JP7838951B2 - Oil-based cleaning agent - Google Patents

Description

This invention relates to an oil-based cleaning agent.

Traditionally, oil-based cleansers used to wash away makeup such as foundation and lipstick have consisted of an oil-based agent that dissolves the components of the makeup and a non-ionic surfactant that washes away the oil-based agent. Among these, liquid oil-based cleansers, such as oil cleansers, are known for their good compatibility with makeup and effective makeup removal after rinsing. However, because these liquid oil-based cleansers contain a large amount of liquid oil, there have been concerns about a greasy feeling during use. Therefore, from the perspective of usability, there has been a desire for the development of an oil-based cleanser that achieves both a non-greasy feel during use and effective makeup removal after use.

To suppress the slipperiness of oily cleansers, technologies using water-soluble components are being investigated. For example, a technology has been disclosed for reducing the emulsion particle size when suspended in a large amount of water in a cleansing oil characterized by containing one or more hydrophilic compounds selected from the group consisting of: a diester of a branched fatty acid with 14 to 22 carbon atoms and polyglycerin; a diester of an unsaturated fatty acid with 14 to 22 carbon atoms and polyglycerin; or both; an ester of a fatty acid with 6 to 10 carbon atoms and polyglycerin, where the ratio of the degree of polymerization of polyglycerin to the number of fatty acid bonds (= degree of polymerization of polyglycerin / number of fatty acid bonds) is 2.0 to 4.0; a diester oil of a dihydric alcohol and a branched fatty acid; a triester oil of glycerin and a branched fatty acid; and a diester oil of a dicarboxylic acid and a branched aliphatic alcohol. (For example, Patent Document 1).

Japanese Patent Publication No. 2018-070481

However, while the technology disclosed in Patent Document 1 excels at removing makeup during rinsing, it is difficult to achieve both effective makeup removal and a non-greasy feel, and the non-greasy feel was sometimes insufficient. Furthermore, because the oily cleanser contains water-soluble components, it was sometimes desirable to further enhance its stability from immediately after manufacturing through the passage of time.

Thus, conventional technology has not been able to produce an oil-based cleanser containing water-soluble components that exhibits excellent stability from immediately after manufacturing through the passage of time, and that satisfies the high demands for usability, such as the absence of a sticky feeling during rinsing and good makeup removal after rinsing.

This invention was made in view of the above circumstances, and aims to provide an oil-based cleansing agent that exhibits excellent stability immediately after manufacturing (stability of fatty acid salts) and stability over time, as well as excellent makeup removal and a non-greasy feel.

The inventors focused on the fact that fatty acid salts used in fatty acid soaps and the like provide a refreshing feeling by generating scum during rinsing, and diligently conducted research to solve the above-mentioned problems. As a result, they found that water-soluble fatty acid salts neutralized with inorganic bases such as sodium hydroxide had poor stability in oily detergents containing a large amount of oily components, resulting in separation and clouding of the oily detergent. On the other hand, organic bases such as triethanolamine were easily incorporated into oily agents, and separation and clouding of the oily detergent were not observed, but odor changes and yellowing over time were sometimes problematic. However, they discovered that by setting the polarity balance of the liquid oils contained in the oily detergent (a value obtained by weighting the individual IOB values of the liquid oils at 25°C based on their content mass ratio) within a specific range, and further combining it with a specific surfactant, it is possible to stably incorporate fatty acid salts neutralized with potassium hydroxide into the oily detergent, resulting in an oily detergent with excellent stability over time, without separation, clouding, or yellowing.

The inventors of the present invention have discovered that by combining isostearic acid and/or oleic acid, potassium hydroxide and/or triethanolamine with a liquid oil at 25°C, a nonionic surfactant with an HLB of 7 to 12 that is also liquid at 25°C, and a small amount of water, and by setting the polarity balance of the liquid oil at 25°C (a value obtained by weighting the individual IOB values of the liquid oil at 25°C based on their mass ratio) within a specific range, an oily cleansing agent can be obtained that exhibits excellent makeup removal, lack of greasiness, and superior stability immediately after manufacturing and over time, thus completing the present invention.

In other words, the present invention provides the following:
[1]
The following components (A) to (E):
(A) Isostearic acid and/or oleic acid (B) Potassium hydroxide and/or triethanolamine (C) Liquid oil at 25°C (D) Water 1-3% by mass
(E) An oily detergent containing a nonionic surfactant that is liquid at 25°C and has an HLB of 7 to 12, wherein the weighted average of the individual IOB values of the contained component (C) based on the mass ratio of the contained components is greater than 0.05 and less than 0.3.
[2]
The oily detergent according to [1], wherein the content of component (A) is 0.5 to 4% by mass in the oily detergent.
[3]
The oily detergent according to [1] or [2], wherein component (E) is polyoxyethylene glyceryl isostearate having an average number of moles of ethylene oxide added of 5 to 15.
[4]
The oily cleaning agent according to any one of [1] to [3] above, wherein component (C) contains at least an ester oil, and the content of the ester oil in component (C) is 50% by mass or more.
[5]
The component (C) is an oily cleaning agent according to any one of [1] to [4] above, which contains an ester oil and a hydrocarbon oil.
[6]
The oily detergent according to [5] above, wherein the mass ratio of ester oil and hydrocarbon oil in component (C) [ester oil/hydrocarbon oil] is 1.0 to 5.0.
[7]
The oily detergent described in any one of the preceding [1] to [6], wherein the mass ratio of component (B) and component (C) [(C)/(B)] is 80 to 800.
[8]
Next steps (1) to (3);
The method for producing an oily detergent is characterized by comprising the steps of (1) mixing component (A) isostearic acid and/or oleic acid, component (C) an oil that is liquid at 25°C, and component (E) a nonionic surfactant that is liquid at 25°C and has an HLB of 7 to 12; (2) dissolving component (B) potassium hydroxide and/or triethanolamine in component (D) water at a neutralization rate of 50 to 150% of component (A) isostearic acid and/or oleic acid; and (3) mixing (1) and (2).

Furthermore, this technology can also incorporate the following additional configurations.
[9]
The component (C) is an oily cleaning agent according to any one of [1] to [7] above, which does not contain volatile silicone oil.
[10]
The component (C) is an oily cleaning agent according to any one of [1] to [7] or [9], comprising an ester oil and a hydrocarbon oil.

The oil-based cleansing agent of the present invention can stably contain fatty acid salts and exhibits excellent long-term stability. Furthermore, the oil-based cleansing agent of the present invention also excels in makeup removal and non-greasy residue.

The embodiments of the present invention will be described below. However, the present invention is not limited to the embodiments described below. In this specification, the range "X to Y" includes X and Y, meaning "X or greater and Y or less."

(Component (A): Isostearic acid and/or oleic acid)

The component (A) isostearic acid and/or oleic acid used in this invention is a higher fatty acid that is liquid at room temperature and is not particularly limited as long as it is commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc. In this invention, potassium hydroxide and/or triethanolamine are used to form a fatty acid soap. Examples of commercially available products include Isostearic Acid EX (manufactured by Higher Alcohol Industry Co., Ltd.) and NAA-400 Oleic Acid (manufactured by NOF Corporation).

The content of component (A) in this invention is not particularly limited, but from the viewpoint of long-term stability and good makeup removal, it is preferably 0.5 to 4% by mass (hereinafter simply referred to as "%") in the oily cleanser, and more preferably 1 to 3%.

(Component (B): Potassium hydroxide and/or triethanolamine)

The component (B) potassium hydroxide and/or triethanolamine used in this invention is not particularly limited as long as it is commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc. Using potassium hydroxide and/or triethanolamine yields an oily cleansing agent that is difficult to obtain with other alkaline agents such as sodium hydroxide, exhibiting excellent stability immediately after manufacturing, good makeup removal, and good usability, such as a non-greasy feel. In this invention, while separation and clouding of the oily cleansing agent are not observed when triethanolamine is used as component (B), yellowing over time may occur. Therefore, from the viewpoint of superior formulation stability (stability over time) of the oily cleansing agent, potassium hydroxide is preferred.

The content of component (B) in this invention is not particularly limited, but it is preferably 50-150% of the neutralization rate of component (A), and more preferably 75-125%.

(Component (C): Liquid oil at 25°C)

The component (C) used in this invention, which is a liquid oil at 25°C (hereinafter also referred to as "liquid oil"), means an oil that has fluidity at 25°C and is not particularly limited as long as it is commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc. For example, regardless of whether it is volatile or non-volatile, or of origin such as animal oil, vegetable oil, or synthetic oil, examples include hydrocarbons, fats and oils, ester oils including UV absorbers, fatty acids other than component (A), higher alcohols, silicone oils, fluorinated oils, lanolin derivatives, etc., but are not limited to these. One or more of these can be appropriately selected and used.

The aforementioned component (C), as a liquid oil at 25°C, specifically includes vegetable oils such as olive oil, castor oil, mink oil, macadamia nut oil, avocado oil, and meadowfoam oil; jojoba oil, diisobutyl adipate, 2-hexyldecyl adipate, di-2-heptylundecyl adipate, alkyl glycol monoisostearate, isocetyl isostearate, trimethylolpropane triisostearate, ethylene glycol di-2-ethylhexanoate, neopentyl glycol di-2-ethylhexanoate, trimethylolpropane tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, cetyl 2-ethylhexanoate, oleyl oleate, octyldodecyl oleate, and decyl oleate. Neopentyl glycol dicaprate, triethyl citrate, 2-ethylhexyl succinate, isocetyl stearate, butyl stearate, diisopropyl sebacate, di-2-ethylhexyl sebacate, cetyl lactate, myristyl lactate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecyl palmitate, dipentaerythritol fatty acid ester, isononyl isononanoate, isotridecyl isononanoate, isopropyl myristate, isopropyl palmitate, 2-octyldodecyl myristate, 2-hexyldecyl myristate, myristyl myristate, hexyldecyl dimethyloctanoate, ethyl laurate, hexyl laurate, methoxy Ester oils such as 2-ethylhexyl cinnamate, diisostearyl malate, glyceryl tri-2-ethylhexanoate, glyceryl tri(caprylate/caprine), glyceryl tricaprate, glyceryl triisostearate, diglyceryl diisostearate, diglyceryl triisostearate, diglyceryl tetraisostearate, decaglyceryl decaisostearate, glyceryl triisopalmitate, glyceryl trimiristate, diglyceryl isostearate myristate, tridecyl trimellitate, N-lauroyl-L-glutamate-2-octyldodecyl ester, N-lauroyl-L-glutamate di(phytostearyl/2-octyldodecyl); low-molecular-weight dimethylpolysiloxane, high-molecular-weight di Examples of oils include silicone oils such as methylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, and fluorine-modified organopolysiloxane; fluorine-based oils such as perfluorodecane, perfluorooctane, and perfluoropolyether; hydrocarbon oils such as isododecane, isohexadecane, light liquid isoparaffin, liquid paraffin, heavy liquid isoparaffin, α-olefin oligomer, squalane, polyisobutylene, and polybutene; higher alcohols such as oleyl alcohol, isostearyl alcohol, octyldodecanol, and decyltetradecanol; and lanolin derivatives such as lanolin acetate, isopropyl lanolin fatty acid, and lanolin alcohol. One or more of these can be appropriately selected and used.

In this invention, component (C), a liquid oil at 25°C, is preferably one or more selected from the group consisting of ester oils, hydrocarbon oils, and silicone oils. From the viewpoint of long-term stability and good makeup removal, it is more preferable to contain at least an ester oil, and even more preferable to contain both an ester oil and a hydrocarbon oil.

For component (C), a liquid oil at 25°C, an IOB value of 0 to 0.5 is preferable from the viewpoint of usability, including long-term stability, good makeup removal, and lack of greasiness. A value of 0 to 0.4 is more preferable from the viewpoint of lack of greasiness.

The ester oil of component (C) is preferably of an IOB value of 0.05 to 0.5, and more preferably of 0.1 to 0.4. Examples of these ester oils include propylene glycol dicaprate (IOB value: 0.26), isotridecyl isononanoate (IOB value: 0.16), cetyl 2-ethylhexanoate (IOB value: 0.13), alkyl (C12-15) benzoate (IOB value: 0.19), jojoba oil (IOB value: 0.07), glyceryl tri-2-ethylhexanoate (IOB value: 0.35), neopentyl glycol dicaprate (IOB value: 0.25), neopentyl glycol diethylhexanoate (IOB value: 0.32), trimethylolpropane triethylhexanoate (IOB value: 0.33), pentaerythrityl tetraoctanoate (IOB value: 0.35), caprylic/capric triglyceride (IOB value: 0.35), palm oil. Examples include octyl tinate (IOB value: 0.13), cetyl octanoate (IOB value: 0.13), isopropyl myristate (IOB value: 0.18), glyceryl triisostearate (IOB value: 0.18), trimethylolpropane triisostearate (IOB value: 0.20), isononyl isononanoate (IOB value: 0.20), diisostearyl malate (IOB value: 0.27), glyceryl diisostearate (IOB value: 0.29), trimethylolpropane trioctanoate (IOB value: 0.31), di-2-ethylhexyl succinate (IOB value: 0.32), tetra(behenic acid/benzoic acid/ethylhexanoic acid) pentaerythritol (IOB value: 0.35), and diisopropyl sebacate (IOB value: 0.40).

Furthermore, the ester oil of component (C) is preferably 500 or less in molecular weight, and more preferably 200 to 500 in molecular weight from the viewpoint of usability, such as good makeup removal and lack of greasiness. Examples of ester oils with a molecular weight of 500 or less include propylene glycol dicaprate, cetyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, isopropyl myristate, caprylic/capric triglyceride, cetyl octanoate, and isotridecyl isononanoate. In the present invention, it is particularly preferable to use one or more selected from propylene glycol dicaprate, cetyl 2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, isopropyl myristate, and caprylic/capric triglyceride, as this results in superior stability over time and even better usability, such as good makeup removal and lack of greasiness.

Furthermore, the hydrocarbon oil of component (C) preferably has an IOB value of 0. Examples of such hydrocarbon oils include isododecane (IOB value: 0), isohexadecane (IOB value: 0), mineral oil (IOB value: 0), hydrogenated polyisobutene (IOB value: 0), and squalane (IOB value: 0). Mineral oil and/or hydrogenated polyisobutene are particularly preferred because they offer superior stability over time, and further improve usability, such as better makeup removal and a lack of stickiness.

The silicone oil of component (C) of the present invention preferably has an IOB value of 0.15 to 0.5.

Here, the IOB value is explained below. The IOB value is a value determined based on the Organic Concept Diagram (Takashi Fujita, Prediction of Organic Compounds and the Organic Concept Diagram, Chemistry Vol. 11, No. 10 (1957) 719-715). More specifically, in this Organic Concept Diagram, the physicochemical properties of a compound are expressed by defining the degree of properties mainly due to van der Waals forces as "organic" and the degree of properties mainly due to electrical affinity as "inorganic." The IOB value is an index that shows the balance between inorganic and organic properties, and is expressed as IOB value = inorganic value / organic value. Compounds with a larger IOB value are said to exhibit higher hydrophilicity and polarity.

The content of component (C) in this invention is not particularly limited, but it is preferably 50-95%, more preferably 60-90%, and even more preferably 60-80% in the oily cleanser. This range is preferable because it improves long-term stability, as well as usability, such as better makeup removal and a lack of stickiness.

The ester oil content of component (C) is not particularly limited, but is preferably 30-80%, more preferably 40-80%, and even more preferably 40-70% of the oily cleanser. Furthermore, the ester oil content relative to the total amount of component (C) is not particularly limited, but is preferably 40-100%, more preferably 50-90%, and even more preferably 50-80%. This range is preferable because it improves long-term stability and makeup removal performance.

The hydrocarbon oil content of component (C) is not particularly limited, but is preferably 5-50%, more preferably 10-40%, and even more preferably 15-30% in the oily cleanser. Furthermore, the hydrocarbon oil content relative to the total amount of component (C) is not particularly limited, but is preferably 10-50%, more preferably 20-50%, and even more preferably 20-45%. This range is preferable because it improves long-term stability and makeup removal performance.

The content of silicone oil in component (C) is not particularly limited, but it is preferably 1 to 15%, more preferably 1 to 10%, and even more preferably 1 to 7% in the oily cleanser. This range is preferable because it results in better makeup removal.

Furthermore, while component (C) of the present invention may contain silicone oil, it is more preferable that component (C) does not contain volatile silicone oil from the viewpoint of long-term stability and lack of stickiness, and even more preferable that component (C) consists of hydrocarbon oil and ester oil. Here, volatile silicone refers to a substance with a boiling point of 300°C or less at 1 atmosphere, and specifically, examples include volatile dimethicone, methyl trimethicone, and cyclic silicone (such as cyclic dimethylsiloxane).

Furthermore, in this invention, the mass ratio of ester oil and hydrocarbon oil in component (C) [ester oil/hydrocarbon oil] is not particularly limited, but is preferably 1.0 to 5.0, more preferably 1.0 to 4.0, even more preferably 1.4 to 3.9, and particularly preferably 1.4 to 3.7. This range is preferable because it improves long-term stability, as well as usability such as good makeup removal and lack of stickiness.

In this invention, the polarity balance of the liquid oil is important from the viewpoint of stably containing fatty acid salts in the oily detergent. The polarity balance can be adjusted using a polar oil alone or a combination of a polar oil and a non-polar oil. A combination of a polar oil and a non-polar oil is preferred, and it is more preferable to use an ester oil as the polar oil and a hydrocarbon oil as the non-polar oil.

As described above, in the present invention, in order to stably contain fatty acid salts in the oily detergent and to maintain the stability of the oily detergent over time, the polarity balance of the liquid oils {a value obtained by weighting the individual IOB values of the contained component (C) based on the content mass ratio (hereinafter simply referred to as "weighted average of the IOB values of component (C)")} is important. In the present invention, the weighted average of the IOB values of component (C) is calculated by dividing the sum of the products of the content of each oil corresponding to component (C) and the IOB value of each oil by the sum of the content of each oil (a value represented by the following formula (1)).

Weighted average of IOB values of component (C) = [(C1: Content (%) × IOB value) + (C2: Content (%) × IOB value) + (C3: Content (%) × IOB value) + ... / (C1 + C2 + C3 + ...: Content (%))] ... (Equation 1)

In this invention, the weighted average IOB value of component (C) is preferably greater than 0.05 as a lower limit from the viewpoint of stability immediately after manufacturing and stability over time, and preferably 0.10 or higher, and more preferably 0.15 or higher, from the viewpoint of stability over time and good makeup removal. Furthermore, the upper limit is preferably less than 0.3, preferably 0.28 or lower, more preferably 0.26 or lower from the viewpoint of lack of greasiness, and even more preferably 0.20 or lower from the viewpoint of stability over time and good makeup removal. Also, if the weighted average IOB value of component (C) is 0.05 or lower, or 0.3 or higher, the polarity balance between the oil and fatty acid salt in the oily cleanser is disrupted, making it difficult to stably contain the fatty acid salt in the oily cleanser, and resulting in insufficient stability over time.

Furthermore, in this invention, although components (A) to (E) can be obtained by appropriately including them, specifying the mass ratio of components (B) and (C) is preferable because it can be expected to have a higher effect in terms of long-term stability and ease of makeup removal. While the mass ratio of components (B) and (C) [(C)/(B)] is not particularly limited, it is preferably 40 or more, more preferably 80 or more, and even more preferably 100 or more as a lower limit. The upper limit is preferably 1000 or less, more preferably 800 or less, even more preferably 700 or less, and particularly preferably 500 or less.

(Component (D): water)

The component (D) water used in this invention is not particularly limited, as long as it is commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc. In addition to purified water, deep-sea water or steam-distilled water from plants such as rose water or lavender water may also be used, as long as the effects of this invention are not impaired. One or more types may be appropriately selected and used as needed.

Furthermore, the content of component (D) in this invention is 1 to 3% in the oily detergent, and more preferably 1.5 to 3% from the viewpoint of long-term stability, etc. If it is less than 1% or more than 3%, separation tends to occur in the oily detergent, resulting in insufficient stability.

(Component (E): A nonionic surfactant that is liquid at 25°C and has an HLB of 7-12)

The component (E) used in this invention, having an HLB of 7 to 12 and being a liquid nonionic surfactant at 25°C, is not particularly limited as long as it is commonly used in cosmetics, quasi-drugs, pharmaceuticals, etc.

Here, HLB (Hydrophile-Lipophile Balance) in this invention is an index that indicates the balance between hydrophilicity and lipophilicity, and is calculated by the following formula (Equation 2) by Oda, Teramura, et al.
HLB = "Inorganic value (IV) / Organic value (OV)" × 10 ... (Equation 2)
(See Yoshio Koda, "Organic Concept Diagrams - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984.)

The component (E) of the present invention, a nonionic surfactant that is liquid at 25°C and has an HLB of 7 to 12, is fluid at 25°C. Any nonionic surfactant with an HLB value in the range of 7 to 12 can be used. Examples include sorbitan fatty acid esters, polyglycerin fatty acid esters, sucrose fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid ethanolamide, polyoxyalkylene-modified silicones, and polyoxyalkylene alkyl-comodified silicones. One or more of these can be appropriately selected and used.

In this invention, the liquid nonionic surfactant, component (E) with an HLB of 7 to 12, is preferably a polyoxyethylene chain, and more preferably is polyoxyethylene glyceryl isostearate with an average number of ethylene oxide additions of 5 to 15, from the viewpoint of being able to stably contain fatty acid salts in oily cleansing agents and also having excellent long-term stability. Examples of polyoxyethylene glyceryl isostearate with an average number of ethylene oxide additions of 5 to 15 include PEG-5 glyceryl isostearate, PEG-8 glyceryl isostearate, PEG-10 glyceryl isostearate, and PEG-15 glyceryl isostearate, and one or more of these can be used. Among these, PEG-8 glyceryl isostearate with an average number of ethylene oxide additions of 8 is preferred from the viewpoint of stability immediately after manufacturing, long-term stability, and ease of use such as makeup removal.

Examples of commercially available polyoxyethylene glyceryl isostearate products with an average number of ethylene oxide additions of 5 to 15 include Uniox GM-5IS (manufactured by NOF Corporation), EMALEX GWIS-105EX (manufactured by Nippon Emulsion Co., Ltd.), Uniox GM-8IS (manufactured by NOF Corporation), EMALEX GWIS-108 (manufactured by Nippon Emulsion Co., Ltd.), M Fine Oil ISG-8M (manufactured by Miyoshi Oil & Fat Co., Ltd.), Uniox GM-101S (manufactured by NOF Corporation), EMALEX GWIS-110EX (manufactured by Nippon Emulsion Co., Ltd.), Uniox GM-15IS (manufactured by NOF Corporation), EMALEX GWIS-115EX (manufactured by Nippon Emulsion Co., Ltd.), and others.

The content of component (E) in this invention is not particularly limited, but from the viewpoint of usability such as long-term stability, good makeup removal, and lack of stickiness, it is preferably 5 to 40%, more preferably 10 to 30%, and even more preferably 15 to 30% in the oily cleanser.

In this invention, while components (A) to (E) can be obtained by appropriately including them, specifying the mass ratio of components (B) and (E) is preferable because it can be expected to have a higher effect in terms of long-term stability, ease of makeup removal, and lack of stickiness. The mass ratio of components (B) and (E) [(E)/(B)] is not particularly limited, but the lower limit is preferably 10 or more, more preferably 30 or more, and even more preferably 40 or more. The upper limit is preferably 500 or less, more preferably 300 or less, and even more preferably 250 or less.

The oily cleansing composition of the present invention may contain, in addition to the essential components described above, other components commonly used in cosmetics, as necessary, within a quantitative and qualitative range that does not impair the effects of the present invention. For example, it may contain oily components other than component (C), surfactants other than component (E), powders, water-soluble polymers, aqueous components such as humectants, antioxidants, cosmetic ingredients, preservatives, fragrances, cooling agents, etc.

The aqueous component can be any component that is soluble in water. Examples include glycols such as propylene glycol, 1,3-butylene glycol, dipropylene glycol, and polyethylene glycol; glycerols such as glycerin, diglycerin, and polyglycerin; sugar alcohols such as sorbitol, maltitol, and glucose; and lower alcohols such as ethanol.

The oily detergent of the present invention can be implemented in various forms, including liquid, gel, emulsion, cream, semi-solid, solid, and mousse. Among these, a liquid form is preferable for obtaining the effects of the present invention. Here, "liquid" refers to a viscosity measured at 25°C using a Brookfield rotational viscometer of 15,000 mPa·s or less, preferably 10,000 mPa·s or less, more preferably 7,000 mPa·s or less, and even more preferably 5,000 mPa·s or less. Furthermore, the dosage form of the oily detergent of the present invention is preferably either an oily type or a solubilized type, and from the viewpoint of stability immediately after formulation and stability over time, the solubilized type is more preferable.

The oil-based cleansing agent of the present invention can be applied to cleansing agents, facial washes, shampoos, body soaps, hand soaps, massage agents, peeling agents, and the like. From the viewpoint of experiencing the effects of the present invention, cleansing agents and facial washes are preferred.

(Manufacturing method)
The oily cleaning agent of the present invention is not particularly limited and can be prepared by conventional methods. For example, it can be prepared by uniformly mixing and dissolving components (A), (C), (E) and components (B), (D), and then mixing the two together.

Examples 1-19 and Comparative Examples 1-8: Oily Cleansing Agents Oily cleansing agents with the compositions shown in Tables 1 and 2 below were prepared by the manufacturing method described below. The stability immediately after formulation (stability of fatty acid salts), stability over time (50°C and 5°C/2 weeks), lack of stickiness, and makeup removal performance were evaluated using the evaluation method and criteria described below, and the results are shown together in Tables 1 and 2.

*Note: Yellowing was observed during long-term stability testing (50°C/2 weeks).
(Note 1) Isostearate EX (manufactured by Higher Alcohol Industry Co., Ltd.)
(Note 2) NAA-400 oleic acid (manufactured by NOF Corporation)
(Note 3) Flake potassium hydroxide (manufactured by Toagosei Co., Ltd.)
(Note 4) CETIO SN-1 (manufactured by BASF)
(Note 5) MIRITOL GTEH (manufactured by BASF)
(Note 6) Cosmoll 222 (manufactured by Nisshin Oillio Co., Ltd.)
(Note 7) Moresco White P-70K (manufactured by Moresco)
(Note 8) SH245 FLUID (Toray Dow Corning)
(Note 9) M Fine Oil CCT-1 (manufactured by Miyoshi Oil Co., Ltd.)
(Note 10) M Fine Oil ISG-8M (manufactured by Miyoshi Oil & Fat Co., Ltd.)

(Manufacturing method)
A: Mix ingredients 1, 2, and 7-15 uniformly.
B: Mix ingredients 3-6 uniformly.
C: An oily cleaning agent was obtained by mixing A and B.

[Evaluation Method 1] Stability immediately after manufacturing

The stability of fatty acid salts in oil-based detergents can be confirmed by their stability immediately after manufacturing. Here, immediate stability was assessed by visually observing each sample immediately after manufacturing to determine if separation and/or turbidity were observed.

[Judgment]: [Evaluation]
○ (Excellent): No separation or turbidity observed. × (Unacceptable): Separation and/or turbidity observed. Note that oil-based detergents in which phase separation or precipitation of contents was observed were classified as separation and turbidity, respectively.

[Evaluation Method 2] Stability over time (50°C and 5°C / 2 weeks)
For long-term stability, each sample was placed in a glass container, sealed, and stored for two weeks at constant temperatures of 50°C and 5°C, respectively. After visual inspection, the separation and turbidity were evaluated according to the following three-stage criteria, and compared with samples stored at 25°C for the same period.

Three-stage evaluation criteria: [Evaluation] : [Rating]
◎ (Excellent): No separation or turbidity observed ○ (Good): Slight separation and/or turbidity observed × (Unacceptable): Separation and/or turbidity observed

[Evaluation Method 3] Lack of stickiness and ease of makeup removal Twenty cosmetic evaluation panel members were asked to use a water-in-oil liquid foundation prepared using the following formulation and manufacturing method. One hour after application, each sample was used to evaluate the "lack of stickiness" upon rinsing and the "ease of makeup removal" after rinsing, using a 5-point scale according to the evaluation criteria below. The average score of all panel members was then used to determine the evaluation criteria below. Samples for which evaluation of lack of stickiness and ease of makeup removal was difficult due to reduced stability were judged as "-".

Formula (ingredients) (%) of water-in-oil liquid foundation (suitable for cleansing)
1. Polyoxyethylene methylsiloxane/polyoxypropylene oleylmethylsiloxane/dimethylsiloxane copolymer (Note 11) 2
2. PEG-3 Dimethicone (Note 12) 1
3. Decamethylcyclopentasiloxane 20
4. Silicone-treated talc (Note 13) 5
5. Silicone-treated red iron oxide (Note 13) 0.5
6. Silicone-treated yellow iron oxide (Note 13) 0.5
7. Silicone-treated black iron oxide (Note 13) 0.5
8. Silicone-treated titanium oxide (Note 13) 10
9. Glyceryl tri-2-ethylhexanoate 10
10. Sorbitan sesquioleate 0.5
11. Purified water remaining amount 12. Sodium chloride 0.5
13. 1,3-Butylene glycol 10
14. Alcohol 5
15. Preservative (methyl parahydroxybenzoate) 0.1
16. Fragrance 0.2
(Note 11) KF-6026 (manufactured by Shin-Etsu Chemical Co., Ltd.)
(Note 12) KF-6015 (manufactured by Shin-Etsu Chemical Co., Ltd.)
(Note 13) Treatment with 2% dimethylpolysiloxane

Method for manufacturing a water-in-oil liquid foundation (for cleansing) A: Mix ingredients 1 to 3 uniformly.
B: Disperse components 4-10 uniformly using a roller.
C: Add B to A and mix thoroughly.
Ingredients 11-16 were added to D:C and emulsified to obtain a water-in-oil liquid foundation.

Five-point rating scale [Rating]: [Evaluation result]
5 points: Excellent 4 points: Good 3 points: Average 2 points: Slightly Poor 1 point: Poor 3-level rating system [Rating]: [Average score]
◎ (Excellent): 4.0 or higher
○ (Good): Greater than 3.0 and less than 4.0 × (Unacceptable): 3.0 or less

As is clear from the results in Tables 1 and 2, the oily cleansing agents of Examples 1 to 19 of the present invention were superior to the oily cleansing agents of Comparative Examples 1 to 8 in terms of stability immediately after manufacturing, stability over time, lack of stickiness, and makeup removal performance. Furthermore, in Example 19, where triethanolamine, an organic base, was used instead of component (B), no separation or clouding of the oily cleansing agent was observed from immediately after manufacturing to over time, indicating good stability; however, yellowing at high temperatures was observed.

In contrast, Comparative Examples 1-3, 5, and 6, where the weighted average of the individual IOB values of component (C) obtained by weighting them based on their mass ratio (weighted average of IOB values of component (C)) was 0.3 or higher and 0.05 or lower, found it difficult to stably incorporate fatty acid salts into the oily detergent, and satisfactory stability over time was not achieved. Furthermore, in Comparative Example 4, where sodium hydroxide was used instead of component (B), the fatty acid salts neutralized by sodium hydroxide precipitated, resulting in separation and turbidity of the oily detergent immediately after production, and unsatisfactory results were not obtained. Additionally, in Comparative Examples 7 and 8, where component (D) was less than 1% or more than 3%, unsatisfactory stability immediately after production and stability over time were not achieved.

Example 20: Cleansing Oil (Ingredients) (Mass %)
1. Purified water 1.5
2. Glycerin 0.3
3. Potassium hydroxide (Note 3) 0.2
4. Triethanolamine 0.1
5. Isostearic acid (Note 1) 1.0
6.2-Cetyl ethylhexanoate (IOB value: 0.13) (Note 4) 25
7. Glyceryl tri-2-ethylhexanoate (IOB value: 0.35) (Note 5) Remaining amount 8. Mineral oil (IOB value: 0) (Note 7) 20
9. Isopropyl myristate (IOB value: 0.18) (Note 14) 3.0
10. Propylene glycol dicaprate (IOB: 0.26) (Note 15) 1.0
11. Jojoba oil (IOB value: 0.07) (Note 16) 1.0
12. PEG-8 glyceryl isostearate (Note 10) 25
13. BHT 0.02
14. Phenoxyethanol 0.05
15. Fragrance 0.01
16. Ethanol 1.0
(Note 14) IPM-EX (manufactured by Japan Surfactant Industry Co., Ltd.)
(Note 15) Nikkor PDD (manufactured by Japan Surfactant Industry Co., Ltd.)
(Note 16) Refined jojoba oil (manufactured by Higher Alcohol Industry Co., Ltd.)

(Manufacturing method)
A: Mix components 1-4 and components 5-14 uniformly and dissolve them, then mix the two together.
B: Components 15 and 16 were uniformly mixed and added to A to obtain an oily cleaning agent.

The cleansing oil of Example 20 exhibited good stability immediately after manufacturing, stability over time, effective makeup removal, and a non-greasy feel. The weighted average of the individual IOB values of component (C) based on their mass ratio was 0.16.

Example 21: Facial Cleanser (Ingredients) (Mass %)
1. Purified water 1.5
2.1,3-Butylene glycol 0.3
3. Dipropylene glycol 0.2
4. Potassium hydroxide (Note 3) 0.6
5. Isostearic acid (Note 1) 3.0
6.2-Cetyl ethylhexanoate (IOB value: 0.13) (Note 4) 30
7. Glyceryl tri-2-ethylhexanoate (IOB value: 0.35) (Note 5) Remaining amount 8. Mineral oil (IOB value: 0) (Note 7) 15
9. Jojoba oil (IOB value: 0.07) (Note 16) 3.0
10. PEG-8 glyceryl isostearate (Note 10) 25
11. Tocopherol 0.02
12. Phenoxyethanol 0.05
13. Fragrance 0.03
14. Ethanol 1.0

(Manufacturing method)
A: Mix components 1-4 and components 5-12 uniformly and dissolve them, then mix the two together.
B: Components 13 and 14 were uniformly mixed and added to A to obtain an oily cleaning agent.

The cleansing agent of Example 21 exhibited good stability immediately after manufacturing, stability over time, effective makeup removal, and lack of stickiness. The weighted average of the individual IOB values of the contained component (C) based on their mass ratio was 0.16.

Claims (9)

The following components (A) to (E):
(A) Isostearic acid and/or oleic acid (B) Potassium hydroxide and/or triethanolamine (C) Liquid oil at 25°C (D) Water 1-3% by mass
(E) Contains a nonionic surfactant that is liquid at 25°C and has an HLB of 7 to 12, and the weighted average of the individual IOB values of the contained component (C) based on the mass ratio of the contained components is greater than 0.05 and less than 0.3, and
An oily detergent in which component (E) is polyoxyethylene glyceryl isostearate having an average number of moles of ethylene oxide added of 5 to 15 . The oil-based cleaning agent according to claim 1, wherein the content of component (A) is 0.5 to 4% by mass in the oil-based cleaning agent. The oily cleaning agent according to claim 1 or 2 , wherein component (C) contains at least an ester oil, and the content of the ester oil in component (C) is 50% by mass or more. The oily cleaning agent according to any one of claims 1 to 3 , wherein the component (C) contains an ester oil and a hydrocarbon oil. The oily detergent according to claim 4 , wherein the mass ratio of ester oil and hydrocarbon oil in component (C) [ester oil/hydrocarbon oil] is 1.0 to 5.0. The oily detergent according to any one of claims 1 to 5 , wherein the mass ratio of component (B) and component (C) [(C)/(B)] is 80 to 800. The following components (A) to (E):
(A) Isostearic acid and/or oleic acid
(B) Potassium hydroxide
(C) Liquid oil at 25°C
(D) Water 1-3% by mass
(E) Nonionic surfactants that are liquid at 25°C and have an HLB of 7 to 12
An oily detergent containing (C), wherein the weighted average of the individual IOB values of the contained component (C) based on their mass ratio is greater than 0.05 and less than 0.3. Next steps (1) to (3);
(1) A step of mixing component (A) isostearic acid and/or oleic acid, component (C) an oil that is liquid at 25°C, and component (E) a nonionic surfactant that is liquid at 25°C and has an HLB of 7 to 12; (2) A step of dissolving component (B) potassium hydroxide and/or triethanolamine in component (D) water at a neutralization rate of 50 to 150% of component (A) isostearic acid and/or oleic acid; (3) A step of mixing (1) and (2) .
The weighted average of the individual IOB values of component (C) based on their content mass ratio is greater than 0.05 and less than 0.3, and
A method for producing an oily detergent , wherein the component (E) is polyoxyethylene glyceryl isostearate having an average number of ethylene oxide addition moles of 5 to 15 . Next steps (1) to (3);
(1) A step of mixing component (A) isostearic acid and/or oleic acid, component (C) an oil that is liquid at 25°C, and component (E) a nonionic surfactant that is liquid at 25°C and has an HLB of 7 to 12.
(2) A step of dissolving component (B) potassium hydroxide in component (D) water, in an amount equal to 50-150% of the neutralization rate of component (A) isostearic acid and/or oleic acid.
(3) The process of mixing (1) and (2)
Includes,
A method for producing an oily detergent, wherein the weighted average of the individual IOB values of component (C) based on their content mass ratio is greater than 0.05 and less than 0.3.