JP7793499B2 - Oil-based cosmetics - Google Patents

Description

The present invention relates to oil-based cosmetics.

Oil-based cleansing cosmetics have traditionally been widely used as oil-based cosmetics for removing makeup stains because of their excellent cleansing effect (i.e., makeup removal effect). Attempts have been made to improve the cleansing power and usability of oil-based cleansing cosmetics (e.g., Patent Document 1).

On the other hand, makeup cosmetics such as mascara have been improved to improve their water resistance in order to prevent them from smudging. As a result, they have become more difficult to remove. Therefore, to remove makeup cosmetics that are applied locally, such as mascara, it is common to use oil-based cleansing cosmetics (mascara remover, eye makeup remover, lip remover, etc.) for point makeup (mascara, eyeliner, eyeshadow, lipstick, etc.) in addition to oil-based cleansing cosmetics that target the entire makeup area (entire face).

Japanese Patent Application Laid-Open No. 2020-66623

In addition to excellent cleansing power, these oil-based cleansing cosmetics for point makeup are required to have a viscosity that prevents dripping when applied to each makeup area. One possible way to impart viscosity to oil-based cleansing cosmetics is to incorporate a highly viscous oil or thickener.

However, in conventional oil-based cleansing cosmetics, it has been difficult to adjust the viscosity to the desired level by incorporating highly viscous oils or thickeners. Another possible method for improving viscosity is to increase the amount of surfactant contained in the oil-based cleansing cosmetic. However, increasing the amount of surfactant presents the problem of reduced storage stability of the oil-based cleansing cosmetic.

Therefore, an object of the present invention is to provide an oil-based cosmetic preparation whose viscosity is easy to adjust and which has excellent storage stability.

As a result of extensive research into achieving the above-mentioned objectives, the inventors discovered that by using a combination of a specific ester oil, a specific nonionic surfactant, and a polyhydric alcohol, it is possible to obtain an oil-based cosmetic preparation whose viscosity is easy to adjust and which has excellent storage stability. The present invention was completed based on these findings.

That is, the present invention comprises the following component A, the following component B, and the following component C:
the mass ratio [B3/B1] of the content of component B3 to the content of component B1 is 2.0 to 10.0;
The oil-based cosmetic is provided, in which the total content of components B1, B2, and B3 is 20.0 to 50.0% by mass.
Component A: Ester oil containing the following Component A1 and Component A2: Component A1: Ester of a monovalent higher fatty acid and a monovalent to trivalent alcohol
Component A2: an ester of a fatty acid having 8 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, wherein the number of bonds of the fatty acid is 7 to 15. Component B: a nonionic surfactant comprising the following components B1, B2, and B3. Component B1: an ester of a fatty acid having 8 to 14 carbon atoms and a polyglycerol having an average degree of polymerization of 3 to 10, wherein the number of bonds of the fatty acid is 1 to 5. Component B2: an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, wherein the number of bonds of the fatty acid is 4 to 6. Component B3: an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, wherein the number of bonds of the fatty acid is 1 to 3. Component C: a polyhydric alcohol

The oil-based cosmetic preferably further contains the following component D.
Component D: higher alcohol

The content of component B2 is preferably 0.5 to 5.0 mass%.

The oil-based cosmetic of the present invention has easy-to-adjust viscosity and excellent storage stability. Therefore, it is possible to provide an oil-based cosmetic that has excellent storage stability while having an appropriate viscosity depending on the application site and other usage conditions.

The oil-based cosmetic of the present invention comprises an ester oil containing an ester of a monovalent higher fatty acid with a mono- to trivalent alcohol and an ester of a fatty acid having 8 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, wherein the number of bonds between the fatty acids is 7 to 15. In this specification, the ester of a monovalent higher fatty acid with a mono- to trivalent alcohol may be referred to as "component A1," and the ester of a fatty acid having 8 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, wherein the number of bonds between the fatty acids is 7 to 15, may be referred to as "component A2." The ester oil containing components A1 and A2 may be referred to as "component A."

The oil-based cosmetic of the present invention also contains nonionic surfactants including an ester of a fatty acid having 8 to 14 carbon atoms and a polyglycerol having an average degree of polymerization of 3 to 10, where the number of fatty acid bonds is 1 to 5; an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, where the number of fatty acid bonds is 4 to 6; and an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, where the number of fatty acid bonds is 1 to 3. In this specification, an ester of a fatty acid having 8 to 14 carbon atoms and a polyglycerol having an average degree of polymerization of 3 to 10, in which the number of bonded fatty acids is 1 to 5, may be referred to as "component B1," an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, in which the number of bonded fatty acids is 4 to 6, may be referred to as "component B2," and an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, in which the number of bonded fatty acids is 1 to 3, may be referred to as "component B3." The nonionic surfactant containing components B1, B2, and B3 may be referred to as "component B."

The oil-based cosmetic preparation of the present invention also contains a polyhydric alcohol. In this specification, the polyhydric alcohol may also be referred to as "Component C."

The oil-based cosmetic preparation of the present invention may further contain a higher alcohol. In this specification, the higher alcohol may also be referred to as "component D."

That is, the oil-based cosmetic of the present invention contains at least component A, which includes component A1 and component A2; component B, which includes component B1, component B2, and component B3; and component C. The oil-based cosmetic of the present invention may further contain component D. The oil-based cosmetic of the present invention may also contain components other than the above-mentioned components A to D. Furthermore, each of the components contained in the oil-based cosmetic of the present invention, for example, component A, component B, component C, component D, and other components, may be used singly or in combination of two or more.

[Component A]
Component A is an ester oil containing component A1 (an ester of a monovalent higher fatty acid and a mono- to trivalent alcohol) and component A2 (an ester of a fatty acid having 8 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, the number of bonds of which is 7 to 15). Only one type of component A1 and two or more types of component A2 may be used.

(Component A1)
Component A1 is an ester of a monohydric higher fatty acid and a monohydric to trihydric alcohol.

The monovalent higher fatty acid that constitutes component A1 is not particularly limited, but is preferably a saturated or unsaturated fatty acid with 6 or more carbon atoms. The number of carbon atoms in the fatty acid is preferably 8 or more, more preferably 12 or more. The number of carbon atoms in the fatty acid is also preferably 22 or less, more preferably 18 or less, and even more preferably 16 or less.

Examples of the above-mentioned higher fatty acids include saturated fatty acids such as 2-ethylhexanoic acid (C8), caprylic acid (C8), capric acid (C10), lauric acid (C12), myristic acid (C14), palmitic acid (C16), stearic acid (C18), isostearic acid (C18), arachidic acid (C20), and behenic acid (C22), as well as unsaturated fatty acids such as oleic acid (18:1(n-9)) and linoleic acid (18:2(n-6)). Other examples include fatty acids derived from plants and animals, such as coconut oil fatty acids, palm kernel oil fatty acids, rice bran oil fatty acids, and beef tallow fatty acids.

The monohydric to trihydric alcohols that make up component A1 are not particularly limited, but are preferably straight-chain or branched-chain alcohols with 2 to 20 carbon atoms. The number of carbon atoms in the alcohol is preferably 3 to 18, and more preferably 3 to 10.

Examples of the alcohol include monohydric alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, 2-butanol, isobutyl alcohol, t-butanol, pentanol, 2-pentanol, isopentanol, neopentanol, t-pentanol, n-hexanol, 2-hexanol, isohexanol, ethylhexanol, and octyldodecanol; dihydric alcohols such as 1,2-propanediol, 1,3-propanediol, ethylene glycol, butanediol, hexanediol, and pentanediol; and trihydric alcohols such as glycerin.

Component A1 is not particularly limited, but examples thereof include methyl laurate, ethyl laurate, propyl laurate, isopropyl laurate, butyl laurate, isobutyl laurate, methyl myristate, ethyl myristate, propyl myristate, isopropyl myristate, butyl myristate, isobutyl myristate, cetyl myristate, myristyl myristate, octyldodecyl myristate, methyl palmitate, ethyl palmitate, propyl palmitate, isopropyl palmitate, butyl palmitate, isobutyl palmitate, cetyl palmitate, ethylhexyl palmitate, methyl stearate, ethyl stearate, Examples include propyl stearate, isopropyl stearate, butyl stearate, isobutyl stearate, methyl oleate, ethyl oleate, propyl oleate, isopropyl oleate, butyl oleate, isobutyl oleate, decyl oleate, ethylhexyl stearate, isopropyl isostearate, 2-hexyldecyl isostearate, cetyl 2-ethylhexanoate, isononyl isononanoate, ethyl linoleate, C12-15 alkyl benzoate, glyceryl tri-2-ethylhexanoate, caprylic/capric triglyceride, and caprylic/capric/myristic/stearic triglyceride. Of these, ethylhexyl palmitate is preferred.

The content of component A1 in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 20 to 80% by mass, more preferably 30 to 70% by mass, and even more preferably 35 to 65% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. A content of 20% by mass or more provides a superior cleansing effect. A content of 80% by mass or less provides superior storage stability. The content of component A1 above is the total content of all components A1 in the oil-based cosmetic of the present invention.

(Component A2)
Component A2 is an ester of a fatty acid having 8 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, and is an ester in which the number of bonds of the fatty acid is 7 to 15.

The fatty acids that make up component A2 have 8 to 22 carbon atoms. From the standpoint of being able to appropriately increase the viscosity of the oil-based cosmetic and providing superior storage stability, fatty acids with 12 to 20 carbon atoms are preferred, and fatty acids with 14 to 20 carbon atoms are more preferred.

The number of bonds of the fatty acid in component A2 is 7 to 15, and from the viewpoint of superior storage stability, it is preferably 8 to 12.

The average degree of polymerization of the polyglycerin that constitutes component A2 is 5 to 15, and from the standpoint of being able to appropriately increase the viscosity of the oil-based cosmetic and achieving superior storage stability, it is preferably 6 to 14, and more preferably 8 to 12.

Component A2 is not particularly limited, but examples include polyglyceryl decaisostearate and decaglyceryl decaoleate. Of these, polyglyceryl decaisostearate is preferred.

The content of component A2 in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 2 to 10% by mass, more preferably 3 to 8% by mass, and even more preferably 4 to 7% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. When the content is within the above range, the viscosity of the oil-based cosmetic can be appropriately increased and the storage stability is superior. The content of component A2 above is the total content of all components A2 in the oil-based cosmetic of the present invention.

Component A may contain an ester oil other than components A1 and A2. In this specification, these other ester oils may be referred to as "component A3." Examples of component A3 include, but are not limited to, polyvalent fatty acid esters such as diisopropyl adipate, diethylhexyl sebacate, diethylpentanediol dineopentanoate, isodecyl neopentanoate, and diisostearyl malate; pentaerythrityl tetraethylhexanoate, pentaerythrityl tetraoctanoate, pentaerythrityl tetraisostearate, erythrityl triethylhexanoate, 2-ethylhexyl hydroxystearate, dipentaerythrityl hexa(hydroxystearate/stearic acid/rosin acid), dipentaerythrityl tetra(hydroxystearate/isostearate), dipentaerythrityl hexahydroxystearate, and dipentaerythrityl hexa(behenate/benzoate/ethylhexanoate). Component A3 may be used alone or in combination of two or more types.

From the perspective of achieving a more excellent cleansing effect, component A3 preferably contains a polyvalent fatty acid ester, and particularly preferably contains diisopropyl adipate.

The content of component A3 in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 0.5 to 8% by mass, and more preferably 1.0 to 5% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. When the content is 0.5% by mass or more, the cleansing effect is even more excellent. At a content of 8% by mass, the cleansing effect reaches its peak. The content of component A3 is the total content of all components A3 in the oil-based cosmetic of the present invention.

The content of Component A in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 30 to 85% by mass, more preferably 35 to 75% by mass, and even more preferably 40 to 70% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. A content of 30% by mass or more provides a superior cleansing effect. A content of 85% by mass or less provides superior storage stability. The content of Component A above is the total content of all components A in the oil-based cosmetic of the present invention.

[Component B]
Component B is a nonionic surfactant containing at least Component B1, Component B2, and Component B3. Component B1, Component B2, and Component B3 may each be used singly or in combination. By using a combination of Components B1 to B3 as a nonionic surfactant, the viscosity of the oil-based cosmetic can be appropriately adjusted and excellent storage stability can be achieved.

(Component B1)
Component B1 is a nonionic surfactant that is an ester of a fatty acid having 8 to 14 carbon atoms and a polyglycerol having an average degree of polymerization of 3 to 10, and in which the number of fatty acid bonds is 1 to 5. Only one type of component B1 may be used, or two or more types may be used.

The number of carbon atoms in the fatty acid that constitutes component B1 is 8 to 14, and preferably 8 to 12, from the viewpoints of being able to appropriately increase the viscosity of the oil-based cosmetic and achieving superior storage stability.

The average degree of polymerization of the polyglycerin that constitutes component B1 is 3 to 10, and is preferably 4 to 8 from the viewpoints of being able to appropriately increase the viscosity of the oil-based cosmetic and achieving superior storage stability.

The number of bonds of the fatty acid in component B1 is 1 to 5, and is preferably 2 to 3 from the viewpoints of being able to appropriately increase the viscosity of the oil-based cosmetic and achieving superior storage stability.

Component B1 is not particularly limited, but examples include polyglyceryl monolaurate, polyglyceryl monomyristate, and polyglyceryl dicaprate. Of these, polyglyceryl dicaprate is preferred.

The content of component B1 in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 2.0 to 10.0% by mass, and more preferably 3.0 to 8.0% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. Having the content within the above range provides superior storage stability. The content of component B1 above is the total content of all components B1 in the oil-based cosmetic of the present invention.

(Component B2)
Component B2 is a nonionic surfactant that is an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, and in which the number of fatty acid bonds is 4 to 6. Only one type of component B2 may be used, or two or more types may be used.

The number of carbon atoms in the fatty acid that makes up component B2 is 16 to 22, and preferably 16 to 20, from the viewpoints of being able to appropriately increase the viscosity of the oil-based cosmetic and achieving superior storage stability.

The average degree of polymerization of the polyglycerin that constitutes component B2 is 5 to 15, and from the viewpoints of being able to appropriately increase the viscosity of the oil-based cosmetic and achieving superior storage stability, it is preferably 6 to 14, and more preferably 8 to 12.

Component B2 is not particularly limited, but examples include polyglyceryl pentaoleate and polyglyceryl pentastearate. Of these, polyglyceryl pentaoleate is preferred.

The content of component B2 in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 0.5 to 5.0% by mass, more preferably 0.8 to 4.0% by mass, and even more preferably 1.0 to 2.5% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. Having the content within the above range provides superior storage stability. The content of component B2 above is the total content of all components B2 in the oil-based cosmetic of the present invention.

(Component B3)
Component B3 is a nonionic surfactant that is an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, and in which the number of bonds between the fatty acids is 1 to 3. Component B3 has excellent compatibility with Component A, and by incorporating Component B3, the cleansing effect and storage stability of oil-based cosmetics can be improved. Only one type of Component B3 may be used, or two or more types may be used.

The number of carbon atoms in the fatty acid that makes up component B3 is 16 to 22, and preferably 16 to 20, from the viewpoints of being able to appropriately increase the viscosity of the oil-based cosmetic and achieving superior storage stability.

The average degree of polymerization of the polyglycerin that constitutes component B3 is 5 to 15, and from the viewpoints of being able to appropriately increase the viscosity of the oil-based cosmetic and achieving superior storage stability, it is preferably 6 to 14, and more preferably 8 to 12.

Component B3 is not particularly limited, but examples include polyglyceryl monostearate, polyglyceryl monooleate, polyglyceryl distearate, polyglyceryl diisostearate, polyglyceryl dioleate, polyglyceryl tristearate, and polyglyceryl trioleate. Of these, polyglyceryl dioleate is preferred.

The content of component B3 in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 10 to 40% by mass, and more preferably 15 to 32% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. Having the content within the above range provides superior storage stability. The content of component B3 above is the total content of all components B3 in the oil-based cosmetic of the present invention.

The mass ratio of the content of component B3 to the content of component B1 [B3/B1] is 2.0 to 10.0, preferably 2.0 to 7.0, and more preferably 2.5 to 5.5.

The total content of components B1, B2, and B3 is 20.0 to 50.0% by mass, preferably 22.0 to 40.0% by mass, and more preferably 24.0 to 36.0% by mass.

Component B may contain other nonionic surfactants in addition to components B1, B2, and B3. However, the total content of components B1, B2, and B3 in component B is preferably 70% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, and particularly preferably 95% by mass or more, based on 100% by mass of the total amount of component B.

The mass ratio of the content of component A to the content of component B [component A/component B] is not particularly limited, but is preferably 1.0 to 3.0, and more preferably 1.2 to 2.5. Having this mass ratio within this range results in better storage stability.

[Component C]
Component C is a polyhydric alcohol. When Component C is added, storage stability at low temperatures is improved. Component C may be used alone or in combination of two or more types.

Examples of component C include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, 1,2-pentanediol (pentylene glycol), 1,2-hexanediol, 1,2-octanediol (caprylyl glycol), 1,2-decanediol, concentrated glycerin, diglycerin, and polyglycerin.

The content of component C in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 4.0 to 15.0% by mass, more preferably 6.0 to 13.0% by mass, and even more preferably 8.0 to 11.0% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. When the content falls within the above range, the storage stability is superior. The content of component C above is the total content of all components C in the oil-based cosmetic of the present invention.

[Component D]
Component D is a higher alcohol. When Component D is added, storage stability at low temperatures is further improved. Component D may be used alone or in combination of two or more types.

Examples of Component D include cetyl alcohol, stearyl alcohol, isostearyl alcohol, myristyl alcohol, hexyldecanol, 2-octyldodecanol, oleyl alcohol, and behenyl alcohol.

Component D also includes higher alcohols having an alicyclic ring, such as sterols. Examples of sterols include animal sterols and plant sterols (phytosterols). Examples of animal sterols include cholesterol, cholestanol, and 7-dehydrocholesterol. Examples of plant sterols include sitosterol, stigmasterol, fucosterol, spinasterol, and brassicasterol.

The content of component D in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 0.1 to 3.0% by mass, and more preferably 0.5 to 1.5% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. Having the content within the above range provides superior storage stability. The content of component D above is the total content of all components D in the oil-based cosmetic of the present invention.

[Other ingredients]
The oily cosmetic of the present invention may further contain other components in addition to the above-mentioned components A to D. The other components are not particularly limited, but examples include other oily components other than components A and D, surfactants other than component B (cationic surfactants, anionic surfactants, amphoteric surfactants, etc.), lower alcohols, ultraviolet absorbers, powders, antioxidants, preservatives, fragrances, colorants, chelating agents, cooling agents, thickeners, vitamins, neutralizing agents, amino acids, pH adjusters, whitening agents, anti-inflammatory agents, deodorants, animal and plant extracts, and additives such as sequestering agents. Only one of the above-mentioned other components may be used, or two or more may be used.

The other oily components include vegetable oils, silicone oils, hydrocarbon oils, waxes, and higher fatty acids. Of the other oily components, hydrocarbon oils are preferred from the viewpoint of superior cleansing effects. One or more of the other oily components may be used.

Examples of the vegetable oils include macadamia nut oil, eucalyptus oil, coconut oil, avocado oil, safflower oil, olive oil, palm oil, palm kernel oil, kukui nut oil, shea butter, cocoa butter, almond oil, sunflower oil, rosehip oil, olive squalane, camellia oil, kiwi fruit seed oil, camellia oil, apricot kernel oil, sesame oil, soybean oil, jojoba oil, castor oil, hazelnut oil, meadowfoam oil, peppermint oil, argan oil, carrot oil, lavender oil, sugar squalane, damask rose flower wax, rosa centifolia flower wax, jasmine flower wax, camellia oil, and hydrogenated versions of these oils (e.g., hydrogenated castor oil, hydrogenated jojoba oil, hydrogenated palm oil, hydrogenated avocado oil, hydrogenated soybean oil, etc.).

The silicone oil is not particularly limited, but examples include dimethyl silicone oils such as methylpolysiloxane and highly polymerized methylpolysiloxane; methylphenyl silicone oils such as methylphenylpolysiloxane; cyclic silicone oils such as methylcyclopolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; amino-modified silicones such as aminopropylmethylsiloxane-dimethylsiloxane copolymer, aminoethylaminopropylsiloxane-dimethylsiloxane copolymer, and aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer; modified silicones such as carboxy-modified silicone, fatty acid-modified silicone, alcohol-modified silicone, aliphatic alcohol-modified silicone, epoxy-modified silicone, fluorine-modified silicone, and alkyl-modified silicone; methylhydrogenpolysiloxane, dimethiconol, etc.

Examples of the hydrocarbon oils include α-olefin oligomers, petrolatum, isoparaffin, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid isoparaffin, liquid paraffin, hydrogenated polyisobutene, hydrogenated (tetradecenyl/methylpentadecene), isododecane, etc.

Examples of the above waxes include carnauba wax, candelilla wax, beeswax, rice bran wax, shellac wax, spermaceti, lanolin, and sunflower seed wax.

Examples of the above-mentioned higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, and oleic acid.

The content of the other oily components (particularly hydrocarbon oils) is not particularly limited, but is preferably 20% by mass or less (e.g., 1 to 20% by mass), and more preferably 15% by mass or less (e.g., 5 to 15% by mass), relative to 100% by mass of the total amount of the oil-based cosmetic composition of the present invention. When the content is 1% by mass or more, the cleansing effect is superior. When the content is 20% by mass or less, the storage stability is superior.

The content of the oily component (component A and the other oily components described above) in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 30 to 85% by mass, more preferably 35 to 75% by mass, and even more preferably 40 to 70% by mass, relative to 100% by mass of the total amount of the oil-based cosmetic of the present invention. A content of 30% by mass or more provides a superior cleansing effect. A content of 85% by mass or less provides superior storage stability.

The content of Component B in the oil-based cosmetic of the present invention is not particularly limited, but is preferably 70% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, and particularly preferably 95% by mass or more, relative to 100% by mass of the total amount of surfactants in the oil-based cosmetic of the present invention.

The viscosity of the oil-based cosmetic of the present invention is not particularly limited, but for example, the viscosity at 25°C is preferably 1300 to 6000 mPa·s, more preferably 1500 to 4000 mPa·s, and even more preferably 2000 to 3500 mPa·s. Viscosity measurements are performed using a B-type viscometer, selecting a rotor appropriate for the viscosity, and operating at a rotation speed of 30 r/min. If the viscosity is 1300 mPa·s or higher, the oil-based cosmetic is less likely to drip when applied, providing excellent operability. If the viscosity is 6000 mPa·s or lower, the oil-based cosmetic is easy to use.

The oil-based cosmetic of the present invention can be produced by conventional methods. For example, it can be produced by mixing the above-mentioned components and stirring them using a known method, such as a homomixer.

The oil-based cosmetic of the present invention is preferably a skin cosmetic that is primarily used for application to the skin. The oil-based cosmetic of the present invention is used, for example, as cosmetics, quasi-drugs, pharmaceuticals, miscellaneous goods, etc. The areas to which the oil-based cosmetic of the present invention is applied are not particularly limited, but examples include the face (forehead, eyes, corners of the eyes, cheeks, mouth, etc.) and the body (arms, elbows, back of the hands, fingertips, feet, knees, heels, neck, armpits, back, etc.). Of these, the face is particularly preferred.

The oil-based cosmetic of the present invention is preferably a cleansing cosmetic used for the purpose of removing makeup. The oil-based cosmetic of the present invention can provide excellent cleansing effects and can be made to have a viscosity that prevents dripping even when applied to eyelashes. Therefore, it is preferably a cleansing cosmetic (mascara remover, eye makeup remover, lip remover, etc.) for point makeup (mascara, eyeliner, eyeshadow, lipstick, etc.), and is particularly preferably a mascara remover.

The formulation of the oil-based cosmetic of the present invention is not particularly limited, but examples include a variety of formulations such as lotion, cream, gel, emulsion, aerosol spray, natural spray, stick, powder, roll-on, and sheet (paper).

The oil-based cosmetic of the present invention is filled into a container and used as an oil-based cosmetic product. The oil-based cosmetic product comprises a container capable of dispensing its contents and the oil-based cosmetic of the present invention filled in the container. The container preferably comprises an oil-based cosmetic filling section and a comb section. The comb section preferably has a discharge port for discharging the oil-based cosmetic supplied from the oil-based cosmetic filling section. Such a container can discharge the oil-based cosmetic filled in the oil-based cosmetic filling section from the discharge port via a supply channel within the comb section connected to the oil-based cosmetic filling section, for example, by applying pressure from the outside of the oil-based cosmetic filling section. The oil-based cosmetic can then be applied while combing the eyelashes with the comb section. The viscosity of the oil-based cosmetic of the present invention can be adjusted appropriately, for example, to a high viscosity to prevent dripping during application, and has excellent storage stability. For this reason, the oil-based cosmetic of the present invention is particularly preferably used as an oil-based cosmetic product equipped with a container having the comb section.

The oil-based cosmetic of the present invention uses, as the oil agent, an ester oil (component A) containing an ester of a monovalent higher fatty acid and a mono- to trivalent alcohol (component A1) and an ester (A2) of an ester of a fatty acid having 8 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, where the number of fatty acid bonds is 7 to 15; and, as nonionic surfactants (component B), a combination of an ester of a fatty acid having 8 to 14 carbon atoms and a polyglycerol having an average degree of polymerization of 3 to 10, where the number of fatty acid bonds is 1 to 5 (component B1), an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, where the number of fatty acid bonds is 4 to 6 (component B2), and an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, where the number of fatty acid bonds is 1 to 3 (component B3); and an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, where the number of fatty acid bonds is 1 to 3 (component C3). An important feature of the cosmetic is the incorporation of a polyhydric alcohol (component C). This makes it possible to increase the viscosity of the oil-based cosmetic, for example, while still providing excellent storage stability, particularly at low temperatures. Furthermore, when the oil-based cosmetic of the present invention is used as a cleansing cosmetic, its high viscosity makes it less likely to drip and provides excellent application properties, making it particularly suitable for use as a cleansing cosmetic for point makeup.

The present invention will be explained in more detail below based on examples, but the present invention is not limited to these examples. The amounts listed in the tables are the amounts of each ingredient (i.e., the amount of active ingredient in each raw material; so-called pure content), and are expressed in "% by mass" unless otherwise specified.

Examples 1 to 8, Comparative Examples 1 to 13
Using the components shown in the table, each oily cosmetic composition of the Examples and Comparative Examples was prepared by a conventional method.

(evaluation)
The oily cosmetics obtained in the Examples and Comparative Examples were evaluated as follows, and the evaluation results are shown in the table below.

(1) Stability Test The appearance of the oil-based cosmetic preparations of each Example and Comparative Example was visually observed immediately after preparation, the day after preparation, and two weeks later. The storage temperatures are as shown in the table. The stability was evaluated according to the following evaluation criteria. Only oil-based cosmetics that received an evaluation result of C or higher the day after preparation were subjected to viscosity measurement at 25°C and observation two weeks later.
<Stability evaluation criteria>
A: Transparent and homogeneous state B: At least some crystallization is observed, but the liquid becomes transparent when returned to 25°C C: Partially cloudy and semi-transparent state D: Cloudy and opaque state E: Clearly separated state

(2) Viscosity at 25°C The viscosity of the oil-based cosmetic preparations of each Example and Comparative Example was measured using a B-type viscometer (product name "TVB-25L", manufactured by Toki Sangyo Co., Ltd.) with rotor No. 3 at 25°C and 30 rpm.

(3) Cleansing Power 0.02 g of commercially available mascara was applied to the surface of artificial skin (product name "Bioskin Plate", white, manufactured by Beaulux Co., Ltd.) (approximately 1.5 cm x 1.5 cm). 1 g of the oil-based cosmetic of each Example was placed on top so as to completely cover the applied mascara. After leaving it to stand for 1 minute, the surface was wiped off 10 times with cotton, and the amount of remaining mascara was visually observed and evaluated according to the following evaluation criteria.
<Criteria for evaluating cleansing power>
A: Less than 20% of the mascara remained, and the cleansing power was excellent. B: Approximately 20% to 50% of the mascara remained, and the cleansing power was sufficient. C: More than 50% of the mascara remained, and the cleansing power was poor.

The oil-based cosmetics of the present invention (Examples) were evaluated as having excellent storage stability and cleansing power, despite having a viscosity of 1,300 to 6,000 mPa·s. On the other hand, when the total content of components B1 to B3 was low, when the mass ratio [B3/B1] was high, when component B2 was not included, or when component B3 was not included, the cosmetics were evaluated as having poor storage stability (Comparative Examples).

Furthermore, Table 2 shows formulation examples of oily cosmetics of the present invention.

Claims (3)

Contains the following component A, the following component B, and the following component C,
the mass ratio [B3/B1] of the content of component B3 to the content of component B1 is 2.0 to 10.0;
The oil-based cosmetic preparation has a total content of Component B1, Component B2, and Component B3 of 20.0 to 50.0% by mass.
Component A: an ester oil comprising the following components A1 and A2; Component A1: an ester of a monovalent saturated or unsaturated fatty acid having 6 or more carbon atoms and a mono- to trihydric alcohol; Component A2: an ester of a fatty acid having 8 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, wherein the number of fatty acid bonds is 7 to 15; Component B: a nonionic surfactant comprising the following components B1, B2, and B3; Component B1: an ester of a fatty acid having 8 to 14 carbon atoms and a polyglycerol having an average degree of polymerization of 3 to 10, wherein the number of fatty acid bonds is 1 to 5; Component B2: an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, wherein the number of fatty acid bonds is 4 to 6; Component B3: an ester of a fatty acid having 16 to 22 carbon atoms and a polyglycerol having an average degree of polymerization of 5 to 15, wherein the number of fatty acid bonds is 1 to 3; Component C: a polyhydric alcohol The oily cosmetic according to claim 1, further comprising the following component D:
Component D: higher alcohol The oil-based cosmetic preparation according to claim 1 or 2, wherein the content of component B2 is 0.5 to 5.0% by mass.