Cosmetic ester oil and cosmetic

Abstract

The purpose of the present invention is to provide: a cosmetic ester oil having excellent wettability and dispersion performance with respect to pigments and excellent skin compatibility; and a cosmetic containing the cosmetic ester oil. This cosmetic ester oil comprises an ester A (ester of dodecanoic acid and a C4-18 saturated monohydric alcohol) and an ester B (ester of tridecanoic acid and a C4-18 saturated monohydric alcohol), the mass ratio of the ester A to the ester B being 99.99:0.01 to 95.0:5.0.

Description

Ester Oil for Cosmetics and Cosmetics

[0001] The present invention relates to an ester oil for cosmetics and a cosmetic containing the same.

[0002] Various oil agents are used as base materials for cosmetics such as makeup cosmetics, skincare cosmetics, body care cosmetics, and hair care cosmetics, in order to control the feel of cosmetics or to impart functionality to cosmetics. In general, oil agents have high affinity to the skin and prevent moisture transpiration, so it is possible to impart skin protection effects, emollient effects, and treatment effects to cosmetics.

[0003] The functions required of oil agents for cosmetics vary depending on the application. For example, in the case of cleansing cosmetics, excellent usability such as good compatibility with skin and excellent cleansing power are required. As oil agents, for example, esters of fatty acids and alcohols are known. Patent Document 1 discloses that a cosmetic containing octyl palmitate, isopropyl palmitate and the like causes less skin irritation and has excellent makeup removal performance.

[0004] For example, Patent Document 2 discloses that a cleansing cosmetic containing an ester oil having a relative dielectric constant of 2.6 to 3.6 has excellent cleansing power.

[0005] Japanese Patent Application Laid-Open No. 2000-229814 Japanese Patent Application Laid-Open No. 2023-105025

[0006] In recent years, due to the increased frequency of wearing makeup along with more opportunities to go out and the rising awareness of skincare, there has been an increasing demand for removing makeup quickly, easily and thoroughly. Accordingly, there has been a growing demand for cleansing cosmetics that are excellent in wettability and dispersion performance for pigments contained in foundations and the like, as well as in compatibility with skin, and can quickly remove foundations and the like.

[0007] The present invention has been made in view of the above circumstances, and an object thereof is to provide an ester oil for cosmetics that is excellent in wettability and dispersion performance to pigments, and in compatibility with skin, and a cosmetic containing the same.

[0008] The present inventors conducted diligent research to solve the above problems and found that a cosmetic ester oil containing a specific ester A and a specific ester B in a specific ratio exhibits excellent wettability and dispersion performance for pigments, as well as skin compatibility. Based on this finding, the present invention is as follows.

[0009] [1] Cosmetic ester oils containing the following ester A and ester B, wherein the mass ratio of ester A to ester B is 99.99:0.01 to 95.0:5.0: Ester A: an ester of dodecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms, Ester B: an ester of tridecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms.

[0010] [2] The cosmetic ester oil according to [1], wherein the saturated monohydric alcohol having 4 to 18 carbon atoms, which is the raw material for ester A, is a saturated monohydric alcohol having 4 to 14 carbon atoms, preferably a saturated monohydric alcohol having 4 to 8 carbon atoms, more preferably a linear saturated alcohol having 4 to 8 carbon atoms, and even more preferably 1-hexanol.

[0011] [3] The cosmetic ester oil according to [1] or [2], wherein the saturated monohydric alcohol having 4 to 18 carbon atoms, which is the raw material for ester B, is a saturated monohydric alcohol having 4 to 14 carbon atoms, preferably a saturated monohydric alcohol having 4 to 8 carbon atoms, more preferably a linear saturated alcohol having 4 to 8 carbon atoms, and even more preferably 1-hexanol.

[0012] [4] The cosmetic ester oil according to any one of [1] to [3] above, wherein the mass ratio of ester A to ester B is 99.99:0.01 to 96.0:4.0, preferably 99.99:0.01 to 98.0:2.0, more preferably 99.95:0.05 to 99.0:1.0, and even more preferably 99.95:0.05 to 99.5:0.5.

[0013] [5] Cosmetic ester oil according to any one of [1] to [4], further containing the following ester C: Ester C: Ester of undecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms.

[0014] [6] The cosmetic ester oil according to [5], wherein the saturated monohydric alcohol having 4 to 18 carbon atoms, which is the raw material for ester C, is a saturated monohydric alcohol having 4 to 14 carbon atoms, preferably a saturated monohydric alcohol having 4 to 8 carbon atoms, more preferably a linear saturated alcohol having 4 to 8 carbon atoms, and even more preferably 1-hexanol.

[0015] [7] The cosmetic ester oil according to [5] or [6], wherein the content of ester C is 0.01 parts by mass or more, preferably 0.05 parts by mass or more, and more preferably 0.1 parts by mass or more, based on 100 parts by mass of the total of ester A and ester B.

[0016] [8] The cosmetic ester oil according to any one of [5] to [7], wherein the content of ester C is 3 parts by mass or less, preferably 1 part by mass or less, and more preferably 0.5 parts by mass or less, based on 100 parts by mass of the total of ester A and ester B.

[0017] [9] A cosmetic containing the cosmetic ester oil described in any one of [1] to [8] above.

[0018] The ester oil of the present invention has excellent wettability and dispersion properties for pigments, as well as skin compatibility.

[0019] The present invention will be described in order below. In this specification, numerical ranges defined using "~" include the values ​​at both ends (upper and lower limits) of "~". For example, "2~5" means "2 or more, and 5 or less". In addition, each description in this specification can be combined with one another unless it is clearly stated that they cannot be combined.

[0020] <Ester Oil for Cosmetics> The present invention provides ester oil for cosmetics. In this specification, "ester oil for cosmetics" means ester oil used in cosmetics, and "ester oil" means an ester of a fatty acid and an alcohol that is liquid at room temperature and immiscible with water. Hereinafter, "ester oil for cosmetics" may be abbreviated as "ester oil".

[0021] The ester oil of the present invention contains the following esters A and B, and the mass ratio of ester A to ester B is 99.99:0.01 to 95.0:5.0; Ester A: an ester of dodecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms; Ester B: an ester of tridecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms. The components of the ester oil of the present invention will be described in order below.

[0022] <Ester A> Ester A is an ester of dodecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms. Ester A may be used alone or in combination of two or more types.

[0023] As the dodecanoic acid used as the raw material for ester A, commercially available products from Sigma-Aldrich, Tokyo Chemical Industries, Fujifilm Wako Pure Chemical Industries, Kanto Chemical Co., Ltd., etc., can be used.

[0024] The monohydric alcohol used as a raw material for ester A has 4 to 18 carbon atoms. If the number of carbon atoms is 19 or more, sufficient wettability and dispersion performance for the pigment may not be obtained, and if the number of carbon atoms is 3 or less, sufficient skin compatibility may not be obtained.

[0025] Examples of saturated monohydric alcohols with 4 to 18 carbon atoms that serve as raw materials for ester A include 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 2-methylpropanol, isobutanol, isooctanolan, 2-ethylhexanol, isononanol, 3,5,5-trimethylhexanol, isodecanol, isododecanol, isotridecanol, isostearyl alcohol, 2-hexyldecanol, and 3-methyl-1-butanol. Commercially available saturated monohydric alcohols with 4 to 18 carbon atoms can be used.

[0026] The saturated monohydric alcohol having 4 to 18 carbon atoms, which is the raw material for ester A, is preferably a saturated monohydric alcohol having 4 to 14 carbon atoms, more preferably a saturated monohydric alcohol having 4 to 8 carbon atoms, even more preferably a linear saturated alcohol having 4 to 8 carbon atoms, and particularly preferably 1-hexanol, from the viewpoint of wettability and dispersion performance for pigments and skin compatibility.

[0027] <Ester B> Ester B is an ester of tridecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms. Ester B may be used alone or in combination of two or more types.

[0028] As the tridecanoic acid used as the raw material for ester B, commercially available products from companies such as Sigma-Aldrich, Tokyo Chemical Industries, Fujifilm Wako Pure Chemical Industries, and Kishida Chemical Co., Ltd. can be used.

[0029] The saturated monohydric alcohol, which is the raw material for ester B, has 4 to 18 carbon atoms. If the number of carbon atoms is 19 or more, sufficient wettability and dispersion performance for the pigment may not be obtained, and if the number of carbon atoms is 3 or less, sufficient skin compatibility may not be obtained.

[0030] Examples of saturated monohydric alcohols with 4 to 18 carbon atoms that serve as raw materials for ester B include 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 2-methylpropanol, isobutanol, isooctanolan, 2-ethylhexanol, isononanol, 3,5,5-trimethylhexanol, isodecanol, isododecanol, isotridecanol, isostearyl alcohol, 2-hexyldecanol, and 3-methyl-1-butanol. Commercially available saturated monohydric alcohols with 4 to 18 carbon atoms can be used.

[0031] The saturated monohydric alcohol having 4 to 18 carbon atoms, which is the raw material for ester B, is preferably a saturated monohydric alcohol having 4 to 14 carbon atoms, more preferably a saturated monohydric alcohol having 4 to 8 carbon atoms, even more preferably a linear saturated alcohol having 4 to 8 carbon atoms, and particularly preferably 1-hexanol, from the viewpoint of wettability and dispersion performance for pigments and skin compatibility.

[0032] <Mass ratio of ester A to ester B> The mass ratio of ester A to ester B in the ester oil of the present invention (hereinafter sometimes abbreviated as "A:B") is 99.99:0.01 to 95.0:5.0. From the viewpoint of wettability and dispersion performance for pigments, as well as skin compatibility, A:B is preferably 99.99:0.01 to 96.0:4.0, more preferably 99.99:0.01 to 98.0:2.0, even more preferably 99.95:0.05 to 99.0:1.0, and particularly preferably 99.95:0.05 to 99.5:0.5.

[0033] <Ester C> The ester oil of the present invention may contain, as ester C, an ester of undecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms. Ester C may be used alone or in combination of two or more types.

[0034] As the raw material for ester C, undecanoic acid can be purchased from companies such as Sigma-Aldrich and Fujifilm Wako Pure Chemical Industries.

[0035] The number of carbon atoms in saturated monohydric alcohols, which are the raw materials for ester C, ranges from 4 to 18. If the number of carbon atoms is 19 or more, sufficient wettability and dispersion performance for pigments may not be obtained, and if the number of carbon atoms is 3 or less, sufficient skin compatibility may not be obtained.

[0036] Examples of saturated monohydric alcohols with 4 to 18 carbon atoms that serve as raw materials for ester C include 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-decanol, 1-undecanol, 1-dodecanol, 1-tridecanol, 1-tetradecanol, 1-pentadecanol, 1-hexadecanol, 1-heptadecanol, 1-octadecanol, 2-methylpropanol, isobutanol, isooctanolan, 2-ethylhexanol, isononanol, 3,5,5-trimethylhexanol, isodecanol, isododecanol, isotridecanol, isostearyl alcohol, 2-hexyldecanol, and 3-methyl-1-butanol. Commercially available saturated monohydric alcohols with 4 to 18 carbon atoms can be used.

[0037] The saturated monohydric alcohol having 4 to 18 carbon atoms, which is the raw material for ester C, is preferably a saturated monohydric alcohol having 4 to 14 carbon atoms, more preferably a saturated monohydric alcohol having 4 to 8 carbon atoms, even more preferably a linear saturated alcohol having 4 to 8 carbon atoms, and particularly preferably 1-hexanol, from the viewpoint of wettability and dispersion performance for pigments and skin compatibility.

[0038] The content of ester C in the ester oil of the present invention is not particularly limited, as long as it does not impair the effects of the present invention. When ester C is used, its content in the ester oil of the present invention is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, even more preferably 0.1 parts by mass or more, preferably 3 parts by mass or less, more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less, based on 100 parts by mass of the total of ester A and ester B, from the viewpoint of wettability and dispersion performance for pigments and skin compatibility.

[0039] <Other Esters> The ester oil of the present invention may contain other esters different from ester A, ester B, and ester C. Only one of these other esters may be used, or two or more may be used in combination.

[0040] Examples of other esters include esters of saturated or unsaturated fatty acids having 8 to 10 or 14 to 18 carbon atoms and saturated monohydric alcohols having 4 to 18 carbon atoms.

[0041] The content of other esters in the ester oil of the present invention is not particularly limited as long as it does not impair the effects of the present invention. When other esters are used, from the viewpoints of wettability and dispersion performance to pigments, as well as skin compatibility, the content thereof in the ester oil of the present invention is preferably 2 parts by mass or less, more preferably 1 part by mass or less, per 100 parts by mass in total of ester A and ester B. More preferably, the ester oil of the present invention does not contain any other esters.

[0042] <Synthesis of Esters> Any of ester A, ester B, ester C, and other esters can be synthesized by a conventional esterification reaction or transesterification reaction (preferably an esterification reaction). Regarding the carboxylic acid and monohydric alcohol, which are the raw materials used in the esterification reaction, the amount of the monohydric alcohol is preferably 0.8 to 1.5 equivalents, more preferably 0.9 to 1.2 equivalents, relative to the carboxylic acid.

[0043] In the esterification reaction or transesterification reaction, a catalyst may be used as necessary. Examples of such catalysts include Brønsted acids such as sulfuric acid, methanesulfonic acid, and p-toluenesulfonic acid, and Lewis acid catalysts such as titanium, zirconium, hafnium, tin, and zinc.

[0044] The esterification reaction is carried out at 160°C or higher under a nitrogen stream, until the decrease in the acid value or hydroxyl value of the reaction mixture per hour is preferably 2.0 mgKOH / g or less, more preferably 1.0 mgKOH / g or less.

[0045] After completion of the esterification reaction or transesterification reaction, in order to remove excess alcohol or by-products in the crude product, it is preferable to distill them off under reduced pressure conditions under a nitrogen stream. The distillation of alcohol or by-products is preferably carried out at a temperature of 160°C or higher and a pressure of 100 Torr or lower.

[0046] After completion of the esterification reaction, it is preferable to neutralize the carboxylic acid with an alkali in order to remove excess carboxylic acid in the crude product. Examples of usable alkalis include sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and the like. It is preferable to use an aqueous alkali solution with a concentration of 5 to 15% by mass. During neutralization, the above aqueous alkali solution is added to the crude product, followed by stirring and standing, and the separated aqueous carboxylate solution in the lower layer is removed. Thereafter, in order to further remove carboxylate salts from the crude product, it is preferable to wash the organic layer with water (warm water washing). Washing with water is performed by adding warm water at 60 to 90°C to the organic layer, stirring the mixture, allowing it to stand, and removing the aqueous layer in the lower layer.

[0047] After neutralizing the carboxylic acid with an alkali and washing with water, if necessary, it is preferable to purify the ester by performing operations such as adsorption treatment using activated clay, acid clay, and synthetic adsorbents, or steaming, either alone or in combination.

[0048] <Production of Ester Oil> The ester oil of the present invention can be produced by mixing and stirring ester A and ester B obtained as described above, and optionally ester C and other esters, as necessary.

[0049] <Cosmetics> The present invention provides a cosmetic containing the ester oil of the present invention. Only one type of the ester oil of the present invention may be used, or two or more types may be used in combination.

[0050] The content of the ester oil of the present invention in the cosmetic of the present invention is preferably 0.001 to 90% by mass, more preferably 0.1 to 50% by mass, and still more preferably 0.1 to 20% by mass, relative to the total mass of the cosmetic.

[0051] The cosmetic composition of the present invention may contain other components different from the ester oil of the present invention described above. Examples of other components include powder components, liquid oils and fats, solid oils and fats, waxes, hydrocarbons, higher fatty acids, higher alcohols, silicones, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, water-soluble polymers, thickeners, film-forming agents, UV absorbers, metal ion chelating agents, lower alcohols, polyhydric alcohols, sugars, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, fragrances, water, and the like. Any of these other components may be used individually or in combination of two or more.

[0052] The cosmetic composition of the present invention can be used, for example, as a cleansing cosmetic, a moisturizing cosmetic, a sunscreen cosmetic, etc. Examples of cleansing cosmetics include cleansing oil, cleansing liquid, cleansing gel, and cleansing cream. Examples of moisturizing cosmetics include moisturizing cream. Examples of sunscreen cosmetics include sunscreen cream. The cosmetic composition of the present invention is preferably a cleansing cosmetic.

[0053] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. In the following, "%" and "parts" refer to "mass percent" and "parts by mass," respectively.

[0054] (Synthesis Example 1: Synthesis of Hexyl Dodecanoate) 489 g of 1-hexanol (manufactured by Tokyo Chemical Industry Co., Ltd.) and 911 g of dodecanoic acid (manufactured by NOF Corporation, "NAA-122") were charged into a four-necked flask equipped with a thermometer, nitrogen inlet tube, stirrer, Liebig condenser, and oil-water separator. The reaction was carried out under a nitrogen atmosphere at 160°C and atmospheric pressure, while removing the reaction water by distillation. The acid value was measured every hour and the reaction was continued until the decrease in acid value per hour was 1 mg KOH / g or less to obtain the crude ester. Then, the mixture was neutralized at 85°C, washed with water, and dehydrated to remove excess fatty acids. Finally, the mixture was filtered to obtain hexyl dodecanoate.

[0055] (Synthesis Example 2: Synthesis of Hexyl Tridecanoate) 489 g of 1-hexanol (manufactured by Tokyo Chemical Industry Co., Ltd.) and 911 g of tridecanoic acid (manufactured by Sigma-Aldrich) were charged into a four-necked flask equipped with a thermometer, nitrogen inlet tube, stirrer, Liebig condenser, and oil-water separator. The reaction was carried out under a nitrogen atmosphere at 160°C and atmospheric pressure, while removing the reaction water by distillation. The acid value was measured every hour and the reaction was continued until the decrease in acid value per hour was 1 mg KOH / g or less to obtain the crude ester. Then, the mixture was neutralized at 85°C, washed with water, and dehydrated to remove excess fatty acids. Finally, the mixture was filtered to obtain hexyl tridecanoate.

[0056] (Synthesis Example 3: Synthesis of Hexyl Undecanoate) 489 g of 1-hexanol (manufactured by Tokyo Chemical Industry Co., Ltd.) and 911 g of undecanoic acid (manufactured by Sigma-Aldrich) were charged into a four-necked flask equipped with a thermometer, nitrogen inlet tube, stirrer, Liebig condenser, and oil-water separator. The reaction was carried out under a nitrogen atmosphere at 160°C and atmospheric pressure, while removing the reaction water by distillation. The acid value was measured every hour and the reaction was continued until the decrease in acid value per hour was 1 mg KOH / g or less to obtain the crude ester. Then, the mixture was neutralized at 85°C, washed with water, and dehydrated to remove excess fatty acids. Finally, the mixture was filtered to obtain hexyl undecanoate.

[0057] (Examples 1-4 and Comparative Examples 1 and 2: Preparation of Ester Oils) Each ester from Synthesis Examples 1-3 was weighed into a flask in the amounts shown in Table 1, heated to 80°C, and stirred for 30 minutes to prepare ester oils 1-6 of Examples 1-4 and Comparative Examples 1 and 2, respectively.

[0058]

[0059] (Evaluation of Wettability and Dispersion Performance with Respect to Pigments) The wettability and dispersion performance of each ester oil with respect to pigments were evaluated. As the pigment, red iron oxide (TAROX Synthetic Iron Oxide R-800HP, manufactured by Titanium Industries Co., Ltd.), which is commonly used in foundations, was used. Each ester oil was gradually added dropwise to 10 g of each pigment, and the pigment and each ester oil were mixed. The wetting point and pour point were measured, and the wettability of the ester oil with respect to the pigment (i.e., the ease with which the ester oil adheres to the pigment) and the dispersion performance of the ester oil were evaluated according to the following criteria. The results are shown in Table 2.

[0060] The "wetting point" refers to the amount (in grams) of ester oil required to uniformly wet 10 grams of pigment, and is an indicator of the wettability of ester oil to pigment. Ester oils with lower wetting points have higher wettability to pigments.

[0061] The "pour point" refers to the amount of ester oil (in grams) required for a mixture (dispersion system) of 10 g of pigment and ester oil to exhibit fluidity, and is an indicator of the dispersion performance of the ester oil relative to the pigment. Ester oils with a smaller difference between the pour point and the wetting point have higher dispersion performance relative to the pigment.

[0062] <Evaluation Criteria for Wettability of Pigments> ◎: Wetting point less than 4.5g 〇: Wetting point 4.5g or more and less than 4.8g ×: Wetting point 4.8g or more Note that the wetting point is also indicated in parentheses in Table 2.

[0063] <Evaluation Criteria for Dispersion Performance of Pigments> ◎: Difference between pour point and wet point is less than 6.5 g 〇: Difference between pour point and wet point is 6.5 g or more and less than 6.8 g ×: Difference between pour point and wet point is 6.8 g or more Note that the difference between pour point and wet point is also indicated in parentheses in Table 2.

[0064] (Evaluation of Skin Compatibility) The skin compatibility of each ester oil was evaluated. For the test, 1.5 μL of each ester oil was dropped onto artificial skin, and the contact angle 500 ms after dropping (hereinafter referred to as "contact angle at 500 ms") and the contact angle 9500 ms after dropping (hereinafter referred to as "contact angle at 9500 ms") were measured using a contact angle meter (Kyowa Interface Science Co., Ltd. "Fully Automatic Contact Angle Meter DM-701"), and the skin compatibility of the ester oil was evaluated according to the following criteria. The results are shown in Table 2. Note that the larger the difference between the contact angle at 500 ms and the contact angle at 9500 ms, the higher the skin compatibility of the ester oil.

[0065] <Criteria for evaluating skin compatibility> ◎: The difference between the contact angle at 500 ms and the contact angle at 9500 ms is 1.00° or more. ○: The difference between the contact angle at 500 ms and the contact angle at 9500 ms is 0.25° or more and less than 1.00°. ×: The difference between the contact angle at 500 ms and the contact angle at 9500 ms is less than 0.25°. Note that in Table 2, the difference between the contact angle at 500 ms and the contact angle at 9500 ms is also indicated in parentheses.

[0066]

[0067] Table 2 shows that ester oils 1 to 4 of Examples 1 to 4 exhibit excellent wettability and dispersion performance for pigments, as well as skin compatibility. On the other hand, ester oils 5 and 6 of Comparative Examples 1 and 2, in which the mass ratio of ester A:ester B was outside the range of the present invention, exhibited inferior wettability and dispersion performance for pigments, as well as skin compatibility.

[0068] <Example of Cosmetic Formulation> An example of a cosmetic formulation containing ester oil 1 from Example 1 is described below. Note that the amounts of each component shown below are based on the total amount of each cosmetic.

[0069] [Formulation Example 1] Cleansing Oil Hydrogenated Polyisobutene: 19.5% Ester Oil 1: 28.0% PPG-52 Butyl: 2.0% Sorbitan Tetraisostearate-30: 21.0% Sorbitan Oleate: 3.5% Glyceryl Dodecanoate: 3.0% Polysorbate 20: 6.6% Ethyl Oleate: 6.0% PPG-10 Buteth-9: 6.5% Water: 4.0%

[0070] [Formulation Example 2] Cleansing Liquid Hydrogenated Polyisobutene: 10.0% Ester Oil 1: 5.0% PEG-7 Glyceryl Cocoate: 24.0% Glycereth-7: 6.0% Glycerin: 27.0% Sodium Cocoyl Methyl Taurate: 1.0% Water: 27.0%

[0071] [Formulation Example 3] Cleansing Gel Water: 26.5% Acrylates / C10-30 Alkyl Acrylate Crosspolymer: 0.43% Hydrogenated Polyisobutene: 10.0% Ester Oil 1: 5.0% PEG-7 Glyceryl Cocoate: 24.0% Glycereth-7: 6.0% Glycerin: 19.0% 1,3-Butylene Glycol: 9.0% Potassium Hydroxide Aqueous Solution (Concentration: 48%): 0.07%

[0072] [Formulation Example 4] Cleansing Cream Hydrogenated polyisobutene: 40.0% PPG-52 Butyl: 2.0% Ester Oil 1: 12.0% PPG-13 Decyltetradeceth-24: 0.5% PPG-20 Decyltetradeceth-10: 1.0% Glyceryl Stearate: 2.0% Polysorbate 60: 2.0% Cetyl Alcohol: 1.20% Stearyl Alcohol: 0.8% Sorbitol: 14.9% Water: 18.5% 1,3-Butylene Glycol: 3.0% Sodium Lauryl Sulfate: 0.1% Sodium Stearoyl Glutamate: 1.0% Polyquaternium-51: 0.5% Phenoxyethanol: 0.5%

[0073] [Formulation Example 5] Moisturizing Cream Glycerin: 1.0% 1,3-Butylene Glycol: 2.0% 1,3-Propanediol: 0.5% Pentylene Glycol: 2.0% 1,2-Hexanediol: 0.5% PEG-32: 1.0% Sodium Hyaluronate: 0.1% Hydrolyzed Collagen: 0.01% Sorbitan Oleate: 2.0% Glyceryl Oleate: 1.0% Polysorbate 80: 0.5% Hydroxyethylcellulose: 0.1% Magnesium Sulfate: 0.2% Ascorbyl Glucoside: 2.0% Niacinamide: 1.0% Tranexamic Acid: 2.0% Allantoin: 0.1% Dipotassium Glycyrrhizate: 0.05% (C9-12) Alkanes: 2.0% Squalane: 4.0% Paraffin: 25.0% Olive Oil: 3.0% Ester oil 1: 2.0% Dimethicone: 1.0% Caprylic / capric triglyceride: 0.5% Triethylhexanoin: 2.0% Petrolatum: 4.0% Beeswax: 1.0% Tocopherol: 0.02% Phenoxyethanol: 0.1% Disodium edetate: 0.01% Ethylhexylglycerin: 0.2% Water: 39.11%

[0074] [Formulation Example 6] Sunscreen Cream Hydrogenated Polyisobutene: 4.0% Dimethicone: 5.0% Isopropyl Myristate: 2.5% Ester Oil 1: 5.0% Glycerin: 1.0% 1,3-Butylene Glycol: 1.0% Propylene Glycol: 0.5% PEG-75 Stearate: 1.0% Polysorbate 80: 0.5% Behenyl Alcohol: 1.0% Sorbitan Oleate: 1.5% Glyceryl Stearate: 2.0% Xanthan Gum: 0.1% (Acrylates / C10-30 Alkyl Acrylate) Crosspolymer: 0.1% Phenoxyethanol: 0.5% Diethylamino Hydroxybenzoyl Hexyl Benzoate: 1.0% Ethylhexyl Triazine: 1.0% Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine: 0.5% Titanium Dioxide: 4.0% Zinc oxide: 2.0% Phenoxyethanol: 0.2% Water: 65.6%

[0075] The ester oil of the present invention is useful for cosmetics.

[0076] This application is based on Japanese Patent Application No. 2025-053688, which is entirely contained herein.

Claims

1. Cosmetic ester oils containing the following esters A and B, wherein the mass ratio of ester A to ester B is 99.99:0.01 to 95.0:5.0: Ester A: an ester of dodecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms; Ester B: an ester of tridecanoic acid and a saturated monohydric alcohol having 4 to 18 carbon atoms.

2. A cosmetic containing the cosmetic ester oil described in claim 1.

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