories are 4 points or higher.

A specific embodiment of the cleansing cosmetic of one aspect of the present invention is a cleansing cosmetic containing 25% to 70% by mass of component (A), 0.1% to 20% by mass of component (B), 0.1% to 50% by mass of component (C), more than 10% to 40% by mass of component (D), 0.1% to 20% by mass of component (E), and more than 0.5% to less than 2.5% by mass of component (F).

Another specific embodiment of the cleansing cosmetic of one aspect of the present invention is a cleansing cosmetic containing 29% to 60% by mass of component (A), 1% to 15% by mass of component (B), 1% to 40% by mass of component (C), 12% to 35% by mass of component (D), 0.5% to 10% by mass of component (E), and 0.8% to 2.3% by mass of component (F).

Another specific embodiment of the cleansing cosmetic of one aspect of the present invention is a cleansing cosmetic containing 30% to 55% by mass of component (A), 3% to 12% by mass of component (B), 3% to 35% by mass of component (C), 15% to 30% by mass of component (D), 1% to 5% by mass of component (E), and 1.0% to 2.0% by mass of component (F).

In a specific embodiment of the cleansing cosmetic composition according to one aspect of the present invention described above, the ratio of the content of component (A) to the content of component (D) ((A)/(D)) is preferably less than 5.4, 0.5 to 5.0, or 1.0 to 3.5; the ratio of the content of component (A) to the content of component (E) ((A)/(E)) is preferably 3 to 50, 5 to 40, or 10 to 30; and/or the total content of components (A) to (F) is preferably 75% to 95% by mass or 80% to 90% by mass.

The method for producing the cleansing cosmetic composition of one embodiment of the present invention is not particularly limited, and it can be produced by, for example, mixing components (A) to (F) and any other ingredients until the composition is homogeneous overall. If any of the other ingredients have solidified, it is preferable to heat them to dissolve them beforehand. The temperature at which the ingredients are heated is not particularly limited, but is, for example, 65°C to 85°C.

The cleansing cosmetic composition of one embodiment of the present invention is not particularly limited in its mode of use or formulation, and can be used, for example, as a cleansing oil. Furthermore, the cleansing cosmetic composition of one embodiment of the present invention may also be used as a cleansing gel by using a thickener. Furthermore, the cleansing cosmetic composition of one embodiment of the present invention can be impregnated into a sheet or sprayed. Therefore, the cleansing cosmetic composition of one embodiment of the present invention can be in the form of an impregnated sheet, a pump spray, or the like.

The cleansing cosmetic of one embodiment of the present invention can be used to remove oily dirt such as makeup cosmetics and skin dirt. The method of use of the cleansing cosmetic of one embodiment of the present invention is not particularly limited, and a method may be selected appropriately depending on the mode of use and formulation. For example, if the cleansing cosmetic of one embodiment of the present invention is a cleansing oil, an appropriate amount is taken in the hand, applied to the face, and thoroughly blended into the makeup cosmetics or skin, and then rinsed with running water to remove oily dirt from the skin together with the cleansing oil. Furthermore, it is expected that the skin will be moisturized and retain moisture after using the cleansing cosmetic of one embodiment of the present invention.

The present invention will be explained in more detail below using examples, but the present invention is not limited to these examples. The present invention can take various forms as long as the object of the present invention is solved. The values in the table represent mass % (% (w/w)).

[Example 1. Sensory evaluation of squalane-containing cleansing cosmetics]
(1-1) Preparation of Cleansing Cosmetic Preparation The components shown in Table 1 were placed in a beaker in the following order. The components in the beaker were manually stirred at room temperature to prepare a cleansing cosmetic preparation. However, only PEG-12 diisostearate in the table was dissolved by heating in a water bath at 80°C beforehand.

(1-2) Sensory Evaluation Method Five trained panelists applied the cleansing cosmetic directly to their faces and then rated the following on a 5-point scale (5 being the highest and 1 being the lowest) to determine the average score and standard deviation across the panelists: "absence of friction" (when applying and spreading the cleansing cosmetic on the face, no feeling of resistance between the face and fingers), "good spreadability" (when applying and spreading the cosmetic on the face, the cosmetic can be spread smoothly without the application of significant force), "absence of stickiness" (after rinsing off the cosmetic from the face, no feeling of stickiness as if the face and fingers are sticking together), "absence of stickiness" (after rinsing off the cosmetic from the face, no feeling of residual oiliness as if the cosmetic's oily components remain on the skin), and "absence of dryness" (after rinsing off the cosmetic from the face and wiping off moisture, no feeling of excessive oil being washed away from the skin).

(1-3) Sensory Evaluation Results The results of the sensory evaluation are shown in Table 1. As shown in Table 1, the cleansing cosmetic of Example 1, which used squalane as the hydrocarbon oil, was superior in "freedom from friction,""goodspreadability,""freedom from stickiness," and "freedom from dryness" compared to the cleansing cosmetics of Reference Examples 1 and 2, which used mineral oil and an olefin oligomer. Furthermore, the cleansing cosmetic of Example 1 was comparable to or superior to the cleansing cosmetics of Reference Examples 1 and 2 in "freedom from stickiness."

Taking these results into consideration, it was found that cleansing cosmetics that use squalane as a hydrocarbon oil have a superior feel when used compared to cleansing cosmetics that use other hydrocarbon oils.

[Example 2. Evaluation of physical properties of cleansing cosmetics]
(2-1) Preparation of Cleansing Cosmetics Cleansing cosmetics were prepared using the components shown in Tables 2 and 3 in the same manner as in (1-1) above.

(2-2) Transparency The cleansing cosmetic sample was placed in a standard glass bottle (7K bottle), left to stand at 20°C for 24 hours or more, and then the container was shaken and stirred again to make it uniform. When the stirred container was left to stand with a white paper background with a black line drawn on it, the transparency was evaluated as "Good" if it was clear and the black line was visible, and the transparency was evaluated as "Poor" if it was cloudy and the black line was not visible.

(2-3) Stability over time The cleansing cosmetic samples after trial manufacture were placed in standard glass bottles (7K bottles) and stored at 50°C as harsh test conditions. The presence or absence of separation was visually confirmed immediately after removal every week for one month. The samples were then left to stand at 20°C for 24 hours or more, and then stirred to confirm the presence or absence of white turbidity. A case in which no separation and no white turbidity occurred was evaluated as "Good," and a case in which separation and/or white turbidity was observed was evaluated as "Poor." Furthermore, for the samples stored at 5°C, in addition to the evaluation method similar to that for 20°C, the samples were visually inspected immediately after removal from the 5°C thermostatic chamber. A case in which no solidified cleansing cosmetic was observed at the bottom of the bottle was evaluated as "Good," and a case in which solidified cleansing cosmetic was observed was evaluated as "Poor."

(2-4) Cleansing Power A rice-grain-sized amount of commercially available makeup cosmetic (foundation or lipstick) was evenly applied to the inside of the forearm so as to cover an area of 1.5 cm in diameter, and then 20 μL of the cleansing cosmetic was dropped onto the skin and massaged in with a finger for 15 seconds. The skin was then rinsed with running water for 30 seconds, and the skin condition before and after cleansing was observed under a microscope at 50x magnification. If no makeup cosmetic remained on the skin surface or in the skin grooves after cleansing, the result was evaluated as "Good," and if any remained, the result was evaluated as "Poor."

(2-5) Evaluation Results The evaluation results of the cleansing cosmetics are shown in Tables 2 and 3.

As shown in Table 2, cleansing cosmetics containing squalane, jojoba seed oil, ester oil, water, a specific silicone oil, and a specific nonionic surfactant generally exhibited excellent transparency, stability over time, and cleansing power.

In contrast, as shown in Table 3, cleansing cosmetics that contained squalane but did not contain ester oil, a specific silicone oil, or a specific nonionic surfactant had poor transparency or stability over time. Furthermore, cleansing cosmetics with an insufficient content of a specific silicone oil or an excessive amount of water had poor transparency. Furthermore, cleansing cosmetics with no water or an insufficient water content solidified at the bottom of the container when stored at low temperatures.

On the other hand, as shown in Table 3, the cleansing cosmetics of Reference Examples 3 and 4, which used mineral oil instead of squalane, did not suffer from any effect on transparency, stability over time, or cleansing power, even though they did not contain ester oil or specific silicone oil.

As described above, when squalane is used as the base of a cleansing cosmetic, it has been found that by combining jojoba seed oil, ester oil, water, a specific silicone oil, and a specific nonionic surfactant, a cleansing cosmetic with excellent transparency, stability over time, and cleansing power can be obtained.

The cleansing cosmetic of one embodiment of the present invention has a base of squalane, which has both cleansing power and a high emollient effect, and further contains jojoba seed oil, which has a high emollient effect. However, since the cleansing cosmetic also contains ester oil, water, a specified nonionic surfactant, and a specified silicone oil, it has good cleansing power and transparency, and can be used as skin care cosmetics such as cleansing oil, impregnated sheets, and sprays to remove oily stains on the skin, including makeup cosmetics and skin dirt.

Claims (6)

(A) squalane,
(B) jojoba seed oil;
(C) an ester oil;
(D) a silicone oil which is a methylphenylpolysiloxane having a phenyl group and a trimethylsiloxy group;
(E) a nonionic surfactant which is a polyoxyethylene sorbitol fatty acid ester having four or more ester bonds (excluding sorbeth-40 tetraoleate);
(F) water ,
The content of the component (D) is more than 10% by mass and not more than 40% by mass,
The component (D) is at least one selected from the group consisting of diphenylsiloxyphenyl trimethicone and phenyl trimethicone, and
The cleansing cosmetic contains the component (F) in an amount of 0.8% by mass to 2.3% by mass . The cleansing cosmetic according to claim 1, wherein the ratio of the content of component (A) to the content of component (D) ((A)/(D)) is 0.5 to 5.0, and/or the ratio of the content of component (A) to the content of component (E) ((A)/(E)) is 5 to 40. The cleansing cosmetic according to claim 1, wherein the content of component (A) is 29% to 60% by mass. The cleansing cosmetic according to claim 1, wherein the total content of components (A) to (F) is 80% to 90% by mass. 5. The cleansing cosmetic composition according to claim 1 , wherein the component (E) is at least one selected from the group consisting of sorbeth tetraoleate and sorbeth pentaoleate. Squalane having a content of 29% by mass to 60% by mass;
Jojoba seed oil having a content of 1% by mass to 15% by mass;
An ester oil having a content of 1% by mass to 40% by mass;
a silicone oil that is a methylphenylpolysiloxane having a phenyl group and a trimethylsiloxy group , the content of which is 12% by mass to 35% by mass, and which is at least one selected from the group consisting of diphenylsiloxyphenyltrimethicone and phenyltrimethicone ;
a nonionic surfactant which is a polyoxyethylene sorbitan fatty acid ester having four or more ester bonds, the content of which is 0.5% by mass to 10% by mass (excluding sorbeth-40 tetraoleate);
and water in a content of 0.8% by mass to 2.3% by mass.